JP2011150456A - Content display device and display control method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a content display device and a display control method of the same, allowing automatic decision of whether to stop display processing and allowing display processing control corresponding to decision results, even when a user not carrying a mobile terminal or the like storing reproduction permission information is present in the vicinity of the content display device. <P>SOLUTION: A projector 130 includes: a projection unit 11 for projecting content information; an identification information holding part 141 for holding user identification information for identifying a permission user permitted with authority to view the content information projected by the projection unit 11; an imaging device 109 for photographing a photographic subject, and for output of captured image data; a user identification part 134 for deciding whether the photographic subject is the permission user based on the user identification information and the captured image data; and a projection control part 136 for stopping the projection of the content information by the projection unit 11 when the user identification part 134 cannot decide that the photographic subject is the permission user. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a content display device and a display control method thereof.

  A technique for restricting viewing of content such as video and audio by a user under a certain age or a user other than a purchaser has been proposed.

  In Patent Document 1, reproduction permission information is stored in advance in a terminal device such as a mobile phone possessed by each user, or reproduction permission information that is paired with a terminal ID is stored in advance in a content reproduction device to reproduce content. In some cases, a content reproduction apparatus is disclosed in which a content reproduction apparatus collects necessary information from nearby terminal devices and determines whether or not normal reproduction should be performed based on the information. For all viewers in the vicinity of the content playback device, the viewer's date of birth is automatically read from the mobile terminal owned by the viewer, and playback is performed after confirming that all viewers are older than the limit age. It is a technology that permits.

  According to this content reproduction device, regarding content with viewing restrictions, appropriate reproduction restriction can be performed according to the combination of the user of the mobile phone in the vicinity of the content reproduction device and the content instructed to be reproduced. it can.

JP 2008-21366 A

  However, in the content reproduction device described in Patent Document 1, if there is a viewer who does not have a portable terminal and should be restricted from viewing in the vicinity of the content reproduction device, information on the viewer cannot be acquired. For this reason, the content reproduction apparatus cannot perform appropriate viewing restrictions.

  The present invention has been made to solve the above problem, and whether or not to stop the display process even when a user who does not have a portable terminal or the like storing reproduction permission information is in the vicinity of the content display device. It is an object of the present invention to provide a content display device and a display control method thereof capable of automatically determining the display process and performing display processing control according to the determination result.

The present invention that can solve the above-described problem is a content display device that displays input content information, and has a display unit that displays the content information and an authority to view the content information displayed by the display unit. Based on an identification information holding unit that holds user identification information for identifying a permitted user, an imaging device that captures a subject and outputs captured image data, and the user identification information and the captured image data A user identification unit that determines whether or not the subject is the authorized user, and when the user identification unit cannot determine the subject as the authorized user, the display unit stops displaying the content information And a determination unit.
In the above invention, the user identification information is information for identifying authorized users who are authorized to view the content information displayed by the display unit. For this reason, it is possible to identify whether or not the imaged user is an authorized user based on the subject, that is, the captured image of the user and the user identification information registered in advance. According to the above-described configuration, the content display apparatus can automatically determine whether or not the user is an authorized user by simply capturing a captured image of the user, and appropriately control the content file display process. Therefore, unlike the conventional case, the user does not need to have a mobile phone or the like storing viewer information.

The content display device further includes a permission information holding unit that holds permission information in which the user identification information is associated with each piece of content information, and the determination unit includes the captured image data and the permission information. And determining whether the subject is the authorized user authorized to view the content information, and the determining unit determines that the subject is not authorized to view the content information. Then, the display of the content information by the display unit is stopped.
According to the above configuration, the permission information is associated with the user identification information of the authorized user for each content information. For this reason, if the imaged subject, that is, the user is an authorized user authorized to view the content to be displayed, the content information display is continued. If the user is not an authorized user, the content information display is stopped. To do. Therefore, appropriate display control can be performed for each content.

