KR20160127606A - Mobile terminal and the control method thereof - Google Patents

Abstract

Disclosed are a mobile terminal and a method for controlling the same. The mobile terminal comprises: a light emitting unit; a camera; an illuminance sensor which measures an illuminance value by using light emitted from the light emitting unit; and a controlling unit which obtains a plurality of image frames for one scene from the camera by using the emitted light, and generates a high dynamic range (HDR) image by using at least one among the obtained image frames. The controlling unit obtains the image frames by differently applying at least one of an exposure value or a gain to the scene depending on the measured illuminance value.

Description

[0001] MOBILE TERMINAL AND THE CONTROL METHOD THEREOF [0002]

The present invention relates to a mobile terminal and a control method thereof, and more particularly, to a mobile terminal for generating an HDR (High Dynamic Range) image and a control method thereof.

A terminal can be divided into a mobile terminal (mobile / portable terminal) and a stationary terminal according to whether the terminal can be moved. The mobile terminal can be divided into a handheld terminal and a vehicle mounted terminal according to whether the user can directly carry the mobile terminal.

The functions of mobile terminals are diversified. For example, there are data and voice communication, photographing and video shooting through a camera, voice recording, music file playback through a speaker system, and outputting an image or video on a display unit. Some terminals are equipped with an electronic game play function or a multimedia player function. In particular, modern mobile terminals can receive multicast signals that provide visual content such as broadcast and video or television programs.

Such a terminal has various functions, for example, in the form of a multimedia device having multiple functions such as photographing and photographing of a moving picture, reproduction of a music or video file, reception of a game and broadcasting, etc. .

In order to support and enhance the function of such a terminal, it is considered to improve the structural part and / or the software part of the terminal, and in particular, the function of photographing or moving picture photographing among the functions of the terminal is becoming high performance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned needs, and an object of the present invention is to provide a mobile terminal for generating a high dynamic range (HDR) image by using a plurality of image frames according to flash emission, And to provide a control method thereof.

According to an aspect of the present invention, there is provided a mobile terminal including a light emitting unit, a camera, an illuminance sensor for measuring an illuminance value using light emitted from a light emitting unit, And a control unit for acquiring a plurality of image frames for one scene and generating one HDR image using at least one of the acquired plurality of image frames, A plurality of image frames are obtained by applying at least one of an exposure value (Exposure Value) and a gain (Gain) according to the measured illuminance value.

Also, the controller increases at least one of the increase of the exposure value or the increase of the gain as the difference between the measured illuminance value and the preset value decreases, and as the difference between the measured illuminance value and the preset value increases, At least one can be reduced.

The controller calculates a brightness value of each of the plurality of images according to the measured illuminance value to obtain a first brightness value before light emission and a second brightness value corresponding to light emission, It is possible to apply at least one of the increase of the exposure value or the increase of the gain by comparing the brightness values.

Also, the controller may increase at least one of an increase of the exposure value or an increase of the gain as the difference between the ratio of the first brightness value to the second brightness value and the preset value increases, and the ratio of the first brightness value to the second brightness value increases As the value is smaller than the preset value, at least one of the increase of the exposure value or the increase of the gain may be reduced.

The controller acquires the first image frame before the light emission and the second image frame corresponding to the light emission, and obtains the difference between the average value of the brightness values for the second image frame and the average values of the brightness values for the first image frame The increase of the exposure value or the increase of the gain is increased as the difference between the average values of the brightness values of the first image frame and the second image frame increases, One can be reduced.

In addition, if it is determined that a face of a person is not included in one scene, the control unit may increase at least one of the increase of the exposure value or the increase of the gain. If it is determined that the face of the person is included in one scene, The increase of at least one of the increase and decrease can be reduced.

Also, when the measured illumination value is less than 500 [Lx], the control unit obtains a darker image frame than the predetermined basic image frame by decreasing the exposure value and the gain, respectively, Can be obtained.

Also, when the measured illumination value is less than 500 [Lx] and less than 1500 [Lx], the control unit obtains a darker image frame than the predetermined basic image frame by decreasing only the exposure value, Frame can be obtained.

Also, when the measured illumination value is 1500 [Lx] or more, the control unit obtains a darker image frame than the predetermined basic image frame by reducing only the exposure value, decreases the exposure value, and increases the gain, Can be obtained.

The control unit may control the light emitting unit to perform the second light emission to form the first light emission and the illumination value corresponding to at least one of the determined exposure value or the determined gain to determine at least one of the exposure value and the gain, The illuminance value can be controlled to be an average value of the illuminance values according to the first light emission.

If it is determined that there is motion as a result of performing the first light emission, the control unit decreases the exposure value and increases the gain. If it is determined that there is no motion as a result of performing the first light emission, And the gain can be reduced.

The plurality of image frames each include a first area, which is an area including one subject, and a second area, which is a remaining area excluding the first area. The controller controls the illuminance before the first light emission, If the difference between the values is within the preset range, the first region and the second region may extract and combine the image according to the second light emission and the image before the first light emission, respectively, to generate one HDR image.

The plurality of image frames each include a first area, which is an area including one subject, and a second area, which is a remaining area excluding the first area. The controller controls the illuminance before the first light emission, The first region and the second region may extract and synthesize an image according to the first light emission and an image according to the second light emission, respectively, to generate one HDR image.

Further, the control unit may be configured to start at the same time as the initial light emission for determining at least one of the exposure value and the gain, the post light emission for forming the illumination value corresponding to at least one of the determined exposure value or the determined gain, and the end of the initial light emission, Controlling the light emitting section to perform at least one intermediate light emission for forming an illuminance value between the value and the illuminance value according to the last light emission and acquiring a plurality of image frames according to each of the initial light emission, Thus, one HDR image can be generated using at least one of the plurality of acquired image frames.

The control unit measures an average value of brightness values of at least one region of each of the plurality of acquired image frames and uses at least one of the remaining image frames except an image frame whose average value of the brightness values is out of a predetermined brightness value range One HDR image can be generated.

In addition, the controller extracts at least one of the image frames excluding the image frame whose B value is out of the preset value among the brightness values of the plurality of acquired image frames, and if the B value for each of the remaining image frames is equal to And one HDR image may be generated using at least one of the reduced image frames.

In addition, the controller may determine whether or not two or more of the remaining image frames are moving, and may perform alignment for each of the two or more image frames if motion is determined.

Also, the controller converts an average value of the brightness values for each of the two or more image frames to a predetermined value, calculates an average value of the brightness values for each of the two or more image frames with respect to the same pixel block, It can be determined that a motion has occurred.

Meanwhile, the mobile terminal according to another embodiment of the present invention may acquire a plurality of images for one scene from a camera, an illuminance sensor for measuring an illuminance value and a camera, and use at least one of the acquired images And a control unit for generating one high dynamic range (HDR) image, wherein the control unit applies at least one of an exposure value and a gain to a plurality of scenes according to a measured illuminance value, .

Meanwhile, a method of controlling a mobile terminal according to an exemplary embodiment of the present invention includes the steps of measuring illuminance values using light emitted from a light emitting unit, displaying a plurality of image frames for one scene using the emitted light, And generating one HDR image using at least one of the plurality of acquired image frames, wherein the step of acquiring a plurality of image frames comprises the steps of: And acquires a plurality of image frames by applying at least one of an exposure value (Exposure Value) or a gain (Gain) according to the illuminance value.

According to at least one of the embodiments of the present invention, since different exposure values or gains are applied according to the current illumination value, a plurality of adaptive candidate image frames can be generated.

In addition, according to at least one embodiment of the present invention, one HDR image is generated from a plurality of adaptive candidate image frames, so that the image quality of the HDR image is clear despite the influence of the flash.

Further scope of applicability of the present invention will become apparent from the following detailed description. It should be understood, however, that the detailed description and specific examples, such as the preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art.

1A is a block diagram of a mobile terminal according to an embodiment of the present invention,
1B to 1C are views illustrating a concept of a mobile terminal according to an embodiment of the present invention,
2 is a view for explaining a problem of a photographed image by a conventional mobile terminal,
3 is a flowchart illustrating a method of controlling a mobile terminal according to an exemplary embodiment of the present invention.
4 is a flowchart illustrating a control method of a mobile terminal according to another embodiment of the present invention,
5 is a diagram illustrating an example of a relationship between an exposure value (Exposure Value) and a gain (gain) according to the brightness of an image,
6 to 8 are views illustrating various examples of drawings for explaining modes of light emission according to a mobile terminal according to an embodiment of the present invention,
9 to 17 are views illustrating various examples of the drawings for explaining setting of the brightness adjustment value according to the mobile terminal according to the embodiment of the present invention,
18 to 25 are various examples of drawings for explaining synthesis of input images whose brightness values are adjusted according to a mobile terminal according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

The use of the terms "comprising" or "having" in this application is intended to specify the presence of stated features, integers, steps, operations, elements, parts, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof.

The mobile terminal described in this specification includes a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation device, a slate PC A tablet PC, an ultrabook, a wearable device such as a smartwatch, a smart glass, and a head mounted display (HMD). have.

However, it will be readily apparent to those skilled in the art that the configuration according to the embodiments described herein may be applied to fixed terminals such as a digital TV, a desktop computer, a digital signage, and the like, .

1A is an example of a block diagram of a mobile terminal 100 according to an embodiment of the present invention. 1A, a mobile terminal 100 includes a wireless communication unit 110, an input unit 120, a sensing unit 140, an output unit 150, an interface unit 160, a memory 170, a controller 180, And a power supply unit 190 and the like. The components shown in FIG. 1A are not essential for implementing a mobile terminal, so that the mobile terminal described herein can have more or fewer components than the components listed above.

More specifically, the wireless communication unit 110 of the wireless communication unit 110 may communicate with the mobile terminal 100 and the wireless communication system, between the mobile terminal 100 and another mobile terminal 100, or between the mobile terminal 100 and the external server, And may include one or more modules to enable communication. The wireless communication unit 110 may include one or more modules for connecting the mobile terminal 100 to one or more networks.

The wireless communication unit 110 may include at least one of a broadcast receiving module 111, a mobile communication module 112, a wireless Internet module 113, a short distance communication module 114, and a location information module 115.

