JP2013190610A - Display device and distribution system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device that distributes image data in which security processing is performed for each image.SOLUTION: A display device includes an image storage unit 14 for storing image data, a display unit 18 for displaying an image based on the image data stored in the image storage unit, a recognition unit 10 for performing image recognition of the image displayed by the display unit, a security processing unit 10 for performing security processing of the image data on the image on the basis of the recognition results of the recognition unit, and a distribution unit 20 for distributing the image data having undergone the security processing from the security processing unit to a reception terminal.

Description

  The present invention relates to a display device and a distribution system.

  Conventionally, when an image is projected on a screen in a presentation, the image data of the projected image is distributed to the listener's receiving terminal, thereby displaying the same image as the projected image on the receiving terminal. A display device is known (see, for example, Patent Document 1).

Japanese Patent No. 4766108

  However, in the display device described in Patent Document 1 described above, security processing cannot be performed on image data distributed to the receiving terminal.

  An object of the present invention is to provide a display device and a distribution system for distributing image data subjected to security processing for each image.

  The display device of the present invention includes an image storage unit that stores image data, a display unit that displays an image based on the image data stored in the image storage unit, and the image displayed on the display unit. A recognition unit that performs image recognition, a security processing unit that performs security processing on the image data of the image based on a recognition result by the recognition unit, and the image that has been subjected to the security processing by the security processing unit And a distribution unit that distributes data to the receiving terminal.

  The distribution system according to the present invention includes an image storage unit that stores image data, a display unit that displays an image based on the image data stored in the image storage unit, and the image displayed on the display unit. A recognition unit that performs image recognition on the image, a security processing unit that performs security processing on the image data of the image based on a recognition result by the recognition unit, and the security processing performed by the security processing unit In order to generate a display image based on the display device having a distribution unit that distributes the image data to a receiving terminal, a terminal receiving unit that receives the image data, and the image data received by the terminal receiving unit A terminal input unit that accepts an input of a security code, and the display image from the image data using the security code An image generator for forming, characterized in that it comprises a receiving terminal and a terminal display unit for displaying the display image generated by the image generation unit.

  According to the present invention, it is possible to distribute image data subjected to security processing for each image.

It is a figure which shows the structure of the delivery system which concerns on embodiment. It is a block diagram which shows the structure of the projector which concerns on embodiment. It is a figure which shows the receiving terminal which concerns on embodiment. It is a figure which shows the image code production | generation screen which concerns on embodiment. It is a figure which shows the image which affixed the image code. It is a flowchart which shows the image data delivery process by the projector which concerns on embodiment. It is a figure which shows the example of handling of the delivery image data according to a listener's authority. It is a figure which shows the example of delivery of delivery image data. It is a figure which shows the state which affixed the image code in the pattern for misrecognition prevention. It is a figure which shows the case where a listener moves to another meeting place.

  Hereinafter, a distribution system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a distribution system according to an embodiment. The distribution system 2 includes an output device 4, a projector 6 as a display device, and a receiving terminal 8. The output device 4 is configured by a personal computer or the like that generates image data and RGB image data conforming to standards such as HDMI and DVI, and generates an image code described later. The output device 4 is communicably connected to the projector 6 via a LAN or the like, and outputs image data and an image code to the projector 6.

  FIG. 2 is a block diagram showing a configuration of the projector according to the embodiment. The projector 6 includes a control unit 10 that is configured by a microprocessor or the like and controls each unit of the projector 6 in an integrated manner. A connection unit 12, an image memory 14, a data memory 16, a projection unit 18, a distribution unit 20, and an operation unit 22 are connected to the control unit 10. The control unit 10 is connected to a storage unit (not shown) that stores a device unique number that is an identifier of the projector 6.

  The connection unit 12 is communicably connected to the output device 4 via a LAN or the like, and receives image data of an image with an image code pasted from the output device 4. The image memory 14 stores the image data of the image to be projected in association with information indicating the projection order. The data memory 16 stores distribution image data obtained by performing security processing on the image data. The projection unit 18 projects and displays an image based on the image data stored in the image memory 14 on a screen (not shown). The distribution unit 20 distributes distribution image data to the reception terminal 8 by a broadcast method using Bluetooth (registered trademark), a wireless LAN, or the like. The operation unit 22 includes operation keys for performing an operation for switching an image projected by the projection unit 18.

