JP2015175975A - Image display device, image display method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a display content that is not allowed to be photographed from becoming allowed to be photographed in response to the switching of display contents.SOLUTION: When security information indicating the photographing-prohibited area of the next image to be displayed is acquired, a control unit 105 outputs a first infrared ray irradiation instruction that causes the whole of a photographing-prohibited area in the current image and a photographing-prohibited area in the next image to be displayed to be irradiated with infrared ray. When it is confirmed that irradiation corresponding to the first infrared ray irradiation instruction is indicated, the display image is switched to the next image to be displayed. Then, the control unit 105 outputs a second infrared ray irradiation instruction that causes a photographing-prohibited area in the projection image after the update to be continuously irradiated with infrared ray, and terminates irradiation, with infrared ray, of the photographing-prohibited area of the display image being displayed before the update.

Description

  In particular, the present invention relates to an image display device, an image display method, and a program suitable for use in displaying an image including a photographing non-permitted region.

  In various seminars and presentations such as products and technologies, it is common to make presentations while displaying information such as images and characters by projectors and displays. As one means for recording the contents of this presentation, it is conceivable to photograph information displayed using a digital camera or a digital video camera. However, such shooting is a problem from the viewpoint that the disclosed disclosure information for the audience can be distributed without limitation through the Internet or the like, and the copyright of the display image is protected.

  Therefore, as a technique for preventing the photographing of an image to be protected by copyright projected in a movie theater or the like, a method of irradiating invisible light such as infrared light from the screen side to the photographer side has been proposed (for example, Patent Documents 1 to 3). In this shooting prevention method, infrared light is irradiated from the back of the screen, or infrared light is irradiated toward the screen and reflected on the screen, so that infrared light is transmitted to the digital camera or digital video camera together with visible light. Is made incident. Since an image sensor mounted on a general digital camera or digital video camera has sensitivity to infrared light, noise is added to the captured image in a red color.

  In addition, a method has been proposed in which a specific person or a recording device (such as a digital camera) is allowed to take an image and the other is prevented from taking an image (see Patent Document 4). In this photographing prevention method, invisible light is incident on a digital camera or digital video camera together with visible light, as in the above-described photographing prevention method. Then, a specific ID is defined for a specific person or recording device, and when this ID is recognized, shooting is performed without adding red noise to the captured image by stopping the irradiation of invisible light. To give permission. Furthermore, a method for controlling the imaging apparatus so that only permitted objects can be photographed has been proposed (see Patent Document 5).

International Publication No. 2011/002059 JP 2009-282270 A JP 2008-300441 A JP 2004-364250 A JP 2006-41841 A

  However, in the presentation, the photographing permission status varies depending on the display content. Therefore, in the conventional method of irradiating invisible light, it is necessary to operate a device that emits invisible light according to the change in the photographing permission status. When the device that emits invisible light is operated at the same time as switching the display content, the display content for that portion can be photographed due to the delay that occurs between the display content switching and the irradiation of the invisible light. End up. Further, in the method of controlling the image pickup apparatus, it is necessary to incorporate in advance a control unit that stops shooting when shooting is not permitted in the image pickup apparatus, and it is necessary to prevent bringing in an image pickup apparatus that does not incorporate this means.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to prevent display contents that are not permitted to be photographed from being photographed in accordance with switching of display contents.

  An image display device according to the present invention includes an acquisition unit that acquires security information indicating a photographing non-permission area in the image together with the image, an output unit that outputs and displays the image acquired by the acquisition unit on the display unit, Determining means for determining whether or not irradiation of invisible light that affects imaging of the imaging non-permission area corresponding to the security information acquired by the acquisition means is performed, and the output means includes the output means, The image is output to the display means after it is determined by the determination means that irradiation with invisible light has been performed.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that the display content which is an imaging | photography disapproval according to switching of the display content can be image | photographed.