The input unit 120 includes a camera 121 or an image input unit for inputting a video signal, a microphone 122 or an audio input unit for inputting an audio signal, a user input unit 123 for receiving information from a user, A touch key, a mechanical key, and the like). The voice data or image data collected by the input unit 120 may be analyzed and processed by a user's control command.

The sensing unit 140 may include at least one sensor for sensing at least one of information in the mobile terminal, surrounding environment information surrounding the mobile terminal, and user information. For example, the sensing unit 140 may include a proximity sensor 141, an illumination sensor 142, a touch sensor, an acceleration sensor, a magnetic sensor, a gravity sensor A G-sensor, a gyroscope sensor, a motion sensor, an RGB sensor, an infrared sensor, a finger scan sensor, an ultrasonic sensor, A microphone, a battery gauge, an environmental sensor (e.g., a barometer, a hygrometer, a thermometer, a radiation detection sensor, a heat sensor) A sensor, a gas sensor, etc.), a chemical sensor (e.g., an electronic nose, a healthcare sensor, a biometric sensor, etc.). Meanwhile, the mobile terminal disclosed in the present specification can combine and utilize information sensed by at least two of the sensors.

The output unit 150 includes at least one of a display unit 151, an acoustic output unit 152, a haptic tip module 153, and a light output unit 154 to generate an output related to visual, auditory, can do. The display unit 151 may have a mutual layer structure with the touch sensor or may be integrally formed to realize a touch screen. The touch screen may function as a user input unit 123 for providing an input interface between the mobile terminal 100 and a user and may provide an output interface between the mobile terminal 100 and a user.

The interface unit 160 serves as a path to various types of external devices connected to the mobile terminal 100. The interface unit 160 includes a port for connecting a device equipped with a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, a video input / output port, an audio input / output port, a video input / output port, and an earphone port. In the mobile terminal 100, corresponding to the connection of the external device to the interface unit 160, it is possible to perform appropriate control related to the connected external device.

In addition, the memory 170 stores data supporting various functions of the mobile terminal 100. The memory 170 may store a plurality of application programs or applications running on the mobile terminal 100, data for operation of the mobile terminal 100, and commands. At least some of these applications may be downloaded from an external server via wireless communication. Also, at least some of these application programs may exist on the mobile terminal 100 from the time of shipment for the basic functions (e.g., call incoming, outgoing, message reception, and origination functions) of the mobile terminal 100. Meanwhile, the application program may be stored in the memory 170, installed on the mobile terminal 100, and may be operated by the control unit 180 to perform the operation (or function) of the mobile terminal.

In addition to the operations associated with the application program, the control unit 180 typically controls the overall operation of the mobile terminal 100. The control unit 180 may process or process signals, data, information, and the like input or output through the above-mentioned components, or may drive an application program stored in the memory 170 to provide or process appropriate information or functions to the user.

In addition, the controller 180 may control at least some of the components illustrated in FIG. 1A to drive an application program stored in the memory 170. FIG. Further, the control unit 180 may operate at least two or more of the components included in the mobile terminal 100 in combination with each other for driving the application program.

The power supply unit 190 receives external power and internal power under the control of the controller 180 and supplies power to the components included in the mobile terminal 100. The power supply unit 190 may include a battery, and the battery may be an internal battery or a replaceable battery.

At least some of the components may operate in cooperation with each other to implement a method of operation, control, or control of the mobile terminal according to various embodiments described below. The method of operation, control, or control of the mobile terminal may also be implemented on the mobile terminal by driving at least one application program stored in the memory 170.

Hereinafter, the various components of the mobile terminal 100 will be described in detail with reference to FIG. 1A.

First, referring to the wireless communication unit 110, the broadcast receiving module 111 of the wireless communication unit 110 receives broadcast signals and / or broadcast-related information from an external broadcast management server through a broadcast channel. The broadcast channel may include a satellite channel and a terrestrial channel. More than one broadcast receiving module may be provided to the mobile terminal 100 for simultaneous broadcast reception or broadcast channel switching for at least two broadcast channels.

The mobile communication module 112 may be a mobile communication module such as a mobile communication module, a mobile communication module, a mobile communication module, a mobile communication module, a mobile communication module, (Wideband CDMA), HSDPA (High Speed Downlink Packet Access), HSUPA (High Speed Uplink Packet Access), LTE (Long Term Evolution), LTE-A (Enhanced Voice-Data Optimized or Enhanced Voice-Data Only) Long Term Evolution-Advanced), and the like, to a base station, an external terminal, and a server.

The wireless signal may include various types of data depending on a voice call signal, a video call signal, or a text / multimedia message transmission / reception.

The wireless Internet module 113 is a module for wireless Internet access, and may be built in or externally attached to the mobile terminal 100. The wireless Internet module 113 is configured to transmit and receive a wireless signal in a communication network according to wireless Internet technologies.

Wireless Internet technologies include, for example, WLAN (Wireless LAN), Wi-Fi (Wireless Fidelity), Wi-Fi (Wireless Fidelity) Direct, DLNA (Digital Living Network Alliance), WiBro for example, a wireless Internet module 113, a wireless LAN module 113, a wireless LAN module 113, a wireless LAN module 113, a wireless LAN module 113, Transmits and receives data according to at least one wireless Internet technology, including Internet technologies not listed above.

The wireless Internet module 113 for performing a wireless Internet connection through a mobile communication network, from the viewpoint that wireless Internet access by WiBro, HSDPA, HSUPA, GSM, CDMA, WCDMA, LTE, LTE- And may be understood as a kind of mobile communication module 112.

The short-range communication module 114 is for short-range communication, and includes Bluetooth ™, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB) (Near Field Communication), Wi-Fi (Wireless-Fidelity), Wi-Fi Direct, and Wireless USB (Wireless Universal Serial Bus) technology. The short-range communication module 114 is connected to the mobile terminal 100 and the wireless communication system through the wireless area networks, between the mobile terminal 100 and another mobile terminal 100, And can support wireless communication between networks where other mobile terminals (100, or external servers) are located. The short-range wireless communication network may be a short-range wireless personal area network.

Here, the other mobile terminal 100 may be a wearable device (e.g., a smartwatch, a smart smart, etc.) capable of exchanging data with the mobile terminal 100 according to the present invention glass, HMD (head mounted display)). The short range communication module 114 may detect (or recognize) a wearable device capable of communicating with the mobile terminal 100 around the mobile terminal 100. [ Further, when the detected wearable device is a device authenticated to communicate with the mobile terminal 100 according to the present invention, the control unit 180 transmits at least a part of the data processed by the mobile terminal 100 to the near field communication module 114 To the wearable device. Therefore, the user of the wearable device can use the data processed by the mobile terminal 100 through the wearable device. For example, the user can make a phone call through the wearable device when a phone call is received in the mobile terminal 100, or transmit a message received through the wearable device when the message is received in the mobile terminal 100 It is possible to confirm.

The position information module 115 is a module for obtaining the position (or current position) of the mobile terminal, and a representative example thereof is a Global Positioning System (GPS) module or a Wireless Fidelity (WiFi) module. For example, when the mobile terminal utilizes the GPS module, it can acquire the position of the mobile terminal by using a signal transmitted from the GPS satellite. As another example, when the mobile terminal utilizes the Wi-Fi module, the position of the mobile terminal can be acquired based on information of a wireless access point (AP) transmitting or receiving a wireless signal with the Wi-Fi module. The location information module 115 may replace or additionally perform any of the other modules of the wireless communication unit 110 to obtain data regarding the location of the mobile terminal as needed. The location information module 115 is a module used to obtain the location (or current location) of the mobile terminal, and is not limited to a module that directly calculates or obtains the location of the mobile terminal.

Next, the input unit 120 is for inputting image information (or signal), audio information (or signal), data, or information input from a user. For inputting image information, Or a plurality of cameras 121 may be provided. The camera 121 processes image frames such as still images or moving images obtained by the image sensor in the video communication mode or the photographing mode. The processed image frame may be displayed on the display unit 151 or stored in the memory 170. [ The plurality of cameras 121 provided in the mobile terminal 100 may be arranged to have a matrix structure and the mobile terminal 100 may be provided with various angles or foci through the camera 121 having the matrix structure A plurality of pieces of image information can be input. The plurality of cameras 121 may be arranged in a stereo structure to acquire left and right images for realizing a stereoscopic image.

The microphone 122 processes the external acoustic signal into electrical voice data. The processed voice data can be utilized variously according to a function (or a running application program) being executed in the mobile terminal 100. Meanwhile, various noise elimination algorithms may be implemented in the microphone 122 to remove noise generated in receiving an external sound signal.

The user input unit 123 is for receiving information from a user and when the information is inputted through the user input unit 123, the control unit 180 can control the operation of the mobile terminal 100 to correspond to the input information . The user input unit 123 may include a mechanical input unit (or a mechanical key such as a button located on the front, rear or side of the mobile terminal 100, a dome switch, a jog wheel, Etc.) and touch-type input means. For example, the touch-type input means may comprise a virtual key, a soft key, or a visual key displayed on the touch screen through a software process, or may be disposed on a portion other than the touch screen And a touch key. On the other hand, the virtual key or the visual key can be displayed on the touch screen with various forms, for example, graphic, text, icon, video, or a combination thereof Lt; / RTI >

Meanwhile, the sensing unit 140 senses at least one of information in the mobile terminal, surrounding environment information surrounding the mobile terminal, and user information, and generates a corresponding sensing signal. The control unit 180 may control the driving or operation of the mobile terminal 100 or may perform data processing, function or operation related to the application program installed in the mobile terminal 100 based on the sensing signal. Representative sensors among various sensors that may be included in the sensing unit 140 will be described in more detail.

First, the proximity sensor 141 refers to a sensor that detects the presence of an object approaching a predetermined detection surface or an object existing in the vicinity of the detection surface without mechanical contact using an electromagnetic force or infrared rays. The proximity sensor 141 may be disposed in the vicinity of the inner area of the mobile terminal or the touch screen, which is covered by the touch screen.

Examples of the proximity sensor 141 include a transmission type photoelectric sensor, a direct reflection type photoelectric sensor, a mirror reflection type photoelectric sensor, a high frequency oscillation type proximity sensor, a capacitive proximity sensor, a magnetic proximity sensor, and an infrared proximity sensor. In the case where the touch screen is electrostatic, the proximity sensor 141 can be configured to detect the proximity of the object with a change in the electric field along the proximity of the object having conductivity. In this case, the touch screen (or touch sensor) itself may be classified as a proximity sensor.

