JP2013020199A - Projection system, image supply device, projector, and image projection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection system, image supply device, projector, and image projection method that are able to change an image to be projected according to a change in the projecting direction of the projector.SOLUTION: The projection system 10 comprises the projector 11 and a PC 2 that supplies image data to the projector 11. The projector 11 has a projection part 3 that projects an image to a screen SC. The PC 2 includes: a range detection part 21D that obtains a projection range from image data 22B that has resolution greater than that able to be projected by the projection part 3, based on a positional relation between the screen SC and the range of projection by the projecting part 3; and an extraction part 21E that extracts a range obtained from the image data 22B by the range detection part 21D and supplies the range to the projector 11 as image data.

Description

  The present invention relates to a projection system, an image supply device, a projector, and an image projection method.

  2. Description of the Related Art Conventionally, an apparatus is known in which a projection direction is changed by swinging a projector with a swing servo mechanism in order to project an image onto a large screen with a projector (see, for example, Patent Document 1).

JP-A-6-303626

By the way, when an image is projected on a screen larger than the projection area of the projector as described in Patent Document 1, there is no method for reflecting a change in the projection direction in the projected image.
The present invention has been made in view of the above problems, and an object thereof is to provide a projection system, an image supply device, a projector, and an image projection method capable of changing an image to be projected in accordance with a change in the projection direction of the projector. To do.

In order to solve the above problems, the present invention includes a projector and an image supply device that supplies image data representing an image to the projector, the projector including a projecting unit that projects the image onto a projection surface, The image supply device includes a range detection unit that obtains a projected range from a whole image having a resolution larger than a resolution that can be projected by the projection unit based on a positional relationship between the projection plane and a projection range by the projection unit. And an image extraction unit that extracts the range obtained by the range detection unit from the entire image and supplies the range as the image data to the projector.
According to the present invention, based on the positional relationship between the projection range of the projector and the projection surface, a part is extracted from the entire image having a resolution larger than the resolution that the projector can project, and is projected onto the projection surface by the projector. As a result, a part of the entire image is extracted and reflected by reflecting the projection direction of the projector and the position of the projector, so that the projection direction of the projector and the position of the projector are reflected in the projected image. Therefore, the image to be projected can be changed in accordance with the change in the projection direction of the projector, and a vast image can be projected using a projection surface larger than the projection range.

In the projection system according to the aspect of the invention, the range detection unit included in the image supply device may be newly updated to follow the change when the relative position between the projection surface and the projection range by the projection unit changes. The range is obtained.
According to the present invention, when the projection range of the projector moves with respect to the projection surface, the projected range of the entire image moves in accordance with this movement. Thereby, a vast image can be projected using a projection surface larger than the projection range of the projector.

In the projection system according to the aspect of the invention, the projector may include a projection direction changing unit that changes the direction of the projection unit, and a projection direction detection unit that detects the direction of the projection unit with reference to the projector body. The range detection means included in the image supply device is characterized in that when the direction of the projection means detected by the projection direction detection means is changed, the range is newly obtained following the change. .
According to the present invention, since the change in the projection direction of the projector can be detected easily and accurately, the projected range of the entire image can be accurately moved in accordance with the movement of the projection range. Thereby, the projection image can be changed by accurately reflecting the movement of the projection range.

In the projection system according to the invention, the projection surface is a flat surface or a curved surface.
According to the present invention, it is possible to project a vast image using a large projection surface constituted by a flat surface or a curved surface.

Moreover, in order to solve the said subject, this invention is an image supply apparatus which supplies the image data showing the said image to the projector which projects an image on a projection surface, Comprising: The position of the said projection surface and the projection range of the said projector Based on the relationship, from the entire image having a resolution larger than the resolution that can be projected by the projector, the range detection means for obtaining the projected range, and the range obtained by the range detection means from the entire image, Image extracting means for supplying image data to the projector is provided.
According to the present invention, according to the present invention, based on the positional relationship between the projection range of the projector and the projection surface, a part is extracted from the entire image having a resolution larger than the resolution that the projector can project, and By outputting, it can be projected on the projection surface. Thus, by extracting and projecting a part of the entire image reflecting the projection direction of the projector and the position of the projector, the projected image can be changed according to the change in the projection direction of the projector, and the projection range A vast image can be projected using a larger projection surface.

Moreover, in order to solve the said subject, this invention is the resolution which the said projection means can project based on the projection means which projects an image on a projection surface, and the positional relationship of the projection range by the said projection surface and the said projection means. Range detection means for obtaining a projected range from a whole image having a larger resolution, image extraction means for extracting a range obtained by the range detection means from the whole image, and the image extracted by the image extraction means Projection control means for projecting the image by the projection means.
According to the present invention, a projector that projects an image extracts a part from an entire image having a resolution larger than the resolution that can be projected based on the positional relationship between the projection range of the projector and the projection surface, and the projector Since the projection is performed on the projection surface, the projection direction of the projector and the position of the projector can be reflected in the projected image. Thereby, a vast image can be projected using a projection surface larger than the projection range.

Moreover, in order to solve the said subject, this invention is an image projection method by the projector which projects an image on a projection surface, Comprising: The said projector is based on the positional relationship of the said projection surface and the projection range of the said projector. A range to be projected is obtained from an entire image having a resolution larger than a resolution that can be projected, the obtained range is extracted from the entire image, and the extracted range is projected by the projector.
According to the method of the present invention, since the projection direction and position of the projector can be reflected in the image projected by the projector, a large projection surface is used and a vastness having a resolution larger than the resolution that can be projected. An image can be projected.

  According to the present invention, since the positional relationship between the projection plane and the projection range is reflected in the image projected on the projection plane, a large image having a resolution larger than the resolution that can be projected using a large projection plane. Can be projected.

