JP2015106862A - Content information acquisition device and program, and content distribution device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a content information acquisition device capable of acquiring the relevant information of an object reflected in a content, by photographing a screen displaying the content.SOLUTION: A content information acquisition device 3 includes detection means 31 detecting a digital watermark for each region sectioned by a predetermined division number from an image captured by capturing means 30, object individual information display means 33 for acquiring the individual information of an object corresponding to the identification information specifying an object detected as a digital watermark from a server, and displaying to display means 37, and object relevant information display means 35 for acquiring the relevant information corresponding to the designated individual information by designating the position of the individual information to a user via designation means 38, and displaying in the display means 37.

Description

  The present invention is a content information acquisition apparatus capable of capturing video content in which a digital watermark is embedded and acquiring related information of an object shown in the video of the content from an acquisition source specified by the digital watermark. The present invention relates to a program and a content distribution apparatus that distributes video content by embedding the digital watermark.

  Conventionally, as a method of acquiring information related to an object in content (video content) displayed on a display device, a bar code indicating a website address for acquiring related information, a two-dimensional code, watermark information (electronic A method using a watermark is known (see Patent Document 1).

In this conventional method, a method using code information such as a barcode or a two-dimensional code displays code information in association with an object shown in content displayed on a display device. Then, the camera-equipped mobile phone captures the code information and analyzes the code information to obtain related information from the corresponding website.
Also, in this method, when there are a plurality of objects from which related information can be acquired in the screen displaying the content, code information is displayed in association with each object. Then, the camera mobile phone associates the area where the code information is displayed with the button arrangement of the mobile phone in the captured image obtained by photographing the screen on which the content is displayed, and the button pressed by the user The related information is acquired by analyzing the code information displayed in correspondence with the position of.

  Further, in the conventional method, a method using a digital watermark displays content on a screen of a display device in a state where the digital watermark is embedded in an object shown in the content. Then, the camera-equipped mobile phone captures the relevant information from the corresponding Web site by photographing the object, detecting and analyzing the digital watermark embedded in the object.

JP 2005-122516 A

  However, in the conventional method using code information, code information is displayed on the screen together with the object. Therefore, the object is covered with code information that is meaningless as information visually recognized by the user, and the user recognizes the object. There is a problem that there are things that can not be done.

  In addition, the conventional method using digital watermark does not prevent the viewing of content, but when there are multiple objects in the video of the content and related information is provided for some of the objects, There is a problem that it is impossible to recognize whether related information is associated with an object.

Furthermore, in the conventional technique using digital watermark, when there are a plurality of objects in the content video and the entire screen is shot with a camera, the terminal determines the position and number of objects associated with the related information from the shot image. I can't figure it out.
Therefore, this method specifies the position of an object with an embedded digital watermark by the position of the corresponding button, as in the conventional method using code information, or the object as in recent smartphones, tablet terminals, etc. It is not possible to specify the position of the object by a tap operation or use an object selection method such as an object.

  As described above, the conventional technique using the digital watermark can detect the digital watermark embedded for each object when the entire screen on which the content including a plurality of objects is displayed is captured. Therefore, there is a problem that corresponding related information cannot be acquired.

  The present invention has been made in view of such problems, and captures the entire screen on which content is displayed, and recognizes the position of the object associated with the related information from the video including a plurality of objects. It is an object of the present invention to provide a content information acquisition device that can acquire related information of individual objects shown on a video, a program thereof, and a content distribution device.

  In order to solve the above-described problem, the content information acquisition apparatus according to the present invention includes at least one of a range in which individual objects appearing on a video are individually contained in a region obtained by dividing a video frame by a predetermined number of divisions. Video content in which the same identification information for identifying the object is embedded in the area with a digital watermark is photographed while being displayed on a display screen of a content display device, and related information related to the object is obtained via a network. The content information acquisition apparatus to be acquired is configured to include an area-specific digital watermark detection unit, an object individual information display unit, and an object related information display unit.

  In such a configuration, the content information acquisition apparatus uses the digital watermark detection unit for each region for each region divided by a predetermined number of divisions of the video frame from the captured image (still image or moving image) captured by the capturing unit. Detect digital watermarks. Thus, the area-specific digital watermark detection means detects the digital watermark in units of predetermined areas regardless of whether or not the object is shown in the captured image. Thereby, the area-specific digital watermark detection means can recognize the position where the object is reflected in the captured image in units of predetermined areas.

Then, the content information acquisition apparatus acquires, from the server, the individual information of the object corresponding to the identification information detected as the electronic watermark by the object individual information display unit, and displays it on the display unit.
In this way, the object individual information display means identifies the digital watermark embedded in each area, not the code information such as a barcode which is meaningless as the information visually recognized by the user. Individual information such as the name of the object to be displayed is displayed on the screen. Therefore, the object individual information display unit can make the user recognize the position of the object that can provide the related information, and does not cover the screen displaying the object with information that is meaningless to the user.

  Then, the content information acquisition apparatus designates the position of the individual information displayed on the display means by the object related information display means via the designation means, so that the relation of the object corresponding to the designated individual information is displayed. Information is acquired from the server and displayed on the display means.

The content information acquisition apparatus according to the present invention omits the object individual information display unit from the configuration, and directly relates the object information from the identification information detected by the area-specific digital watermark detection unit by the object related information display unit. May be acquired from the server and displayed.
The content information acquisition apparatus according to the present invention can be operated by a content information acquisition program for causing a computer to function as each of the above-described means.

  In addition, the content distribution apparatus according to the present invention embeds identification information for identifying an object for acquiring related information related to the object with an electronic watermark embedded in the object shown on the content video via the network. A content distribution apparatus for distribution includes an embedded information storage unit, an area-specific digital watermark embedding unit, and a transmission unit.

  In such a configuration, the content distribution apparatus predetermines the identification information, the embedding time for embedding the identification information as a digital watermark in the display time of the content, and the video frame of the content in the embedded information storage unit in advance. An embedded area in which the identification information is embedded as a digital watermark is stored as embedded information. This information specifies which identification information is to be embedded in which region of which video frame of the content.

Then, the content distribution apparatus uses the digital watermark embedding unit for each area to add the identification information for each embedding area to the video frame corresponding to the embedding time of the content based on the embedding information stored in the embedding information storage unit. Embed with
Then, the content distribution apparatus transmits the content in which the identification information is embedded with a digital watermark by the transmission means.