For the sake of convenience of explanation, the act of recognizing that an object is located on the touch screen while the object is not in contact with the touch screen is referred to as "proximity touch" Quot; contact touch ". The position at which an object is touched on the touch screen means a position at which the object corresponds vertically to the touch screen when the object is touched. The proximity sensor 141 can detect a proximity touch and a proximity touch pattern (for example, proximity touch distance, proximity touch direction, proximity touch speed, proximity touch time, proximity touch position, proximity touch movement state, and the like). Meanwhile, the control unit 180 processes data (or information) corresponding to the proximity touch operation and the proximity touch pattern sensed through the proximity sensor 141 as described above, and further provides visual information corresponding to the processed data to the touch screen Can be output on the display device. Further, the control unit 180 may control the mobile terminal 100 such that different operations or data (or information) are processed depending on whether a touch to the same point on the touch screen is a proximity touch or a contact touch.

The touch sensor uses a touch (or touch input) applied to the touch screen (or the display unit 151) by using at least one of various touch methods such as a resistance film type, a capacitive type, an infrared type, an ultrasonic type, Detection.

For example, the touch sensor may be configured to convert a change in a pressure applied to a specific portion of the touch screen or a capacitance generated in a specific portion into an electrical input signal. The touch sensor may be configured to detect a position, an area, a pressure at the time of touch, a capacitance at the time of touch, and the like where a touch object touching the touch screen is touched on the touch sensor. Here, the touch object may be a finger, a touch pen, a stylus pen, a pointer, or the like as an object to which a touch is applied to the touch sensor.

If there is a touch input to the touch sensor, the corresponding signal (s) is sent to the touch controller. The touch controller processes the signal (s) and transmits the corresponding data to the controller 180. Thus, the control unit 180 can know which area of the display unit 151 is touched or the like. Here, the touch controller may be a separate component from the controller 180, and may be the controller 180 itself.

On the other hand, the control unit 180 may perform different controls or perform the same control according to the type of the touch object, which touches the touch screen (or a touch key provided on the touch screen). Whether to perform different controls or to perform the same control according to the type of the touch object may be determined according to the current state of the mobile terminal 100 or an application program being executed.

On the other hand, the touch sensors and proximity sensors described above can be used independently or in combination to provide short (touch), long (touch), multi touch, drag touch Touches such as flick touch, pinch-in touch, pinch-out touch, swipe touch, hovering touch, Sensing can be performed.

The ultrasonic sensor can recognize the position information of the object to be sensed by using ultrasonic waves. Meanwhile, the controller 180 can calculate the position of the wave generating source through the information sensed by the optical sensor and the plurality of ultrasonic sensors. The position of the wave source can be calculated by using the fact that the light is much faster than the ultrasonic wave, that is, the time when the light reaches the optical sensor is much faster than the time when the ultrasonic wave reaches the ultrasonic sensor. More specifically, the position of the wave generating source can be calculated using the time difference with the time when the ultrasonic wave reaches the reference signal.

The camera 121 includes at least one of a camera sensor (for example, a CCD, a CMOS, etc.), a photo sensor (or an image sensor), and a laser sensor.

The camera 121 and the laser sensor may be combined with each other to sense a touch of the sensing object with respect to the three-dimensional stereoscopic image. The photosensor can be laminated to the display element, which is adapted to scan the movement of the object to be detected proximate to the touch screen. More specifically, a photosensor mounts a photo diode and a transistor (TR) in a row / column and scans the contents placed on the photosensor using an electrical signal that changes according to the amount of light applied to the photo diode. That is, the photo sensor performs the coordinate calculation of the object to be sensed according to the amount of change of light, and the position information of the object to be sensed can be obtained through the calculation.

The display unit 151 displays (outputs) information processed by the mobile terminal 100. For example, the display unit 151 may display execution screen information of an application program driven by the mobile terminal 100 or UI (User Interface) and GUI (Graphic User Interface) information according to the execution screen information.

Also, the display unit 151 may be configured as a stereoscopic display unit for displaying a stereoscopic image.

In the stereoscopic display unit, a three-dimensional display system such as a stereoscopic system (glasses system), an autostereoscopic system (no-glasses system), a projection system (holographic system) can be applied.

The sound output unit 152 may output audio data received from the wireless communication unit 110 or stored in the memory 170 in a call signal reception mode, a call mode or a recording mode, a voice recognition mode, a broadcast reception mode, The sound output unit 152 also outputs sound signals related to functions (e.g., call signal reception sound, message reception sound, and the like) performed by the mobile terminal 100. The audio output unit 152 may include a receiver, a speaker, a buzzer, and the like.

The haptic module 153 generates various tactile effects that the user can feel. A typical example of the haptic effect generated by the haptic module 153 may be vibration. The intensity and pattern of the vibration generated in the haptic module 153 can be controlled by the user's selection or the setting of the control unit. For example, the haptic module 153 may combine and output different vibrations or sequentially output the vibrations.

In addition to the vibration, the haptic module 153 may include a pin arrangement vertically moving with respect to the contact skin surface, a spraying force or suction force of the air through the injection port or the suction port, a scratch on the skin surface, contact of an electrode, And various tactile effects such as an effect of reproducing a cold sensation using an endothermic or exothermic element can be generated.

The haptic module 153 can transmit the tactile effect through the direct contact, and the tactile effect can be felt by the user through the muscles of the finger or arm. The haptic module 153 may include two or more haptic modules 153 according to the configuration of the mobile terminal 100.

The light output unit 154 outputs a signal for notifying the occurrence of an event using the light of the light source of the mobile terminal 100. Examples of events that occur in the mobile terminal 100 may include message reception, call signal reception, missed call, alarm, schedule notification, email reception, information reception through an application, and the like.

The signal output from the light output unit 154 is implemented as the mobile terminal emits light of a single color or a plurality of colors to the front or rear surface. The signal output may be terminated by the mobile terminal detecting the event confirmation of the user.

The interface unit 160 serves as a path for communication with all external devices connected to the mobile terminal 100. The interface unit 160 receives data from an external device or supplies power to each component in the mobile terminal 100 or transmits data in the mobile terminal 100 to an external device. For example, a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, a port for connecting a device having an identification module an audio input / output port, a video I / O port, an earphone port, and the like may be included in the interface unit 160.

Meanwhile, the identification module is a chip for storing various kinds of information for authenticating the usage right of the mobile terminal 100 and includes a user identification module (UIM), a subscriber identity module (SIM) a universal subscriber identity module (USIM), and the like. Devices with identification modules (hereinafter referred to as "identification devices") can be manufactured in a smart card format. Accordingly, the identification device can be connected to the terminal 100 through the interface unit 160. [

The interface unit 160 may be a path through which power from the cradle is supplied to the mobile terminal 100 when the mobile terminal 100 is connected to an external cradle or various command signals input from the cradle And may be a passage to be transmitted to the terminal 100. The various command signals or power from the cradle can be operated as a signal for recognizing that the mobile terminal 100 is correctly mounted on the cradle.

The memory 170 may store a program for the operation of the controller 180 and temporarily store input / output data (e.g., a phone book, a message, a still image, a moving picture, etc.). The memory 170 may store data related to vibrations and sounds of various patterns output upon touch input on the touch screen.

The memory 170 may be a flash memory type, a hard disk type, a solid state disk type, an SDD type (Silicon Disk Drive type), a multimedia card micro type ), Card type memory (e.g., SD or XD memory), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read memory, a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, and / or an optical disk. The mobile terminal 100 may operate in association with a web storage that performs storage functions of the memory 170 on the Internet.

Meanwhile, as described above, the control unit 180 controls the operation related to the application program and the general operation of the mobile terminal 100. [ For example, when the state of the mobile terminal satisfies a set condition, the controller 180 may execute or release a lock state for restricting input of a user's control command to applications.

The control unit 180 may perform control and processing related to voice communication, data communication, video call, or the like, or may perform pattern recognition processing capable of recognizing handwriting input or drawing input performed on the touch screen as characters and images, respectively have. Further, the controller 180 may control any one or a plurality of the above-described components in order to implement various embodiments described below on the mobile terminal 100 according to the present invention.

The power supply unit 190 receives external power and internal power under the control of the controller 180 and supplies power necessary for operation of the respective components. The power supply unit 190 includes a battery, the battery may be an internal battery configured to be chargeable, and may be detachably coupled to the terminal body for charging or the like.

Also, the power supply unit 190 may include a connection port, and the connection port may be configured as an example of an interface 160 through which an external charger for supplying power for charging the battery is electrically connected.

As another example, the power supply unit 190 may be configured to charge the battery in a wireless manner without using a connection port. In this case, the power supply unit 190 may use at least one of an inductive coupling method based on a magnetic induction phenomenon from an external wireless power transmission apparatus and a magnetic resonance coupling method based on an electromagnetic resonance phenomenon, .

In the following, the various embodiments may be embodied in a recording medium readable by a computer or similar device using, for example, software, hardware, or a combination thereof.

1B to 1C are views illustrating a concept of a mobile terminal 100 according to an exemplary embodiment of the present invention. 1B to 1C, the mobile terminal 100 according to an embodiment of the present invention includes a bar-shaped terminal body. However, the present invention is not limited thereto, and can be applied to various structures such as a folder type, a flip type, a slide type, a swing type, and a swivel type in which a watch type, a clip type, a glass type or two or more bodies are relatively movably coupled. A description of a particular type of mobile terminal, although relevant to a particular type of mobile terminal, is generally applicable to other types of mobile terminals.

Here, the terminal body can be understood as a concept of referring to the mobile terminal 100 as at least one aggregate.

The mobile terminal 100 includes a case (for example, a frame, a housing, a cover, and the like) that forms an appearance. As shown, the mobile terminal 100 may include a front case 101 and a rear case 102. Various electronic components are disposed in the inner space formed by the combination of the front case 101 and the rear case 102. At least one middle case may be additionally disposed between the front case 101 and the rear case 102.

