JP6504845B2 - Imaging device, control method therefor, and control program - Google Patents

Description

  The present invention relates to an imaging device, a control method thereof, and a control program, and more particularly to an imaging device for performing photographing with reduced flicker.

  Generally, in an imaging apparatus using an imaging element such as a CCD or CMOS sensor, when photographing is performed under a fluorescent lamp connected to a commercial power source, the brightness varies for each photographed image depending on the shutter speed (shutter speed) There is something to do. Furthermore, bright and dark horizontal stripes may occur in the captured image.

  Such fluctuation of light and dark in the photographed image is called flicker. Note that the shutter is controlled at shutter speed of n / 120 sec for n / 100 seconds (n is a natural number) for flicker that occurs when the power supply frequency is 50 Hz, and for flicker that occurs when the power supply frequency is 60 Hz. For example, it is known that flicker can be reduced.

  As described above, when photographing under a flicker light source, shutter speed capable of reducing flicker is limited. Therefore, when the user sets the shutter speed, flicker may occur depending on the shutter speed set by the user.

  Therefore, there is an imaging apparatus in which imaging is performed at a shutter time that can reduce flicker closest to the user-set shutter second to obtain an image with reduced flicker (see Patent Document 1).

  Furthermore, as a method of detecting the presence or absence of flicker and the flicker frequency, for example, there is a method of setting a frame rate at the time of live view to a rate shifted by a half cycle from the flicker frequency (see Patent Document 2). Here, the image obtained as a result of imaging is analyzed, the flicker component in the image is extracted, and the presence or absence of flicker and the flicker frequency are detected.

JP, 2010-268363, A JP, 2013-24933, A

  However, in the imaging device described in Patent Document 1, even when the shutter speed is set by the user setting, the image capturing is performed at the shutter speed which can reduce flicker closest to the shutter time. That is, the user can only perform imaging only at the shutter speed that can reduce flicker, and the degree of freedom at the time of imaging is limited.

  On the other hand, in order to capture an image at an arbitrary shutter speed, it is sufficient to detect the flicker phase and synchronize the shutter timing with the flicker peak timing. However, with the method described in Patent Document 2, although the presence or absence of flicker and the flicker frequency can be detected in the live view state, the flicker phase can not be detected.

  Furthermore, if the shutter speed for live view is a shutter speed that can reduce flicker (n / 100 sec or n / 120 sec), it is not possible to detect the presence or absence of flicker.

  Therefore, it is an object of the present invention to provide an imaging device capable of reducing flicker without being limited in shutter speed even when shooting from a live view operation, a control method thereof, and a control program thereof. is there.

  In order to achieve the above object, an image pickup apparatus according to the present invention is an image pickup apparatus provided with an image pickup means for picking up an image of an object through an image pickup optical system and obtaining image data. The first detection means for performing flicker detection that detects at least a flicker cycle and its phase according to a photometric result, and a live view operation for sequentially displaying the image data on the display unit when photographing the object, Determining means for determining whether or not flicker detection is to be performed by the detection means, and when it is determined that the flicker detection is to be performed by the first detection means, the flicker detection by the first detection means is performed. And the subject image is led to the image pickup means to perform photographing based on the flicker cycle and the phase obtained by the first detection means. And having a control means for controlling the timing, the.

The control method according to the present invention is a control method of an image pickup apparatus including an image pickup means for picking up an image of an object by picking up an image of an object through an image pickup optical system. a detection step of performing flicker detection to detect at least flicker period and the phase, or the time of image data via a live view operation sequentially displayed on the display unit to shoot the object, performs flicker detection by previous dangerous out steps If it is determined that the flicker detection is performed in the detection step, the flicker detection is performed in the detection step, and then the subject image is led to the imaging unit to perform the flicker detection. A control system for controlling the timing of photographing based on the flicker cycle and the phase obtained by the detection step. Characterized in that it has Tsu and up, the.