In addition, the content display device further includes a pose image holding unit that holds a pose image in which a predetermined specific pose is recorded, and the determination unit includes the specific pose recorded in the pose image. When it is determined whether or not the captured image data is included, and when it is determined that the specific pose is included in the captured image data, at least one of the identification information holding unit and the permission information holding unit, New user identification information based on the captured image is additionally stored.
In order for the captured image to include an image of a predetermined pose, it is necessary that the captured user knows the pose. A user who knows a pose is considered to have been taught a specific pose in advance by, for example, an administrator, and can be recognized as an authorized user who is authorized to view content by the administrator. According to the above configuration, the user identification information is additionally stored in at least one of the identification information holding unit and the permission information holding unit as a newly permitted user who knows the predetermined specific pose. Therefore, the authorized user identification process from the next time can be performed smoothly.

In the content display device, the determination unit determines whether a content image corresponding region corresponding to the content information is included in the captured image data, and the determination unit includes the content image corresponding region. Is not included in the captured image data, the display of the content information by the display unit is stopped.
In the above invention, when the captured image data obtained by imaging the imaging device toward the display surface does not include an image of the display surface, there is an obstacle between the imaging device and the display surface. Conceivable. For example, if the imaging surface of the imaging device is covered, the authorized authorized user identification process cannot be performed. According to the above configuration, since the display process is stopped in such a case, an act of illegally viewing the content information can be prevented.

In addition, the content display device may stop displaying the content information on the display unit when detecting an unauthorized act of illegally acquiring the content information based on the captured image data.
According to the above configuration, for example, when the voyeur action of the content information is detected as an illegal act, the display of the content information is stopped, so that the voyeur of the content can be prevented.

It should be noted that the above-described problem can also be solved by aspects other than the content display device. For example, the present invention includes an imaging device that captures an image of an object, and an identification information holding unit that holds user identification information for identifying an authorized user who is authorized to view content information. When applied to a display control method of a content display device that displays content information, the step of imaging the subject and outputting the captured image data; and the subject is permitted based on the user identification information and the captured image data. Preferably, the method includes a step of determining whether or not the user is a user, and a step of stopping display of the content information when the subject cannot be determined as the authorized user.
The content display apparatus that executes the above method can appropriately control the display of the content information based on the determination result of whether or not the imaged subject, that is, the user is an authorized user. Therefore, unlike the conventional case, the user does not need to have a mobile phone or the like storing viewer information.

The display control method of the content display device further includes a permission information holding unit that holds permission information in which the user identification information is associated with each content information, based on the captured image data and the permission information. Determining whether the subject is the authorized user authorized to view the content information, and determining that the subject is not authorized to view the content information, Preferably, the step of stopping the display of the content information.
The content display device that executes the above method continues to display the content information if the content information to be displayed is associated with the user identification information of the authorized user, and associates with the user identification information of the authorized user. If not, the display of the content information is stopped. Therefore, appropriate display processing control can be performed for each content.

It is a schematic diagram which shows the outline of the conference room in which the projector of this embodiment is installed. It is a block diagram which shows the internal structure of the projector of this embodiment. It is a software hierarchy figure explaining the application execution environment of the projector of this embodiment. It is a block diagram for demonstrating the projection control function of the projector of this embodiment. It is an example of the user identification information which the identification information holding part hold | maintains. It is an example of the user identification information which the permission information holding part hold | maintains. It is a flowchart for demonstrating the projection control process which the projector of this embodiment performs. It is a flowchart for demonstrating the operation confirmation process of an imaging device. It is a flowchart for demonstrating an image registration process. It is a flowchart for demonstrating the process which detects the act which voyeurs content, and stops the projection of a content. It is a block diagram which shows the internal structure of the projector of a modification. It is a block diagram for demonstrating the projection control function of the projector of a modification.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a content display device and a display control method thereof according to the present invention will be described in detail with reference to the drawings. In the following description, a projector that displays an image based on a content file (content information) by projecting it onto a projection surface such as a screen will be described as an example of the content display device.

(Overview of the projection control function provided by the projector of this embodiment)
As shown in FIG. 1, the projector 130 according to the present embodiment is installed in, for example, a conference room 100, and can enlarge and project content information on a screen SC. In the scene of FIG. 1, the users a to g are seated around the table 150 and see the content information projected on the screen SC.