The present invention has the following excellent effects.
According to the present invention, since the electronic watermark corresponding to the object is embedded in the area divided by the predetermined number of divisions in the spatial direction of the content, the content information acquisition device does not need to recognize the position of the object itself, The position of the object can be easily recognized as an area in which the digital watermark is embedded.
Therefore, in the content information acquisition device, the user simply captures the entire screen on which the content is displayed by the photographing means, and acquires and displays the related information of the object with the digital watermark embedded therein. be able to.

It is a whole lineblock diagram showing the composition of the contents information acquisition system concerning the embodiment of the present invention. It is a block block diagram which shows the structure of the content delivery apparatus of FIG. It is a block block diagram which shows the structure of the content display apparatus of FIG. It is a block block diagram which shows the structure of the content information acquisition apparatus of FIG. It is a figure for demonstrating the area | region which embeds a digital watermark in the frame in a content, (a) is the figure which showed the example of the embedding area which divided | segmented the frame, (b) embedded the digital watermark in each embedding area It is the figure which showed the state typically. It is a figure which shows the embedding pattern of a digital watermark, Comprising: (a) is an upper left, (b) is an upper right, (c) is a lower left, (d) is each electronic with respect to the object reflected on the lower right, respectively. It is a figure which shows the example which embedded the watermark. It is a figure which shows the embedding pattern of a digital watermark, (a) is an upper half, (b) is a lower half, (c) is a left half, (d) is with respect to the object reflected in the right half, respectively. It is a figure which shows the example which embedded each digital watermark. It is a figure which shows the example of the embedding pattern of a digital watermark, Comprising: It is a figure which shows the example which embedded the digital watermark with respect to the object reflected in the whole image | video. It is a figure which shows the example of the embedding pattern of a digital watermark, Comprising: It is a figure which shows the example which combined several embedding patterns. 5A and 5B are schematic diagrams showing processing contents of the area-specific digital watermark detection means of the content information acquisition apparatus of FIG. 4, where (a) is a captured image, (b) is a divided image, and (c) is an identification embedded with a digital watermark. Indicates information. It is a figure which shows the drawing pattern of object individual information (object name), Comprising: (a) is an upper left, (b) is an upper right, (c) is a lower left, (d) is with respect to the object reflected on the lower right, respectively. It is a figure which shows the example which drawn object individual information. It is a figure which shows the drawing pattern of object individual information (object name), (a) is reflected in the upper half, (b) is reflected in the lower half, (c) is reflected in the left half, and (d) is reflected in the right half. It is a figure which shows the example which drawn the object separate information with respect to the object. It is a figure which shows the drawing pattern of object individual information (object name), Comprising: It is a figure which shows the example which drawn object individual information with respect to the object reflected in the whole image | video. It is a figure which shows the drawing pattern of object separate information (object name), Comprising: It is a figure which shows the example which combined several drawing patterns. It is a figure which shows the other example of the drawing pattern of object separate information (object name), Comprising: (a) is an example of the embedding pattern which does not become a rectangular shape, (b), (c) is an example of the drawing pattern at that time FIG. It is a figure which shows the example of a display of the object related information display means of the content information acquisition apparatus of FIG. 4, Comprising: (a) is the screen which displayed object individual information, (b) is the screen which displayed object related information, (c) FIG. 10 is a diagram showing an example of another screen displaying object related information. It is a flowchart which shows operation | movement of the content delivery apparatus of FIG. It is a flowchart which shows operation | movement of the content information acquisition apparatus of FIG. It is a figure which shows the modification of the drawing pattern of object individual information (object name), Comprising: (a) is the example which arranged and drawn the object individual information on the image | video of content, (b) reduced the image | video of content. FIG. 4 is a diagram illustrating an example in which individual object information is arranged and drawn in a free area. It is a block block diagram which shows the other structure of a content information acquisition apparatus. FIG. 21 is a diagram illustrating a display example of the object related information display unit of the content information acquisition apparatus in FIG. 20, where (a) shows an example in which a plurality of object related information is displayed in a window provided with a tab, and (b) shows a plurality of windows. It is a figure which shows the example which displayed several object relevant information partially overlapped.

Embodiments of the present invention will be described below with reference to the drawings.
<Configuration of content information acquisition system>
Initially, with reference to FIG. 1, the structure of the content information acquisition system S which concerns on embodiment of this invention is demonstrated.
The content information acquisition system S shown in FIG. 1 specifies the acquisition source of content information from information embedded as digital watermark in the content (video content), acquires the content information, and obtains the user terminal (content information acquisition). Device).

  Here, the content information is individual information (hereinafter referred to as object individual information) such as the name of an object shown in the video of the content, or related information related to the object (hereinafter referred to as object related information). An object is an object such as a person or an object shown on the content video, and is a target to which object individual information or object related information is associated. Note that the object need not be one individual, and may be a set of a plurality of objects of the same kind (a group of objects).

  Here, the content information acquisition system S includes a content distribution device 1, a content display device 2, a content information acquisition device 3, and a plurality of servers 4. The content information acquisition device 3 and the plurality of servers 4 are It is configured to be connected via a network N.

  The content distribution apparatus 1 distributes the content by embedding at least identification information (ID) for specifying an object shown in the video of the content as a digital watermark. For example, the content distribution apparatus 1 is installed in a broadcast station and transmits a content embedded with a digital watermark as a broadcast signal.

  The content display device 2 displays content on the screen. Here, the content display device 2 receives the content transmitted from the content distribution device 1 and displays it on the screen. For example, the content display device 2 is a television receiver installed in a home, a large monitor device installed for public viewing or digital signage, and the like.

  The content information acquisition device 3 shoots the entire screen on which the content of the content display device 2 is displayed and detects an electronic watermark, thereby identifying an object shown in the captured screen, and the content information from the server 4. Is something to get. The content information acquisition apparatus 3 can be configured as a smartphone, a tablet terminal (including a tablet PC), or the like as a camera-equipped mobile terminal.

The server 4 provides content information via the network N.
The server 4 includes a Web server 4 ₁ as the acquisition source of the object individual information and object-related information such as the name of the object is reflected in the video content, the identification information embedded as an electronic watermark (ID) Web there is a search server _{4 2} which manages in association with the server _{4 first} address (URL).
Hereinafter, the configuration of each device will be described in the order of the content distribution device 1, the content display device 2, and the content information acquisition device 3. Since the server 4 can be configured as a general Web server or search server, description thereof is omitted here.