The control program according to the present invention is a control program used in an imaging apparatus including an imaging unit for imaging an object through an imaging optical system to obtain image data, and a computer included in the imaging apparatus measures the subject image Detecting the flicker according to at least the flicker cycle and its phase according to the photometry result obtained and performing a live view operation of sequentially displaying the image data on the display unit; and dangerous out determination step of determining whether to perform flicker detection by step, it is determined to perform the flicker detection by the detecting step in the determination step, after performing the flicker detection by the detection step, the The flicker circumference obtained by the detection step by guiding the subject image to the imaging means And wherein the executing and a control step of controlling the timing of the imaging based on the phase.

  According to the present invention, when photographing an object through the live view operation, it is determined whether or not the flicker detection is to be performed by the first detection means. Flicker can be reduced without limitation.

It is a block diagram showing the composition about an example of the imaging device by an embodiment of the invention. It is a figure for demonstrating the operation | movement of the photometry process part shown in FIG. It is a flowchart for demonstrating the imaging | photography process by the camera shown in FIG. It is a figure for demonstrating the relationship between the imaging | photography timing in the camera shown in FIG. 1, and the peak timing of a flicker. It is a flowchart for demonstrating the 1st example of the light metering implementation determination for flicker detection shown in FIG. It is a flowchart for demonstrating the 2nd example of the light metering implementation determination for flicker detection shown in FIG. It is a flowchart for demonstrating the 3rd example of the light metering implementation determination for flicker detection shown in FIG.

  Hereinafter, an example of an imaging device according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of an example of an imaging device according to an embodiment of the present invention.

  The illustrated imaging apparatus is, for example, a digital camera (hereinafter simply referred to as a camera), and includes a camera body 100 and a lens unit 200. The lens unit 200 is detachable from the camera body 100, that is, interchangeable.

  The lens unit 200 includes a lens 201 (imaging optical system). The lens 201 is, for example, composed of a plurality of lenses, but here, a single lens is shown for simplicity. The communication terminal 206 is a terminal for the lens unit 200 to communicate with the camera body 100.

  The communication terminal 206 is connected to the communication terminal 118 provided in the camera body 100 when the lens unit 200 is attached to the camera body 100. That is, the lens unit 200 communicates with the camera control unit 105 provided in the camera body 100 via the communication terminals 206 and 118.

  The lens unit 200 includes a lens system control circuit 205. The lens system control circuit 205 controls driving of the diaphragm 202 via the diaphragm driving unit 204. Further, the lens system control circuit 205 brings the lens 201 into focus by moving the lens 201 along the optical axis and displacing the lens 201 via the focus driver 203.

  In the camera body 100, the main mirror 101 is disposed on the optical axis (also referred to as a photographing optical path) of the lens unit 200. The main mirror 101 is pivotable in accordance with the operating state of the camera, and is positioned obliquely to the photographing optical path (shown by a broken line in the figure) when observing the subject with a finder. As a result, an optical image (object image) incident from the lens unit 200 is guided to a finder optical system described later.

  At the time of photographing and at the time of live view, the main mirror 101 is retracted from the photographing light path. As a result, the optical image incident from the lens unit 200 is guided to the image sensor 103 described later. In FIG. 1, the position when the main mirror is positioned on the photographing optical path is indicated by a solid line block 101, and the position when the main mirror is retracted from the photographing optical path is indicated by a broken line block 101 '.

  A shutter 102 is disposed downstream of the main mirror 101, and the shutter 102 controls the incidence of an optical image incident from the lens unit 200 on the imaging element 103. The shutter 102 is in an open state during shooting and live view.

  The shutter 102 is controlled by the shutter control unit 115 under the control of the camera control unit 105.

  An imaging element 103 is disposed downstream of the shutter 102. As the imaging element 103, for example, a CMOS sensor or a CCD sensor is used. The imaging element 103 is driven based on the timing signal output from the timing generator 116, and outputs an electrical signal (analog signal) corresponding to the optical image.

  The timing generator 116 sends a timing signal for controlling a so-called electronic shutter to the image sensor 103 under the control of the camera control unit 105.

  The analog signal processing unit 104 samples and holds an analog signal output from the image sensor 103 and adds an analog gain, and then converts the analog signal into a digital signal by A / D conversion. The camera control unit 105 performs digital signal processing described later on a digital signal output from the analog signal processing unit 104 to generate image data, and stores the image data in the memory 121 via the memory control unit 120.