1 is a block diagram illustrating an example of an internal configuration of a projector according to a first embodiment. It is a figure which shows the example of installation of the image display system which concerns on 1st Embodiment. It is a figure which shows the other example of installation of the image display system which concerns on 1st Embodiment. It is a flowchart which shows an example of the process sequence which displays the image in 1st Embodiment. It is a figure for demonstrating the imaging | photography non-permission area | region in an image. It is a figure for demonstrating the change of the area | region which irradiates infrared light. It is a block diagram which shows the internal structural example of the information processing apparatus which concerns on 2nd Embodiment. It is a figure which shows the example of installation of the image display system which concerns on 2nd Embodiment. It is a flowchart which shows an example of the process sequence which displays the image in 2nd Embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 2 is a diagram illustrating an installation example of the image display system according to the present embodiment. The image display system includes a projector 1 and an infrared light irradiation unit 2.
The projector 1 projects an image input from the outside via wired or wireless on an image display surface 3 such as a screen, a wall, or a whiteboard. Select a screen, wall, or whiteboard that reflects infrared light. The infrared light irradiation unit 2 is configured by an infrared LED, an infrared laser, or the like, and irradiates at least a part of the image display surface 3 with infrared light that is invisible and has an image sensor.

  The image display surface 3 is a screen that displays a projected image and reflects infrared light. As long as visible light and infrared light are reflected on the surface, a wall or a whiteboard can be used instead. The infrared light detection unit 6 includes an infrared sensor such as a CCD image sensor or a CMOS image sensor having sensitivity in the infrared region, detects infrared light reflected by the image display surface 3, and detects infrared light. The detection result is output to the projector 1. The infrared light detection result shows the area on the image display surface that is irradiated with infrared light and the area that is not irradiated.

  When infrared light is transmitted from the back side of the image display surface 3 toward the surface, the infrared light irradiation unit 2 is installed on the back side of the image display surface 3 as shown in FIG. You may make it irradiate to at least one part of the image display surface 3. FIG.

Next, the internal configuration of the image display system will be described with reference to FIG. FIG. 1 is a block diagram illustrating an internal configuration example of a projector 1 according to the present embodiment.
As shown in FIG. 1, the projector 1 includes a data input unit 101, an information extraction unit 102, a memory 103, a projection unit 104, and a control unit 105.

  The data input unit 101 is an interface for inputting data including images to the projector 1 from an external device such as a personal computer (PC) or a video device. In this embodiment, an interface conforming to the HDMI (registered trademark) standard is used. The information extraction unit 102 generates security information indicating permission or non-permission of photographing of the image.

  The memory 103 is composed of a RAM or the like and holds an image for projection. The projection unit 104 includes a liquid crystal that forms an image, a drive driver thereof, a projection lens, a drive system thereof, and a light source. The control unit 105 is, for example, a processor, and according to the infrared light detection result input from the infrared light detection unit 6 and the security information generated by the information extraction unit 102, the memory 103, the projection unit 104, and the red The outside light irradiation unit 2 is controlled.

  Hereinafter, the detailed operation of each part of the image display system will be described with reference to FIG. FIG. 4 is a flowchart illustrating an example of a processing procedure for displaying an image by the image display system according to the present embodiment. First, after the projector 1 is turned on and ready for projection, the operation when data including the image A shown in FIG. 5A is first input as data to be displayed next from a PC or video equipment. explain. Note that it is assumed that the image A shown in FIG. 5A includes areas 501 and 502 in which shooting is not permitted.

  The data input unit 101 waits until data including an image is received from an external device (step S401). The image may be a still image or a moving image updated at a constant cycle (for example, 60 Hz). Then, the received data is sequentially output to the information extraction unit 102.

  The information extraction unit 102 generates security information indicating permission or non-permission of photographing from data including an image to be projected next (hereinafter, the next image) (step S402). For example, in the case of the image A shown in FIG. 5A, security information indicating permission or non-permission of photographing in the image A that is the next image is generated. Hereinafter, an area in an image whose photographing is not permitted due to security information is referred to as a photographing non-permitted region. Here, a method for generating security information will be described.

  When using a method for searching for an image pattern indicating that photographing is not permitted on the next image and acquiring security information, a predetermined character, picture, shape, or the like is stored in the search dictionary as an image pattern indicating that photographing is not permitted. Register in advance. At this time, the image pattern may be a digital watermark that cannot be discerned by human eyes. In addition, when generating security information from metadata indicating permission or disapproval of shooting, metadata including permission or disapproval of shooting is added to data including an image received by the data input unit 101 in advance. And As an example of a method for adding metadata, there is a method of adding before or after image data or embedding it as an electronic watermark in an image.

