JP2006033357A - Image converting apparatus and video image projecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image converting apparatus which can alleviate the limit of an arrangement with a low cost and can correct the distortion of a video image by the distortion of a screen itself, and to provide a video image projecting device. <P>SOLUTION: The image converting apparatus includes a test image memory 10 for storing a test image to be projected from a projector 4 to the screen 5, a controller 13 which receives the photographed image of the test image projected from the projector 4 to the screen 5 and photographed by a portable telephone 6 with a camera from the portable telephone 6 with the camera, and an image correcting unit 8 for geometrically correcting the video image output from a DVD player 2 on the basis of the photographed image received by the controller 13 to convert the video image into a predetermined video image. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image conversion device that converts a video output from a video output device into a predetermined video and projects the predetermined video on a screen from the video projection device, and a video projection device having the function of the image conversion device. .

  Generally, an image conversion device has a function of converting a video output from a video output device such as a DVD (Digital Versatile Disc) or a PC (Personal Computer) into a video format used in a video projection device such as a projector. There are also video projection apparatuses that incorporate such a conversion function.

  In recent years, with the advancement of network technology, a system in which such a video projection apparatus is connected to a network such as a LAN (Local Area Network) has been increasing (for example, see Patent Document 1).

Some of such video projection apparatuses have a function of receiving video from a mobile phone or the like and projecting the video onto a screen (see, for example, Patent Document 2).
By the way, some of such image conversion devices and video projection devices perform geometric correction on the video output from the video output device. In particular, in business image conversion devices and video projection devices used in theaters and conference rooms, images that are projected on a screen are captured by a camera, and video output from the video output device using the captured images. There is one that corrects the geometry. Such commercial image conversion devices and video projection devices have very high performance compared to consumer-level image conversion devices and video projection devices.
JP 2002-247539 A (pages 4-6, FIGS. 1-6) Japanese Patent Laid-Open No. 2001-24926 (page 5, FIG. 12)

  However, as described above, the geometric correction of the image by the camera photographing can improve the accuracy of the geometric correction, but it is necessary to provide the image conversion device and the video projection device with a mechanism for connecting to the camera. In addition, there is a problem that the image projection apparatus becomes larger and expensive.

  In addition, video projection devices for home theater as consumer devices have low performance in order to reduce costs, and many of them only support geometric correction such as simple keystone correction. For this reason, a video projection apparatus that performs such simple geometric correction needs to be arranged perpendicularly to the screen, and there is a problem that the arrangement of the video projection apparatus is greatly limited.

  Moreover, the screen for home theater is not a hard screen that is always installed, but is often a simple soft screen or a curtain. As described above, when a soft screen or a curtain is used as the screen, the screen itself is often distorted, and there is a problem in that the image projected on the screen from the image projection device is distorted. .

  Therefore, an object of the present invention is to provide an image conversion device and a video projection device that are inexpensive, can relax restrictions on arrangement, and can correct image distortion due to distortion of the screen itself. .

In order to solve the above problems, the present invention adopts the following configuration.
That is, the image conversion device of the present invention is an image conversion device that converts a video output from a video output device into a predetermined video, and projects the predetermined video on a screen from the video projection device. A test image storage means for storing a test image to be projected onto the screen from the video projection device, a test image projected onto the screen from the video projection device is taken by a mobile phone with a camera, and the captured image of the test image is taken by the mobile phone with a camera Receiving means for receiving from a telephone, and conversion means for geometrically correcting a video output from the video output device based on a photographed image received by the receiving means and converting the video into the predetermined video. To do.

  The conversion unit of the image conversion apparatus includes a correction data calculation unit that calculates correction data based on a captured image received by the reception unit, and a correction data storage unit that stores the correction data calculated by the calculation unit. And image correction means for geometrically correcting the video output from the video output device based on the correction data stored in the correction data storage means and converting it into the predetermined video.

  Further, the correction data calculation means of the image conversion device includes the coordinates before the geometric correction of the test image in the coordinate system corresponding to the image sensor of the mobile phone with camera based on the captured image received by the receiving means, and the The coordinates after the geometric correction of the test image may be obtained, and the correction data may be calculated based on the coordinates before the geometric correction and the coordinates after the geometric correction.

  Further, the conversion means of the image conversion apparatus may be configured to read the test image from the correction data storage means and output it to the image projection apparatus when receiving the instruction information transmitted from the camera-equipped mobile phone.