  As illustrated, the camera control unit 105 includes a digital gain unit 106, an image processing unit 107, a live view flicker detection unit 108, a photometric processing unit 113, and a photometric sensor flicker detection unit 114.

  The digital gain unit 106 adds digital gain to the digital signal output from the analog signal processing unit 104. Then, the digital gain unit 106 outputs the digital signal to which the digital gain is added to the image processing unit 107 and the live view flicker detection unit 108.

  The live view flicker detection unit 108 analyzes the digital signal output from the digital gain unit 106 to extract a flicker component in the digital signal. Then, the live view flicker detection unit 108 determines the presence or absence of flicker and the flicker frequency according to the extraction result, and outputs a flicker determination result (also referred to as a detection result).

  In addition, since the flicker in a fluorescent lamp is mentioned as an example here, a flicker determination result becomes either the flicker resulting from the power supply frequency of 50 Hz, or the flicker resulting from the power supply frequency of 60 Hz.

  The image processing unit 107 performs predetermined digital signal processing on the digital signal output from the digital gain unit 106. For example, the image processing unit 107 performs pixel interpolation processing, color conversion processing, calculation of an imaging plane AF (contrast AF) evaluation value, and calculation of a photometric value.

  The image display unit 119 is a monitor for displaying an image and information regarding shooting, and is an image display device such as an LCD, for example. Then, the image display unit 119 displays an image according to the image data output from the image processing unit 107.

  In the live view operation, a so-called through image is sequentially displayed on the image display unit 119.

  The operation unit 122 is an input unit that receives an operation from a user. The operation unit 122 includes an operation dial for setting a shutter speed, a shooting instruction button, a live view switching button, and various operation buttons. The operation unit 122 sends an input operation by the user to the camera control unit 105.

  A focusing plate 109 is disposed above the main mirror 101. The focusing plate 109 is disposed on the primary imaging surface of the lens unit 200, has a Fresnel lens (condenser lens) on the incident surface thereof, and forms an optical image (finder image) of the subject on the exit surface.

  The pentaprism 110 changes the finder optical path, and corrects the object image formed on the exit surface of the focusing plate 109 to an erect image. The eyepiece lens 111 can adjust the diopter in accordance with the user's eyes when the user looks into the finder. Here, an optical system configured by the focusing plate 109, the pentaprism 110, and the eyepiece lens 111 is called a finder optical system.

  A photometric sensor 112 is disposed in the vicinity of the pentaprism 110, and the photometric sensor 112 has a plurality of areas obtained by dividing an imaging area, and a plurality of photodiodes corresponding to these areas. Then, the photometric sensor 112 detects the luminance of the subject image formed on the exit surface of the focusing plate 109 and sends it to the photometric processing unit 113.

  FIG. 2 is a diagram for explaining the operation of the photometric processing unit 113 shown in FIG.

  The photometric processing unit 113 performs accumulation drive and readout drive at a predetermined interval (that is, photometric timing) with respect to the photometric sensor 112, and measures a time-series change of the photometric value (that is, light quantity). Then, the photometric processing unit 113 outputs a photometric value (also referred to as a photometric result) obtained as a result of measurement to the photometric sensor flicker detection unit 114. The photometric sensor flicker detection unit 114 analyzes the time-series change of the photometric value to detect the presence or absence of flicker, the flicker frequency, and the peak timing (phase) of the flicker.

  The AF sensor 117 outputs a defocus amount corresponding to the shift amount of the pair of images to the camera control unit 105 by the imaging surface phase difference AF. The camera control unit 105 determines the lens driving amount and the driving direction based on the imaging surface AF evaluation value obtained by the image processing unit 107 or the defocus amount obtained by the AF sensor 117.

  The camera control unit 105 sends the lens drive amount and the drive direction to the lens system control circuit 205 via the communication terminals 118 and 206. The lens system control circuit 205 causes the focus drive unit 203 to drive the lens 201 along the optical axis according to the lens drive amount and the drive direction.

  The camera control unit 105 is a microcomputer including a CPU, a ROM, and a RAM, and executes a program stored in the ROM to control the entire camera.

  FIG. 3 is a flowchart for explaining the photographing process by the camera shown in FIG. The processing according to the flowchart in the drawing is performed under the control of the camera control unit 105.