  Security information is generated for each image and is associated with each image. Furthermore, the security information is defined in units of regions by dividing the image into regions so as not to allow photographing of a region having a specific shape such as a human face or a region designated by coordinates. is there. Note that it may be possible to define permission or non-permission of shooting for the entire image without defining the area unit.

  Before projecting the image associated with the security information from the projection unit 104, the control unit 105 compares the security information of the current image that is the current projection image (step S403). Note that if the target image is the head projection image, the security information to be compared does not exist, so the comparison results are considered to be not the same.

  If the security information is not identical as a result of the comparison in step S403, the control unit 105 outputs a first infrared light irradiation command to the infrared light irradiation unit 2 (step S405). The first infrared light irradiation command is a command for causing the infrared light irradiation unit 2 to irradiate infrared light to the entire photographing non-permitted region in the current image and the photographing non-permitted region in the next image. In addition, when there is no photographing non-permission area in the next image, since it is not different from the photographing non-permission area in the current image, the output of the first infrared light irradiation command may be omitted. When the image A shown in FIG. 5A is the first projected image, there is no current image, so that the imaging non-permission areas 501 and 502 in the image A shown in FIG. The unit 2 outputs a command to irradiate infrared light. FIG. 6A shows a display state of the image display surface 3 after the infrared light is irradiated by the first infrared light irradiation command. The image display surface 3 has an infrared light irradiation region 601, 602 is formed. Further, since there is no image to be projected before the image A, there is no image on the image display surface 3 shown in FIG.

  After outputting the first infrared light irradiation command, the control unit 105 waits until the infrared light detection result of the infrared light detection unit 6 indicates irradiation according to the first infrared light irradiation command (step S406). . That is, in step S406, the control unit 105 determines whether or not irradiation with invisible light (infrared light) that affects photographing in the photographing non-permitted region corresponding to the security information is performed.

  When the infrared light detection unit 6 detects infrared light in the infrared light irradiation area, the control unit 105 controls the projection unit 104 to read and project the next image from the memory 103 (step S407). That is, the control unit 105 displays the next image after determining that infrared light irradiation is being performed. FIG. 6B shows a display state of the image display surface 3 after the image A is projected. As shown in FIG. 6B, the infrared light irradiation area 601 overlaps with the imaging non-permission area 501 of the image A, and the infrared light irradiation area 602 overlaps with the imaging non-permission area 502 of the image A.

  Next, the control unit 105 outputs a second infrared light irradiation command to the infrared light irradiation unit 2 (step S408). Here, the second infrared light irradiation command is a command for continuing to irradiate infrared light to the photographing non-permitted region in the updated projection image by the infrared light irradiation unit 2. When the currently displayed projection image is the first projection image, the display state of the image display surface 3 after the infrared light irradiation according to the second infrared light irradiation command is the same as that in FIG. Note that if there is no photographing non-permitted region in the updated projection image, an instruction to stop irradiation of infrared light is issued. In the case of the image A, it is the head projection image, and the second infrared light irradiation command and the first infrared light irradiation command are commands for instructing irradiation of infrared light to the same region. In this case, the output of the second infrared light irradiation command may be omitted.

  After outputting the second infrared light irradiation command, the control unit 105 determines whether there is image data to be displayed next (step S409). As a result of the determination, if there is data for the next image to be displayed, the process returns to step S401. If there is no data for the next image to be displayed, the process proceeds to step S410.

  Next, an operation when the same image is input as the next data will be described. If the security information is the same as a result of the comparison in step S403, the control unit 105 controls the projection unit 104 to read and project the next image from the memory 103 (step S404). When the same image is input, the irradiation area is the same as the previous image, so an infrared light irradiation command is not output separately, but the red for each image regardless of whether the irradiation area has changed. An external light irradiation command may be output.

  Next, the operation when the data of the image B shown in FIG. 5B is input as the next data of the image A will be described. It is assumed that the image B shown in FIG. 5B includes imaging non-permission areas 503 and 504. As shown in FIG. 5, since the security information is not the same between the image A and the image B, the control unit 105 outputs a first infrared light irradiation command to the infrared light irradiation unit 2 in step S405. In response to the first infrared light irradiation command, the infrared light irradiation unit 2 irradiates the whole of the photographing non-permitted area in the current image and the photographing non-permitted area in the next image.