  When the user h and the user i enter the conference room 100 from the entrance 152 while projecting the content information, the projector 130 determines whether or not the user is authorized to view the currently projected content information. When an unauthorized person enters the room, projection control is performed to stop the content information projection process. Further, the projector 130 determines whether or not there is a person who is not authorized to view the content information among the users a to g, and if the person who is not authorized to view the content information is detected, the content information It is also possible to control not to perform the projection process.

  Specifically, the projector 130 captures the faces of the user h and the user i who have entered the room using the imaging device 109 and outputs captured image data. Based on the captured image data, the user h and the user i Determines whether the user is authorized to view the projected image.

(About the internal configuration of the projector)
Next, the internal configuration of the projector 130 will be described.
As shown in FIG. 3, the projector 130 includes a control unit 10, a projection unit 11 (display unit), an imaging device 109, an expansion slot 12, a network card 13, and a flash ROM 14.

  The control unit 10 centrally controls each unit of the projector 130, a CPU 15 as an arithmetic processing processor, a ROM 17 in which a control program (so-called firmware) executed by the CPU 15 is stored, and a work area of the CPU 15. And a RAM 16 for temporarily storing calculation results and various data.

  The projection unit 11 modulates image light by modulating a light source emitted from a light source such as a discharge light-emitting light source lamp, a solid light emitting element such as an LED (Light Emitting Diode), and the like based on an image signal. A light modulation device to be formed (for example, a liquid crystal panel, a liquid crystal light valve provided with an incident-side polarizing plate and an emission-side polarizing plate, a device using a micromirror, etc.) and a projection lens that enlarges and projects image light Configured.

  The expansion slot 12 is a socket provided in the projector 130 and into which a card-type circuit for expanding the function of the projector 130 is inserted and removed. The network card 13 is inserted into the expansion slot 12. ing.

  The network card 13 includes a data communication unit 18 and a peripheral device connection unit 19, and has a function of data communication with the content server 200 and the like via the network 2 laid on the premises, and a function of connecting peripheral devices. Is. That is, the data communication unit 18 includes a network controller 21 that performs signal processing based on a predetermined communication protocol such as TCP / IP, and a communication I / F 22 that is connected to the network 2 by wire or wirelessly. Has been.

  The imaging device 109 includes an imaging element configured by a complementary metal oxide semiconductor (CMOS) or a charge coupled device (CCD) and an optical system that guides light from the subject to the imaging element, and follows the instruction from the control unit 10. Is captured and the captured image data is output. The captured image data is transferred to the captured image editing unit 133 via the data receiving unit 131. The data receiving unit 131 and the captured image editing unit 133 will be described later.

  The peripheral device connection unit 19 is for connecting peripheral devices. For example, a connection I / F controller 23 that executes signal processing in accordance with a predetermined standard such as a USB standard or an IEEE 1394 standard, and a connection between the peripheral device and the peripheral device. A plurality of (two in the illustrated example) connection connectors 25 are provided. In this embodiment, an input device 90 such as a mouse or a keyboard is connected as a peripheral device.

  The flash ROM 14 is a rewritable nonvolatile memory in which various applications are stored. These applications are recorded on a recording medium 26 such as a memory card and distributed, or distributed through an electric communication line such as the network 2, and the distributed application can be installed in the flash ROM 14. It is configured.

  Also, the control program stored in the ROM 17 of the control unit 10 can be distributed via the recording medium 26 or an electric communication line such as the network 2 in the same manner as the application. The control program distributed in this way is stored in the ROM 17. Is configured to be installable. When the ROM 17 is composed of an electrically rewritable non-volatile memory such as an EEPROM (Electrically Erasable Programmable ROM) or a flash memory, it can function as a storage unit in the same manner as the flash ROM 14.

  As described above, as an application stored in the flash ROM 14 or the like, it is determined whether or not the user is authorized to view the content information based on the captured image captured by the imaging device 109, and the user There is a projection control application that provides a projection control function that stops the projection processing of content information when the user is not authorized to view the content information. Next, the execution environment of this projection control application will be described with reference to FIG.