It is a figure which shows the example of schematic structure and the display aspect of the projection system which concerns on embodiment to which this invention is applied. It is a block diagram which shows the functional structure of a projector and PC. It is a figure which shows the projection image on the screen in a variation | change_quantity detection process, (A) shows an initial state, (B) and (C) show the state after operation | movement of a rotation part and a horizontal rotation part. It is a flowchart which shows operation | movement of a projection system, and shows change amount detection processing. It is a flowchart which shows operation | movement of a projection system, and shows operation | movement which projects the image data which PC has. It is a figure which shows the structure of the 1st modification of a projection system. It is a figure which shows the structure of the 2nd modification of a projection system. It is a block diagram which shows the structure of the 3rd modification of a projection system. It is a figure which shows the structure of the 4th modification of a projection system. It is a figure which shows the structure of the 5th modification of a projection system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a schematic configuration of a projection system 10 to which the present invention is applied. The projection system 10 includes a projector 11 and a PC (Personal Computer) 2 as an image supply device that supplies image data representing an image to the projector 11. As will be described later, the PC 2 and the projector 11 according to the present embodiment are wiredly connected by a communication cable that transmits and receives image data and a communication cable that transmits and receives control data. Communication between the PC 2 and the projector 11 can be performed in accordance with a known communication standard such as USB (Universal Serial Bus), IEEE1394, or LAN, and image data and control data are transmitted and received by a single communication cable. It is also possible.

  The projector 11 is a device that projects (displays) an image on a screen SC as a projection surface. The projector 11 has a substantially box-shaped main body 15, and a rotating portion 16 that can rotate in a direction perpendicular to the installation surface of the projector 11 is provided at the front of the main body 15. A horizontal rotation unit 17 is erected on the upper surface of the rotation unit 16, and a projection optical system 33 (FIG. 2) that projects an image onto the screen SC is accommodated in the horizontal rotation unit 17. The image projected by the modulation device 32 forms an image in the projection range 100 on the screen SC. The rotation unit 16 can be rotated up and down as indicated by reference numeral V in the drawing, and the projection direction of the projection optical system 33 changes in the elevation direction as the rotation unit 16 rotates. By the operation of the rotating unit 16, the projection range 100 moves up and down as indicated by arrows on the screen SC. Moreover, the horizontal rotation part 17 can be rotated in the horizontal direction with respect to the main body 15 as indicated by a symbol H in the figure, and the projection range 100 moves to the left and right as the horizontal rotation part 17 operates.

  The screen SC is a larger plane than the projection range 100 of the projector 11, and the wall surface of the room itself can be used as the screen SC. In the present embodiment, a screen SC having a rectangular projectable area that is erected substantially upright is illustrated. The PC 2 has image data for projecting an image larger than the projection range 100. This image data is image data having a number of pixels several times or more than the display resolution (number of pixels) of the projector 11. Since the resolution of the image data is larger than the display resolution of the projector 11, the projector 11 does not reduce the image data and does not perform resolution conversion corresponding to the reduction (in other words, the resolution of the image data is maintained). If the entire image represented by the image data is to be displayed), the projector 11 cannot display the entire image data and can only display a part of the image data. A part of this image corresponds to an image displayed in the projection range 100. The projection range 200 indicated by a broken line in FIG. 1 assumes that the projector 11 can project the entire image corresponding to the image data at the same magnification as when the image included in the projection range 100 is projected. In this case, it is an area where the entire image is estimated to be projected. Since the projection range 100 that can be actually projected by the projector 11 is smaller than the projection range 200, the PC 2 extracts a range corresponding to the projection range 100 from the image data and outputs it to the projector 11. The resolution of the image data extracted by the PC 2 is, for example, a resolution that substantially matches the display resolution of the projector 11 when the projector 11 projects without performing processing such as image data reduction or resolution conversion. The image data supplied from the PC 2 to the projector 11 may be a moving image or a still image.

FIG. 2 is a block diagram showing a functional configuration of the projection system 10.
The projector 11 is connected to an external image supply device including the PC 2 and includes an I / F (interface) 101 to which digital image data or an analog image signal is input. As described above, the I / F 101 is a composite of USB interface, wired or wireless LAN interface, VGA terminal to which an analog video signal is input, DVI (Digital Visual Interface) to which a digital video signal is input, NTSC, PAL, SECAM, and the like. An S video terminal to which a video signal is input, an RCA terminal to which a composite video signal is input, a D terminal to which a component video signal is input, an HDMI connector compliant with the HDMI (registered trademark) standard, and these terminals and connectors Interface circuit for inputting / outputting signals via the interface.

  The projector 11 is roughly composed of a projection unit 3 (projection means) that forms an optical image and an image processing system that electrically processes an image signal input to the projection unit 3. The projection unit 3 includes an illumination optical system 31, a light modulation device 32 including a liquid crystal panel and the like, and a projection optical system 33. The illumination optical system 31 includes a light source including a xenon lamp, an ultra high pressure mercury lamp, an LED (Light Emitting Diode), and the like. Further, the illumination optical system 31 may include a reflector for guiding the light emitted from the light source to the light modulation device 32 and an auxiliary reflector, and includes a lens group (not shown), a polarizing plate, Or you may provide the light control element etc. which reduce the light quantity of the light which the light source emitted on the path | route which reaches the light modulation apparatus 32. FIG.

  The light modulation device 32 includes, for example, a transmissive liquid crystal panel, and forms an image on the liquid crystal panel upon receiving a signal from an image processing system described later. In this case, the light modulation device 32 includes three liquid crystal panels corresponding to the three primary colors of RGB in order to perform color projection, and the light from the illumination optical system 31 is separated into three color lights of RGB. Enters each corresponding liquid crystal panel. The color light modulated by passing through each liquid crystal panel is combined by a combining optical system such as a cross dichroic prism and emitted to the projection optical system 33.

  The light modulation device 32 is not limited to a configuration using three transmissive liquid crystal panels, and for example, three reflective liquid crystal panels can be used, and one liquid crystal panel and a color wheel can be used. A combination system, a system using three digital mirror devices (DMD), a system combining one digital mirror device and a color wheel, or the like may be used. Here, when only one liquid crystal panel or DMD is used as the light modulation device 32, a member corresponding to a composite optical system such as a cross dichroic prism is unnecessary. In addition to the liquid crystal panel and the DMD, any configuration that can modulate the light emitted from the light source can be used without any problem.

The projection optical system 33 includes a zoom lens that performs enlargement / reduction of a projected image and a focus adjustment, a zoom adjustment motor that adjusts the degree of zoom, a focus adjustment motor that performs focus adjustment, and the like. The projection optical system 33 projects the incident light modulated by the light modulator 32 on the screen SC using a zoom lens.
The projection unit 3 includes a projection optical system drive unit 121 that drives each motor included in the projection optical system 33 according to the control of the control unit 103, and a light source drive that drives a light source included in the illumination optical system 31 according to the control of the control unit 103. The unit 117 is connected.