[Configuration of content distribution device]
First, the configuration of the content distribution device 1 will be described with reference to FIG. Here, the content distribution apparatus 1 includes content storage means 10, embedded information storage means 11, area-specific digital watermark embedding means 12, and transmission means 13.

  The content storage means 10 stores content and is configured by a general storage device such as a hard disk. The content storage unit 10 stores content data in association with identification information (content ID) for specifying content.

  The embedded information storage unit 11 stores embedded information in which a content ID, identification information (identification ID) for identifying an object embedded as a digital watermark in the content, an embedded time, and an embedded area are associated with each other. is there.

Here, the identification ID includes, for example, a content ID that is identification information for specifying the content and an object ID that is identification information for specifying the object shown in the video of the content.
The embedding time indicates a time during which an object is displayed and a digital watermark corresponding to the object is embedded in the content display time.

The embedding area indicates an area where the identification ID is embedded as a digital watermark in a frame (video frame) in the content. Here, the embedding area is an area unit obtained by dividing the frame into predetermined areas. For example, as shown in FIG. 5A, four regions obtained by dividing the frame F into two vertically and horizontally are set as digital watermark embedding regions (R1 to R4), and each region unit as shown in FIG. 5B. Thus, an individual digital watermark (A to B in the figure) is embedded.
When an object is arranged across a plurality of divided areas, the same digital watermark (identification ID) is embedded in the embedded area corresponding to the divided area.

  Here, an example of a digital watermark embedding pattern will be described with reference to FIGS. 6 to 9 (refer to FIG. 5 as appropriate). Here, the digital watermark embedding area is assumed to be four divided areas divided into two in the vertical and horizontal directions of the frame F shown in FIG.

When one (one group) object is arranged on one divided area of the frame F, M _A1 in FIG. _6A , M _A2 in FIG. 6B, M _A3 in FIG. As shown by the M _A4 embedding pattern 6 (d), the divided area where the object is arranged is set as an embedding area of the digital watermark.
For example, as shown in FIG. 6A, when an object (banana in the figure) is arranged in the upper left area, which is a divided area of the frame F, the area R1 is set as a digital watermark embedding area.

When one (group) object is arranged across two divided areas of the frame F, M _B1 in FIG. 7A, M _B2 in FIG. 7B, and M _B in FIG. 7C. _B3, as indicated in the embedded pattern M _B4 in FIG. 7 (d), the two divided areas the object is located in the same electronic watermark embedding region.
For example, as shown in FIG. 7A, in the case where objects (bananas in the figure) are placed across the upper left and upper right areas, which are divided areas of the frame, the areas R1 and R2 are set as the same digital watermark embedding areas. To do.

When one (group) object is arranged across the four divided areas of the frame F, as shown by the embedding pattern of _MC1 in FIG. The same digital watermark is embedded.
For example, as shown in FIG. 8, in the case where objects (bananas in the figure) are arranged across all the divided areas of the frame, the areas R1, R2, R3, and R4 are set as embedded areas of the same digital watermark.

  Here, an example is shown in which the embedding pattern of the digital watermark is set as the embedding pattern so as to be a rectangular area for the four divided areas. However, the embedding pattern is not limited to these patterns as long as the object can be arranged across the divided areas. For example, when an object is arranged in three divided areas (for example, L-shaped areas), the areas (for example, areas R1, R3, and R4) may be set as the same digital watermark embedding targets.

Further, the embedding pattern is not limited to the case where one (one group) object is arranged in the frame. In other words, any combination may be used as long as the respective embedding patterns do not overlap each other.
For example, as shown in FIG. 9, the embedding pattern M _A3 shown in FIG. 6C, the embedding pattern M _A4 shown in FIG. 6D, and the embedding pattern M _B1 shown in FIG. May be combined to set the embedding area.
Returning to FIG. 2, the description of the configuration of the content distribution apparatus 1 will be continued.

  The area-specific digital watermark embedding unit 12 embeds a digital watermark in a predetermined area unit of a frame constituting the content based on the embedded information stored in the embedded information storage unit 11. The area-specific digital watermark embedding unit 12 outputs the content embedded with the digital watermark to the transmission unit 13.

Here, the area-specific digital watermark embedding unit 12 reads the corresponding content from the content storage unit 10 by designating the content to be distributed from the outside (for example, by designating the content ID or the like), and embeds information storage unit 11 embeds a digital watermark in the content according to the embedding information corresponding to the content.
In other words, the region-specific digital watermark embedding unit 12 identifies information for identifying an object in a region (R1, R2, etc.) specified by the embedded region in the content frame corresponding to the embedded time specified by the embedded information. (Identification ID) is embedded.

  However, the area-specific digital watermark embedding means 12 provides a predetermined interval (guard band) at the boundary of each embedding area, and relatively decreases the ratio of pixels in which the digital watermark is embedded as the boundary portion is approached there. Processing is to be performed. This makes it possible to reduce the visibility of the digital watermark when the content information acquisition device 3 to be described later classifies the area from the image obtained by capturing the content and detects the digital watermark.

The area-specific digital watermark embedding unit 12 may embed the same digital watermark (identification ID) for each frame corresponding to the embedding time, or a continuous frame, for example, 15 seconds (30 frames per second, One identification ID may be embedded in 450 frames or the like. However, when the content information acquisition apparatus 3 captures content as a still image with a digital camera, it is necessary to embed an identification ID in one frame.
In addition, it is assumed in the content information acquisition apparatus 3 described later in advance which unit (one frame unit or plural frame unit) to embed a digital watermark.
As a digital watermark embedding method performed by the region-specific digital watermark embedding unit 12, a known method can be used. For example, the method disclosed in International Publication No. 05/079072 is used.

The transmission unit 13 transmits the content embedded with the digital watermark by the region-specific digital watermark embedding unit 12 to the content display device 2. Here, the transmission means 13 encodes the content, modulates it into a broadcast signal, and transmits it as a broadcast wave.
When the content distribution device 1 and the content display device 2 are connected via a communication line (for example, a wireless LAN), the transmission unit 13 is configured by a communication control unit, and the content is transmitted via the communication line. May be transmitted.

  By configuring the content distribution apparatus 1 in this way, the content distribution apparatus 1 can embed a digital watermark in units of a predetermined area with respect to an object shown in the content video. Further, the content distribution apparatus 1 can easily recognize the position of the digital watermark on the side detecting the digital watermark by embedding the digital watermark in a predetermined area.