  Here, when it is assumed that the image B is the head image, the display state of the image display surface 3 after the infrared light is irradiated by the first infrared light irradiation command is as shown in FIG. Screen. In FIG. 6C, the infrared light irradiation area 603 overlaps with the image B imaging non-permission area 503, and the infrared light irradiation area 604 overlaps with the image B imaging non-permission area 504. However, the image A is projected as the current image, and it is necessary to continue the irradiation of infrared light to the imaging non-permitted area in the image A. Therefore, the first infrared light irradiation command is a command for irradiating the infrared light irradiation region corresponding to both the image A and the image B.

  FIG. 6D shows a display state of the image display surface 3 after the infrared light is irradiated by the first infrared light irradiation command. In FIG. 6D, an infrared light irradiation region 605 is a region where infrared light irradiation regions 601 and 603 are combined. Further, an infrared light irradiation region 602 shown in FIG. 6B and an infrared light irradiation region 604 shown in FIG. 6C are also included. Compared with the display state shown in FIG. 6B before the process of step S405 is executed, the projection image remains the image A, but the infrared light irradiation region changes.

  In step S405, the control unit 105 confirms whether infrared light is detected in the infrared light irradiation regions 602, 604, and 605. And this step is repeated until it detects.

  Subsequently, in step S <b> 107, the control unit 105 controls the projection unit 104 to read and project the next image B from the memory 103. FIG. 6E shows a display state of the image display surface 3 after the image B is projected. As shown in FIG. 6E, the infrared light irradiation area 605 overlaps with the non-permitted area 503 of the image B, and the infrared light irradiation area 604 overlaps with the non-permitted area 504 of the image B. Compared with the display state shown in FIG. 6D, the infrared light irradiation area is not changed, but the projection image is updated to the image B.

  Subsequently, in step S <b> 408, the control unit 105 outputs a second infrared light irradiation command to the infrared light irradiation unit 2. As described above, the second infrared light irradiation command is a command for causing the infrared light irradiation unit 2 to irradiate the infrared light to the imaging non-permitted region in the updated projection image. FIG. 6F shows a display state of the image display surface 3 after the infrared light is irradiated by the second infrared light irradiation command. As shown in FIG. 6F, the infrared light irradiation area 603 overlaps with the image B imaging non-permission area 503, and the infrared light irradiation area 604 overlaps with the image B imaging non-permission area 504. Compared with the display state shown in FIG. 6E, the infrared light irradiation region changes. When there is no photographing non-permitted region in the updated projection image, the second infrared light irradiation command is a command to stop the infrared light irradiation.

Next, the operation when there is no next data will be described.
If it is determined in step S109 that there is no image data to be displayed next, the control unit 105 stops the projection operation of the projection unit 104 (step S410). And the control part 105 outputs an infrared light irradiation stop command to the infrared light irradiation part 2, and stops irradiation of infrared light (step S411). The infrared light irradiation stop command is a command having the same operation content as the first infrared light irradiation command and the second infrared light irradiation command that are output when there is no infrared light irradiation region.

  Further, in step S406 of FIG. 4, the control unit 105 waits until the infrared light detection result of the infrared light detection unit 6 indicates irradiation according to the first infrared light irradiation command, but the upper limit of the standby time is set. It may be provided. In this case, even if the irradiation according to the first infrared light irradiation command is not indicated before the predetermined time has elapsed, the process jumps to step S410 to perform an interrupt process for stopping the projection operation of the projection unit 104. Good.

  As described above, according to the present embodiment, the first infrared light irradiation command and the second infrared light irradiation command are instructed so as to avoid a state in which infrared light is not irradiated to the imaging non-permission area. Thereby, it is possible to prevent the display contents that are not permitted to be photographed from being photographed in accordance with the switching of the display contents.

  In the present embodiment, the projection unit 104 of the projector 1 has been described as projecting onto the image display surface 3. However, when the image display surface 3 is used as a display screen and the projector 1 is displayed on the screen as an information processing device. You may apply to. Moreover, you may apply to the apparatus which can be displayed as another visible image. In the present embodiment, the infrared light irradiation unit 2 is described as irradiating infrared light from the front surface or the back surface of the image display surface 3. However, if the infrared light irradiation unit 2 is incident on the imaging device, infrared light irradiation is performed. The part may irradiate from the side or other directions.