  The video projection apparatus of the present invention is a video projection apparatus that converts a video output from a video output apparatus into a predetermined video and projects the predetermined video on a screen, and stores a test image in a test image storage Means, a test means for projecting the test image stored in the test image storage means or the predetermined image onto the screen, and a test image projected from the projection means onto the screen is photographed by a mobile phone with a camera, Receiving means for receiving a photographed image of the test image from the camera-equipped mobile phone, and geometrically correcting the video output from the video output device based on the photographed image received by the receiving means to the predetermined video Conversion means for converting.

  The conversion unit of the video projection apparatus includes a correction data calculation unit that calculates correction data based on a captured image received by the reception unit, and a correction data that stores the correction data calculated by the correction data calculation unit. The image processing device may include a storage unit and an image correction unit that geometrically corrects the video output from the video output device based on the correction data stored in the correction data storage unit and converts the video into the predetermined video.

  Further, the correction data calculation means of the video projection device includes the coordinates before geometric correction of the test image in the coordinate system corresponding to the imaging device of the camera-equipped mobile phone based on the captured image received by the reception means, and the The coordinates after the geometric correction of the test image may be obtained, and the correction data may be calculated based on the coordinates before the geometric correction and the coordinates after the geometric correction.

  Further, the conversion unit of the video projection device may be configured to read the test image from the correction data storage unit and output it to the projection unit when receiving the instruction information transmitted from the camera-equipped mobile phone.

  According to the present invention, since the video of the video output device is geometrically corrected based on the photographed image of the camera-equipped mobile phone, compared to the image conversion device and the video projection device connected to the camera for correcting the image. Therefore, it is not necessary to provide a mechanism for connecting to the camera, and accordingly, the entire apparatus can be reduced in size and cost.

  Further, according to the present invention, since the photographed image for geometric correction is received from the camera-equipped mobile phone, the degree of freedom in arrangement of the image conversion device and the video projection device is increased, and the arrangement of the video projection device is limited. Can be relaxed.

  In addition, according to the present invention, since the video projected on the screen is shot by the mobile phone with a camera and the geometric correction of the video is performed based on the shot image, the screen is distorted to the screen itself such as a soft screen or a curtain. Even if the screen is prone to cause image distortion, image distortion can be suppressed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a video output system including an image conversion apparatus according to an embodiment of the present invention.
As shown in FIG. 1, the video output system 1 includes a DVD player 2 as a video output device, an image conversion device 3, a projector 4 as a video projection device, a screen 5, and a camera-equipped mobile phone 6. Has been. The video output device may be a PC or the like and is not limited to the DVD player 2.

The DVD player 2 reproduces and outputs the video recorded on the DVD.
The image conversion device 3 performs geometric correction on the video output from the DVD player 2 based on correction data stored in advance, converts the video into a predetermined video, and outputs the video to the projector 4.

The projector 4 projects a predetermined video output from the image conversion device 3 on the screen 5.
The camera-equipped mobile phone 6 transmits an e-mail (E-Mail) indicating instruction information to the image conversion device 3 or takes an image projected on the screen 5 by a built-in camera and converts the taken image into an e-mail. Attached and transmitted to the image conversion apparatus 3. When the image conversion apparatus 3 receives the e-mail indicating the instruction information, the image conversion apparatus 3 outputs a test image stored therein in advance to the projector 4. Further, when the image conversion device 3 receives a captured image attached to an e-mail, the image conversion device 3 calculates correction data based on the captured image.

FIG. 2 is a diagram illustrating the image conversion apparatus 3.
As shown in FIG. 2, the image conversion apparatus 3 includes an input signal processing unit 7, an image correction unit 8, an output signal processing unit 9, a test image storage unit 10, a correction data storage unit 11, and correction data calculation. A unit 12, a control unit 13, and a mobile phone information storage unit 14 are provided. The input signal processing unit 7, the image correction unit 8, the output signal processing unit 9, the correction data calculation unit 12, and the control unit 13 are, for example, a recording medium such as a RAM (Random Access Memory) and a ROM (Read Only Memory). It is assumed that the application to be recorded is executed by an arithmetic unit such as a CPU (Central Processing Unit). Further, as the test image storage unit 10, the correction data storage unit 11, and the mobile phone information storage unit 14, for example, a recording medium such as a RAM or a ROM can be considered.