  The image processing system is configured around a control unit 103 that controls the entire projector 11 in an integrated manner, a storage unit 105 that stores data processed by the control unit 103 and a control program 105A executed by the control unit 103, and an operation panel 45. And an input processing unit 123 that detects an operation via the remote control light receiving unit 41, an image processing unit 113 that processes an input image input from the I / F 101, and light based on an image signal output from the image processing unit 113. An optical modulation device driving unit 119 that performs drawing by driving the modulation device 32 is provided.

  The control unit 103 reads out and executes the control program 105 </ b> A stored in the storage unit 105, thereby controlling each unit of the projector 11. The control unit 103 detects the content of the operation performed by the user based on the operation signal input from the input processing unit 123, and in response to this operation, the image processing unit 113, the light modulation device driving unit 119, and the projection optical system. The driving unit 121 and the light source driving unit 117 are controlled to cause the projection unit 3 to project an image on the screen SC.

On the main body 15 of the projector 11, an operation panel 45 including various switches and indicator lamps that are operated by the user is disposed. The operation panel 45 is connected to the input processing unit 123, and the input processing unit 123 turns on or blinks the indicator lamp of the operation panel 45 as appropriate according to the operation state and setting state of the projector 11 according to the control of the control unit 103. . When the switch of the operation panel 45 is operated, an operation signal corresponding to the operated switch is output from the input processing unit 123 to the control unit 103.
The projector 11 has a remote controller (not shown) used by the user. The remote control includes various buttons, and transmits an infrared signal corresponding to the operation of these buttons. The main body of the projector 11 is provided with a remote control light receiving unit 41 that receives an infrared signal emitted from the remote control. The remote control light receiving unit 41 decodes the infrared signal received from the remote control, generates an operation signal indicating the operation content on the remote control, and outputs the operation signal to the control unit 103.

An image processing unit 113 is connected to the I / F 101. The image processing unit 113 acquires an analog image signal or image data input from the PC 2 or another image supply device, determines whether the analog image signal is digital image data, and identifies the data format of the digital image data. The image processing unit 113 has a function of A / D converting the analog input signal and outputting a digital signal when an analog image signal is input from an external image supply device. Further, the image processing unit 113 performs a resolution conversion process for converting the image data of the input image into data having a resolution that conforms to the specifications of the liquid crystal panel of the light modulation device 32, and the like. The image is developed in the frame memory 115, and the developed display image is output to the light modulator driving unit 119. The light modulation device driving unit 119 drives the light modulation device 32 based on the display image input from the image processing unit 113. Thus, an image is drawn on the light modulation device 32 under the control of the control unit 103, and this image is projected as a projection image on the screen SC via the projection optical system 33.
In the present embodiment, the image data extracted from the image data 22B is input from the PC 2 in accordance with the resolution of the liquid crystal display panel of the light modulation device 32. Therefore, the image processing unit 113 does not perform resolution conversion and reduction processing. Then, the image is developed in the frame memory 115.

  The control unit 103 functions as the display control unit 103A by executing the control program 105A. The display control unit 103A (display control unit) controls the image processing unit 113 so that the image processing unit 113 develops an image in the frame memory 115 based on the image data input to the I / F 101, and the light modulation device. The drive unit 119 is controlled so that the image developed in the frame memory 115 is drawn on the liquid crystal panel of the light modulation device 32 and is projected by the projection unit 3.

Further, the projector 11 rotates the rotation unit 16 (FIG. 1) as a drive source that rotates the horizontal rotation unit 17 (FIG. 1) in the horizontal direction while rotating the rotation unit 16 (FIG. 1) in the vertical direction. A unit 125 (projection direction changing means), and an angle detection unit 127 (projection direction detection means) that detects angles of the rotation unit 16 and the horizontal rotation unit 17 rotated by the rotation operation unit 125. The angle detection unit 127 detects angles of the rotation unit 16 and the horizontal rotation unit 17 with respect to the main body 15. The angle detected by the angle detector 127 is based on a state in which the main body 15 is installed in front of the screen SC and the front surface of the main body 15 faces the screen SC. In this reference state, the rotation unit 16 and the horizontal rotation unit 17 are in a position where the projection unit 3 projects the screen SC from the front. In the following operation, the main body 15 is not moved and the direction is not changed.
The rotation operation unit 125 is configured using a motor, a speed reducer, or the like (not shown), and can individually rotate the rotation unit 16 and the horizontal rotation unit 17 in accordance with control of a drive control unit 103B described later. . An angle detection unit 127 composed of a rotary encoder or the like is attached to the rotation operation unit 125, and the angle detection unit 127 detects the rotation angle from the reference position for each of the rotation unit 16 and the horizontal rotation unit 17. The detected value is output to the control unit 103.

The control unit 103 functions as the drive control unit 103B by executing the control program 105A.
When the drive control unit 103B is instructed to change the angle of the rotation unit 16 or the horizontal rotation unit 17 by an operation of the remote controller or the operation panel 45, the drive control unit 103B performs the rotation of the rotation unit 16 and the horizontal rotation unit 17 according to the instruction. The rotation amount (angle) is determined for each, the rotation operation unit 125 is operated, the detection value input from the angle detection unit 127 is acquired, and the rotation unit 16 or the horizontal rotation unit 17 has reached the target position. By the way, the rotation operation unit 125 is stopped.

A communication unit 47 is connected to the control unit 103. The communication unit 47 is wired to the PC 2 via the communication cable described above, and transmits / receives control data to / from the PC 2 under the control of the control unit 103. The control unit 103 functions as the communication control unit 103C by executing the control program 105A, and transmits control data indicating the detection value input from the angle detection unit 127 to the PC 2 in response to a request from the PC 2.
In addition, the communication control unit 103C receives the control data when the control data for instructing the operation of rotating the rotation unit 16 or the horizontal rotation unit 17 is transmitted from the PC 2, and receives an instruction based on the control data. Is output to the drive control unit 103B. The drive control unit 103B drives the rotation operation unit 125 as described above in accordance with this instruction.