FIG. 3 is a schematic software configuration diagram showing an application execution environment of the projector 130. As shown in this figure, in the control unit 10 of the projector 130, a software platform 31 that is an interpreter environment is configured on an OS platform 30. The software platform 31 is configured as a runtime environment of the Java (registered trademark) platform, and includes a Java (registered trademark) VM (Java (registered trademark) virtual machine) 32, a library 33, and a framework group 34 as an interpreter. Configured. Java (registered trademark) is a trademark of Sun Microsystems.
The library 33 is configured to include a standard API library and a library dedicated to the projector 130. Various abstracted computer resources provided by the OS platform 30 are further abstracted by a model dedicated to the software platform 31. To provide an execution environment for applications that run on it.

  The framework group 34 includes an OSGi (Open Service Gateway initiative) framework 34a. The OSGi framework 34a operates a plurality of applications on a single Java (registered trademark) VM 32. The OSGi framework 34a provides application life cycle management, an inter-application communication function, and the like. A plurality of system services are preinstalled on the OSGi framework 34a. System services include application management services for adding, updating, and deleting new applications.

  Hereinafter, a projection control function provided by the projection control application executed in the application execution environment illustrated in FIG. 3 will be described.

Next, the projection control function provided by the above-described application will be described in detail with reference to FIG.
When the application is executed by the application execution environment of FIG. 3, as shown in FIG. 4, in the projector 130, a data reception unit 131, a content image processing unit 132, a captured image editing unit 133, a user identification unit 134, projection A determination unit 135 (determination unit), a projection control unit 136, an unauthorized act detection unit 137, and an image storage unit 140 are configured. The image storage unit 140 includes an identification information holding unit 141, a permission information holding unit 142, and a pause image holding unit 143.

  The data receiving unit 131 receives the captured image data captured by the imaging device 109 and sends the captured image data to the captured image editing unit 133. The content file is received from the content server 200 and sent to the content image processing unit 132.

  The content image processing unit 132 converts the content file received from the data receiving unit 131 into content image data that can be projected by the projection unit 11 and sends the content image data to the projection unit 11. The projection unit 11 projects a content image based on the content image data.

  The captured image editing unit 133 extracts a feature portion for comparing the captured image data received from the data receiving unit 131 with each image data stored in the image storage unit 140 or stores the feature portion in the image storage unit 140. Convert to image data format that can be used. The converted captured image data is stored in each storage area of the image storage unit 140.

  The user identification unit 134 is permitted to allow the captured user to view the content information based on the user's captured image captured by the imaging device 109 and the user identification information stored in the identification information holding unit 141. The user is identified and the identification result is sent to the projection control unit 136. For example, the captured image editing unit 133 compares the captured image data of the user received from the data receiving unit 131 with the user identification information stored in advance, and whether or not the respective characteristic portions match at a predetermined ratio or more, It is determined whether or not the user is an authorized user.

  Based on the user's captured image captured by the imaging device 109 and the permission information stored in the permission information holding unit 142, the projection determination unit 135 is permitted for the content file to be projected by the user. It is determined whether the file is a file, and the determination result is sent to the projection control unit 136. For example, the user's captured image data received from the data receiving unit 131 by the captured image editing unit 133 is compared with user identification information held in advance, and the user is determined depending on whether or not the respective characteristic portions match at a predetermined ratio or more. Is identified. Further, it is determined whether or not the specified user is permitted to view the content file to be projected.

  Further, the projection determination unit 135 determines whether or not the content information being projected is included in the captured image when the image capturing device 109 is imaged toward the screen SC on which the content information is projected, and the determination result To the projection control unit 136.

The projection control unit 136 controls the projection process of the projection unit 11 based on the identification result received from the user identification unit 134 and the determination result received from the projection determination unit 135. For example, when a result indicating that the user cannot be identified as the identification result or the content file that is the projection target as the determination result is a file that is not permitted by the user is received, the projection process is stopped for the projection unit 11. Instruct them to do so.
The projection determination unit 135 also notifies the projection unit 11 to stop the projection process when it receives a determination result indicating that the captured image obtained by capturing the screen SC does not include the content information being projected.
Further, even when an illegal act detection unit 137 described below detects an illegal act, the projection unit 11 is notified to stop the projection process.