[Configuration of content display device]
Next, the configuration of the content display device 2 will be described with reference to FIG. Here, the content display device 2 includes a receiving unit 20 and a display unit 21.

The receiving unit 20 receives content transmitted from the content distribution device 1. Here, the receiving means 20 demodulates and encodes and decodes a broadcast signal transmitted as a broadcast wave and receives it as content. The receiving unit 20 outputs the received content to the display unit 21.
When the content display device 2 and the content distribution device 1 are connected via a communication line (for example, a wireless LAN), the receiving unit 20 is configured by a communication control unit, and the content is transmitted via the communication line. May be received.

The display means 21 displays the content received by the receiving means 20 on the screen, and is composed of a general liquid crystal monitor or the like.
Note that the screen size of the display means 21 is preferably a general monitor size (for example, 32 inches [32 types]) or more in order for the content information acquisition device 3 to capture the screen.
By configuring the content display device 2 in this way, the content display device 2 can display the content transmitted from the content distribution device 1 in a form that the content information acquisition device 3 can shoot.

[Configuration of Content Information Acquisition Device]
Next, the configuration of the content information acquisition apparatus 3 will be described with reference to FIG. Here, the content information acquisition apparatus 3 includes a photographing unit 30, a region-specific digital watermark detection unit 31, a region-specific information storage unit 32, an object individual information display unit 33, a display position storage unit 34, and object related information. The display means 35, the network connection means 36, the display means 37, and the designation means 38 are provided.

The photographing means 30 photographs the display screen of the content display device 2, and is configured by a general digital camera, a video camera, or the like.
The image capturing unit 30 outputs the captured image (still image or moving image) to the area-specific digital watermark detection unit 31 and the display unit 37.

The area-specific digital watermark detection means 31 detects a digital watermark in a predetermined area unit in a photographed image photographed by the photographing means 30. Here, the area-specific digital watermark detection means 31 includes an image division means 310 and a digital watermark detection means 311.
The image dividing unit 310 divides the photographed image taken by the photographing unit 30 into predetermined areas in units of frames.
Here, the image dividing unit 310 divides a frame as a digital watermark embedding area in the same classification as the content distribution apparatus 1. That is, here, the captured image is divided into four images divided into two vertically and horizontally.
The image dividing unit 310 outputs the divided image to the digital watermark detecting unit 311.

The digital watermark detection unit 311 detects a digital watermark from the image divided by the image division unit 310. As a digital watermark detection method, a general method may be used as long as it corresponds to the digital watermark embedding method.
Here, the digital watermark detected by the digital watermark detection means 311 is reflected in the identification ID embedded in the content distribution apparatus 1, that is, the content ID that is identification information for specifying the content, and the video of the content. It is identification information comprised with object ID which is the identification information for specifying the object which is being.

This digital watermark detection means 311 detects a digital watermark in the same unit as the digital watermark embedding unit (one frame unit, plural frame units) in the content distribution apparatus 1.
This digital watermark detection means 311 associates the position of the embedded area of the digital watermark corresponding to the position of the divided image (R1 to R4: see FIG. 5A) with the detected identification ID, and stores information by region. Store in the means 32.
When the digital watermark is not detected from the digital watermark embedding area, the digital watermark detection means 311 associates a code (for example, NULL) indicating that the identification ID does not exist in the area with the area-specific information storage means. 32.
Further, when the digital watermark detection unit 311 detects the digital watermark, the digital watermark detection unit 311 notifies the object individual information display unit 33 to that effect.

Here, with reference to FIG. 10 (refer to FIG. 4 as appropriate), processing contents of the region-specific digital watermark detection means 31 will be schematically described.
FIG. 10A shows a photographed image photographed by the photographing means 30 and shows a state in which digital watermarks are embedded in four embedding areas over a plurality of frames F. FIG.
Here, in the region R1, “banana” is reflected as an object, and “A” (banana identification ID) is embedded as an identification ID. In the region R2, “apple” is shown as an object, and “B” (apple identification ID) is embedded as an identification ID. In the region R3, “grape” is reflected as an object, and “C” (grape identification ID) is embedded as an identification ID. In the region R4, “strawberry” is reflected as an object, and “D” (strawberry identification ID) is embedded as an identification ID.

Here, the image dividing unit 310 divides the photographed image of FIG. 10A into four predetermined areas for each frame F, as shown in FIG. Thereby, in each divided image, only one identification ID is embedded if a digital watermark is embedded.
Then, the digital watermark detection means 311 detects the digital watermark in each divided image of FIG. 10B, and as shown in FIG. 10C, the identification ID (A, B corresponding to each object). , C, D).
Returning to FIG. 4, the description of the configuration of the content information acquisition apparatus 3 will be continued.

  The area-specific information storage means 32 stores the digital watermark (identification ID) detected by the area-specific digital watermark detection means 31 for each embedded area of the digital watermark. This area-specific information storage means 32 can be constituted by a general memory.

  The object individual information display means 33 acquires object individual information such as the name of the object shown in the video of the content in which the digital watermark (identification ID) is embedded, and associates the acquired object individual information with the object. It is displayed on the screen. Here, the object individual information display means 33 includes ID-specific information acquisition means 330, display position determination means 331, and ID-specific information display means 332.

The ID-specific information acquisition unit 330 receives the individual object information corresponding to the identification ID via the network connection unit 36 when notified by the region-specific digital watermark detection unit 31 that the digital watermark (identification ID) has been detected. To get.
The ID-specific information acquisition unit 330 reads the identification ID stored in the area-specific information storage unit 32 and acquires the individual object information corresponding to the identification ID via the network connection unit 36.

Here, the ID-specific information acquisition means 330 searches the predetermined fixed search server 4 ₂ (server 4) for the Web server 4 ₁ (server 4) that provides the individual object information corresponding to the identification ID, and from the Web server _{4 1} to obtain the object individual information corresponding to the identification ID. Search server 4 ₂ of the fixing, for example, or may be incorporated in the content distribution apparatus 1.

Further, for example, as an electronic watermark, embeds the address indicating the acquisition source of the object individual information except the identification ID, ID-specific information acquisition unit 330, the Web server 4 ₁ specified by the address, the object individual information It is good also as acquiring.
Further, when the same identification ID is embedded in a plurality of embedding areas (for example, FIG. 7), the ID-specific information acquisition unit 330 acquires one object individual information for the identification ID.
The ID-specific information acquisition unit 330 outputs the individual object information for the acquired identification ID to the ID-specific information display unit 332.