  An imaging unit 48 that captures the screen SC is connected to the control unit 103. As shown in FIG. 1, the imaging unit 48 is a digital still camera that is provided on the front side of the main body 15 and shoots a direction facing the front surface of the main body 15. The imaging unit 48 is fixed to the main body 15, and the shooting direction is not changed by the operations of the rotating unit 16 and the horizontal rotating unit 17. The imaging field angle of the imaging unit 48 is at least larger than the projection range 100, and preferably includes a projection range on the screen SC.

The PC 2 includes a CPU, a ROM, a RAM, and the like, and includes a control unit 21 that controls each unit of the PC 2. A storage unit 22 including a magnetic recording medium and a semiconductor storage element is connected to the control unit 21, and the control unit 21 reads and executes the control program 22 </ b> A stored in the storage unit 22, thereby Implement various functions.
An input unit 23 having an input device such as a keyboard and a mouse is also connected to the control unit 21. The input unit 23 detects an operation on each input device and outputs the operation content to the control unit 21. The control unit 21 is connected to an image output unit 24 that generates display image data in accordance with the control of the control unit 21. A display unit 25 having a monitor (not shown) is connected to the image output unit 24 to generate image data for displaying the image processed by the control unit 21 and the processing result on the monitor, and the display unit To 25. The display unit 25 generates a display signal based on the image data input from the image output unit 24, drives the monitor based on the display signal, and executes display. Further, when the control unit 21 instructs the control unit 21 to extract and display a part of the image data 22B stored in the storage unit 22, the image output unit 24 extracts the specified part and displays it. Image data is generated and output to the I / F 101 of the projector 11.

In addition, a communication unit 26 is connected to the control unit 21. The communication unit 26 is communicably connected to the communication unit 47 of the projector 11, and transmits / receives various data to / from the communication unit 47. The communication unit 26 transmits control data instructing the projector 11 to detect a change amount and start projection according to the control of the control unit 21, and receives control data transmitted from the projector 11.
The control unit 21 functions as the communication control unit 21A by executing the control program 22A, generates control data to be transmitted to the projector 11, and causes the communication unit 26 to transmit the control data. In addition, the communication control unit 21A acquires and analyzes the control data received by the communication unit 26. For example, when control data indicating the angle of the rotation unit 16 or the horizontal rotation unit 17 detected by the angle detection unit 127 by the drive control unit 103B of the projector 11 is transmitted, the communication control unit 21A communicates the control data. The angle is received by the unit 26 and analyzed, and the angle of the rotation unit 16 or the horizontal rotation unit 17 is acquired.

In addition to the control program 22A, the storage unit 22 is used in change amount detection processing for detecting change amounts of the image data 22B (overall image) projected by the projector 11 and the projection range 100 (FIG. 1) of the projector 11. Test image data 22C, change amount data 22D obtained by the change amount detection process, and projection direction data 22E indicating the current projection direction of the projector 11 are stored.
The image data 22B is image data suitable for being projected onto the projection range 200 (FIG. 1) as described above. The image data 22B is, for example, image data composed of pixels more than several times the display resolution of the projector 11, that is, the number of pixels in the projection range 100 (the number of pixels in the liquid crystal panel of the light modulation device 32). Or image data projected on a wide area such as the projection range 200 when projected without resolution conversion. The storage unit 22 may store a plurality of image data 22B. The resolution of the image data 22B is not particularly limited as long as it is larger than the resolution of the liquid crystal display panel of the light modulation device 32. For example, when the entire image data 22B is projected, the projection range 200 may be smaller than the screen SC.

The control unit 21 functions as the image acquisition unit 21B by executing the control program 22A. The image acquisition unit 21B selects and reads the designated image data 22B from the image data 22B stored in the storage unit 22 in accordance with the operation content input from the input unit 23.
In addition, the control unit 21 functions as the change amount detection unit 21C by executing the control program 22A. When the projection range 100 is moved by rotating the rotation unit 16 and / or the horizontal rotation unit 17, the change amount detection unit 21 </ b> C and a rotation unit corresponding to the movement amount of the projection range 100. 16 and / or change amount detection processing for obtaining a correspondence relationship with the rotation amount of the horizontal rotation unit 17.

  The test image data 22 </ b> C is image data having a resolution corresponding to the projection range 100 of the projector 11, that is, a resolution substantially equal to the display resolution of the projector 11, and the aspect ratio also corresponds to the projection range 100. The test image data 22C is, for example, a rectangular image in accordance with the displayable area of the liquid crystal display panel of the light modulation device 32. Further, the test image data 22C has a geometric pattern such as an image in which dark squares are arranged at the four corners and the other parts are configured with light colors so that the four corners can be easily identified from the other parts. It is good also as an image which has.

3A and 3B are diagrams showing a projected image on the screen SC in the change amount detection process. FIG. 3A shows an initial state, and FIGS. 3B and 3C show the rotation unit 16 and / or the horizontal rotation unit 17. The state after the operation is shown.
In the change amount detection process, the image acquisition unit 21B acquires the test image data 22C from the storage unit 22, and the communication control unit 21A transmits control data to instruct the projection of the test image data 22C to the projector 11. According to this control data, the display control unit 103A of the projector 11 projects an image corresponding to the test image data 22C onto the screen SC. FIG. 3A shows an initial state in which the projector 11 projects an image, and the four corners of the projection range 100 are apexes 100A, 100B, 100C, and 100D.

  Further, the change amount detection unit 21C of the PC 2 instructs the projector 11 to rotate the rotation unit 16 and / or the horizontal rotation unit 17, and the imaging unit 48 takes an image every predetermined time before the rotation starts. And instruct to transmit the captured image data. These instructions are transmitted to the projector 11 as control data. The drive control unit 103B of the projector 11 performs an operation of rotating the rotating unit 16 and / or the horizontal rotating unit 17 according to the control data, and periodically performs imaging by the imaging unit 48 immediately before the start of the operation, The captured image data is transmitted to the PC 2. The imaging cycle may be a cycle specified by control data transmitted from the PC 2 or may be a cycle preset in the projector 11.