A display unit 151 is disposed on a front surface of the terminal body to output information. The window 151a of the display unit 151 may be mounted on the front case 101 to form a front surface of the terminal body together with the front case 101. [

Electronic components may be mounted on the rear case 102 as occasion demands. Electronic parts that can be mounted on the rear case 102 include detachable batteries, an identification module, a memory card, and the like. In this case, a rear cover 103 for covering the mounted electronic component can be detachably coupled to the rear case 102. Therefore, when the rear cover 103 is separated from the rear case 102, the electronic parts mounted on the rear case 102 are exposed to the outside.

As shown, when the rear cover 103 is coupled to the rear case 102, a side portion of the rear case 102 can be exposed. In some cases, the rear case 102 may be completely covered by the rear cover 103 during the engagement. Meanwhile, the rear cover 103 may be provided with an opening for exposing the camera 121b or the sound output unit 152b to the outside.

These cases 101, 102, and 103 may be formed by injection molding of synthetic resin or may be formed of metal such as stainless steel (STS), aluminum (Al), titanium (Ti), or the like.

Unlike the above example in which the mobile terminal 100 provides an internal space in which a plurality of cases accommodate various electronic components, one case may be configured to provide the internal space. In this case, a universal mobile terminal 100 in which a synthetic resin or metal is connected from the side to the rear side can be realized.

Meanwhile, the mobile terminal 100 may include a waterproof portion (not shown) for preventing water from penetrating into the terminal body. For example, the waterproof portion is provided between the window 151a and the front case 101, between the front case 101 and the rear case 102, or between the rear case 102 and the rear cover 103, And a waterproof member for sealing the inner space.

The mobile terminal 100 is provided with a display unit 151, first and second sound output units 152a and 152b, a proximity sensor 141, an illuminance sensor 142, a light output unit 154, Cameras 121a and 121b, first and second operation units 123a and 123b, a microphone 122, an interface unit 160, and the like.

1B and 1C, a display unit 151, a first sound output unit 152a, a proximity sensor 141, an illuminance sensor 142, an optical output unit 154, The first camera 121a and the first operation unit 123a are disposed on the rear side of the terminal body and the second operation unit 123b, the microphone 122 and the interface unit 160 are disposed on the side surface of the terminal body, A mobile terminal 100 in which a second sound output unit 152b and a second camera 121b are disposed will be described as an example.

However, these configurations are not limited to this arrangement. These configurations may be excluded or replaced as needed or placed on another side. For example, the first operation unit 123a may not be provided on the front surface of the terminal body, and the second sound output unit 152b may be provided on the side surface of the terminal body rather than the rear surface of the terminal body.

The display unit 151 displays (outputs) information processed by the mobile terminal 100. For example, the display unit 151 may display execution screen information of an application program driven by the mobile terminal 100 or UI (User Interface) and GUI (Graphic User Interface) information according to the execution screen information.

The display unit 151 may be a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), a flexible display display, a 3D display, and an e-ink display.

In addition, the display unit 151 may exist in two or more depending on the embodiment of the mobile terminal 100. [ In this case, the plurality of display units may be spaced apart from one another or may be integrally disposed on the mobile terminal 100, or may be disposed on different surfaces of the mobile terminal 100, respectively.

The display unit 151 may include a touch sensor that senses a touch with respect to the display unit 151 so that a control command can be received by a touch method. When a touch is made to the display unit 151 using the touch sensor, the touch sensor senses the touch and the control unit 180 generates a control command corresponding to the touch based on the touch. The content input by the touch method may be a letter or a number, an instruction in various modes, a menu item which can be designated, and the like.

On the other hand, the touch sensor is formed as a film having a touch pattern, and is disposed between the window 151a and a display (not shown) on the rear surface of the window 151a, or a metal wire directly patterned on the rear surface of the window 151a It is possible. Alternatively, the touch sensor may be formed integrally with the display. For example, the touch sensor may be disposed on a substrate of the display, or may be provided inside the display.

As described above, the display unit 151 may form a touch screen together with the touch sensor. In this case, the touch screen may function as a user input unit 123 (see FIG. 1A). In some cases, the touch screen may replace at least some functions of the first operation unit 123a.

The first sound output unit 152a may be implemented as a receiver for transmitting a call sound to a user's ear and the second sound output unit 152b may be implemented as a loud speaker for outputting various alarm sounds or multimedia playback sounds. ). ≪ / RTI >

The window 151a of the display unit 151 may be provided with an acoustic hole for emitting the sound generated from the first acoustic output unit 152a. However, the present invention is not limited to this, and the sound may be configured to be emitted along an assembly gap (for example, a gap between the window 151a and the front case 101) between the structures. In this case, the outer shape of the mobile terminal 100 can be made more simple because the hole that is formed independently for the apparent acoustic output is hidden or hidden.

The optical output unit 154 is configured to output light for notifying the occurrence of an event. Examples of the event include a message reception, a call signal reception, a missed call, an alarm, a schedule notification, an email reception, and reception of information through an application. The control unit 180 may control the light output unit 154 to terminate the light output when the event confirmation of the user is detected.

The first camera 121a processes an image frame of a still image or a moving image obtained by the image sensor in the photographing mode or the video communication mode. The processed image frame can be displayed on the display unit 151 and can be stored in the memory 170. [

The first and second operation units 123a and 123b may be collectively referred to as a manipulating portion as an example of a user input unit 123 operated to receive a command for controlling the operation of the mobile terminal 100 have. The first and second operation units 123a and 123b can be employed in any manner as long as the user is in a tactile manner such as touch, push, scroll, or the like. Also, the first and second operation units 123a and 123b may be employed in a manner that the user operates the touch panel without touching the user through a proximity touch, a hovering touch, or the like.

In this figure, the first operation unit 123a is a touch key, but the present invention is not limited thereto. For example, the first operation unit 123a may be a mechanical key, or a combination of a touch key and a touch key.

The contents input by the first and second operation units 123a and 123b can be variously set. For example, the first operation unit 123a receives a command such as a menu, a home key, a cancellation, a search, and the like. The second operation unit 123b receives an instruction from the first or second sound output unit 152a or 152b And a switch to the touch recognition mode of the display unit 151 can be input.

On the other hand, a rear input unit (not shown) may be provided on the rear surface of the terminal body as another example of the user input unit 123. The rear input unit is operated to receive a command for controlling the operation of the mobile terminal 100, and input contents may be variously set. For example, commands such as power on / off, start, end, scrolling and the like, control of the size of sounds output from the first and second sound output units 152a and 152b, A command such as switching can be inputted. The rear input unit may be implemented as a touch input, a push input, or a combination thereof.

The rear input unit may be disposed so as to overlap with the front display unit 151 in the thickness direction of the terminal body. For example, the rear input unit may be disposed at the rear upper end of the terminal body so that the user can easily operate the terminal body by using the index finger when the user holds the terminal body with one hand. However, the present invention is not limited thereto, and the position of the rear input unit can be changed.

When a rear input unit is provided on the rear surface of the terminal body, a new type of user interface using the rear input unit can be realized. Also, when the first operation unit 123a is not disposed on the front surface of the terminal body in place of at least a part of the functions of the first operation unit 123a provided on the front surface of the terminal body, The unit 151 can be configured to have a larger screen.

Meanwhile, the mobile terminal 100 may be provided with a fingerprint recognition sensor for recognizing the fingerprint of the user, and the controller 180 may use the fingerprint information sensed through the fingerprint recognition sensor as authentication means. The fingerprint recognition sensor may be embedded in the display unit 151 or the user input unit 123.

The microphone 122 is configured to receive the user's voice, other sounds, and the like. The microphone 122 may be provided at a plurality of locations to receive stereophonic sound.

The interface unit 160 is a path through which the mobile terminal 100 can be connected to an external device. For example, the interface unit 160 may include a connection terminal for connection with another device (for example, an earphone or an external speaker), a port for short-range communication (for example, an IrDA port, a Bluetooth port, , A wireless LAN port, etc.), or a power supply terminal for supplying power to the mobile terminal 100. [ The interface unit 160 may be implemented as a socket for receiving an external card such as a SIM (Subscriber Identification Module) or a UIM (User Identity Module) or a memory card for storing information.

And a second camera 121b may be disposed on a rear surface of the terminal body. In this case, the second camera 121b has a photographing direction which is substantially opposite to that of the first camera 121a.

The second camera 121b may include a plurality of lenses arranged along at least one line. The plurality of lenses may be arranged in a matrix form. Such a camera can be called an array camera. When the second camera 121b is configured as an array camera, images can be taken in various ways using a plurality of lenses, and a better quality image can be obtained.

The flash 124 may be disposed adjacent to the second camera 121b. The flash 124 shines light toward the subject when the subject is photographed by the second camera 121b.

And a second sound output unit 152b may be additionally disposed in the terminal body. The second sound output unit 152b may implement a stereo function together with the first sound output unit 152a and may be used for implementing a speakerphone mode in a call.

The terminal body may be provided with at least one antenna for wireless communication. The antenna may be embedded in the terminal body or formed in the case. For example, an antenna constituting a part of the broadcast receiving module 111 (see FIG. 1A) may be configured to be able to be drawn out from the terminal body. Alternatively, the antenna may be formed in a film type and attached to the inner surface of the rear cover 103, or a case including a conductive material may be configured to function as an antenna.

The terminal body is provided with a power supply unit 190 (see FIG. 1A) for supplying power to the mobile terminal 100. The power supply unit 190 may include a battery 191 built in the terminal body or detachable from the outside of the terminal body.

The battery 191 may be configured to receive power through a power cable connected to the interface unit 160. The battery 191 may also be configured to be wirelessly chargeable via a wireless charger. The wireless charging may be implemented by a magnetic induction method or a resonance method (magnetic resonance method).

In the figure, the back cover 103 is coupled to the rear case 102 so as to cover the battery 191, thereby limiting the detachment of the battery 191 and protecting the battery 191 from external impacts and foreign substances. . When the battery 191 is detachably attached to the terminal body, the rear cover 103 may be detachably coupled to the rear case 102.

The mobile terminal 100 may be provided with an accessory that protects the appearance or supports or expands the function of the mobile terminal 100. [ One example of such an accessory is a cover or pouch that covers or accommodates at least one surface of the mobile terminal 100. The cover or pouch may be configured to interlock with the display unit 151 to expand the function of the mobile terminal 100. Another example of an accessory is a touch pen for supplementing or extending touch input to the touch screen.