  The cheating detector 137 detects cheating by a voyeur who voyeurs the content information projected on the screen SC. For example, when a captured image captured by the imaging device 109 includes an image of a lens of a voyeur device, or when reflected light from a lens of the voyeur device is detected, it is detected as an illegal act. An action pattern that can be identified as an illegal action is stored in a storage device (not shown), and the illegal action detection unit 137 determines whether or not the feature included in the captured image data matches the illegal action pattern.

The image storage unit 140 includes an identification information holding unit 141, a permission information holding unit 142, and a pause image holding unit 143. The identification information holding unit 141 is a storage area that holds user identification information for identifying authorized users who are authorized to view content information.
As shown in FIG. 5, in this embodiment, user identification information is face image data of a user who is authorized to view content information, and is stored together with a user ID.

  The permission information holding unit 142 is a storage area that holds permission information in which user identification information is associated with each content. As shown in FIG. 6, in this embodiment, face image data of a user who is given viewing authority is associated with each content. For example, user identification information G1 and user identification information G2 are associated with the content name “QC education B.wmv”, and user identification information G2 and user identification information G3 are associated with the content name “QC education C.wmv”. It has been. Therefore, there are two users who are permitted to view “QC education B.wmv”, user IDs “0001” and “0003”, and users who are permitted to view “QC education C.wmv” It can be seen that there are two user IDs “0003” and “0004”.

  The pose image holding unit 143 is a storage area that holds an image of a predetermined specific pose. Specific poses include, for example, a pose with the thumb of the right hand or a pose that creates a large circle using both hands.

<Projection control processing>
Next, a projection control process executed by the projector 130 according to the present embodiment will be described with reference to FIGS.

  Here, as shown in FIG. 1, the projector 130 projects the content information on the screen SC, and the users h and i enter the conference room 100 while the users a to g are viewing the content information. The case will be described on the assumption.

  For example, the imaging device 109 or the projector 130 may include a brightness sensor that detects a change in brightness when the entrance 152 of the conference room 100 is opened and closed, a sound sensor that detects an opening and closing sound of the entrance 152, and the like. For example, the process shown in FIG. 7 is started by detecting changes in these sensors.

First, the projector 130 executes an operation confirmation process of the imaging device 109 (step S11). The operation confirmation process will be described with reference to FIG.
The imaging device 109 captures the screen SC on which the content information is projected and outputs captured image data (step S41). The data receiving unit 131 of the projector 130 receives the captured image data output from the imaging device 109 and sends it to the captured image editing unit 133. The captured image editing unit 133 acquires captured image data (step S43), and the projection determining unit 135 determines whether the captured image data includes data corresponding to the projected image projected on the screen SC (step S43). S45).

  That is, the projection determination unit 135 compares the content image data image-processed by the content image processing unit 132 with the captured image data acquired by the captured image editing unit 133, and determines whether or not content information is included in the captured image. Determine.

  If the projection determination unit 135 determines that the content information is included in the captured image (step S45: Yes), the content information that should be captured if it is operating normally has been captured. It is determined that the device 109 is operating normally (step S47). On the other hand, if it is determined that the content information for projection is not included in the captured image (step S45: No), the content information that should be captured if it is operating normally has not been captured. It is determined that 109 is not operating normally (step S49). Thereby, for example, the case where the imaging device 109 is covered with a cloth or the like is set in the imaging device so as to always take a face photograph of a user who is authorized to view content information is detected. Can do.

  Next, returning to FIG. 7, when the projection determination unit 135 determines that the imaging device 109 is operating normally (step S <b> 13: Yes), the imaging device 109 images the user h and user i who have entered the room. . The captured image editing unit 133 acquires captured images including the faces of the user h and user i via the data receiving unit 131, and detects all the persons included in the captured image (step S15). If it is determined in step S13 that the imaging device 109 is not operating normally (step S13: No), projection of the content being projected is stopped (step S29).