  Furthermore, in the present embodiment, the description has been given on the assumption that HDMI is used as an interface for connecting a PC or video device to an image display system. However, the present invention is not limited to a specific interface, and other wired or wireless communication may be used. . In this embodiment, when metadata indicating permission or disapproval of shooting is given, it is described that the image is input to the projector 1 through the same interface as the image. However, different interfaces are used for the metadata and the image. It may be configured to be input using.

(Second Embodiment)
Hereinafter, the second embodiment of the present invention will be described focusing on differences from the first embodiment.
FIG. 8 is a diagram illustrating an installation example of the image display system according to the present embodiment. The image display system includes an information processing device 4, a display 5, and an infrared light irradiation unit 2.
The information processing apparatus 4 is a PC, for example, and executes processing defined by a program. When processing for generating an image is defined in the program, the information processing apparatus 4 also generates an image.

  The display 5 displays on the image display surface 3 an image input from the information processing device 4 or the like via wire or wireless. The image display surface 3 is composed of a liquid crystal panel or the like, and displays a visible light image. The image display surface 3 may have a property of reflecting infrared light on the surface, and a filter that transmits visible light and reflects infrared light is provided on the front surface of the image display surface 3. You may do it. About the infrared light irradiation part 2 and the infrared light detection part 6, since it is the same as that of FIG. 2, description is abbreviate | omitted.

FIG. 7 is a block diagram illustrating an internal configuration example of the information processing apparatus 4 according to the present embodiment.
As illustrated in FIG. 7, the information processing apparatus 4 includes a data storage unit 701, a data output unit 702, a memory 703, and a control unit 705.

  The data storage unit 701 includes a hard disk or a memory, and stores programs executed by the control unit 705, image files, document files, and the like. The data output unit 702 is an interface for outputting data including an image from the information processing apparatus 4 to the display 5. In this embodiment, an interface conforming to the HDMI standard is used. The memory 703 is composed of a RAM or the like and holds an image to be output to the display 5.

  The control unit 705 controls to read out the image file from the data storage unit 701 and output the image file to the display 5 and generates security information indicating permission or non-permission of photographing of the image. Furthermore, the memory 703, the data output unit 702, and the infrared light irradiation unit 2 are controlled according to the infrared light detection result and the security information.

  FIG. 9 is a flowchart illustrating an example of a processing procedure for displaying an image by the image display system according to the present embodiment. The following description will be made with reference to FIGS. 5 and 6 in the same manner as in the first embodiment, and the description will focus on the differences from the first embodiment.

  The control unit 705 waits until receiving an instruction to output an image from an operation unit (not shown) or the like (step S901). Upon receiving an instruction to output an image, the control unit 705 determines whether or not the output image needs to be updated (step S902). For example, when the image A is newly output as the next image in a state where nothing is displayed, it is determined that the output image needs to be updated because the current image does not exist.

  If the result of determination in step S902 is that there is no need to update the output image, processing proceeds to step S208 described later. On the other hand, when the output image needs to be updated, the control unit 705 generates the next image and the security information of the self-image described above (step S903). The security information is the same as that of the first embodiment. As an example of the metadata adding method, there is a method of adding it as binary data to an image file or embedding it as an electronic watermark in an image.

  Next, the processing from step S904 to S907 is the same as the processing from step S405 to S408 in FIG. The operation when a new image A is newly output in a state where nothing is displayed is the same as in the first embodiment.

  Then, when the second infrared light irradiation command is output in step S907, the control unit 705 determines whether or not the image output process is finished (step S908). If the result of this determination is that the image output process is not complete, the process returns to step S902. If the image output process is complete, the process proceeds to step S909. Here, when the image A is continuously output, the process returns to step S902, and the control unit 705 determines that there is no need to update the output image, so the process proceeds from step S902 to step S908, and the process is repeated. become.

  On the other hand, when the image B is output to the display 5 as the next image of the image A, the process returns from step S902, and the control unit 705 determines that the output image needs to be updated, and thus proceeds from step S902 to step S903. Since the following procedure is the same as that of the first embodiment, description thereof is omitted. If there is no image data to be displayed next, the process advances from step S908 to step S909, and the control unit 705 stops the output operation of the data output unit 702 (step S209). And the control part 705 outputs an infrared light irradiation stop command to the infrared light irradiation part 2, and stops irradiation of infrared light (step S910). As described above, according to the present embodiment, it is possible to prevent display contents that are not permitted to be photographed from being photographed in accordance with switching of the display contents.