Hereinafter, embodiments related to a control method that can be implemented in the mobile terminal 100 configured as above will be described with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

FIG. 2 is a view for explaining a problem of a photographed image by a conventional mobile terminal 100. FIG. FIG. 2 shows an image generated by flashing a specific scene, and particularly, an image taken at different exposure values (Exposure Value). The exposure values described below and the gain of the camera 121 are well-known contents, and the details will be omitted below.

2 (a) is an image generated by applying a small exposure value to a scene in which a flash is emitted. In this case, the subject 131 may appear bright enough to be recognized by the human eye. However, since the background except for the subject 131 appears dark, it is difficult for the user to recognize the background. That is, in the case of an image according to a small exposure value, only the subject 131 is often recognized by the human eye.

On the contrary, FIG. 2 (b) shows an image generated by applying a large number of exposure values to a scene in which a flash is emitted. In this case, the background except for the subject 131 can be clearly displayed to the human eye. However, since the subject 131 appears too bright, it is difficult to recognize it in the human eye. That is, in many cases, only the background except for the subject 131 is recognized by the human eye.

Therefore, as shown in FIG. 2 (c), only one exposure value or one gain may be difficult to recognize not only the subject 131 but also the background thereof to the human eye. This is because, in order to sharpen the subject 131 with respect to the current illuminance, the exposure value must be lower than the reference exposure value, whereas the exposure value must be higher than the reference exposure value in order to sharpen the background.

Hereinafter, methods for solving the above-mentioned problems will be described. 6 to 8, a method of acquiring a plurality of images according to flash emission will be described in detail. 9 to 17, a method of determining a range of brightness adjustment values of an image based on illuminance values according to whether or not the flash is emitted, and acquiring a plurality of images according to a determined range of brightness adjustment values will be described. Here, a plurality of images may be images obtained by different exposure values or different gains, and may have different brightness values (i.e., pixel levels) for the same area. 18 to 25, a method of acquiring an image as shown in FIG. 2C by combining a plurality of acquired images will be described.

3 is a flowchart illustrating a control method of the mobile terminal 100 according to an embodiment of the present invention.

Referring to FIG. 3, the mobile terminal 100 according to an exemplary embodiment of the present invention may emit light (S310).

Specifically, the control unit 180 may control the light emitting unit 154 to emit light, and may control the illuminance sensor 142 to measure the illuminance value using the emitted light (S310). Here, the illuminance value may mean the brightness of the external environment measured by pre-flash. The pre-emission and the main flash are described in detail in FIG.

Meanwhile, the mobile terminal 100 according to another embodiment of the present invention may measure the illuminance value without emitting light, and this will be described in detail with reference to FIG.

Thereafter, the mobile terminal 100 can acquire a plurality of image frames for one scene (S320).

Specifically, the control unit 180 may control the camera 121 to acquire a plurality of image frames for one scene using the emitted light (S320). Here, the controller 180 may calculate the illuminance values before and after the pre-emission, respectively, and thereby determine the range of the brightness adjustment values for the plurality of images to be generated. In this case, the brightness adjustment value can be determined by changing at least one of the exposure value or the gain.

On the other hand, the main light emission may be performed to obtain a plurality of image frames by applying at least one of brightness adjustment values determined as a result of performing pre-emission, that is, exposure value or gain. Here, the different brightness adjustment values are applied to each of the plurality of images, as described above. Thus, a plurality of generated image frames can have different brightness levels, i.e., different pixel levels, for a specific region. This will be described in detail in FIG. 10 to FIG.

Thereafter, the mobile terminal 100 may generate one high dynamic range (HDR) image using at least one of the plurality of acquired image frames (S330).

In this case, the controller 180 deletes image frames having an average brightness value less than or greater than a predetermined range among the plurality of acquired image frames, and generates one HDR image using the remaining image frames.

Also, the controller 180 may delete an image frame having an average brightness value for a part of the plurality of image frames, which is less than or equal to a predetermined range, and generate one HDR image using the remaining image frames.

In addition, the control unit 180 can extract an image for a specific area from any one of a plurality of image frames, and can apply a weight for each area.

Since a method of generating at least two of the plurality of candidate images to generate one HDR image is well known, detailed description thereof will be omitted. A specific embodiment will be described in detail with reference to FIGS. 18 to 25 do.

Thereafter, the mobile terminal 100 may display one generated HDR image on the display unit 151 (S340).

According to this method, since different exposure values or gains are applied according to the current illumination value, a plurality of candidate image frames that are various and adaptive can be generated.

Also, since one HDR image is generated from a plurality of adaptive candidate image frames, the image quality of the HDR image is clear despite the influence of the flash.

On the other hand, unlike the case of FIG. 3, it may not be necessary for the flash to emit when photographing the camera 121. For example, if the illuminance value is low enough, if the illumination is sufficient for the room.

FIG. 4 is a flowchart illustrating a control method of the mobile terminal 100 according to an exemplary embodiment of the present invention. In FIG. 3, the illumination value according to the flash emission is measured (S310) Is not described in the following description. Hereinafter, the description of the parts overlapping with the above description will be omitted.

Referring to FIG. 4, the mobile terminal 100 may measure the illuminance value (S410).

Specifically, the controller 180 may control the illuminance sensor 142 to measure the illuminance value in a state in which the flash is not emitted (S410). In this case, the controller 180 measures the illuminance value in the current state, and if the illuminance value is equal to or greater than the predetermined illuminance value, the flash is not emitted, and if the illuminance is less than the predetermined illuminance value, .

Thereafter, the mobile terminal 100 may acquire a plurality of image frames for one scene (S420).

Specifically, the control unit 180 may control the camera 121 to acquire a plurality of image frames for one scene without the flash being emitted (S420). Here, the controller 180 may determine a range of the brightness adjustment value for a plurality of images according to the illuminance value of the current state. Thus, a plurality of generated image frames can have different brightness levels, i.e., different pixel levels, for a specific region.

Thereafter, the mobile terminal 100 may generate one HDR image using at least one of the plurality of acquired image frames (S430), and display the generated one HDR image on the display unit 151 ( S440).

According to this method, there is an effect that the power consumption is reduced as compared with the case of using the flash in generating the HDR image.

5 is an example of a diagram for explaining the relationship between the exposure value (Exposure Value) and the gain (gain) according to the brightness of the image. As described above, the brightness adjustment value can be determined by at least one of the exposure value or the gain. 5, the relationship between the exposure value and the gain will be described.

Referring to FIG. 5, the vertical axis relates to the exposure value or the exposure time, and the horizontal axis refers to the gain value. In this case, when the exposure value or the exposure time is increased, an image having a high brightness value can be obtained and an image having a high brightness value can be obtained even if the gain is increased.

The gain at point A is 1, so it is lower than the gain at point B. However, since the exposure value at the A point is 1/10 [sec], it is higher than the exposure value at the B point. Therefore, as shown in FIG. 5, it can be seen that the brightness of the point A and that of the point B are the same. Specifically, the brightness due to the exposure value and the gain can be defined as a product of positive values.

6 to 8 are various examples of drawings for explaining light emission modes according to the mobile terminal 100 according to an embodiment of the present invention. 6 to 8, a method of acquiring a plurality of images according to the flash emission will be described. Hereinafter, the description of the parts overlapping with the above description will be omitted.

First, the controller 180 controls the light emitting unit 154 to perform the first light emission for determining at least one of the exposure value or the gain, and the second light emission for forming the illumination value corresponding to at least one of the determined exposure value or the determined gain And the illuminance value according to the second light emission can be controlled to be the average value of the illuminance value according to the first light emission. This will be described in detail in Fig.

In FIG. 6, the above-described first light emission and second light emission are shown in a graph.

The first light emission may be a light emission for measuring the illuminance value for one scene in the shooting. That is, the control unit 180 can determine at least one of the exposure value and the gain for the scene according to the first light emission. Accordingly, the first light emission may be a pre-light emission, and at least one of the exposure value or the gain may be determined before the second light emission after the first light emission. It is noted that the brightness adjustment value can be determined by changing at least one of the exposure value or the gain.

And the second light emission may be such that an illuminance value corresponding to at least one of the determined exposure value or gain is emitted. That is, the second light emission may be the main light emission, and the controller 180 may acquire a plurality of image frames corresponding to the main emission by applying at least one of the brightness adjustment value determined as a result of the pre-emission, i.e., the exposure value or the gain .

On the other hand, the section a is a transient state section of the current for initiating the pre-emission. section c is the transient state section of the current for the termination of the pre-emission. Therefore, the period b is a steady state period of the current for the pre-emission, and the pre-emission can be performed in the period b.

Similarly, the period d is a transient state section of the current for starting the main emission. The section f is a transient state section of the current for terminating the main emission. Thus, the period e may be a steady-state period of the current for the main emission, and the main emission may be performed in the period e.

On the other hand, the light emission time may be relatively large compared to the main light emission. However, the current value according to the same time interval can be relatively large compared to the main light emission. In this case, the illuminance value can be determined according to the light emission time and the current value, and the controller 180 can control the illuminance value according to the main light emission to be an average value of the illuminance value according to the pre-light emission.

On the other hand, the control unit 180 can perform the above-described control by continuously performing a plurality of main emission without performing the preliminary emission. This will be described in detail with reference to FIGS. 7 to 8, and a description of the parts overlapping with the above description will be omitted.

In FIG. 7, a case in which two consecutive main luminescence are performed in a state in which there is no pre-luminescence is shown in a graph.

g < / RTI > may be a section where the first main emission occurs. The first main emission may be one which is emitted in order to measure the illuminance value for one scene in the photographing. That is, the control unit 180 may determine at least one of the exposure value and the gain for the scene according to the first main emission.

and the period h may be a period in which the second main emission occurs. And the second main emission may be such that an illuminance value corresponding to at least one of the determined exposure value or gain is emitted. That is, the controller 180 may acquire a plurality of image frames corresponding to the second main emission by applying at least one of a brightness adjustment value determined as a result of the first main emission, i.e., an exposure value or a gain.

FIG. 8 is a graph showing the case where three consecutive main light emissions are performed in a state in which there is no pre-emission.