  The input signal processing unit 7 receives a video signal indicating a video to be reproduced by the DVD player 2 and converts the video signal into digital data in pixel units (for example, 8 bits) suitable for geometric correction.

The image correction unit 8 geometrically corrects the video signal converted into digital data based on the correction data stored in the correction data storage unit 11.
The output signal processing unit 9 converts the video signal geometrically corrected by the image correction unit 8 into a signal format suitable for the projector 4 to perform signal processing during normal operation (before receiving an e-mail indicating instruction information). And output to the projector 4. Further, the output signal processing unit 9 has a signal format suitable for the projector 4 to perform signal processing on the test image stored in the test image storage unit 10 during calibration (after receiving an e-mail indicating instruction information). The data is converted and output to the projector 4.

The correction data calculation unit 12 calculates correction data based on the captured image attached to the e-mail.
The control unit 13 controls the operation of the entire image conversion apparatus 3. The control unit 13 has a reception function for receiving an e-mail transmitted from the camera-equipped mobile phone 6, and automatically analyzes the content of the e-mail to control the operation of the image conversion apparatus 3. The reception function for receiving e-mail is realized by executing software corresponding to a mail server protocol such as POP (Post Office Protocol) or IMAP (Internet Message Access Protocol).

The mobile phone information storage unit 14 stores unique information regarding a plurality of types of camera-equipped mobile phones 6 that are assumed to be used in the video output system 1.
Next, operations of the image conversion device 3 and the camera-equipped mobile phone 6 during calibration will be described.

FIG. 3 is a flowchart showing the operations of the image conversion device 3 and the camera-equipped mobile phone 6 during calibration.
As shown in FIG. 3, first, in step S <b> 1, the camera-equipped mobile phone 6 is inputted with “change calibration mode” corresponding to the instruction information in the title column, and the model name of the camera-equipped mobile phone 6 in the body text. An e-mail in which identification information that can identify the camera-equipped mobile phone 6 is input is transmitted to the image conversion apparatus 3.

Next, in step S2, the control unit 13 of the image conversion apparatus 3 receives an e-mail.
Next, in step S3, the control unit 13 of the image conversion apparatus 3 analyzes the title of the e-mail.

  Next, in step S4, when the control unit 13 of the image conversion apparatus 3 determines that “change calibration mode” is input in the column of the title of the e-mail, the normal operation mode (the image correction unit 8 uses the correction data). (A state in which the video signal is geometrically corrected based on the above) to a calibration mode (a state in which the correction data calculation unit 12 calculates correction data based on the captured image attached to the e-mail). The title of the e-mail when shifting from the normal operation mode to the calibration mode is not limited to “change calibration mode”, and can be arbitrarily changed.

Next, in step S5, the control unit 13 of the image conversion apparatus 3 analyzes the identification information input in the body of the email.
Next, in step S6, the control unit 13 of the image conversion device 3 determines the number of pixels of the camera built in the camera-equipped mobile phone 6 and the image format of the camera-equipped mobile phone 6 from the analyzed identification information (in the camera-equipped mobile phone 6). Specific information such as a signal format that can be processed is read from the mobile phone information storage unit 14, and the specific information is set as information for calculating correction data.

  For example, if identification information such as “XX phone” as the model name, “310,000 pixels” as the number of pixels, and “JPEG” as the image format are entered in the body of the e-mail, the “XX phone”, “31” The coordinate system of “640 × 480” is read from the mobile phone information storage unit 14 as unique information corresponding to “10,000 pixels” and “JPEG”, and the coordinate system is used for calculating correction data.

  Next, in step S <b> 7, the control unit 13 of the image conversion apparatus 3 reads a test image from the test image storage unit 10, and a signal suitable for the projector 4 to perform signal processing on the test image in the output signal processing unit 9. It is converted into a format and output to the projector 4. The projector 4 projects the test image output from the image conversion device 3 onto the screen 5.

Next, in step S <b> 8, the camera-equipped mobile phone 6 captures a test image projected on the screen 5.
Next, in step S <b> 9, the camera-equipped mobile phone 6 transmits an e-mail to which “calibration picture” is input in the title column and a captured image of the test image is attached to the image conversion device 3. Note that the title input when a captured image is attached to an e-mail is not limited to “calibration picture” but can be arbitrarily changed.

Next, in step S10, the control unit 13 of the image conversion apparatus 3 receives an e-mail.
Next, in step S11, the control unit 13 of the image conversion apparatus 3 analyzes the title.