  When the photographing operation is started, for example, when the power of the camera is turned on, the camera control unit 105 retracts (mirrors up) the main mirror 101 from the photographing optical path, and the shutter control unit 115 fully opens the shutter 102 ( Step S101).

  Subsequently, the camera control unit 105 performs a live view operation (step S102). In the live view operation, the optical image that has passed through the lens unit 200 is incident on the imaging device 103. As a result, the analog signal output from the imaging device 103 is processed by the analog signal processing unit 104, the digital gain unit 106, and the image processing unit 107, and is displayed on the image display unit 119 as a through image.

  At this time, the image processing unit 107 obtains a photometric value as described above, and according to the photometric value, an exposure control value (shutter speed, aperture value, ISO, and ISO) at the time of live view image generation and shooting. Determine the sensitivity etc.). Note that the exposure control value at the time of shooting is displayed on the image display unit 119 together with the through image.

  Furthermore, the image processing unit 107 calculates the imaging plane AF (contrast AF) evaluation value as described above, and determines the lens driving amount and the driving direction based on the imaging plane AF evaluation value. Then, the camera control unit 105 controls the lens unit 200 according to the lens drive amount and the drive direction.

  When the live view operation is started, the camera control unit 105 acquires an image at shutter seconds at which flicker detection is possible (hereinafter referred to as flicker detection capable shutter seconds). Then, the live view flicker detection unit 108 performs flicker detection on the image. As described above, the live view flicker detection unit 108 detects the presence or absence and the period of the flicker (that is, the flicker frequency).

  The image acquisition at the shutter time capable of flicker detection is performed only once at the start of live view. Then, when a flicker is detected in the image, the shutter time after that is set to the shutter time when the flicker is not detected, and the imaging element 103 is driven.

  As a result, the user can view a through image that is easy to view without flicker on the image display unit 119. Note that the image acquisition at the shutter time capable of flicker detection may be continued during the live view operation. In this case, although the through image may be affected by the flicker, it is possible to detect the presence and the period of the flicker immediately before shooting.

  Furthermore, when alternately acquiring an image in shutter seconds when no flicker is detected and an image acquisition in flicker detectable shutter seconds and displaying a through image, an image acquired in shutter seconds when flicker is not detected. May be used.

  Subsequently, the camera control unit 105 determines whether the user has issued a photographing instruction via the operation unit 122 (step S103). If there is no shooting instruction (NO in step S103), the camera control unit 105 returns to the process of step S102.

  On the other hand, when a photographing instruction is issued (YES in step S103), the camera control unit 105 determines whether or not to execute photometry for flicker detection as described later (step S104). When it is determined that the photometry for flicker detection is to be performed (YES in step S104), the camera control unit 105 inserts the main mirror 101 into the photographing optical path (mirror down), and the luminance measurement by the photometry sensor 112 is possible. State (step S105).

  Next, the camera control unit 105 performs flicker detection by the photometric sensor 112 (step S106). As described above, the photometric processing unit 113 performs the accumulation drive and the readout drive at the predetermined photometric timing of the photometric sensor 112, and measures the time-series change of the photometric value. After the end of the light measurement, the light measurement processing unit 113 outputs the accumulation start time and the light measurement value to the light measurement sensor flicker detection unit 114.

  The photometric sensor flicker detection unit 114 interpolates the photometric value according to the time-series change of the photometric value, and obtains the timing (maximum timing) at which the light amount of the flicker becomes the largest and the light amount at that time (maximum light amount). Further, the photometric sensor flicker detection unit 114 obtains the timing (minimum timing) at which the light amount of flicker is minimized and the light amount (minimum light amount) at that time. Then, the photometric sensor flicker detection unit 114 analyzes the timing and the light amount to detect the presence or absence of flicker, the flicker frequency, and the peak timing (phase) of the flicker.

  Next, the camera control unit 105 retracts (mirrors up) the main mirror 101 from the imaging light path (step S107). Then, the camera control unit 105 stands by until the time at which flicker reduction imaging is possible (step S108: wait for flicker peak).

  FIG. 4 is a diagram for explaining the relationship between the shooting timing and the flicker peak timing in the camera shown in FIG.