The i-th period may be an interval during which the initial light emission is made to determine at least one of the exposure value or the gain. The period j may start at the same time as the end of the initial light emission and may be a period in which at least one intermediate light emission is performed to form an illuminance value between the illuminance value according to the initial light emission and the illuminance value according to the last light emission. The section k may be a section in which post-emission is performed to form an illuminance value corresponding to at least one of the determined exposure value or the determined gain.

In this case, the controller 180 may acquire the first image frame corresponding to the initial light emission, the second image frame corresponding to the intermediate light emission, and the third image frame corresponding to the later light emission, respectively. The control unit 180 may generate one HDR image using at least one of the plurality of acquired image frames.

In FIG. 8, only three main light emission is shown, but the present invention is not limited thereto. Accordingly, n main light emission may be performed. In this case, the controller 180 may generate one HDR image using at least one of n image frames.

9 to 17, a method of determining a range of brightness adjustment values of an image according to illuminance values according to whether or not the flash is emitted, and acquiring a plurality of candidate image frames according to the determined range of brightness adjustment values will be described. Hereinafter, the description of the parts overlapping with the above description will be omitted.

In order to generate a plurality of candidate image frames, the controller 180 firstly measures the illuminance value of the current state to determine a first brightness adjustment value, which will be described with reference to FIG. 9 to FIG. In this case, the range of the brightness adjustment value may be determined based only on the first brightness adjustment value determined according to the current illumination value, and the range of the brightness adjustment value may be determined by further considering the following cases.

Therefore, the control unit 180 determines whether the subject 131 close to one scene is included and determines the second brightness adjustment value, which will be described with reference to FIG. 12 through FIG. In this case, the range of the brightness adjustment value may be determined based only on the second brightness adjustment value determined according to the current illumination value and the proximity subject, and the range of the brightness adjustment value may be determined by further considering the following cases.

Therefore, the control unit 180 determines whether the face 131 of the subject includes a human face to determine the third brightness adjustment value, which will be described with reference to FIG. 15 to FIG. In this case, the range of the brightness adjustment value can be determined only by the third brightness adjustment value determined according to the present state of the illuminance, the proximity of the subject, and whether the face of the subject includes the face. The range of the brightness adjustment value may be determined.

Accordingly, the control unit 180 determines whether the specific area is moved to determine the fourth brightness adjustment value, which will be described with reference to FIG.

9 to 17 are various examples of drawings for explaining the setting of the brightness adjustment value according to the mobile terminal 100 according to an embodiment of the present invention.

In Fig. 9, a method of determining the first brightness adjustment value will be described. 9, the indoor unit is illustrated, but the present invention is not limited thereto and can be applied to the outdoor unit. FIG. 9A shows a dark indoor image and shows a state in which the flash is not emitted. FIG. 9B shows a state in which the flash is emitted in the same place. The flash light emission may be a pre-light emission.

In this case, the control unit 180 increases at least one of the increase of the exposure value or the increase of the gain as the difference between the measured illumination value and the preset value decreases, and as the difference between the measured illumination value and the preset value increases, It is possible to reduce at least one of the gain of the gain. Here, the predetermined value may be 0 [Lx] as the reference illuminance value. In other words, for relatively dark scenes, it is possible to increase at least one of the increase in the brightness value and decrease the increase in the brightness value for a relatively bright scene.

Therefore, FIG. 9A can increase the brightness increase as in the case of the low illuminance in FIG. 10 because the difference between the illuminance of 0 [Lx] and the illumination value is relatively small. Accordingly, the candidate image frame for synthesizing the HDR image shown in FIG. 9 (c) can be generated with various brightness values.

On the other hand, FIG. 9 (b) has a relatively large difference between the environment of 0 [Lx] and the illuminance value, so that the increase of the brightness value can be reduced as in the case of the high illuminance of FIG.

In FIG. 10, the brightness adjustment value will be described in detail.

As described above, in a relatively low illumination environment, it is necessary to broaden the brightness value range of the candidate image frame by increasing the brightness adjustment value. In this case, the brightness adjustment value can be defined as the product of the exposure value and the gain as described above. Therefore, as shown in FIG. 10, the combination of the exposure value and the gain may have various cases in which the product of the positive values becomes 4. Therefore, it is possible to acquire various candidate image frames belonging to the dark image of 4 times from the current illuminance value and within 4 times of bright image at low illumination.

On the other hand, FIG. 10 illustrates a case where the brightness adjustment value is 4, but this is merely an example for explanation. The same is applied hereinafter.

Also, the range of the brightness value may be within a positive value from a negative value with respect to the determined brightness adjustment value, but is not limited thereto. Therefore, the range of the brightness value may be within the brightness adjustment value determined from the same brightness value as the current brightness value. The same is applied hereinafter.

On the contrary, in an environment with relatively high illumination, it is not necessary to increase the brightness adjustment value, so it is necessary to narrow the brightness value range of the candidate image frame. Therefore, as shown in FIG. 10, there may be various cases where the combination of the exposure value and the gain is such that the product of the positive values becomes 2. Therefore, it is possible to acquire various candidate image frames belonging to the dark image from the dark image twice to the bright image at the high illuminance.

On the other hand, in FIG. 11, a range of a current illumination value is set, and a method of generating a low-illuminance image frame or a high-illuminance image frame for the corresponding range will be described in detail.

In general, increasing the exposure value increases the brightness value, whereas blurring of the image may be increased. Also, increasing the gain increases the brightness value, while the noise in the image can be increased. Therefore, in increasing the brightness value, it is necessary to appropriately adjust the exposure value and the gain according to the current illuminance.

It is necessary to relatively broaden the range of the brightness value as described above in the low illumination environment. However, since the exposure value and the gain are both high in a low-illuminance environment, it is necessary to reduce blurring and noise.

Accordingly, when the measured illuminance value is less than 500 [Lx], the control unit 180 obtains a darker image frame than the predetermined basic image frame by decreasing the exposure value and the gain, respectively, So that an image frame can be obtained.

In a mid-tone environment, noise is less likely to occur than in a low-light environment, so only blurring can be reduced.

Accordingly, when the measured illuminance value is less than 500 [Lx] and less than 1500 [Lx], the control unit 180 obtains a darker image frame than the predetermined basic image frame by decreasing only the exposure value, A brighter image frame can be obtained.

It is necessary to relatively narrow the range of the brightness value as described above in the high-contrast environment. However, in a high-contrast environment, noise is less likely to occur than in a low-light environment, so only blurring can be reduced.

Accordingly, when the measured illumination value is equal to or greater than 1500 [Lx], the controller 180 acquires a darker image frame than the predetermined basic image frame by decreasing only the exposure value, decreases the exposure value and increases the gain, A bright image frame can be obtained.

12 to 13, a method of determining the second brightness adjustment value will be described. FIG. 12 shows a case where the subject 131 close to one scene is not included. FIG. 13 shows a case where the subject 131 close to one scene is included.

When the first brightness adjustment value according to the current illumination value is determined, the control unit 180 can control the light emitting unit 154 to perform pre-emission. Accordingly, the controller 180 can obtain the first brightness value, i.e., the first brightness level, for the image before the pre-emission, and the second brightness level for the image after the pre-emission, i.e., the second pixel level. Here, the first brightness value and the second brightness value may mean an average of brightness values for one image, i.e., an average value of pixel levels.

Also, the controller 180 may apply at least one of the increase of the exposure value or the increase of the gain by comparing the first brightness value and the second brightness value. In the case of FIG. 12 (b), which is the image after the pre-emission, the brightness value may be higher than that of FIG. 12 (a) before the pre-emission, Is assumed to be 7. 13 (b), which is the image after the pre-emission, may have a higher brightness value than that of the pre-emission image of FIG. 13 (a), and the change rate of the brightness value Is assumed to be 34.

In this case, the controller 180 increases the brightness adjustment value as the rate of change of the brightness value increases, and decreases the brightness adjustment value as the rate of change of the brightness value decreases. In the example described above, the rate of change of the brightness value is higher in the case of FIG. 13 as compared with the case of FIG. Therefore, the brightness adjustment value may be larger when the close subject 131 is present than when the close subject 131 is not present. In other words, if it is determined that there is the proximity subject 131, the controller 180 may increase the brightness value range by increasing at least one of the increase of the exposure value of the candidate image frame or the increase of the gain.

On the other hand, when it is determined that the close subject 131 is present, the controller 180 may apply at least one of the increase of the exposure value or the increase of the gain so that the brightness value of the subject 131 is saturated. In other words, the control unit 180 may increase at least one of the exposure value or the gain so that the average value of the pixel level with respect to the subject 131 is 255 or close thereto.

Accordingly, a candidate image frame for synthesizing one HDR image can be generated with various brightness values.

On the other hand, Fig. 14 explains another method for determining the second brightness adjustment value. Fig. 14 (a) shows a case where the subject 131 close to one scene is not included, and Fig. 14 (b) shows a case where the subject 131 close to one scene is included.

When the first brightness adjustment value according to the current illumination value is determined, the control unit 180 can control the light emitting unit 154 to perform pre-emission. The controller 180 may acquire the first image before the pre-emission and the second image after the pre-emission.

Then, the controller 180 may measure the number of pixels of the second image which is darker than the first image, that is, the brightness of which is decreased. 14 (a) shows a pixel region of a second image which is darker than an image before pre-emission, when the subject 131 is not present. FIG. 14B shows a pixel region of the second image which is darker than the image before the pre-emission, when the subject 131 is present.

In this case, the controller 180 increases the brightness adjustment value as the number of pixels in the dark region, that is, the dark region increases, and decreases the brightness adjustment value as the number of pixels in the dark region decreases. In other words, if it is determined that there is the proximity subject 131, the controller 180 may increase the brightness value range by increasing at least one of the increase of the exposure value of the candidate image frame or the increase of the gain.

Accordingly, a candidate image frame for synthesizing one HDR image can be generated with various brightness values.

15 to 16, a method of determining a brightness adjustment value when a subject's face is included in the subject 131 will be described. Here, a method for determining whether or not a face of a person is included in the subject 131 is well known, and thus a detailed description thereof will be omitted.

FIG. 15B is a diagram showing a case where the brightness value is increased as compared with FIG. 15A, assuming that the increase in brightness value is +4. If it is determined that the subject 131 is included in one scene, the increase in the brightness value can be increased as described above. However, a face of a person can react sensitively to light, unlike other general subjects 131. Therefore, if the same brightness value as the general subject 131 is applied, the face area can be saturated as shown in FIG. 15 (b). In other words, in the case of a general subject 131, the subject 131 may not saturate even if +4, which is an increase in the brightness value, is applied, but it may be saturated when a brightness value increase of +4 is applied to a face of a person.