  FIG. 3 is a diagram illustrating a receiving terminal according to the embodiment. The receiving terminal 8 is configured by a terminal device such as a smartphone, a tablet PC, or a PDA. The receiving terminal 8 includes a display screen 24 for displaying an image based on the distribution image data received from the projector 6. The display screen 24 is provided with a touch panel 26, and the receiving terminal 8 enlarges or reduces the displayed image according to an operation via the touch panel 26.

  Next, generation of an image code by the output device 4 will be described. FIG. 4 is a diagram showing an image code generation screen according to the embodiment. When an input operation for instructing generation of an image code is performed on the output device 4, an image code generation screen shown in FIG. 4 is displayed on the monitor. Here, the image code generation screen includes an input field for setting information indicating the content of security processing performed on the distribution image data distributed from the projector 6, a check box for enabling the input content of the setting information, and security processing. An image code generation button for instructing generation of an image code including the above information is included.

  The setting information is composed of an authentication code, distribution quality, display permission period, storage permission, and redistribution restriction. The contents of the setting information differ based on the listener's authority and the like, and are differentiated according to the level of authority.

  The authentication code is a code that combines numbers and characters that are treated as security codes. The distribution quality indicates what kind of image quality the image based on the distribution image data is displayed on the receiving terminal 8. When the delivery quality is set to high image quality, the receiving terminal 8 displays an image with the same high resolution as the original image. On the other hand, when the image quality is set to be low, an image having a lower resolution than the original image is displayed on the receiving terminal 8.

  The display permission period indicates a time during which the display of the image is permitted at the reception terminal 8 after the reception terminal 8 cannot receive the distribution image data from the projector 6. For example, when the display permission period is one hour, the receiving terminal 8 can display an image based on the distribution image data at any time for one hour after the distribution image data cannot be received from the projector 6, and delete the distribution image data after one hour has passed. To do.

  The permission to save indicates whether or not the receiving terminal 8 can save the distribution image data. The redistribution restriction indicates a restriction on distribution of distribution image data from the receiving terminal 8 to another apparatus. Specifically, it restricts whether to permit distribution to other devices, the number of times distribution is permitted, and the image quality at the time of distribution.

  Here, in the image code generation screen, setting information can be individually input for each authentication code. That is, after the code A shown in FIG. 4 is selected, the setting information input field and the check box are input, and then the code B is selected to input the setting information input field with different contents. it can. For example, when generating an image code including two types of setting information, the user inputs the setting information input field and check box corresponding to code A on the image code generation screen with a keyboard, a mouse, or the like, and then the code B is selected and input is made in the setting information input field and check box corresponding to code B. Then, the user operates the image code generation button.

  When the image code generation button is operated, the output device 4 generates an image code including setting information input on the image code generation screen. Here, a QR code (registered trademark) or the like is used as the image code. Even when a plurality of setting information is set on the image code generation screen, one image code is generated, and all the setting information is included in the generated image code. After generating the image code, the output device 4 generates an image to which the image code 30 as shown in FIG. 5 is pasted, that is, image data to which image code information is added.

  Next, processing for distributing distribution image data from the projector 6 to the receiving terminal 8 will be described by taking the projector 6 used in the presentation venue as an example. FIG. 6 is a flowchart showing image data distribution processing by the projector 6 according to the embodiment. It is assumed that the authentication code is notified to the listener in advance at the venue. The authentication code is notified to the listener by mailing a pamphlet in which the authentication code is written to the listener or by distributing the pamphlet to the listener who has visited. Here, it is assumed that an authentication code corresponding to the authority of the listener is displayed on the pamphlet. The listener inputs the notified authentication code to the receiving terminal 8 and stores it in the receiving terminal 8. In addition, the authentication code is stored in the receiving terminal 8 by mailing or distributing a pamphlet describing the barcode including the authentication code information to the listener and reading the barcode by the receiving terminal 8. Good.

  Also, the listener causes the receiving terminal 8 to store an application program for receiving the distribution image data by the receiving terminal 8. If this application program can be downloaded via the Internet, for example, the URL used to download the application program is displayed in a pamphlet that notifies the authentication code, and the listener inputs the URL to the receiving terminal 8. The application program may be downloaded via the Internet. Alternatively, the URL may be notified directly to the e-mail address of the listener, and the application program may be downloaded using the URL.

  The output device 4 is connected to the projector 6 via an HDMI cable, a DVI cable, an RGB cable, or the like, and outputs image data to which image code information is added to the projector 6. As a result, the projector 6 receives the image data to which the image code information is added, and stores the received image data in the image memory 14. The image data with the image code information generated by the output device 4 is stored in a storage medium such as a USB memory, and the USB memory or the like is attached to the projector 6 so that the image data with the image code information added is stored. You may make it memorize | store in the image memory 14. FIG.