Incidentally, when an error, such as the object individual information corresponding to the identification ID can not be acquired from the Web server 4 ₁ occurs, ID-specific information acquisition section 330, ID-specific information display means of an object individual information corresponding to the identification ID 332 Output to is not performed. At this time, the ID-specific information acquisition unit 330 notifies the display position determination unit 331 that there is no object individual information corresponding to the identification ID.

  The display position determination unit 331 determines the display position of the individual object information based on a predetermined rule when notified that the digital watermark is detected from the region-specific digital watermark detection unit 31.

Here, when the identification ID is embedded only in a certain area, the display position determining unit 331 sets the position on the area (for example, the center of the area) as the display position of the object individual information.
Further, when the same identification ID is embedded in a plurality of areas, the display position determining unit 331 sets a predetermined position for the plurality of areas as the display position of the object individual information.
For example, when a plurality of areas embedded with the same identification ID are connected to form a rectangular shape as a whole, the display position determining unit 331 uses the position on the rectangular area (for example, the center of the rectangular area) as an object. The display position of individual information.

Further, for example, when a plurality of regions embedded with the same identification ID are not connected to form a rectangular shape as a whole (such as an L-shape), the display position determining unit 331 uses the plurality of regions with the identification ID embedded therein. In the above, the position (for example, the center of the area) on the reference area where the number of areas in which the identification ID is embedded in the horizontal direction and the vertical direction of the reference area is the maximum is set as the reference area. Display position.
In addition, when a plurality of areas in which the same identification ID is embedded do not have a rectangular shape, the display position determining unit 331 may use the center of gravity of the figure formed by the plurality of areas as the display position of the individual object information.
The display position determination unit 331 outputs the display position of the individual object information corresponding to the identification ID to the ID-specific information display unit 332.

The display position determination unit 331 stores the display position of the object individual information (for example, the position and size of the tag of the identification ID) in the display position storage unit 34 in association with the identification ID.
When the display position determination unit 331 is notified from the ID-specific information acquisition unit 330 that there is no object individual information corresponding to the identification ID, the display position determination unit 331 determines the display position of the object individual information corresponding to the identification ID. Do not do it.

The ID-specific information display unit 332 displays the object individual information corresponding to the identification ID acquired by the ID-specific information acquisition unit 330 at the display position of the object individual information corresponding to the identification ID determined by the display position determination unit 331. Is.
This ID-specific information display means 332 outputs the drawing contents (object individual information [object name) and its display position to the display means 37.

  Here, the drawing content output by the ID-specific information display unit 332 is an image in which the character string is described in a tag whose size includes the character string of the object individual information (object name). The ID-specific information display unit 332 instructs the display unit 37 so that the center of the tag is the display position.

  Here, referring to FIG. 11 to FIG. 14 (refer to FIG. 4 as appropriate), the drawing pattern of the object individual information when the digital watermark (identification ID) is embedded in the embedding area described in FIG. 6 to FIG. An example will be described. 11 to 14 show the contents on the screen of the content information acquisition apparatus 3.

When one (one group) object described in FIG. 6 is arranged on one divided area of the frame F and a digital watermark is embedded only in the divided area, the object individual information display means 33 displays the object individual information display means 33 in FIG. _{D A1} of (a), _{D A2} of FIG. 11 (b), _{D A3} in FIG. 11 (c), the as shown by the drawing pattern _{D A4} of FIG. 11 (d), the inside of the four divided regions captured images Thus, the individual object information is drawn at the center of the area corresponding to the area where the digital watermark is detected.
For example, as shown in FIG. 11A, the object individual information display means 33 draws a tag T1 in which the name of the object is written at the center of the divided area D1 where the object (banana in the figure) is arranged.

Further, when one (one group) object described in FIG. 7 is arranged across the two divided areas of the frame F and the same digital watermark is embedded in the two divided areas, the object individual information display means 33 is displayed. Is divided into four as shown in the drawing pattern of D _B1 in FIG. 12A, D _B2 in FIG. 12B, D _B3 in FIG. 12C, and D _{B4 in} FIG. The individual object information is drawn at the center of the area corresponding to the two areas where the digital watermark has been detected.
For example, as shown in FIG. 12A, the object individual information display means 33 describes the name of the object at the center of the rectangular area connecting the divided areas D1 and D2 where the objects (bananas in the figure) are arranged. The drawn tag T1 is drawn.

Further, when one (one group) object described in FIG. 8 is arranged across the four divided areas of the frame F and the same digital watermark is embedded in the four divided areas, the object individual information display means 33 is displayed. As shown in the drawing pattern of D _C1 in FIG. 13, the object is located at the center of the area corresponding to the four areas where the digital watermark is detected in the area obtained by dividing the captured image into four areas, that is, the center of the entire display screen. Draw individual information.
For example, as shown in FIG. 13, the object individual information display means 33 displays the name of an object at the center of a rectangular area connecting divided areas D1, D2, D3, and D4 where objects (bananas in the figure) are arranged. The described tag T1 is drawn.

Also, when the electronic watermark is embedded in the plurality of embedding patterns described in FIG. 9, the object individual information display unit 33, as shown by the drawing pattern D _X in FIG. 14, the same watermark is detected region The individual object information is drawn at the center of each object.

Next, with reference to FIG. 15 (refer to FIG. 4 as appropriate), an example of a drawing pattern of object individual information when a plurality of regions embedded with the same identification ID are not combined to form a rectangular shape as a whole will be described. .
Here, as shown in the embedding pattern _{M L} in FIG. 15 (a), (in the figure, strawberries) objects of one (1 group) in the frame F, across the regions R1, R3, R4 of the L-shaped Assume that the same identification ID is embedded in the regions R1, R3, and R4.
In this case, for example, as shown in the drawing pattern _DL1 in FIG. 15B, the object individual information display means 33 uses the one region as a reference region in the plurality of regions in which the same identification ID is embedded, and The individual object information is drawn on the reference area where the number of areas in which the identification IDs are embedded is maximized in the horizontal direction and the vertical direction of the area. When there are a plurality of reference areas having the maximum number, the individual object information is drawn on any one of the reference areas, for example, an area located on the upper part of the screen or on the left side of the screen.