  Next, in step S12, when the control unit 13 of the image conversion apparatus 3 determines that “calibration picture” is input in the title column, the correction data calculation unit 12 captures the image attached to the e-mail. Correction data is calculated based on the image.

Next, in step S <b> 13, the control unit 13 of the image conversion apparatus 3 stores the calculated correction data in the correction data storage unit 11.
Next, in step S <b> 14, the control unit 13 of the image conversion apparatus 3 causes the output signal processing unit 10 to stop outputting the test image.

In step S15, the control unit 14 of the image conversion apparatus 3 shifts from the calibration mode to the normal operation mode and ends the operation.
Next, an example of a correction data calculation method in the correction data calculation unit 12 will be described.

FIG. 4 is a diagram illustrating an example of a test image stored in the test image storage unit 11. FIG. 5 is a diagram showing an example of a lattice pattern projected on the screen 5 before geometric correction.
As shown in FIG. 4, a grid-like figure (hereinafter referred to as a grid pattern) 15 is used as a test image. Further, as shown in FIG. 5, the screen 5 before the geometric correction is performed according to the positional relationship between the projector 4 and the screen 5. A method of calculating correction data when the grid pattern 16 projected on the screen is distorted in the vertical and horizontal directions will be described.

  Note that the shooting position of the camera-equipped mobile phone 6 when the lattice pattern 16 shown in FIG. There is no particular limitation as long as the entire lattice pattern 16 is within the camera angle of view. The pixel arrangement of the captured image of the camera-equipped mobile phone 6, that is, the arrangement of the imaging elements of the camera-equipped mobile phone 6 is a coordinate system at the user's viewpoint (hereinafter referred to as a user viewpoint coordinate system). The pixel arrangement of the image projected on the screen 5, that is, the arrangement of the output elements of the projector 4 is defined as a coordinate system in the projector 4 (hereinafter referred to as a display coordinate system).

FIG. 6 is a diagram illustrating an example of a lattice pattern projected onto the screen 5 after geometric correction. In addition, the same code | symbol is attached | subjected to the same structure as the structure shown in FIG.
As shown in FIG. 6, the lattice pattern 18 projected on the screen 5 after geometric correction is formed inside the outer frame 19 of the lattice pattern 16 shown in FIG. That is, the entire lattice pattern 18 is accommodated in the lattice pattern 16 shown in FIG. 5 while satisfying the aspect ratio of the lattice pattern 15 shown in FIG. Note that, in the portion where the lattice pattern is reduced during geometric correction, one pixel is formed from a plurality of adjacent pixels.

  First, the correction data calculation unit 12 obtains the user viewpoint coordinate system based on the unique information obtained from the identification information of the electronic mail, and obtains the display coordinate system based on the information sent from the projector 4 and the like.

Next, the correction data calculation unit 12 searches the pixel information on the captured image of the e-mail and obtains each coordinate of the user viewpoint coordinate system corresponding to each intersection of the lattice pattern 16 shown in FIG.
Next, the correction data calculation unit 12 obtains each coordinate of the user viewpoint coordinate system corresponding to each intersection of the lattice pattern 18 shown in FIG. It should be noted that the coordinates of the grid pattern other than the intersection are obtained by performing linear interpolation from the movement amount of the adjacent intersection.

Next, the correction data calculation unit 12 obtains a relative relationship between each coordinate of the lattice pattern 16 and each coordinate of the lattice pattern 18 in the user viewpoint coordinate system.
Next, the correction data calculation unit 12 obtains each coordinate of the display coordinate system corresponding to each intersection of the lattice pattern 16 shown in FIG.

  Next, the correction data calculation unit 12 calculates each coordinate of the display coordinate system corresponding to each intersection of the grid pattern 18 shown in FIG. 6 based on the relative relationship between the grid pattern 16 and the grid pattern 18 in the user viewpoint coordinate system. Ask.

  The correction data calculation unit 12 calculates data indicating all relative relationships between the coordinates of the grid pattern 16 in the display coordinate system and the coordinates of the grid pattern 18 in the display coordinate system, and uses the data as correction data.

  Here, for example, an intersection of the grid pattern 15 in the user viewpoint coordinate system is A, the x coordinate of the intersection A is 150, the y coordinate is 120, the intersection of the intersection A after geometric correction is B, and the x of the intersection B Consider a case where the coordinates are 159 and the y-coordinate is 119. The intersection of the display coordinate system corresponding to the intersection A is C, the x coordinate of the intersection C is 0, and the y coordinate is 0. The intersection of the intersection C after geometric correction, that is, the display coordinates corresponding to the intersection B Consider a case where the intersection of the systems is D.