  When an operation for projecting an image is performed via the operation unit 22, the control unit 10 of the projector 6 reads out image data having the first projection order from the image memory 14. The control unit 10 projects an image based on the read image data via the projection unit 18 (step S1). The control unit 10 recognizes an image code by performing image recognition on the image data of the projected image. Then, the control unit 10 reads setting information from the image code (step S2).

  Next, the control unit 10 performs security processing on the distribution image data (step S3). That is, the control unit 10 performs compression processing on the read image data, and generates distribution image data having a resolution corresponding to the image quality corresponding to the distribution quality of the setting information. The control unit 10 adds the read setting information to the distribution image data, and performs an encryption process for encrypting the distribution image data using an authentication code.

  When a plurality of setting information is included in the image code, the control unit 10 performs security processing on each distribution image data generated for each authentication code. That is, the control unit 10 performs compression processing based on the distribution quality for each setting information on the read image data, and generates distribution image data for each distribution quality. Then, the control unit 10 adds setting information corresponding to each distribution image data, and performs an encryption process using an authentication code of the setting information corresponding to each distribution image data.

  The control unit 10 stores the distribution image data subjected to the security process in the data memory 16 (step S4). Then, the control unit 10 distributes the distribution image data to the receiving terminal 8 in the venue via the distribution unit 20 (Step S5).

  When receiving the distribution image data, the receiving terminal 8 performs a decoding process on the distribution image data using the stored authentication code. The receiving terminal 8 generates a display image based on the decoded distribution image data, and displays the generated display image on the display screen 24. Further, when the content of the received setting information indicates that storage is permitted and redistribution is not possible, the reception terminal 8 displays a “save” button on the display screen 24 as shown in FIG. If the setting information permits redistribution, a “redistribution” button is displayed. When the button operation for the “save” button is performed via the touch panel 26, the receiving terminal 8 performs a save process for storing the distribution image data in a storage unit (not shown). The receiving terminal 8 performs distribution processing for distributing the distribution image data to other devices when the button operation for the “redistribution” button is performed via the touch panel 26.

  When a plurality of distribution image data generated for each authentication code is distributed from the projector 6, the receiving terminal 8 is based on the distribution image data that can be decoded by the stored authentication code among the received distribution image data. The display image is displayed, and the distribution image data that cannot be decoded is deleted.

  The control unit 10 determines whether or not an operation for switching the projection image has been performed by the operation unit 22 (step S6). If the control unit 10 determines that an operation to switch the projection image has been performed (step S6, Yes), the image data to be projected next is read from the storage memory 14 based on the projection order of the image data (step S7), and step S1. Returning to FIG. 5, the projection of the image using the image data to be projected next and the distribution of the distribution image data are performed (steps S1 to S5).

  Further, when the control unit 10 determines that the operation of switching the projection image has not been performed (No in Step S7), whether or not a certain time (for example, 5 minutes) has elapsed since the image was distributed in Step S5. Judgment is made (step S8). When it is determined that the predetermined time has not elapsed (No at Step S8), the control unit 10 returns to Step S6 and determines whether an operation for switching the projection image has been performed.

  When the control unit 10 determines that the predetermined time has elapsed (step S8, Yes), the control unit 10 redistributes the distribution image data of the image projected via the projection unit 18 (step S9). At this time, only the latest distribution image data may be distributed, but a plurality of pieces of distribution image data such as distribution image data stored in the data memory 16 is distributed. May be.

  FIG. 7 is a diagram showing an example of handling the distribution image data according to the authority of the listener. The difference in handling of distribution image data will be described by taking as an example a case where an image code including three types of setting information is added to the image data in accordance with the authority of the listener.

  As shown in FIG. 7A, the setting information of the listener having the highest authority is the contents of the authentication code a, the distribution quality “high image quality”, the image storage “permission”, and the redistribution “unlimited permission”. . The setting information of the listener with the second highest authority is the contents of the authentication code b, the distribution quality “high image quality”, the image storage “allow image storage with reduced image quality”, and redistribution “permit twice”. . The setting information of the listener with the least authority is the contents of the authentication code c, distribution quality “medium image quality”, image storage “impossible”, and redistribution “impossible”.

  In this case, as shown in FIG. 7B, within the reception range in which the distribution image data can be received from the projector 6, the listener's receiving terminal 8 having the authentication code a and the authentication code b has a high quality image. Is displayed. In addition, an image with a low image quality is displayed on the receiving terminal 8 of the listener who has the authentication code c within the reception range of the distribution image data.