In the example of FIG. 15B, when the divided region D1 is used as the reference region, the number of regions in which the same identification ID is embedded in the horizontal direction and the vertical direction of the divided region D1 is two divided regions D1 and D3. is there.
Further, when the divided area D3 is a reference area, the number of areas in which the same identification ID is embedded in the horizontal direction and the vertical direction of the divided area D3 is three of the divided areas D1, D3, and D4.
Further, when the divided region D4 is used as a reference region, the number of regions in which the same identification ID is embedded in the horizontal direction and the vertical direction of the divided region D4 is two divided regions D3 and D4.
Therefore, in this case, the object individual information display means 33 draws the object individual information at the center of the divided area D3 in which the number of areas in which the same identification ID is embedded in the horizontal direction and the vertical direction is maximized.

Further, for example, the object individual information display means 33 draws the object individual information on the center of gravity of the figure connecting a plurality of areas in which the same identification ID is embedded, as shown in the drawing pattern _DL2 in FIG. .
In the case of the example of FIG. 15C, the object individual information display means 33 draws the object individual information on the center of gravity (area center of gravity) of the figure connecting the divided regions D1, D3, and D4. Note that the individual object information display means 33 calculates the drawing position of the individual object information as the center of gravity of the rectangular figure even when a plurality of areas embedded with the same identification ID are connected to form a rectangular shape as a whole. It is good to do.
Returning to FIG. 4, the description of the configuration of the content information acquisition apparatus 3 will be continued.

  The display position storage means 34 stores the position (for example, the position and size of the tag) where the object individual information display means 33 displays the object individual information together with the identification ID. The display position storage means 34 can be configured by a general memory or the like.

  The object related information display means 35 acquires object related information related to an object shown in the video of the content in which the digital watermark (identification ID) is embedded, and displays the acquired object related information on the screen. It is. Here, the object related information display means 35 includes related information acquisition means 350 and related information display means 351.

The related information acquisition unit 350 acquires object related information corresponding to an object designated by the user via the network connection unit 36.
Here, the related information acquisition means 350 reads the identification ID of the area corresponding to the tag position of the object individual information designated by the user via the designation means 38 from the display position storage means 34, and determines a predetermined fixed search server. in 4 ₂ (server 4), searches the Web server _{4 1} to provide an object-related information corresponding to the selected object (object name) (server 4), from the Web server _{4 1,} corresponding to the identification ID object Get related information.

In the case of providing the object individual information and the object-related information in the same Web server 4 _1, related information acquisition section 350, acquires the object-related information from the Web server 4 ₁ already been retrieved in the ID-information obtaining means 330 It is good to do.
In addition, the related information acquisition unit 350 can display not only the tag position of the object individual information specified by the user but also the object shown in the area if the position specified by the user is an area where the identification ID is embedded. May be considered as specified.
The related information acquisition unit 350 outputs the acquired object related information to the related information display unit 351.

The related information display unit 351 displays the object related information acquired by the related information acquisition unit 350.
Here, the related information display unit 351 is a browser that interprets a Web page described in a page description language such as HTML that is object related information, converts the acquired Web page into display data, and displays the display unit 37. Output to.
When displaying the object related information, the related information display unit 351 may temporarily hide the content and display the object related information on the entire display screen. Object related information may be displayed on the screen.

For example, as shown in FIG. 16A, in a state where a tag describing an object name (object individual information) is displayed on the object, the related information acquisition unit 350 describes the tag T1 selected by the user. It is assumed that a Web page (object related information) related to the object name (object individual information) is acquired.
At this time, the related information display unit 351 displays the Web page on the entire display screen as shown in FIG. Alternatively, as shown in FIG. 16C, the related information display unit 351 reduces the screen of FIG. 16A and displays a Web page in a free area.

The network connection means 36 is connected to the network N and acquires content information from the requested server 4.
The network connection means 36 accesses the server 4 specified from the object individual information display means 33 to acquire the object individual information, or accesses the server 4 specified from the object related information display means 35 to access the object related information. Or get.

The display means 37 displays the content photographed by the photographing means 30 on the screen, and is composed of a general liquid crystal monitor or the like.
When the object individual information and its display position are input from the object individual information display means 33, the display means 37 combines (superimposes) and displays the object individual information at the designated display position on the content.
In addition, when the object related information is input from the object related information display unit 35, the display unit 37 displays the object related information by hiding or reducing the content.

The designation means 38 is for designating the position of the object on the content by the user. The designation means 38 designates a position on the screen by a user tap operation input from a touch panel provided on the screen on which the display means 37 displays content.
Note that the designation unit 38 may designate a position on the screen by a mouse operation.

By configuring the content information acquisition device 3 in this way, the content information acquisition device 3 recognizes an object shown in the content video only by detecting a digital watermark in units of predetermined areas. Can do.
Further, the content information acquisition device 3 can visually present an object from which content-related information can be acquired. Therefore, the content information acquisition device 3 can acquire and present object-related information via the network N with a simple designation such as a user tap operation.

  The content information acquisition device 3 can be operated by a content information acquisition program for causing a computer to function as each of the means described above. This content information acquisition program can be recorded and distributed on a recording medium such as a CD-ROM, or distributed via a communication line. The content information acquisition program can also be distributed as an application that runs on a smartphone or tablet terminal.

<Operation of content information acquisition system>
Next, the operation of the content information acquisition system S according to the embodiment of the present invention will be described. Here, operations of the content distribution device 1 and the content information acquisition device 3 that embed and detect a digital watermark with respect to an object in the content will be described. Detailed description of the content display device 2 and the server 4 will be omitted, and will be additionally described in the operations of the content distribution device 1 and the content information acquisition device 3 as appropriate.

[Operation of content distribution device]
First, the operation of the content distribution apparatus 1 will be described with reference to FIG.
First, the content distribution apparatus 1 associates identification information (identification ID) for identifying an object embedded in the content as a digital watermark in association with the content ID for specifying the content in the embedded information storage unit 11. The embedding time and the embedding area are stored as embedding information (step S1).
Here, the identification ID is a value obtained by concatenating the content ID and the object ID for specifying the object shown in the video of the content.
As a result, in which content, in which time interval, in which region the digital watermark (identification ID) is embedded is specified.