  As shown in FIG. 4, when the photographing timing by the camera substantially matches the peak timing of the flicker, an image in which the influence of the flicker is reduced can be obtained. Here, the camera control unit 105 sets the waiting time so that the shooting timing substantially matches the peak timing of the flicker based on the shutter time at the time of shooting and the flicker timing detected in step S106. Then, the camera control unit 105 stands by until the waiting time has elapsed.

  Subsequently, the camera control unit 105 sets the shutter speed, the aperture value, and the ISO sensitivity, performs shooting control, and obtains an image. Then, the camera control unit 105 ends the shooting process.

  When it is determined that the photometry for flicker detection is not performed (NO in step S104), the camera control unit 105 proceeds to the process of step S109.

  The shutter speed, the aperture value, and the ISO sensitivity at the time of shooting are obtained according to the photometric value obtained by the live view operation described in step S102. Alternatively, the shutter speed, the aperture value, and the ISO sensitivity may be calculated according to the photometric value obtained by the photometric processing unit 113 as described in step S106. Furthermore, the user may set at least one of the shutter speed, the aperture value, and the ISO sensitivity at the time of shooting.

  FIG. 5 is a flow chart for explaining a first example of the photometric execution determination for flicker detection shown in FIG.

  When the photometry implementation determination for flicker detection is started, the camera control unit 105 determines whether or not there is a possibility of being affected by flicker at shutter speed (Tv) at the time of shooting (step S201). For example, if the power supply frequency is either 50 Hz or 60 Hz, flicker can be reduced with respect to the flicker caused by the power supply frequency if the shutter speed during shooting is n / 20 (n is a natural number) It is. Therefore, the camera control unit 105 determines not to be affected by the flicker at the shutter speed when photographing when the determination condition represented by the equation (1) is satisfied.

Tv = n / 20 (n is a natural number) (1)
Although the flicker frequency in the case where the power supply frequency is either 50 Hz or 60 Hz is considered here, if the power supply frequency is different, that is, if the flicker cycle (flicker frequency) is different, the determination condition is changed accordingly. Be done.

  If it is determined that there is a possibility of being affected by flicker at the shutter speed at the time of shooting (YES in step S201), the camera control unit 105 causes the shutter speed (Tv) at the time of shooting to be higher than the predetermined threshold Tv_th. It is determined whether it is a long second (step S202).

  When the shutter time (Tv) is equal to or less than the predetermined threshold Tv_th (equal to or less than the threshold) (NO in step S202), the camera control unit 105 determines to perform the flicker detection photometry (step S203). Then, the camera control unit 105 proceeds to the process of step S105 shown in FIG.

  If the shutter time (Tv) at the time of shooting is longer than the predetermined threshold Tv_th (YES in step S202), the camera control unit 105 determines that the photometry for flicker detection is not performed (step S204). That is, if the shutter speed at the time of shooting is sufficiently longer than the flicker cycle, the camera control unit 105 determines that it is not necessary to carry out flicker detection photometry, since the influence of the flicker is small at the time of shooting. Then, the camera control unit 105 proceeds to the process of step S109 shown in FIG.

  If it is determined that there is no possibility of being affected by the flicker at the shutter speed at the time of shooting (NO in step S201), the camera control unit 105 proceeds to the process of step S204. Note that at least one of the processes in steps S201 and S202 may be performed.

  As described above, when photographing is performed via live view operation by determining whether or not to perform flicker detection photometry, flicker detection photometry should be performed only when flicker detection photometry is necessary before photographing. It will be good.

  As a result, when the shutter speed is hardly affected by the flicker, the photographing control is performed without performing the light detection for flicker detection, so the release time lag until the photographing is performed after the photographing instruction can be shortened. .

  FIG. 6 is a flowchart for explaining a second example of the photometric execution determination for flicker detection shown in FIG.

  When the photometry execution determination for flicker detection is started, the camera control unit 105 determines whether or not the shutter speed (Tv_lv) at the time of acquiring a live view image is a shutter speed affected by flicker of a frequency assumed. (Step S301).