  In addition, since the receiving terminal 8 of the listener having the authentication code a can store the distribution image data with high image quality, it can display a high image quality outside the reception range as shown in FIG. The high-quality distribution image data can be redistributed. The receiving terminal 8 of the listener having the authentication code b can store the distribution image data by reducing the image quality to medium image quality, for example, and can display an image with medium image quality outside the reception range. In addition, the stored distribution image data with medium image quality can be redistributed twice. The listener receiving terminal 8 having the authentication code c cannot store or redistribute the distribution image data. Thus, it is possible to differentiate by changing the setting information according to the authority of the listener.

  According to this embodiment, distribution image data subjected to security processing based on the image code pasted for each image can be distributed to the receiving terminal 8. Moreover, since the setting information can be set according to the authority of the listener, it is possible to generate distribution image data that has been subjected to different security processing for each listener. Further, since the setting information can be differentiated for each listener, it is possible to prevent the distribution image data from being leaked to the outside by a malicious listener. In addition, since the same image as the projected image is distributed and displayed on the receiving terminal 8 in real time, the listener can listen to the image while freely enlarging or reducing the image on the display screen 24 of the receiving terminal 8.

  Further, since the setting information is included in the image code, different setting information can be determined for each image. In addition, since the image code information is added to the image data, it is not necessary to reset the distribution image data delivery setting on the projector 6 side even when the projected image is replaced on the projector 6 side.

  In the above-described embodiment, distribution image data encrypted with an authentication code as shown in FIG. 8A, or distribution image data encrypted with a different authentication code as shown in FIG. 8B. Is distributed to the receiving terminal 8. However, the present invention is not limited to this, and unencrypted distribution image data as shown in FIG. 8C may be distributed. Further, as shown in FIG. 8D, metadata including a plurality of setting information and distribution image data (distribution compressed in accordance with the highest distribution quality among the distribution qualities included in each of the plurality of setting information). The image data) may be encrypted and distributed from the projector 6 to the receiving terminal 8. In this case, the metadata and the distribution image data are encrypted at the receiving terminal 8 so that they can be decrypted using any authentication code. When the receiving terminal 8 receives the metadata and the distribution image data, the metadata and the distribution image data are decrypted using the stored authentication code, and the distribution image data is converted into the distribution image data based on the distribution quality corresponding to the own authentication code. An image based on the distribution image data obtained by compressing the distribution image data is displayed. The receiving terminal 8 can perform processing according to the setting information corresponding to the stored authentication code, for example, storage and redistribution of distribution image data. In this way, when a plurality of setting information exists, the projector 6 distributes the distribution image data with a smaller data amount than the generation of the distribution image data for each authentication code and distribution of the distribution image data. can do.

  In the above-described embodiment, the projector 6 distributes the distribution image data in response to an operation for switching the projected image. However, the projected image is an animation image or the like. Even when there is a change in a part of the image without the switching operation, distribution image data may be generated and distributed to the receiving terminal 8 when the image changes. That is, the control unit 10 may recognize a change in the projected image by image processing, generate distribution image data of the projected image when the change in the image is recognized, and perform distribution. The distribution image data may be distributed manually by the operator.

  In the above-described embodiment, the projector 6 reads the setting information from the image code recognized by the image recognition, and generates distribution image data that has been subjected to security processing. However, the projector 6 may generate distribution image data that has been subjected to security processing based on characters or marks that have been image-recognized. In this case, for example, specific characters such as “secret” included in the image and setting information for each specific mark such as a emblem are stored in a storage unit (not shown) of the projector 6. The projector 6 reads the setting information from the storage unit based on the specific character or mark recognized by the image recognition, performs security processing on the distribution image data, and generates distribution image data subjected to the security processing. It is assumed that the content of the setting information for each specific character or mark stored in the storage unit of the projector 6 can be arbitrarily changed by the operator of the projector 6.

  In the embodiment described above, the distribution image data of the image with the image code pasted is distributed. However, the present invention is not limited to this, and the distribution image data of the image without the image code may be distributed. In this case, the projector 6 deletes the image code from the original image by image processing, and generates distribution image data based on the image from which the image code has been deleted.