  Next, the projection determination unit 135 determines whether or not an authorized user is identified for each content (step S17). In the projector 130, whether to identify authorized users who have the authority to view the projection image by the projector 130 or to identify authorized users who have the authority to view content information for each content is set in advance in the setting menu or the like. Can do. The projection determination unit 135 determines whether to determine whether or not each content can be viewed according to the set value.

  When identifying the authorized user for each content (step S17: Yes), the projection determining unit 135 reads the user identification information of the authorized information holding unit 142 (step S19). The face image of the user included in the captured image acquired by the captured image editing unit 133 is compared with the user identification information registered in the permission information holding unit 142, and the identification information corresponding to the user included in the captured image is registered. It is determined whether or not there is (step S21). For example, if the feature part of the face of the user h in the person detected in step S15 matches the feature part of the user identification information G1 shown in FIG.

  For example, the content name of the content information being projected is “QC education B. wmv”, and the feature portion of the face of the user h detected in step S15 matches the feature portion of the user identification information G1 shown in FIG. If so, it is determined that the user h is permitted to view the content (step S21: Yes).

  Further, it is continued to determine whether all persons detected in step S15 are authorized users (step S25). Here, since the determination for the user i is not completed (step S25: No), the same determination is performed for the user i (step S21). Then, it is determined whether viewing authority is permitted for all detected users. If viewing authority is permitted for all users (step S25: Yes), the content being projected is continuously projected (step S25). Step S27).

  By the way, as shown in FIG. 6, the user i who is determined to match the characteristic part of the user identification information G3 is authorized to view the content name “QC education C.wmv”, but the content name “QC The authority to view “Education B. wmv” is not permitted. Therefore, it is determined that the user i is not an authorized user of the content “QC education B. wmv” currently being projected (step S21: No).

  Here, in step S21, when the identification information corresponding to the user included in the captured image is not registered in the permission information holding unit 142 (step S21: No), the permission information holding unit 142 as new user identification information. It is determined whether or not to register (step S31a). For example, “Do you want to register?” Or the like is displayed on the operation display panel of the projector 130 or a part of the projection screen, and the like, and waiting for input of the registration operation. When an input of a registration operation is received (step S31a: Yes), an image registration process is started (step S33a). On the other hand, if there is no registration operation input (step S31a: No), the content projection is stopped without registering the user identification information of the user (step S29).

The image registration process in step S33a will be described with reference to FIG.
The projector 130 displays “Please take registration approval pose” or the like on a part of the operation display panel or the projection screen (step S51), and gives an imaging instruction to the imaging device 109. The imaging device 109 captures the user according to the imaging instruction (step S53), and acquires a captured image via the data receiving unit 131. Then, the captured image editing unit 133 extracts the portion of the approved pose, and the projection determining unit 135 determines whether the approved pose is correct by comparing it with the pose image held in the pose image holding unit 143 (step). S55).

  If it is determined that the approval pose is correct (step S55: Yes), it is registered (additionally stored) in the permission information holding unit 142 as new user identification information in association with the name of the content being projected. On the other hand, if it is determined that the approval pose is wrong (step S55: No), the image registration process is terminated without registering the user identification information of the user.

  Returning to FIG. 7, the image registration process ends (step S33a), and when new user identification information is registered (step S35a: Yes), the determination as to whether the user is an authorized user is continued (step S25). . When the determination of all persons is completed (step S25: Yes), the content being projected is continuously projected (step S27). If new user identification information is not registered (step S35a: No), the content projection is stopped (step S29).

  By the way, when it is not set to identify the authorized user for each content in step S17 (step S17: No), the projection determining unit 135 reads the user identification information in the identification information holding unit 141 (step S37). The face image of the user included in the captured image acquired by the captured image editing unit 133 is compared with the user identification information registered in the identification information holding unit 141, and the identification information corresponding to the user included in the captured image is registered. It is determined whether or not there is (step S38).

  For example, if the feature part of the face of the user h in the person detected in step S15 matches the feature part of the user identification information G1 shown in FIG. If there is registration in the identification information holding unit 141, it is determined that the user h can be identified (step S38: Yes), and it is determined whether or not all persons detected in step S15 can be identified (step S39).