  Note that the size of one output element of the projector 4 is equal to the size of one image pickup element of the mobile phone 6 with a camera. Further, the number of pixels of the camera-equipped mobile phone 6 (number of imaging elements) is 640 × 480≈310,000 pixels, and the number of pixels of the projector 4 (number of output elements) is 1920 × 1080≈2 million pixels.

  In such a case, the movement amount of the coordinates from the intersection A to the intersection B is +9 for the x coordinate and −1 for the y coordinate. If the coordinates of the intersection D are 1920 / 620≈3 and 1080 / 480≈2, the x coordinate of the intersection D is (+9) × 3 = 27 and the y coordinate is (−) from the relative relationship between the intersection A and the intersection B. 1) × 2 = −2. As a result, the movement amount of the coordinates from the intersection C to the intersection D is +27 for the x coordinate and −2 for the y coordinate, and correction data “the pixel of (0,0) is coordinate-converted to (27, −2)”. Is obtained.

  Note that each coordinate of the grid pattern 18 in the user viewpoint coordinate system may be obtained using projective transformation. As a method for increasing the accuracy of geometric correction, for example, increasing the number of lattices of the lattice pattern can be considered.

Next, the operation of the image conversion apparatus 3 in the normal mode will be described.
First, the input signal processing unit 7 converts the video signal output from the DVD player 2 into digital data in pixel units suitable for geometric correction and outputs the digital data to the image correction unit 8.

  Next, the image correction unit 8 performs coordinate conversion of the video signal output from the DVD player 2 based on the correction data stored in the correction data storage unit 11 to form an output image. Note that in a region (background) where an output image is not formed after geometric correction, a black image or an image with an inconspicuous color when an image is projected onto the screen 5 is output from the projector 4.

Next, the output signal processing unit 9 converts the formed output image into a signal format suitable for signal processing by the projector 4 and outputs the signal format.
Then, the projector 4 projects the output image on the screen 5.

  As described above, the image conversion apparatus 3 geometrically corrects the video of the DVD player 2 based on the image captured by the camera-equipped mobile phone 6, and thus includes a geometric correction camera used in a concert hall or the like. Compared with an image conversion apparatus and a video projection apparatus, the apparatus can be reduced in size and made inexpensive because it is not necessary to provide a mechanism for connecting the camera for geometric correction.

  Further, since the image conversion apparatus 3 receives a photographed image for geometric correction from the mobile phone 6 with a camera using an e-mail, even if the image conversion apparatus 3 and the projector 4 are installed on the ceiling, the user's The viewpoint position (observation point of the image projected on the screen 5) can be easily changed, the degree of freedom of arrangement of the image conversion device 3 and the projector 4 is increased, and the restriction on the arrangement of the projector 4 can be relaxed. .

  In addition, since the image projected on the screen 5 is captured by the camera-equipped mobile phone 6 and the image conversion apparatus 3 performs geometric correction of the image based on the captured image, the screen itself is a soft screen, curtain, or other screen itself. Even if the screen is susceptible to distortion, image distortion can be suppressed.

  Further, since the image conversion apparatus 3 performs coordinate conversion of the test image in the user viewpoint coordinate system, the image projected on the screen 5 after geometric correction depends on the tilt of the camera-equipped mobile phone 6 when the test image is captured. To do. For example, when the camera-equipped mobile phone 6 is tilted 90 degrees clockwise, the geometrically corrected image output from the DVD player 2 is also tilted 90 degrees clockwise.

  In the above-described embodiment, the entire test image projected from the projector 4 onto the screen 5 is captured at a time, and the captured image is transmitted to the image conversion device 3. However, when the projection area of the projector 4 is wide For example, when the test image projected on the screen 5 cannot be photographed at one time, the photographed image corresponding to the test image may be generated by photographing the test image a plurality of times. That is, the test images may be captured a plurality of times so that the captured images overlap each other, and when the correction data is calculated, the captured images may be generated by combining the captured images and indicating the entire test image.

  In the above embodiment, the coordinate transformation other than the intersection of the grid pattern is performed by linear interpolation. However, in order to make the coordinate transformation other than the intersection more precise coordinate transformation, You may make it carry out using a high-order polynomial.