  In the above-described embodiment, the image code is pasted to the image as it is. However, if there is a pattern similar to the image code in the image, the projector 6 performs image recognition when the image is pasted as it is. Sometimes the content of the image code is misrecognized. Therefore, in order to prevent such erroneous recognition, the output device 4 is provided with a pattern for preventing erroneous recognition as shown in FIG. 9 in the image, and the image code is pasted in the pattern for preventing erroneous recognition. Also good.

  In the above-described embodiment, the image code is pasted to the right end of the image as shown in FIG. 5, but the position where the image code is pasted may be anywhere. If the user decides the pasting position according to the content of the image code, the image after pasting the image code, such as being able to grasp the content of the image code only by the position of the image code pasted to each image Convenience for handling can be improved.

  In the above-described embodiment, it has been described that the distribution image data is deleted after the display permission period elapses after the reception terminal 8 cannot receive the distribution image data from the projector 6. However, the present invention is not limited to this. When the terminal 8 receives the distribution image data, the terminal 8 checks whether the unique device number attached to the distribution image data is the same as the device unique number received last time. The previously received distribution image data may be deleted after the display permission period elapses from the time when this is done. Here, as shown in FIG. 10, when presentations are performed at two adjacent venues and the listener moves between the venues, the receiving terminal 8 confirms that the unique device number is the same as the device unique number received last time. If it is not the same, the distribution image data received last time is deleted after the display permission period elapses from the time when it is confirmed that they are not the same. In this way, when the listener moves to another venue, it is possible to cause the receiving terminal 8 to delete the distribution image data received at the previous venue. Here, instead of the unique device number, a code that is randomly generated each time the projector 6 is activated may be used.

  In addition, the distribution image data stored in the data memory 16 of the projector 6 in the above-described embodiment is stored for a certain period of time after being stored in the data memory 16 when the projector 6 is turned off or when the distribution is not necessary. It may be automatically deleted from the data memory 16 when (for example, 5 hours) elapses.

  Further, in the above-described embodiment, the distribution quality indicates what image quality the image based on the distribution image data is displayed on the receiving terminal 8. However, the content that restricts the enlargement / reduction of the image is added. May be. For example, in the case of high image quality, the image can be enlarged and reduced without limitation. In the case of low image quality, a reduced image may be displayed on the receiving terminal 8 and restrictions such as restricting enlargement of the displayed image may be added.

  In the above-described embodiment, the projector 6 is used as a display device. However, the present invention is not limited to this, and a display device having a large screen for displaying an image for presentation may be used.

  DESCRIPTION OF SYMBOLS 2 ... Distribution system, 4 ... Output device, 6 ... Projector, 8 ... Receiving terminal, 10 ... Control part, 12 ... Connection part, 14 ... Image memory, 16 ... Data memory, 18 ... Projection part, 20 ... Distribution part, 22 ... operation part.

Claims (9)

An image storage unit for storing image data;
A display unit for displaying an image based on the image data stored in the image storage unit;
A recognition unit that performs image recognition on the image displayed on the display unit;
A security processing unit that performs security processing on the image data of the image based on a recognition result by the recognition unit;
A display device, comprising: a distribution unit that distributes the image data subjected to the security processing by the security processing unit to a receiving terminal. The recognition unit recognizes an image code added to the image,
The display device according to claim 1, wherein the security processing unit performs the security processing on the image data of the image based on setting contents included in the image code.   The display device according to claim 2, wherein the security processing unit performs security processing for each security level on the image data using at least one security code defined for each security level. The recognition unit recognizes an image pattern included in the image,
The display device according to claim 1, wherein the security processing unit performs the security processing on the image data of the image based on setting content predetermined for each image pattern.   The display device according to claim 4, wherein the setting content determined for each image pattern is changeable.   6. The setting content includes at least one of display quality information, display period information, storage permission information, and redistribution count information. The display device according to item.   The display device according to claim 1, wherein the distribution unit distributes the image data every time a predetermined period elapses.   The display device according to claim 1, wherein the distribution unit distributes the image data every time an image displayed by the display unit is switched. An image storage unit for storing image data;
A display unit for displaying an image based on the image data stored in the image storage unit;
A recognition unit that performs image recognition on the image displayed on the display unit;
A security processing unit that performs security processing on the image data of the image based on a recognition result by the recognition unit;
A display device having a distribution unit that distributes the image data subjected to the security processing to the receiving terminal by the security processing unit;
A terminal receiver for receiving the image data;
A terminal input unit that receives an input of a security code for generating a display image based on the image data received by the terminal reception unit;
An image generation unit that generates the display image from the image data using the security code;
A distribution system comprising: a reception terminal including a terminal display unit that displays the display image generated by the image generation unit.

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