The change amount detection unit 21C acquires captured image data from the projector 11, and detects the positions of the four corners of the projection range 100 in the captured image data. Then, when the projection range 100 moves by a length corresponding to the width of the projection range 100 due to the rotation of the rotation unit 16 and / or the horizontal rotation unit 17, the control data is transmitted to the projector 11 to rotate. The rotation of the part 16 and / or the horizontal rotation part 17 is stopped.
FIG. 3B shows an example in which the projection range 100 is moved by a length corresponding to the width of the projection range 100 in the horizontal direction. The positions of the vertices 100C and 100D of the projection range 100 before the movement are represented as vertices 100C ′ and 100D ′. In the example of FIG. 3B, the horizontal rotation unit 17 (FIG. 1) of the projector 11 rotates to move the projection range 100 horizontally on the screen SC, and the vertexes 100C ′, 100D ′ and 100B, 100A. And overlap. For example, when the number of pixels of the test image data 22C displayed in the projection range 100 is horizontal X pixels × vertical Y pixels, when the state shown in FIG. 3A changes to the state shown in FIG. The rotating unit 17 is rotated by X pixels in the horizontal direction.

The change amount detection unit 21C transmits control data to the projector 11 and transmits the angle of the horizontal rotation unit 17 detected by the angle detection unit 127 or the rotation amount of the horizontal rotation unit 17 before and after the rotation. To instruct. When the communication control unit 103C of the projector 11 transmits the detection value or the rotation amount of the angle detection unit 127 according to this instruction, the change amount detection unit 21C is based on the transmitted detection value or rotation amount of the angle detection unit 127. Then, the correspondence between the amount of rotation of the horizontal rotation unit 17 and the number of moving pixels is calculated.
That is, when the horizontal rotation unit 17 rotates RX degrees in the change from FIG. 3A to FIG. 3B, the number of pixels per one degree of rotation of the horizontal rotation unit 17 is calculated by X ÷ RX. Is required. Similarly, the rotation amount per pixel can be obtained by calculating RX ÷ X.

FIG. 3C shows an example in which the projection range 100 moves in the horizontal direction by a length corresponding to the width of the projection range 100 and moves in the vertical direction by a length corresponding to the height of the projection range 100. Indicates. In the example of FIG. 3C, the rotation unit 16 and the horizontal rotation unit 17 of the projector 11 rotate, the projection range 100 moves horizontally and vertically on the screen SC, and the vertices 100C ′ and 100A become This is an example of overlapping.
In this case, the horizontal rotation unit 17 is rotated by X pixels in the horizontal direction, and the rotation unit 16 is rotated by Y pixels in the vertical direction. Here, when the rotation amount of the rotation unit 16 detected by using the angle detection unit 127 in the change of FIGS. 3A to 3C is RY degrees, and the rotation amount of the horizontal rotation unit 17 is RX degrees, The number of pixels per degree of rotation of the rotation unit 16 is obtained by calculation of Y ÷ RY, and the number of pixels per degree of rotation of the horizontal rotation unit 17 is obtained by calculation of X ÷ RX. Similarly, the amount of rotation per pixel can be obtained by calculating RY ÷ Y.
As described above, the control unit 21 obtains the ratio between the rotation amounts of the rotation unit 16 and the horizontal rotation unit 17 of the projector 11 and the number of pixels of the image data output from the PC 2 to the projector 11. And / or when the horizontal rotation part 17 rotates, the pixel number corresponding to the rotation amount can be calculated | required.

FIG. 4 is a flowchart showing change amount detection executed by the control unit 21.
The PC 2 starts the change amount detection process according to the operation of the input device or the like (step S11), the image acquisition unit 21B acquires the test image data 22C from the storage unit 22, and the image output unit 24 obtains the test image data 22C from the projector 11. To output. At the same time, the image acquisition unit 21 </ b> B transmits control data instructing image projection to the projector 11 via the communication unit 26. Thereby, the test image data 22C is projected onto the screen SC by the projector 11 (step S12).
Here, the change amount detection unit 21C transmits control data for instructing the projector 11 to execute shooting and transmit the shot image, and the projector 11 performs the first shooting by the imaging unit 48 according to the control data, The captured image data is transmitted to the PC 2 (step S13).

The change amount detection unit 21C transmits control data instructing the rotation of the rotation unit 16 and / or the horizontal rotation unit 17 to the projector 11, and the projector 11 is rotated by the rotation operation unit 125 according to the control data. The moving unit 16 and / or the horizontal rotating unit 17 is rotated (step S14). The change amount detection unit 21C operates the horizontal rotation unit 17 when detecting the change amount with respect to the horizontal movement of the projection range 100, and rotates when detecting the change amount with respect to the vertical movement of the projection range 100. The unit 16 is operated.
The control unit 103 of the projector 11 performs the second and subsequent shootings at a cycle designated by the control data received in step S13 or in advance. That is, the imaging unit 48 is controlled to perform imaging, and the captured image data is transmitted to the PC 2 (step S15).
The change amount detection unit 21C of the PC 2 compares the captured image data received from the projector 11 with the first captured image data received in step S13, and the projection range 100 is shown in FIGS. 3B and 3C. As described above, it is determined whether or not a position adjacent to the projection range 100 in the initial state has been reached (step S16).

When the projection range 100 has not reached the position adjacent to the projection range 100 in the initial state (step S16; No), the change amount detection unit 21C returns to step S14, and further includes the rotation unit 16 and the horizontal rotation unit 17. Rotate. Thereby, the projector 11 repeatedly performs the operation of rotating the rotating unit 16 and the horizontal rotating unit 17 according to the imaging cycle.
On the other hand, when the projection range 100 reaches a position adjacent to the projection range 100 in the initial state (step S16; Yes), the change amount detection unit 21C includes the pixel of the test image data 22C, the rotation unit 16, and the horizontal rotation unit. A ratio with the rotation amount of 17 is obtained (step S17).
The ratio of the pixels obtained by the above change amount detection processing and the rotation amounts of the rotation unit 16 and the horizontal rotation unit 17 is stored in the storage unit 22 as change amount data 22D.