Accordingly, if it is determined that the face of the person is included in the subject 131, the controller 180 may reduce at least one of the increase of the brightness value, that is, the increase of the exposure value or the increase of the gain. For example, for an image including a human face, +2, which is a value smaller than +4, which is an increase in brightness value for a general subject 131, can be applied.

In addition, if it is determined that the subject 131 includes a human face, the controller 180 may reduce at least one of the brightness value, i.e., the exposure value or the gain. For example, for an image including a face of a person, a value of -6, which is a value lower than a brightness value of a general subject 131, can be applied.

Therefore, unlike the case of FIG. 15 (b), the face region of a person may not be saturated in the case of FIG. 16 (b).

Accordingly, a candidate image frame for synthesizing one HDR image including a human face can be generated with various brightness values.

On the other hand, the embodiments shown in Figs. 9 to 16 may be applied independently or in combination. Hereinafter, specific examples will be exemplified, and the numerical values presented are merely examples, and thus the scope of the rights is not limited thereto.

As an example, consider the case of a close-up subject in one scene in dark outdoors. In this case, since the first condition is dark roughness, the brightness adjustment value is set to be high and can be determined as +8. The second condition is outdoor, and since the change rate of the brightness value in the outdoor is relatively low compared to the indoor, the brightness adjustment value can be set to a low value and can be determined as +2. The third condition is the presence of a close subject. If there is a close subject, the number of pixels of the dark portion may be large at the time of pre-emission before the pre-emission, so the brightness adjustment value may be set to be high and set to +4.

Thus, the total score is 8 + 2 + 4 = 14, which is the sum of the above brightness adjustment values, and the final brightness adjustment value can be 14/9 divided by 9.

As another example, let's take a look at cases where a scene in the dark outdoors does not include a close subject. In this case, since the first condition is dark roughness, the brightness adjustment value is set to be high and can be determined as +8. The second condition is outdoor, and since the change rate of the brightness value in the outdoor is relatively low compared to the indoor, the brightness adjustment value can be set to a low value and can be determined as +2. The third condition is that there is no close subject. If there is no close subject, the brightness adjustment value may be set to 0, since there may be almost no number of pixels of the dark portion at pre-emission before pre-emission.

Thus, the total score is 8 + 2 = 10, which is the sum of the brightness adjustment values described above, and the final brightness adjustment value may be 10/9 divided by 9.

As another example, consider the case where a human face is included in one scene in the dark outdoors. In this case, since the first condition is dark roughness, the brightness adjustment value is set to be high and can be determined as +8. The second condition is outdoor, and since the change rate of the brightness value in the outdoor is relatively low compared to the indoor, the brightness adjustment value can be set to a low value and can be determined as +2. The third condition is the presence of a close subject. If there is a close subject, the number of pixels of the dark portion may be large at the time of pre-emission before the pre-emission, so the brightness adjustment value may be set to be high and set to +4. The fourth condition is that the face is included in the subject. If the face is included, the brightness adjustment value may be set to negative value to be -6.

Thus, the total score is 8 + 2 + 4-6 = 8, which is the sum of the above brightness adjustment values, and the final brightness adjustment value can be 8/9 divided by 9.

On the other hand, in Fig. 17, a method of determining the brightness adjustment value when a part or whole area of the image is moved will be described. The control unit 180 can determine whether the plurality of candidate image frames generated according to the above-described method are moving. A method of determining whether or not a motion of a plurality of candidate image frames is determined will be described later with reference to FIG. 23 to FIG.

Referring to FIG. 17, an image during pre-emission may appear as a first frame to a third frame. Here, the first-first area 133 of the first frame may be an area including the same image as the first-second area 134 of the second frame and the first-third area 135 of the third frame. However, in the case where the position of the specific region is inconsistent as shown in FIG. 17 during the pre-emission, it can be judged that there is motion.

Accordingly, if it is determined that there is motion as a result of performing the pre-emission, the controller 180 may decrease the exposure value and increase the gain. If it is determined that there is no motion as a result of the pre-emission, the controller 180 may increase the exposure value and reduce the gain.

Accordingly, when motion of the subject 131 or the like occurs during the pre-emission, a candidate image frame for synthesizing one HDR image can be generated with various brightness values.

18 to 25 are various examples of drawings for explaining synthesis of input images whose brightness values are adjusted according to the mobile terminal 100 according to an embodiment of the present invention. Hereinafter, a method of generating an HDR image without saturation and darkness by synthesizing a plurality of images obtained according to the above will be described. On the other hand, one HDR image may be generated according to various known methods as well as the following description. Hereinafter, the description of the parts overlapping with the above description will be omitted.

The control unit 180 may perform an image analysis on each of the plurality of candidate image frames generated, select an image to be used for the HDR image, and synthesize the selected image to generate an HDR image. Particularly, the image analysis for the brightness value or the saturation degree will be described with reference to FIGS. 18 to 21, and the image analysis for the color will be described with reference to FIG. A method of determining that motion of the camera 121 or the subject 131 is generated as a result of image analysis for each of the generated plurality of candidate image frames and aligning the motion is described in FIG. 23 to FIG.

The control unit 180 may measure an average value of brightness values of at least one area of each of the plurality of acquired image frames. 18 (a) shows an HDR image generated by combining a background area having a high brightness value and a subject area 131 having a low brightness value among a plurality of acquired image frames. FIG. 18 (b) shows an HDR image generated by combining the background region of the intermediate brightness value and the subject region 131 of the middle brightness value among the plurality of acquired image frames. FIG. 18 (c) shows an HDR image generated by combining a background region of a low brightness value and a subject region 131 of a high brightness value among a plurality of acquired image frames.

Here, the controller 180 may generate one HDR image using at least one of the image frames except the image frame whose average value of the brightness values is out of the predetermined brightness value range. Therefore, if the background of FIG. 18 (a) and the subject 131 are out of the predetermined brightness value range, they can be deleted. For example, if the average brightness value of the background region is less than 10, the controller 180 determines that the average brightness value is less than 10, and deletes the corresponding image frame. Also, if the average brightness value of the subject 131 area is equal to or greater than 245, the controller 180 determines that it is saturated and can delete the corresponding image frame. This also applies to the case of FIG. 18 (c).

On the other hand, as described above, there is a case where only the corresponding region is used for the HDR image instead of deleting the entire specific image frame. For example, if the average brightness value of the background region is less than 10 but the average brightness value of the subject region 131 is 125, the controller 180 sets the region of the subject 131 of the first candidate image frame to HDR It can be used as a subject 131 area of an image.

On the other hand, the controller 180 can set a weight for the region of interest or the region of interest (ROI) of the camera 121. A method of synthesizing an HDR image with an average value of weights of a plurality of candidate image frames is a well-known technique, and thus the details thereof are omitted. Also, the HDR image may be synthesized using the brightness histogram of the candidate image frame having the reference brightness value. Since this method is a well-known technique, the details are omitted.

On the other hand, if the flash is emitted in a dark environment, the brightness of the background region may be very low. Therefore, it is preferable that the background region is extracted from the image frame having the highest brightness among the plurality of candidate image frames and used for the HDR image. However, it should be understood that the present invention is not necessarily limited to this, but may be extracted from an image frame having a brightness value optimal for observation with a human eye.

Thus, as shown in FIG. 18 (b), it is possible to generate an HDR image optimal for observation by the user's eyes.

19 to 21 illustrate various examples of HDR images generated by variously combining a plurality of candidate image frames.

19 to 21, there is shown a case where a subject area 131 having various brightness values is synthesized with respect to a background area having a high brightness value, a background area having a high brightness value, and a low background area among a plurality of candidate image frames.

Here, if the difference between the illuminance value before pre-emission and the illuminance value according to pre-emission is within a preset range, the controller 180 determines whether the subject 131 area and the background area It is possible to extract one HDR image and generate one HDR image. That is, the difference between the illuminance value before the pre-emission and the illuminance value due to the pre-emission is within a preset range means that the variation of the illuminance value due to the pre-emission is insignificant, which means an environment with a high illuminance value.

Therefore, in a relatively bright environment, it is possible to extract the background region from the image before pre-emission and extract the region of the object 131 from the image according to the main emission.

When the difference between the illuminance value before pre-emission and the illuminance value due to pre-emission is out of a preset range, the controller 180 controls the image of the subject 131 and the background area from the image according to the pre- It is possible to extract one HDR image and generate one HDR image. That is, the difference between the illuminance value before the pre-emission and the illuminance value due to the pre-emission is out of the predetermined range means that the variation of the illuminance value due to the pre-emission is large, which means a low illuminance environment.

Therefore, in the relatively dark environment, the subject region 131 can be extracted from the image according to the pre-emission, and the background region can be extracted from the image according to the main emission.

On the other hand, the brightness values of a plurality of generated image frames may be low. In this case, if saturation does not occur in an image frame having the highest brightness value among a plurality of image frames, the image frame can be determined as an HDR image and displayed. Similarly, the brightness values of a plurality of generated image frames may be all high. In this case, if the dark portion is not included in the image frame having the lowest brightness value among the plurality of image frames, the image frame can be determined as the HDR image and displayed. According to this method, errors due to image synthesis can be prevented, and the HDR image generation speed can be accelerated.

FIG. 22 is a diagram for explaining a method of analyzing colors for a plurality of candidate image frames to prevent color distortion due to heat of the light emitting unit 154. FIG.

When the flash is emitted, heat is inevitably generated in the light emitting unit 154. In this case, if the light emission time is long or the illumination value according to the light emission is high, the image according to the light emission may have a blue-based color. This is the case when the color is distorted, so it is necessary to correct the color.

Accordingly, the controller 180 extracts at least one of the image frames except for the image frame whose B value is out of the preset value among the brightness values of the obtained plurality of image frames, and if the B value for each of the remaining image frames is It is possible to generate one HDR image using at least one of the image frames reduced by the set value.

Specifically, referring to FIG. 22, it can be seen that the B value for the three candidate image frames is higher than that in the general case. That is, if the B value exceeding a preset value is measured from the candidate image frame, the controller 180 can determine that the image is distorted due to the heat of the light emitting unit 154.