  Here, for example, when the power supply frequency is 50 Hz or 60 Hz, the flicker frequency is 100 Hz or 120 Hz. Therefore, if the shutter speed (Tv_lv) deviates from n / 20 (n is a natural number), which is the shutter speed at which flicker is reduced, by a predetermined value or more, the camera control unit 105 receives the shutter speed affected by the flicker. It is determined that

  If it is determined that the shutter time is affected by the flicker (YES in step S301), the camera control unit 105 determines whether the live view image is affected by the flicker (step S302). For example, if flicker fringes occur in the live view image, the camera control unit 105 determines that the live view image is affected by the flicker.

  The camera control unit 105 determines that the live view image is affected by flicker if there is a difference between light and dark between the images by comparing the live view images of a plurality of frames acquired under the same imaging condition. You may do so.

  If it is determined that the live view image is affected by flicker (YES in step S302), the camera control unit 105 determines to perform flicker detection photometry (step S303). Then, the camera control unit 105 proceeds to the process of step S105 shown in FIG.

  On the other hand, when it is determined that the live view image is not affected by the flicker (NO in step S302), the camera control unit 105 determines not to perform the flicker detection photometry (step S304). Then, the camera control unit 105 proceeds to the process of step S109 shown in FIG.

  If it is determined that the shutter time is not affected by flicker (NO in step S301), the camera control unit 105 proceeds to the process of step S303.

  As described above, when photographing is performed via live view operation by determining whether or not to perform flicker detection photometry, flicker detection photometry should be performed only when flicker detection photometry is necessary before photographing. It will be good.

  As a result, when the subject is not positioned below the flicker light source, the photographing control is performed, so that the release time lag until the photographing is performed after the photographing instruction can be shortened.

  FIG. 7 is a flow chart for explaining a third example of the light metering execution determination for flicker detection shown in FIG.

  When the flicker detection light measurement implementation determination is started, the camera control unit 105 determines whether the flicker detection result in the live view flicker detection unit 108 indicates the presence of flicker (step S401).

  Here, in the case where the process of acquiring an image in shutter seconds at which no flicker is detected during the live view operation and the process of acquiring an image in shutter seconds at which a flicker can be detected are alternately performed, The view flicker detection unit 108 analyzes the image acquired at the shutter speed that can detect flicker to obtain a flicker detection result.

  Note that after the photographing start instruction is given in step S103 shown in FIG. 3, the image may be acquired in shutter seconds that can detect flicker before the main mirror 101 is inserted into the photographing optical path (mirror down). . Then, the live view flicker detection unit 108 analyzes the image and outputs a flicker detection result.

  If it is determined that there is flicker (YES in step S401), the camera control unit 105 determines that photometry for flicker detection is to be performed (step S402). Then, the camera control unit 105 proceeds to the process of step S105 shown in FIG. On the other hand, when it is determined that there is no flicker (NO in step S401), the camera control unit 105 determines that the photometry for flicker detection is not performed (step S403). Thereafter, the camera control unit 105 proceeds to the process of step S109 shown in FIG.

  As described above, when photographing is performed via live view operation by determining whether or not to perform flicker detection photometry, flicker detection photometry should be performed only when flicker detection photometry is necessary before photographing. It will be good.

  As a result, since shooting control is performed when there is almost no influence of flicker in live view, a release time lag until shooting is performed after a shooting instruction can be shortened.

  As described above, in the embodiment of the present invention, even when shooting is performed via a live view state (live view operation), the flicker can be reduced without the shutter speed being limited.

  As is clear from the above description, in the example shown in FIG. 1, at least the imaging device 103, the analog signal processing unit 104, the digital gain unit 106, and the image processing unit 107 constitute an imaging unit.

  Furthermore, the photometric sensor 112, the photometric processing unit 113, and the photometric sensor flicker detection unit 114 function as a first detection unit, and the camera control unit 105 is a determination unit. The camera control unit 105 main mirror 101 functions as a control unit. Also, the live view flicker detection unit 108 functions as a second detection unit.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to these embodiment, The various form of the range which does not deviate from the summary of this invention is also included in this invention .

  For example, the control method may be performed by the imaging apparatus as the control method of the above-described embodiment. In addition, a program having the functions of the above-described embodiments may be used as a control program to cause a computer included in the imaging apparatus to execute the control program. The control program is recorded, for example, on a computer readable recording medium.