As shown in FIG. 2, the control unit 21 functions as a range detection unit 21D and an extraction unit 21E by executing a control program 22A. The range detection unit 21D (range detection unit) detects a range projected by the projector 11 from the image data 22B acquired from the storage unit 22 by the image acquisition unit 21B. The range detection unit 21D performs processing for obtaining a range to be extracted in order to extract a range suitable for the projection direction of the current projector 11 from the image data 22B.
The range detection unit 21D sets the projection direction of the projector 11 at the start of image projection as being located at the center of the image data 22B, that is, the center of the projection range 200. This setting is convenient and can be changed. For example, it may be set by operating the input device of the PC 2 or the operation panel 45 of the projector 11.
When the rotation unit 16 and / or the horizontal rotation unit 17 is driven by the rotation operation unit 125 and the projection direction changes, the range detection unit 21D is based on the detection value of the angle detection unit 127 input from the projector 11. The amount of rotation of each of the rotation unit 16 and the horizontal rotation unit 17 is obtained. Furthermore, the range detection unit 21D calculates the number of pixels corresponding to the rotation amount of the rotation unit 16 and the horizontal rotation unit 17, and moves the range to be output to the projector 11 by the calculated number of pixels.

The extraction unit 21E (image extraction unit) extracts the range detected by the range detection unit 21D from the image data 22B acquired by the image acquisition unit 21B, and uses the extracted image data as display image data. 24 to the projector 11.
When the rotation unit 16 and the horizontal rotation unit 17 of the projector 11 are rotated by the operations of the range detection unit 21D and the extraction unit 21E, the projection is performed on the projection range 100 in the image data 22B corresponding to the rotation amount. Range changes. Accordingly, an image at a position corresponding to the projection range 100 in the large projection range 200 is projected onto the screen SC. Therefore, the entire image data 22B can be viewed by moving the projection range 100 of the projector 11. .

FIG. 5 is a flowchart showing the operation of the projection system 10, and particularly shows the operation of projecting the image data 22B that the PC 2 has.
The PC 2 starts change amount detection processing according to the operation of the input device or the like (step S21), and sets the current projection direction of the projector 11 and the position of the projection range 100 as initial values (step S22). Thereafter, when the projector 11 rotates the rotation unit 16 and the horizontal rotation unit 17, the positions of the rotation unit 16 and the horizontal rotation unit 17 are detected based on the rotation amount from the initial value on the basis of the initial value. Is done.
The image acquisition unit 21B of the PC 2 acquires the image data 22B from the storage unit 22, the range detection unit 21D detects a range corresponding to the initial value in the image data 22B, and the extraction unit 21E extracts a part of the image data 22B. (Step S23). Next, the extraction unit 21E outputs image data in the extracted range to the projector 11 by the image output unit 24 (step S24), and the projector 11 causes the projection unit 3 to screen the image data input from the PC 2 to the I / F 101. Projecting onto the SC (step S25).

Here, the control unit 103 of the projector 11 responds to an instruction when the rotation of the rotation unit 16 and / or the horizontal rotation unit 17 is instructed by an operation of the operation panel 45 or a remote controller (not shown). Then, the rotation operation unit 125 is driven. At this time, the control unit 103 outputs the detection value of the angle detection unit 127 to the PC 2 every time the rotation unit 16 and / or the horizontal rotation unit 17 rotates a predetermined amount or every predetermined time. The change amount detection unit 21C determines whether or not the projection direction has changed based on the detection value of the angle detection unit 127 (step S26). This determination is performed based on, for example, whether the rotation amount from the initial value exceeds a threshold value based on the detection value of the angle detection unit 127.
When it is determined that there is no change in the projection direction (step S26; No), the change amount detection unit 21C determines whether or not to end the projection (step S29), and when the projection is not ended (step S29; No). ), Returning to step S26, the projection is continued.

  On the other hand, when it is determined that there has been a change in the projection direction (step S26; Yes), the change amount detection unit 21C calculates a change amount from the initial value (step S27), and based on the calculated change amount. The range newly extracted by the range detector 21D is detected and updated (step S28). Thereafter, returning to step S23, the extraction unit 21E extracts image data according to the updated range, and the extracted image data is projected onto the screen SC. Further, in the processes of steps S23 to S26 that are repeatedly executed thereafter, the projection direction at the time when the projection range is updated is reset as an initial value. Thereby, the extraction range is updated every time the rotation amount of the rotation unit 16 and / or the horizontal rotation unit 17 exceeds the threshold value.

  As described above, the projection system 10 according to the embodiment to which the present invention is applied includes the projector 11 and the PC 2 that supplies image data to the projector 11, and the projector 11 projects the image onto the screen SC. 3, the PC 2 detects the range to be projected from the image data 22 </ b> B having a resolution larger than the resolution that the projection unit 3 can project based on the positional relationship between the screen SC and the projection range by the projection unit 3. A section 21D, and an extraction section 21E that extracts the range obtained by the range detection section 21D from the image data 22B and supplies it to the projector 11 as image data. The resolution is higher than the resolution that the projector 11 can project into the projection range 100. A portion of the image data 22B having the Since morphism, and projects to extract a portion of the image data 22B to reflect the position of the projection direction and the projector 11 of the projector 11. Thereby, the image projected on the screen SC can be changed in accordance with the change in the projection direction of the projector 11, and a vast image corresponding to the projection range 200 can be obtained using the screen SC larger than the projection range 100. Can project.

  In addition, when the relative position between the rotation unit 16 and / or the screen SC and the projection range by the projection unit 3 changes, the range detection unit 21D newly obtains a range following this change, and thus the projection range 100 The projected range of the image data 22B can be moved in accordance with the movement of the image data 22B. Therefore, a large image corresponding to the projection range 200 can be viewed by the projector 11 that can project only the projection range 100 by the operations of the rotation unit 16 and the horizontal rotation unit 17.

  The projector 11 rotates the rotation unit 16 and the horizontal rotation unit 17 to change the direction of the projection unit 3, and the rotation operation unit 125 that moves the projection range 100, and the projection unit 3 on the basis of the main body of the projector 11. An angle detection unit 127 that detects a change in direction, that is, a movement of the projection range 100, and the range detection unit 21 </ b> D obtains a new range following the change when the direction of the projection unit 3 changes. In accordance with the movement of the range 100, the projected range of the image data 22B can be accurately moved.

  Hereinafter, modifications of the present embodiment will be described. In the description of the modification, the same components as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted.