  If the determination for user i is not completed (step S39: No), the same determination is performed for user i (step S38). It is determined whether or not all the detected users can be identified. If all the users can be identified (step S39: Yes), the content being projected is continuously projected (step S27).

  On the other hand, when the identification information corresponding to the user included in the captured image is not registered in the identification information holding unit 141, that is, when the captured person cannot be identified as the authorized user (step S38: No), new user identification is performed. It is determined whether or not the information is registered in the identification information holding unit 141 (step S31b). As for the image registration process in step S33b, the same process as in step S33a described above is executed according to the flow of FIG. In this case, since it is set to identify authorized users who have the authority to view the projected image by the projector 130 regardless of the type of content, the captured image is used as new user identification information in step S57 of FIG. It is registered in the identification information holding unit 141.

  When new user identification information is registered in the identification information holding unit 141 (step S35b: Yes), the determination as to whether the user is an authorized user is continued (step S39). When the determination of all persons is completed (step S39: Yes), the content being projected is continuously projected (step S27), and the user identification information is not registered in the identification information holding unit 141 (step S35b: No). The content projection is stopped (step S29).

Next, with reference to FIG. 10, a description will be given of processing for detecting the voyeur of the content projected on the screen SC and stopping the projection of the content.
The projector 130 of this embodiment monitors voyeurism, and performs, for example, the processing of FIG. 10 at the start of projection processing or at a predetermined timing (periodically).

  First, in order to confirm whether or not the imaging device 109 is operating normally, an operation confirmation process of the imaging device 109 is executed (step S61). As for the operation confirmation process of the imaging apparatus, the process shown in FIG. 8 is performed as described above.

  As a result of the operation confirmation process, when it is determined that the imaging device 109 is operating normally (step S63: Yes), the fraud detection unit 137 executes the fraud detection process (step S65). The fraud detection process is a process for detecting an illegal act of voyeurizing the content information projected on the screen SC. For example, the imaging device 109 is imaged toward the viewing user, and it is determined whether or not an image such as a lens of a voyeur device is included in the captured image obtained by capturing the viewing user, or imaging that captures the viewing user Based on the image, the reflected light from the lens of the voyeur equipment is detected.

  If the cheating detector 137 detects cheating, it is considered that a voyeur has been detected among the users viewing the content (step S67: Yes), and the projection processing is stopped if the content is being projected (step S67: Yes). Step S69). On the other hand, if the imaging device 109 is not operating normally in step S63 (step S63: No), or if no cheating is detected (step S67: No), the process ends.

  Thus, in the above embodiment, the user identification information is image information for identifying authorized users who are authorized to view content information. For this reason, if the characteristic part of a user's captured image and the characteristic part of user identification information correspond, it can identify that the imaged user is an authorized user. That is, simply by capturing a captured image of the user, the projector 130 can automatically determine whether or not the user is a permitted user and appropriately control the content projection processing. Therefore, unlike the conventional case, the user does not need to have a mobile phone or the like storing viewer information.

  In addition, the permission information stored in the permission information holding unit 142 is associated with user identification information of an authorized user for each type of content. Therefore, the projection process is continued if the content to be projected is associated with the user identification information of the authorized user, and the projection process is stopped if the content is not associated with the user identification information of the authorized user. Therefore, appropriate display processing control can be performed for each content.

  Further, when an image of a specific pose determined in advance is included in the captured image, the captured image of the user is additionally registered as new user identification information. Therefore, it is possible to smoothly perform the authorized user identification process from the next time onward.

  In addition, when the captured image captured by the imaging device 109 facing the screen SC does not include the content information projected on the projection plane, there is some obstacle between the imaging device 109 and the screen SC. it seems to do. In the above embodiment, since the projection processing is stopped in such a case, viewing of content by unauthorized means can be prevented.

  Further, in the above embodiment, since the projection process is stopped when a voyeur action is detected, it is possible to prevent content voyeurism by unauthorized means.