Other Embodiments
The present invention supplies a program that implements one or more functions of the above-described embodiments to a system or apparatus via a network or storage medium, and one or more processors in a computer of the system or apparatus read and execute the program. Can also be realized. It can also be implemented by a circuit (eg, an ASIC) that implements one or more functions.

DESCRIPTION OF SYMBOLS 100 Camera main body 101 Main mirror 103 Image sensor 105 Camera control part 107 Image processing part 108 Live view flicker detection part 112 Photometry sensor 113 Photometry processing part 114 Photometry sensor flicker detection part 200 Lens unit

Claims (11)

An imaging apparatus comprising an imaging unit for imaging an object through an imaging optical system to obtain image data, comprising:
First detection means for performing flicker detection that detects at least a flicker cycle and its phase according to a photometric result obtained by performing photometry on an object image;
A determination unit that determines whether flicker detection is to be performed by the first detection unit when shooting the subject through a live view operation of sequentially displaying the image data on a display unit;
When it is determined by the determination means that flicker detection is to be performed by the first detection means, after the flicker detection is performed by the first detection means, the subject image is led to the image pickup means to perform the first detection. Control means for controlling the timing of photographing based on the flicker cycle and the phase obtained by the detection means;
An imaging apparatus characterized by having:   The imaging apparatus according to claim 1, wherein the control unit controls the timing of the imaging in accordance with a peak timing according to the phase of the flicker.   3. The image pickup apparatus according to claim 1, wherein the determination unit determines whether to perform flicker detection by the first detection unit based on a shutter time when photographing the subject.   4. The apparatus according to claim 3, wherein the determination unit determines that the flicker detection by the first detection unit is to be performed when the shutter speed at the time of shooting the subject satisfies a predetermined determination condition. Imaging device.   2. The apparatus according to claim 1, wherein the determination unit determines that the flicker detection by the first detection unit is not performed if the shutter time when photographing the subject is longer than a predetermined threshold. The imaging device according to 2.   The determination unit determines that the shutter speed at the time of shooting the subject satisfies a predetermined determination condition, and the shutter time at the time of shooting the subject is equal to or less than a predetermined threshold. The image pickup apparatus according to claim 1 or 2, wherein it is determined that flicker detection is performed according to.   The determination means determines that flicker detection by the first detection means is to be performed when the shutter time in the live view operation is a shutter time affected by flicker. The imaging device according to 1 or 2.   When the shutter speed at the time of the live view operation is not the shutter time affected by the flicker, the determination unit is that the image data obtained at the live view operation is affected by the flicker. 8. The image pickup apparatus according to claim 7, wherein it is determined that flicker detection is to be performed by the first detection means. A second detection unit that detects the presence or absence of flicker based on the image data obtained during the live view operation and obtains a detection result;
The imaging apparatus according to claim 1, wherein the determination unit determines that the flicker detection is performed by the first detection unit when the detection result indicates the presence of flicker. A control method of an imaging apparatus, comprising: an imaging unit configured to capture an object through an imaging optical system and obtain image data,
A detection step of performing flicker detection that detects at least a flicker cycle and its phase according to a photometric result obtained by photometrically measuring an object image;
When shooting the subject through the live view operation to be sequentially displayed on the display unit the image data, and the determining step determines whether to perform the flicker detection by previous dangerous out step,
When it is determined in the determination step that flicker detection is to be performed in the detection step, the flicker detection is performed in the detection step, and then the subject image is led to the imaging unit and the flicker cycle obtained in the detection step And controlling the timing of imaging based on the phase;
A control method characterized by comprising: A control program for use in an imaging apparatus comprising an imaging unit for imaging an object through an imaging optical system to obtain image data,
In a computer provided in the imaging device,
A detection step of performing flicker detection that detects at least a flicker cycle and its phase according to a photometric result obtained by photometrically measuring an object image;
When shooting the subject through the live view operation to be sequentially displayed on the display unit the image data, and the determining step determines whether to perform the flicker detection by previous dangerous out step,
When it is determined in the determination step that flicker detection is to be performed in the detection step, the flicker detection is performed in the detection step, and then the subject image is led to the imaging unit and the flicker cycle obtained in the detection step And controlling the timing of imaging based on the phase;
A control program characterized by causing

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