[Modification 1]
FIG. 6 is a diagram showing a configuration of the first modification.
The projector 11 according to the embodiment includes the rotation unit 16 and the horizontal rotation unit 17 that rotate with respect to the main body 15, and the angle detection unit 127 detects the rotation amounts of the rotation unit 16 and the horizontal rotation unit 17. It was the composition to do. In this modification, another example of a configuration for moving the projection range 100 will be described.
A projector 11A shown in FIG. 6 has a box-shaped main body 15A similar to the projector 11. Similar to the rotation unit 16, a rotation unit 16A that can be rotated up and down is provided at the front of the main body 15A, and the projection unit 3 is mounted on the rotation unit 16A. Has been. For this reason, the projection range 100 moves up and down by the operation of the rotating unit 16A.
The bottom surface of the main body 15A is placed on the base portion 15B. The flat base portion 15B is placed on the installation surface, and the main body 15A is rotatably mounted on the base portion 15B. The connecting portion between the main body 15A and the base portion 15B supports, for example, the main body 15A so as to be rotatable from below by a shaft (not shown) erected on the base portion 15B, and rotates the main body 15A around this axis. And a motor (not shown) to be configured. Therefore, the main body 15A is rotated in a horizontal plane as indicated by a symbol H in the figure with respect to the base portion 15B by the power of a motor (not shown).

  Similar to the angle detection unit 127, a detection unit that detects an angle from the reference position is provided in the connection unit between the rotation unit 16A and the main unit 15A and the connection unit between the main unit 15A and the base unit 15B. The projector 11A outputs the detection value of the detection unit to a device such as the PC 2 (FIG. 1), and the PC 2 can detect the movement of the projection range 100 in the horizontal direction and the vertical direction based on the detection value. Accordingly, even when the projection system 10 is configured using the projector 11A instead of the projector 11, the projection system 10 can perform projection by changing the projected image following the movement of the projection range 100, and the user can perform projection. The entire image data 22B can be viewed.

[Modification 2]
FIG. 7 is a diagram illustrating a configuration of the second modification.
The projector 11B shown in this modification has a box-shaped main body 15C. The main body 15C is configured such that the projection unit 3 emits projection light from the front surface thereof, and the projection unit 3 is fixed to the main body 15C. For this reason, the projection range 100 projected by the projector 11B on the screen SC can be moved up, down, left, and right by moving the main body 15C in the directions indicated by the symbols V and H in the drawing.

A position detection device 50 is installed in the vicinity of the projector 11B. The position detection device 50 includes a detection mechanism that detects movement of the main body 15C from the reference position and change in orientation. The position detection device 50 performs wireless communication with the communication unit 47 of the projector 11B, and transmits the movement amount and the change amount of the direction detected by the detection mechanism to the projector 11B. The detection mechanism provided in the position detection device 50 performs, for example, wireless communication with the communication unit 47 provided in the projector 11B, and detects the relative position between the main body 15C and the position detection device 50 based on the radio wave intensity. It is. In addition, the detection mechanism includes a plurality of transmitters (not shown) that transmit radio signals to the main body 15C, receives radio signals emitted by the plurality of transmitters, and determines the amount of movement and direction change of the main body 15C. A mechanism for detecting, or a mechanism for photographing the main body 15C and detecting movement and orientation change of the main body 15C based on the photographed image can be used.
The projector 11B outputs the amount of movement and orientation change of the main body 15C transmitted from the position detection device 50 to a device such as the PC 2 (FIG. 1), and the PC 2 outputs the projection range 100 based on these values. Movement in the horizontal and vertical directions can be detected. Therefore, even when the projection system 10 is configured using the projector 11B instead of the projector 11, the projection system 10 can perform projection by changing the projection image following the movement of the projection range 100, and the user can The entire image data 22B can be viewed.

[Modification 3]
FIG. 8 is a diagram showing a configuration of the third modification, and is a functional block diagram of a projector 11C according to the third modification. FIG. 8 shows the functional blocks of the PC 2 together.
The projector 11C shown in the third modified example has the same configuration as the projector 11, but does not include the rotation operation unit 125 and the angle detection unit 127. That is, similarly to the projector 11B (FIG. 7), the projector 11C does not have a movable part such as the rotating part 16 and the horizontal rotating part 17 in the main body.

The projector 11C includes a sensor unit 129 including various sensors that detect the movement and tilt of the projector 11C main body.
The sensor unit 129 includes an acceleration sensor that detects the movement of the main body of the projector 11C, a gyro sensor that detects the orientation of the main body of the projector 11C, and the like, and outputs detection values of these sensors to the control unit 103. The control unit 103 detects the movement of the main body of the projector 11 </ b> C and a change in the direction based on the detection values of the sensors input from the sensor unit 129. The projector 11C outputs this detection result to the PC 2, and the PC 2 can detect the movement of the projection range 100 in the horizontal direction and the vertical direction based on these values. Therefore, even when the projection system 10 is configured using the projector 11B instead of the projector 11, the projection system 10 can perform projection by changing the projection image following the movement of the projection range 100, and the user can The entire image data 22B can be viewed.

[Modification 4]
In the above embodiment and each modified example, the case where projection is performed on the flat screen SC has been described, but the present invention is also useful when projecting an image on a curved surface or a plurality of planes.
FIG. 9 is a diagram showing a configuration of the fourth modification.
In the configuration shown in FIG. 9, an image is projected onto a screen SC ′ formed on the inner surface of a hemispherical dome. The projector 11 is installed on the bottom surface P of the hemispheric dome, is located at the center of the hemisphere, and projects an image onto the projection range 100 on the screen SC ′.
According to the configuration shown in FIG. 9, by using the projector 11 that projects an image onto the projection range 100 smaller than the screen SC ′ and projecting while moving the projection range 100, a large image over the entire screen SC ′ can be obtained. Can see.

[Modification 5]
FIG. 10 is a diagram illustrating a configuration of the fifth modification.
In the configuration shown in FIG. 10, the projector 11 projects an image using the wall surface and ceiling surface of the rectangular parallelepiped room R as screens. For example, the projector 11 is installed so that the front surface of the main body of the projector 11 faces the ceiling surface. According to the configuration of FIG. 10, a large image over the wall surface and ceiling surface of the room R can be viewed using the projector 11.