Then, the content distribution apparatus 1 reads the content specified by the content ID from the content storage unit 10 by the area-specific digital watermark embedding unit 12 and stores the embedded information stored in the embedded information storage unit 11 corresponding to the content ID. The identification information (identification ID) corresponding to the content is embedded as a digital watermark.
At this time, the area-specific digital watermark embedding unit 12 uses identification information (identification ID) for identifying an object in a predetermined area unit specified by the embedded area in the content frame corresponding to the embedded time specified by the embedded information. ) Is embedded (step S2).
Then, the content distribution apparatus 1 transmits the content embedded with the digital watermark in step S2 to the content display apparatus 2 by the transmission unit 13 (step S3).

With the above operation, the content distribution apparatus 1 can embed a digital watermark corresponding to an object so that the object shown in the content can be recognized in units of regions obtained by dividing the content frame by a predetermined region.
The content transmitted by the content display device 2 is received by the receiving unit 20 of the content display device 2 and displayed on the display screen by the display unit 21.

[Operation of Content Information Acquisition Device]
Next, the operation of the content information acquisition apparatus 3 will be described with reference to FIG.
First, the content information acquisition device 3 captures the entire display screen of the content display device 2 with the photographing unit 30 (step S11).

Then, the content information acquisition device 3 detects the digital watermark in units of predetermined regions in the captured image captured in step S1 by the region-specific digital watermark detection means 31.
In other words, the content information acquisition device 3 divides the captured image into predetermined regions in units of frames by the image dividing unit 310 of the region-specific digital watermark detection unit 31 (step S12).
Then, the content information acquisition apparatus 3 detects the digital watermark (identification ID) from the image divided by the image division unit 310 by the digital watermark detection unit 311 of the region-specific digital watermark detection unit 31 (step S13).

Then, the content information acquisition apparatus 3 acquires the object individual information in the content in which the digital watermark (identification ID) is embedded from the server 4 by the object individual information display means 33, and corresponds the object individual information to the object. And display it on the screen.
That is, the content information acquisition device 3 sends the individual object information corresponding to the identification ID, which is the digital watermark detected in step S13, by the ID-specific information acquisition unit 330 of the individual object information display unit 33 via the network connection unit 36. And obtained from the server 4 (step S14).
Furthermore, the content information acquisition apparatus 3 determines the display position of the object individual information according to a predetermined rule for the area where the same identification ID is detected by the display position determination unit 331 of the object individual information display unit 33. (Step S15).

The content information acquisition device 3 includes the character string of the object individual information acquired in step S14 while the display unit 37 displays the content by the ID-specific information display unit 332 of the object individual information display unit 33. The tag is displayed (drawn) at the display position determined in step S15 (step S16).
By the operation so far, the individual object information (object name) is displayed as a tag on the screen of the content information acquisition device 3 for each object for which object related information can be acquired.

Then, the content information acquisition device 3 acquires the object related information of the object corresponding to the tag from the server 4 by the object related information display means 35 when the tag is selected by the user, and displays it on the screen. To do.
That is, the content information acquisition device 3 obtains the object related information corresponding to the identification ID specified by the position of the tag specified by the user via the specifying unit 38 by the related information acquiring unit 350 of the object related information display unit 35. Obtained from the server 4 via the network connection means 36 (step S17).

Then, the content information acquisition apparatus 3 displays the object related information acquired in step S17 by the related information display unit 351 (step S18).
Through the above operation, the content information acquisition device 3 visually presents an object from which content-related information can be acquired, and acquires and displays object-related information corresponding to the object selected by the user from the server 4. Can do.

[Modification]
The configuration and operation of the content information acquisition system S according to the embodiment of the present invention have been described above, but the present invention is not limited to this embodiment.
For example, here, the digital watermark embedding area has been described as four areas (see FIG. 5A) obtained by dividing the frame into two vertically and horizontally. However, the number of the embedded areas is not limited as long as it is an area having a predetermined number of divisions. For example, the embedding area may be an area obtained by dividing the frame by a larger number of divisions than 2 in each of the vertical and horizontal directions, such as nine areas obtained by dividing the frame vertically and horizontally into three. The number of vertical and horizontal divisions does not need to be the same, and the number of divisions may be different from each other in the vertical and horizontal directions, such as vertical and horizontal divisions.

Here, only the identification ID is embedded as the digital watermark in the digital watermark embedding unit 12 for each area of the content distribution apparatus 1. However, the area-specific digital watermark embedding unit 12 may embed the address (URL) of the server 4 from which the object individual information and the object related information are acquired in addition to the identification ID.
In that case, the content information acquisition device 3 stores the electronic watermark (identification ID) and address (URL) detected by the area-specific digital watermark detection means 31 in association with the embedded area in the area-specific information storage means 32. To do.

  Then, the area-specific information storage unit 330 of the object individual information display unit 33 or the related information acquisition unit 350 of the object related information display unit 35 directly stores the information by area without searching the server 4 corresponding to the identification ID. Object individual information and object-related information can be acquired from the address (URL) stored in the means 32.

  Here, the content information acquisition apparatus 3 detects the digital watermark by the area-specific digital watermark detection means 31. However, the electronic watermark may be detected by a dedicated server (not shown) on the network N. In that case, the area-specific digital watermark detection means 31 may transmit the photographed image taken by the photographing means 30 to a digital watermark detection dedicated server and acquire the detection result.

In addition, here, the content information acquisition apparatus 3 displays the object individual information at the position of the content object (see FIGS. 11 to 14).
However, the object individual information is not necessarily displayed on the object. For example, as shown in FIGS. 19A and 19B, the individual object information corresponding to the object shown in the captured image may be displayed in alignment on the screen.

  In that case, the display position determination means 331 of the content information acquisition apparatus 3 does not depend on the area where the identification ID is detected, and arranges the individual object individual information at a constant interval according to the number of detected identification IDs. The display position is determined as follows. Also in this case, if the same identification ID is embedded in a plurality of areas, the display position of the individual object information corresponding to the identification ID is one.

Here, the content information acquisition apparatus 3 displays object related information at a timing when an object is designated by the user after displaying individual object information such as an object name on the screen.
However, when a digital watermark is embedded in a captured image obtained by capturing content, the object related information may be directly displayed without displaying the object individual information.

In that case, the content information acquisition apparatus may have the configuration shown in FIG. Hereinafter, the configuration of the content information acquisition apparatus 3B illustrated in FIG. 20 will be described.
The content information acquisition device 3B shown in FIG. 20 is configured by omitting the object individual information display means 33 and the display position storage means 34 from the content information acquisition device 3 described in FIG. Here, about the structure which has the same function, the same code | symbol is attached | subjected and description is abbreviate | omitted and only a different structure is demonstrated.