In this case, the control unit 180 can convert a plurality of images into images having a reduced B value according to a preset adjustment ratio. Although FIG. 22 shows a case where the adjustment ratio is 0.3, this is merely an example. Also, if the measured B value is excessive as in the third image frame of FIG. 22, the corresponding image frame can be deleted, and the ratio of the B value as the reference can be set variously.

On the other hand, in FIG. 22, only the value of B is mentioned, but the present invention is not limited thereto. Therefore, the same applies to R value or G value.

According to this method, color distortion due to heat generation or various causes of the light emitting unit 154 can be compensated.

23 to 25, a method for determining that motion of the camera 121 or the subject 131 is determined as a result of image analysis for each of a plurality of candidate image frames, and aligning the same is described below.

FIG. 23 illustrates three candidate video frames, and the controller 180 can determine whether two or more candidate video frames are moving. In this case, the control unit 180 can extract a specific area and determine whether the area is moving based on whether the area is matched. This will be described with reference to FIG.

Referring to FIG. 24, the controller 180 may set the pixel block as a region for determining whether the pixel block is moving. In FIG. 24, nine adjacent pixels are one pixel block, but the present invention is not limited thereto.

On the other hand, the upper part of Fig. 24 is the image before the brightness conversion is performed, and the lower part of Fig. 24 is the image after the brightness conversion.

First, referring to the top of FIG. 24, the first-1 pixel block PB1 is included in the first candidate image frame, and the average brightness values of nine pixels are all 50. FIG. In this case, the controller 180 may convert the brightness value to a reference brightness value, for example, (100, 100, 100), as shown in FIG. 24 (a).

The first 1-2 pixel block PB2 is included in the second candidate image frame, and the average brightness value of the four pixels is 100 and the average brightness value of the 5 pixels is 60. [ In this case, the 1-2 pixel block PB2 is equal to the reference brightness value in the above-described example, so that no separate brightness value conversion is required, as shown in FIG. 24 (b).

The 1-3 pixel block PB3 is included in the third candidate image frame, and the average brightness value of the four pixels is 180 and the average brightness value of the 5 pixels is 140. [ In this case, the controller 180 may convert the brightness value to a reference brightness value, as shown in FIG. 24 (c).

The brightness value of each pixel block can be compared after conversion to the reference brightness value. Referring to the bottom of FIG. 24, in the case of the converted average brightness value of the pixel block, the 1-1 pixel block PB1 is different from the 1-2 pixel block PB2 and the 1-3 pixel block PB3 . Accordingly, it can be determined that the motion of the camera 121 or the subject 131 is generated for the corresponding pixel block.

If it is determined that there is motion, the control unit 180 can perform alignment for each of two or more image frames. This will be described with reference to FIG.

In the example described above, since the movement of the camera 121 or the subject 131 has occurred, alignment with respect to the first candidate frame is required. Therefore, as shown in FIG. 25, the alignment can be performed by moving the first image frame so that the positions of the images coincide with each other.

The present invention described above can be embodied as computer readable codes on a medium on which a program is recorded. A computer readable medium includes any type of recording device in which data that can be read by a computer system is stored. Examples of the computer readable medium include a hard disk drive (HDD), a solid state disk (SSD), a silicon disk drive (SDD), a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, And may also be implemented in the form of a carrier wave (e.g., transmission over the Internet). The computer may also include a controller 180 of the terminal. The foregoing detailed description, therefore, should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

100: mobile terminal 110: wireless communication unit
120: AV input unit 130: user input unit
140: sensing unit 150: output unit
160: interface unit 170: memory
180: control unit 190: power supply unit

Claims (21)

A light emitting portion;
camera;
An illuminance sensor for measuring an illuminance value using light emitted from the light emitting unit; And
Acquiring a plurality of image frames for one scene from the camera using the emitted light and generating one HDR image using at least one of the acquired plurality of image frames; And a controller
Wherein,
And acquires the plurality of image frames by applying at least one of an exposure value and a gain to the one scene in accordance with the measured illuminance value. The method according to claim 1,
Wherein,
And increasing at least one of an increase in the exposure value or an increase in the gain as the difference between the measured illuminance value and the predetermined value is smaller,
And decreasing at least one of an increase in the exposure value or an increase in the gain as the difference between the measured illuminance value and the preset value increases. The method according to claim 1,
Wherein,
Calculating a brightness value for each of the plurality of images according to the measured illuminance value to obtain a first brightness value before the light emission and a second brightness value corresponding to the light emission,
Wherein the first brightness value and the second brightness value are compared with each other to apply at least one of the increase of the exposure value or the increase of the gain. The method of claim 3,
Wherein the one scene includes at least one object,
Wherein,
Wherein at least one of the increase of the exposure value or the increase of the gain is applied so that the brightness of the at least one subject is saturated. The method of claim 3,
Wherein,
Increasing at least one of an increase in the exposure value or an increase in the gain as the difference between the ratio of the first brightness value to the second brightness value and a preset value increases,
And decreasing at least one of an increase of the exposure value or an increase of the gain as the ratio of the first brightness value to the second brightness value is smaller than the predetermined value. The method according to claim 1,
Wherein,
Acquiring a first image frame before the light emission and a second image frame corresponding to the light emission,
Wherein the control unit increases at least one of an increase in the exposure value or an increase in the gain as the difference between the average value of the brightness values for the second image frame and the average value of the brightness values for the first image frame decreases,
Wherein the at least one of the increase of the exposure value or the increase of the gain is reduced as the difference between the average value of the brightness values for the second image frame and the average value of the brightness values for the first image frame increases. The method according to claim 1,
Wherein,
If it is determined that the face of the person is not included in the one scene, at least one of the increase of the exposure value or the increase of the gain is increased,
And decreasing at least one of an increase in the exposure value or an increase in the gain when it is determined that the face of the person is included in the one scene. The method according to claim 1,
Wherein,
Acquiring an image frame darker than a predetermined basic image frame by decreasing the exposure value and the gain, respectively, when the measured illumination value is less than 500 [Lx]
And acquires a bright image frame that is brighter than the predetermined basic image frame by increasing only the exposure value. The method according to claim 1,
Wherein,
If the measured illuminance value is less than 500 [Lx] and less than 1500 [Lx], the image frame darker than the predetermined basic image frame is obtained by reducing only the exposure value,
And acquires a bright image frame that is brighter than the predetermined basic image frame by increasing only the exposure value. The method according to claim 1,
Wherein,
When the measured illuminance value is 1500 [Lx] or more, an image frame darker than a predetermined basic image frame is obtained by reducing only the exposure value,
And obtains an image frame brighter than the predetermined basic image frame by decreasing the exposure value and increasing the gain. The method according to claim 1,
Wherein,
Controls the light emitting unit to perform a first light emission for allowing at least one of the exposure value or the gain to be determined and a second light emission for forming an illumination value corresponding to at least one of the determined exposure value or the determined gain,
Wherein the controller controls the illuminance value according to the second light emission to be an average value of the illuminance value according to the first light emission. 12. The method of claim 11,
Wherein,
Determines whether or not the plurality of image frames are moving,
If it is determined that the first light emission is performed, the exposure value is decreased and the gain is increased,
Wherein the mobile terminal increases the exposure value and decreases the gain when it is determined that there is no motion as a result of performing the first light emission. 12. The method of claim 11,
Wherein the plurality of image frames include:
A first area that is an area including one subject and a second area that is an area other than the first area,
Wherein,
Wherein when the difference between the illuminance value before the first light emission and the illuminance value due to the first light emission is within a predetermined range, the first region and the second region respectively display the image according to the second light emission and the first light emission And extracts and synthesizes the image from the previous image to generate the one HDR image. 12. The method of claim 11,
Wherein the plurality of image frames include:
A first area that is an area including one subject and a second area that is an area other than the first area,
Wherein,
Wherein when the difference between the illuminance value before the first light emission and the illuminance value due to the first light emission is out of a predetermined range, the first region and the second region respectively emit the image according to the first light emission and the second light emission And extracts and synthesizes the image from the image according to the generated HDR image. The method according to claim 1,
Wherein,
An initial light emission for determining at least one of the exposure value and the gain, a post light emission for forming an illumination value corresponding to at least one of the determined exposure value or the determined gain, And at least one intermediate light emission for forming an illuminance value between an illuminance value according to the second light emission and an illuminance value according to the latter light emission,
Acquiring a plurality of image frames corresponding to each of the initial light emission, the post-light emission, and the at least one intermediate light emission, and generating one HDR image using at least one of the obtained plurality of image frames, . The method according to claim 1,
Wherein,
Measuring an average value of brightness values of at least one area of each of the obtained plurality of image frames,
Wherein the one HDR image is generated using at least one of the image frames excluding an image frame whose average value of the brightness values is out of a predetermined brightness value range. 17. The method of claim 16,
Wherein,
Extracting at least one of image frames excluding a video frame whose B value is out of a predetermined value among brightness values of the obtained plurality of video frames,
And generates the one HDR image using at least one of image frames whose B values for each of the remaining image frames are reduced by a predetermined value. 17. The method of claim 16,
Wherein,
Determining whether or not two or more of the remaining video frames are moving,
And performs alignment for each of the at least two image frames if it is determined that the motion is present. 19. The method of claim 18,
Wherein,
Converts an average value of brightness values of each of the at least two image frames into a predetermined value,
Calculating an average value of brightness values for each of the at least two image frames with respect to the same pixel block,
Wherein the controller determines that the motion occurs when the average values of the brightness values are different from each other. camera;
An illuminance sensor for measuring an illuminance value; And
And a controller for acquiring a plurality of images for one scene from the camera and generating one HDR image using at least one of the acquired plurality of images,
Wherein,
Wherein the plurality of images are obtained by applying at least one of an exposure value or a gain to the one scene in accordance with the measured illuminance value. Measuring an illuminance value using light emitted from the light emitting portion;
Obtaining a plurality of image frames for one scene using the emitted light; And
And generating one HDR (High Dynamic Range) image using at least one of the plurality of acquired image frames,
Wherein the obtaining of the plurality of image frames comprises:
Wherein the plurality of image frames are acquired by applying at least one of an exposure value or a gain to the one scene in accordance with the measured illuminance value.

Images