<Modification 1>
In the above embodiment, the projector 130 includes the imaging device 109. However, the imaging device 109 may be a peripheral device connected to the peripheral device connection unit 19 as illustrated in FIG. In this case, the captured image data output by the imaging device 109 is input to the connection I / F controller 23 through the peripheral device connection unit 19. Further, the captured image data is transferred to the control unit 10 via the expansion slot 12 and reaches a data receiving unit 131 configured in the control unit 10 as shown in FIG.

  The imaging device 109 may be a surveillance camera or a Web camera, or may be a 360 degree camera that can capture the entire conference room 100 at a time.

<Modification 2>
In the above-described embodiment, the projector 130 is illustrated as an example of the content display device. However, the projector 130 is not limited to the projector 130 and can be applied to general display devices such as a liquid crystal display and a plasma display.

<Modification 3>
In the above embodiment, the projector 130 that displays the content information is exemplified, but the invention is not limited to this. For example, the content file may include audio information along with visually recognizable information such as characters, graphics, and images. The projector 130 capable of handling such content files preferably includes an audio output device (not shown) in addition to the projection unit 11. According to such a configuration, the projector 130 can identify an authorized user and control viewing of content information in the same procedure as the projection control process described in the above embodiment. Furthermore, it is possible to individually restrict viewing of image information and audio information included in the content information. For example, the user h is authorized to view an image recorded in a content file whose content name is “QC education B.wmv”, but is authorized to listen to the sound recorded in “QC education B.wmv”. It is also possible to set a viewing restriction such as not permitting.

10: control unit, 11: projection unit (display unit), 12: expansion slot, 13: network card, 14: flash ROM, 100: conference room, 109: imaging device, 130: projector (content display device), 131: Data receiving unit, 132: content image processing unit, 133: captured image editing unit, 134: user identification unit, 135: projection determination unit (determination unit), 136: projection control unit, 137: fraud detection unit, 140: image Storage unit, 141: identification information holding unit, 142: permission information holding unit, 143: pause image holding unit, 200: content server, G1 to G4: user identification information

Claims (7)

A content display device that displays input content information,
A display unit for displaying the content information;
An identification information holding unit for holding user identification information for identifying an authorized user authorized to view the content information displayed by the display unit;
An imaging device that shoots a subject and outputs captured image data;
A user identification unit that determines whether the subject is the authorized user based on the user identification information and the captured image data;
A determination unit for stopping display of the content information by the display unit when the subject cannot be determined as the authorized user in the user identification unit;
A content display device comprising: The content display device according to claim 2,
A permission information holding unit for holding permission information in which the user identification information is associated with each content information;
The determination unit determines whether the subject is authorized to view the content information based on the captured image data and the permission information;
When the determination unit determines that the subject is not authorized to view the content information, the content display device stops display of the content information by the display unit. The content display device according to claim 1 or 2,
A pose image holding unit for holding a pose image in which a predetermined specific pose is recorded;
The determination unit determines whether the specific pose recorded in the pose image is included in the captured image data, and determines that the specific pose is included in the captured image data. A content display apparatus, wherein new user identification information based on the captured image data is additionally stored in at least one of the identification information holding unit and the permission information holding unit. The content display device according to any one of claims 1 to 3,
The determination unit determines whether or not a content image corresponding region corresponding to the content information is included in the captured image data,
When the determination unit determines that the content image corresponding region is not included in the captured image data, the content display device stops display of the content information by the display unit. The content display device according to any one of claims 1 to 4,
A content display device that stops display of the content information by the display unit when detecting an illegal act of illegally acquiring the content information based on the captured image data. Content that displays an input content information, comprising: an imaging device that images a subject; and an identification information holding unit that holds user identification information for identifying authorized users who are authorized to view the content information A display control method for a display device, comprising:
Imaging a subject and outputting captured image data;
Determining whether the subject is the authorized user based on the user identification information and the captured image data;
And a step of stopping the display of the content information when the subject cannot be determined as the authorized user. The display control method for a content display device according to claim 6, further comprising a permission information holding unit that holds permission information in which the user identification information is associated with each content information.
Determining whether the subject is authorized to view the content information based on the captured image data and the permission information;
A display control method for a content display device, comprising: a step of stopping display of the content information when it is determined that the subject is not authorized to view the content information.

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