Note that the above-described embodiments and modifications do not limit the present invention, and the present invention can be applied as an aspect different from the above-described embodiments and modifications. For example, in the embodiment and the modification described above, the configuration in which the communication unit 26 of the PC 2 and the communication unit 47 of the projectors 11 and 11A to 11C are connected by wire is described as an example, but the present invention is not limited to this. It is also possible to adopt a configuration in which various data are connected so as to be able to be transmitted and received by a wireless communication method. In this case, as a wireless communication method, for example, a short-range wireless communication method such as wireless LAN, Bluetooth (registered trademark), UWB, infrared communication, or a wireless communication method using a mobile phone line can be employed. In addition, a plurality of PCs 2 may be connected to one projector 11 by wire or wirelessly.
Furthermore, an image may be projected from the plurality of projectors 11 and 11A to 11C on one screen SC and SC ′. In this case, among the one image corresponding to the projection range 200, the plurality of projectors 11 and 11A. It can be set as the structure which each projects a different part by ~ 11C. That is, a portion corresponding to the projection direction of each projector 11, 11A to 11C may be extracted and projected from one image data 22B.

  Further, the projectors 11 and 11A to 11C according to the above-described embodiments and modifications may be configured to perform trapezoidal distortion correction corresponding to the angle between the projection light and the screens SC and SC ′. Specifically, for example, the projection state of the screens SC and SC ′ may be captured by the imaging unit 48, and the trapezoidal distortion state may be detected from the captured image and corrected.

  Moreover, in the said embodiment and each modification, the structure where the projectors 11 and 11A-11C were connected to PC2 was demonstrated. In this configuration, the PC 2 performs processing such as extracting a part of the image data 22B stored in the storage unit 22 and outputs image data, and the projectors 11 and 11A to 11C project this image data. The present invention is not limited to this, and the projector 11, 11 </ b> A to 11 </ b> C may be configured integrally with the functions of the PC 2. In this case, the projectors 11 and 11A to 11C may be configured to have all the functions described as the functions of the PC 2. Further, an external device having a storage unit 22 for storing the image data 22B is connected to the projectors 11, 11A to 11C, and the projectors 11, 11A to 11C acquire the image data 22B from the external devices, and the acquired image data 22B. It is good also as a structure which extracts and projects a part of.

  In the above embodiment, the control program 105A stored in the storage unit 105 of the projector 11 and the control program 22A stored in the storage unit 22 of the PC 2 may be stored in a non-volatile memory (not shown). The configuration may be stored in a portable recording medium, or the PC 2 may be stored in a downloadable manner in another device connected via a communication network. Moreover, each function part of PC2 and projector 11, 11A-11C shown in FIG.2 and FIG.8 shows a functional structure, Comprising: A specific mounting form is not restrict | limited in particular. That is, it is not always necessary to mount hardware corresponding to each function unit individually, and it is of course possible to adopt a configuration in which the functions of a plurality of function units are realized by one processor executing a program. In addition, in the above embodiment, a part of the function realized by software may be realized by hardware, or a part of the function realized by hardware may be realized by software. In addition, the specific detailed configuration of the projection system 10 can be arbitrarily changed without departing from the spirit of the present invention.

  DESCRIPTION OF SYMBOLS 2 ... PC (image supply apparatus), 3 ... Projection part, 10 ... Projection system, 11, 11A-11C ... Projector, 15, 15A, 15C ... Main body, 16, 16A ... Turning part, 17 ... Horizontal turning part, 21 ... Control unit, 21A ... Communication control unit, 21B ... Image acquisition unit, 21C ... Change amount detection unit, 21D ... Range detection unit (range detection unit), 21E ... Extraction unit (image extraction unit), 22 ... Storage unit, 22A ... Control program, 22B ... Image data (whole image), 22C ... Test image data, 22D ... Change amount data, 22E ... Projection direction data, 24 ... Image output unit, 26 ... Communication unit, 47 ... Communication unit, 48 ... Image pick-up unit, 50 ... position detection device, 100 ... projection range, 100A to 100D, 100C ', 100D' ... vertex, 103 ... control unit, 103A ... display control unit, 103B ... drive control unit , 103C ... communication control unit, 105 ... storage unit, 105A ... control program, 113 ... image processing unit, 125 ... rotation operation unit (projection direction changing means), 127 ... angle detection unit (projection direction detection means), 129 ... sensor Part (projection direction detection means), 200 ... projection range, P ... bottom surface, R ... chamber, SC, SC '... screen (projection surface).

Claims (7)

A projector, and an image supply device that supplies image data representing an image to the projector,
The projector includes a projecting unit that projects the image onto a projection surface.
The image supply device includes:
Based on the positional relationship between the projection surface and the projection range by the projection means, a range detection means for obtaining a projected range from a whole image having a resolution larger than the resolution that the projection means can project;
An image extraction unit that extracts the range obtained by the range detection unit from the entire image and supplies the range to the projector as the image data;
Projection system characterized by   The range detection unit included in the image supply device newly calculates the range following the change when the relative position of the projection surface and the projection range by the projection unit changes. Item 4. The projection system according to Item 1. The projector is
Projection direction changing means for changing the direction of the projection means;
A projection direction detection unit that detects a direction of the projection unit with respect to the projector body,
The range detection unit included in the image supply device newly obtains the range following the change when the direction of the projection unit detected by the projection direction detection unit is changed. Item 3. The projection system according to Item 2.   The projection system according to claim 1, wherein the projection surface is a flat surface or a curved surface. An image supply device that supplies image data representing the image to a projector that projects an image on a projection surface,
Based on the positional relationship between the projection surface and the projection range of the projector, range detection means for obtaining a projected range from an overall image having a resolution larger than the resolution that can be projected by the projector;
An image extraction unit that extracts the range obtained by the range detection unit from the entire image and supplies the range as the image data;
An image supply apparatus comprising: Projection means for projecting an image on the projection surface;
Based on the positional relationship between the projection surface and the projection range by the projection means, a range detection means for obtaining a projected range from a whole image having a resolution larger than the resolution that the projection means can project;
Image extraction means for extracting the range obtained by the range detection means from the whole image;
Projection control means for projecting the image extracted by the image extraction means by the projection means;
A projector comprising: An image projection method using a projector that projects an image on a projection surface,
Based on the positional relationship between the projection surface and the projection range of the projector, a range to be projected is obtained from the entire image having a resolution larger than the resolution that the projector can project,
Extract the calculated range from the whole image,
Projecting the extracted range by the projector;
An image projection method characterized by the above.

Images