  In the present embodiment, the data output from the data output unit 702 of the information processing device 4 has been described as being displayed on the image display surface 3 of the display 5. On the other hand, the present invention may be applied when the display 5 is a projector and the image display surface 3 is displayed as a projection area of the projector. Moreover, you may apply to the apparatus which can be displayed as another visible image.

  In the present embodiment, the infrared light irradiation unit 2 has been described as irradiating infrared light from the front surface of the image display surface 3. However, if the infrared light irradiation unit is incident on the imaging device, the infrared light irradiation unit is You may irradiate from the side and other directions. Further, when the display 5 is provided with a front light or a backlight, infrared light may be irradiated together with visible light.

(Other embodiments)
In each of the embodiments described above, the infrared light irradiation unit 2 has been described as irradiating infrared light. However, using a light source that outputs both infrared light and visible light, irradiation is performed through a visible light cut filter. May be. In each of the above-described embodiments, the infrared light irradiation unit 2 and the infrared light detection unit 6 are described as separate housings. However, the infrared light irradiation unit 2 and the infrared light detection unit 6 May be the same casing or all may be the same casing.

  In each of the embodiments described above, infrared light is used as invisible light, but other invisible light such as ultraviolet light may be used. In each embodiment, the security information has been described as information indicating permission or non-permission of image capturing. On the other hand, whether or not to permit image display is also indicated as security information. If image display is not permitted, neither image display nor infrared light irradiation is performed. Good.

  In the above-described embodiments, the imaging non-permission area and the infrared light irradiation area are described as the same area, but the infrared light irradiation area may be larger than the imaging non-permission area. Furthermore, in each embodiment, the infrared light detection result has been described as indicating the region on the image display surface 3 that is irradiated with infrared light and the region that is not irradiated. On the other hand, when permission or non-permission of photographing is defined for the entire image, it may indicate whether or not the entire image display surface 3 is irradiated.

  Further, in each of the above-described embodiments, the detection result of the infrared light has been described as indicating the area on the image display surface 3 that is irradiated with the infrared light and the area that is not irradiated. On the other hand, the intensity of infrared light may be detected, and an area where the intensity is equal to or greater than a predetermined threshold may be indicated as an area irradiated with infrared light. In addition, the function for controlling the infrared light irradiation unit 2 may be provided by a device different from the projector 1.

  The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

102 Information Extraction Unit 104 Projection Unit 105 Control Unit

Claims (8)

Acquisition means for acquiring security information indicating a photographing non-permitted area in the image together with the image;
Output means for outputting and displaying the image acquired by the acquisition means on a display means;
Determining means for determining whether or not irradiation of invisible light affecting the photographing of the photographing non-permission area corresponding to the security information obtained by the obtaining means is performed,
The output means outputs the image to the display means after it is determined by the determination means that the invisible light is being irradiated. An instruction means for instructing the irradiation means for irradiating the invisible light to irradiate the invisible light to the imaging non-permitted area;
When the first image acquired by the acquisition unit is displayed on the display unit, and the second image to be displayed next to the first image is acquired by the acquisition unit and output by the output unit The instructing unit instructs the irradiating unit to stop the irradiation of the invisible light to the imaging non-permission area of the first image after the second image is displayed on the display unit. The image display device according to claim 1.   The image display apparatus according to claim 1, wherein the acquisition unit acquires the security information by searching for a predetermined character or pattern included in the image.   The image display apparatus according to claim 1, wherein the acquisition unit acquires the security information from metadata added to the image.   The image display apparatus according to claim 1, wherein the output unit displays the image by projecting the image acquired by the acquisition unit onto the display unit.   The determining means determines whether or not the invisible light is irradiated based on whether or not invisible light reflected from a photographing non-permitted area of the image displayed on the display means is detected. The image display device according to claim 1, wherein the image display device is a display device. An acquisition step of acquiring security information indicating a photographing non-permitted area in the image together with the image;
An output step of outputting and displaying the image acquired in the acquisition step on a display means;
A determination step of determining whether or not irradiation of invisible light affecting the shooting of the shooting non-permission area corresponding to the security information acquired in the acquisition step is performed,
In the output step, the image is output to the display means after it is determined in the determination step that the invisible light has been irradiated.   The program for operating a computer as an image display apparatus of any one of Claims 1-6.

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