  Moreover, in the said embodiment, although the image converter 3 is a structure provided with the reception function for receiving an email, the transmission function for notifying the completion | finish of each operation | movement to the mobile phone 6 with a camera is provided. You may comprise so that it may prepare for.

  Further, the projector 4 may be configured to have the function of the image conversion device 3. That is, the projector 4 includes an input signal processing unit 7, an image correction unit 8, an output signal processing unit 9, a test image storage unit 10, a correction data storage unit 11, a correction data calculation unit 12, and a control unit 13. The mobile phone information storage unit 14 and a projection unit that projects the test image stored in the test image storage unit 10 and the image signal after geometric correction output from the image correction unit 8 onto the screen 5 are configured. Also good.

1 is a diagram illustrating a video output system including an image conversion apparatus according to an embodiment of the present invention. It is a figure which shows an image converter. It is a flowchart which shows operation | movement of the mobile telephone with a camera, and an image converter. It is a figure which shows an example of a test image. It is a figure which shows an example of the lattice pattern projected on a screen before geometric correction. It is a figure which shows an example of the lattice pattern projected on a screen after geometric correction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Video output system 2 DVD player 3 Image converter 4 Projector 5 Screen 6 Camera-equipped mobile phone 7 Input signal processing unit 8 Image correction unit 9 Output signal processing unit 10 Test image storage unit 11 Correction data storage unit 12 Correction data calculation unit 13 Control unit 14 Cellular phone information storage unit 15 Grid pattern 16 Grid pattern 17 Shootable range 18 Grid pattern 19 Outer frame

Claims (8)

An image conversion device that converts a video output from a video output device into a predetermined video, and projects the predetermined video on a screen from a video projection device,
Test image storage means for storing a test image to be projected onto the screen from the video projection device;
A receiving unit configured to capture a test image projected from the video projection device on the screen by a mobile phone with a camera, and to receive a captured image of the test image from the mobile phone with a camera;
Conversion means for geometrically correcting the video output from the video output device based on the captured image received by the receiving means and converting the video to the predetermined video;
An image conversion apparatus comprising: The image conversion apparatus according to claim 1,
The converting means includes
Correction data calculating means for calculating correction data based on the captured image received by the receiving means;
Correction data storage means for storing correction data calculated by the calculation means;
Image correction means for geometrically correcting the video output from the video output device based on the correction data stored in the correction data storage means and converting it into the predetermined video;
An image conversion apparatus comprising: The image conversion device according to claim 2,
The correction data calculation means is configured to determine the coordinates before geometric correction of the test image and the geometric correction of the test image in a coordinate system corresponding to the imaging device of the camera-equipped mobile phone based on the captured image received by the reception means. And calculating the correction data based on the coordinates before geometric correction and the coordinates after geometric correction. The image conversion device according to claim 2,
The image conversion apparatus according to claim 1, wherein when the instruction information transmitted from the camera-equipped mobile phone is received, the conversion means reads the test image from the correction data storage means and outputs the test image to the image projection apparatus. A video projection device that converts a video output from a video output device into a predetermined video and projects the predetermined video on a screen,
Test image storage means for storing a test image;
Projecting means for projecting the test image stored in the test image storage means or the predetermined video onto the screen;
A receiving unit that receives a captured image of the test image from the camera-equipped mobile phone;
Conversion means for geometrically correcting the video output from the video output device based on the captured image received by the receiving means and converting the video to the predetermined video;
A video projection apparatus comprising: The video projection device according to claim 5,
The converting means includes
Correction data calculating means for calculating correction data based on the captured image received by the receiving means;
Correction data storage means for storing correction data calculated by the correction data calculation means;
Image correction means for geometrically correcting the video output from the video output device based on the correction data stored in the correction data storage means and converting it into the predetermined video;
A video projection apparatus comprising: The video projection device according to claim 6,
The correction data calculation means is configured to determine the coordinates before geometric correction of the test image and the geometric correction of the test image in a coordinate system corresponding to the imaging device of the camera-equipped mobile phone based on the captured image received by the reception means. And calculating the correction data based on the coordinates before geometric correction and the coordinates after geometric correction. The video projection device according to claim 6,
The video projection device, wherein the conversion unit reads the test image from the correction data storage unit and outputs it to the projection unit when receiving the instruction information transmitted from the camera-equipped mobile phone.

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