  The digital watermark detection means 311B of the area-specific digital watermark detection means 31B has the same function as the digital watermark detection means 311 described in FIG. 4, and the notification destination that the digital watermark has been detected is simply the object individual information display means 33. Only the object related information display means 35B is changed.

The related information acquisition unit 350B of the object related information display unit 35B has basically the same function as the related information acquisition unit 350 described in FIG. However, the related information acquisition unit 350B operates at the stage of notification that the digital watermark has been detected from the region-specific digital watermark detection unit 31B, and the object corresponding to the identification ID stored in the region-specific information storage unit 32 Related information is acquired via the network connection means 36.
At this time, when there are a plurality of identification IDs stored in the area-specific information storage unit 32, the related information acquisition unit 350B acquires object related information for the number of identification IDs. Information is to be acquired.
The related information acquisition unit 350B outputs the acquired one or more object related information to the related information display unit 351B.

Similar to the related information display unit 351 described with reference to FIG. 4, the related information display unit 351B displays object related information, and interprets a Web page described in a page description language such as HTML that is object related information. Browser.
However, since the related information display unit 351B displays a plurality of object related information, one window (display area) is provided for one object related information, and the window specified by the specifying unit 38B is the foreground. Display control is performed as follows.
In addition, the designation unit 38 described with reference to FIG. 4 designates an object, whereas the designation unit 38B functions as one for designating one of a plurality of object related information.

For example, the content information acquisition apparatus 3B uses the object related information display unit 35B to display object related information in a window W in which a tab T is provided for each of a plurality of object related information (Web pages), as shown in FIG. Is displayed. Then, the web page in the window W is switched and displayed by designating the tab T by the designating unit 38B.
Further, the content information acquisition apparatus 3B partially displays windows W, W,... For displaying a plurality of object related information (Web pages) as shown in FIG. Overlapping display. Then, the object related information display means 35B displays the window W designated by the designation means 38B in the foreground.

DESCRIPTION OF SYMBOLS 1 Content delivery apparatus 10 Content storage means 11 Embedded information storage means 12 Area-specific digital watermark embedding means 13 Transmission means 2 Content display apparatus 20 Receiving means 21 Display means 3 Content information acquisition apparatus 30 Imaging means 31 Area-specific digital watermark detection means 310 Image Division means 311 Digital watermark detection means 32 Area-specific information storage means 33 Object individual information display means 330 ID-specific information acquisition means 331 Display position determination means 332 ID-specific information display means 34 Display position storage means 35 Object-related information display means 350 Related information Acquisition means 351 Related information display means 36 Network connection means 37 Display means 38 Designation means 4 Server 4 ₁ Web server 4 ₂ Search server N Network

Claims (8)

The same identification information for identifying the object is embedded in one or more of the areas in which the individual objects appearing on the video are individually contained in the area obtained by dividing the video frame by a predetermined number of divisions with a digital watermark. A content information acquisition device that captures the video content displayed on a display screen of a content display device and acquires related information related to the object via a network,
An area-specific digital watermark detection means for detecting a digital watermark for each area divided by the predetermined number of divisions from a photographed image photographed by the photographing means;
The individual information of the object corresponding to the identification information detected as the digital watermark by the area-specific digital watermark detection means is acquired via the network from the server that provides the individual information corresponding to the identification information, and is displayed on the display means. Object individual information display means for displaying,
By specifying the position of the individual information displayed on the display means via the specifying means, the related information of the object corresponding to the specified individual information is changed to the related information corresponding to the identification information. An object-related information display means that is obtained from a server to be provided via a network and displayed on the display means,
The content information acquisition apparatus according to claim 1, wherein when the same identification information is detected in a plurality of areas, the object individual information display means acquires and displays one piece of the individual information for the identification information.   2. The content information acquisition according to claim 1, wherein the object individual information display unit draws and displays the individual information in an area where identification information corresponding to the individual information is embedded as a digital watermark. apparatus.   When the object individual information display means has a plurality of areas in which identification information corresponding to the individual information is embedded as a digital watermark, and the overall shape of the plurality of areas is a rectangular shape, the object individual information display means The content information acquisition apparatus according to claim 1, wherein the individual information is drawn and displayed.   The object individual information display means embeds the identification information when there are a plurality of areas in which identification information corresponding to the individual information is embedded as a digital watermark, and the overall shape of the plurality of areas does not become a rectangular shape. Further, in the plurality of regions, with one region as a reference region, any one of the reference regions in which the number of regions in which the identification information is embedded in the horizontal direction and the vertical direction of the reference region is maximized, The content information acquisition apparatus according to claim 1 or 2, wherein the individual information is drawn and displayed.   The object individual information display means embeds the identification information when there are a plurality of areas in which identification information corresponding to the individual information is embedded as a digital watermark, and the overall shape of the plurality of areas does not become a rectangular shape. The content information acquisition apparatus according to claim 1 or 2, wherein the individual information is drawn and displayed at a barycentric position of a figure constituted by the plurality of regions. The same identification information for identifying the object is embedded in one or more of the areas in which the individual objects appearing on the video are individually contained in the area obtained by dividing the video frame by a predetermined number of divisions with a digital watermark. A content information acquisition device that captures the video content displayed on a display screen of a content display device and acquires related information related to the object via a network,
An area-specific digital watermark detection means for detecting a digital watermark for each area divided by the predetermined number of divisions from a photographed image photographed by the photographing means;
The related information of the object corresponding to the identification information detected as the digital watermark by the area-specific digital watermark detection means is acquired from the server providing the related information corresponding to the identification information via the network, and is displayed on the display means. An object-related information display means for displaying,
The content information acquisition apparatus according to claim 1, wherein when the same identification information is detected in a plurality of areas, the object related information display means acquires and displays one piece of the related information for the identification information.   The content information acquisition program for functioning a computer as a content information acquisition apparatus as described in any one of Claims 1-5. A content distribution apparatus that embeds and distributes identification information for identifying an object for acquiring related information related to the object, embedded in a digital watermark, to the object shown on the content video,
Corresponding to the content, the identification information, an embedding time for embedding the identification information as a digital watermark in the display time of the content, and a region obtained by dividing the video frame of the content by a predetermined division number, An embedding area for embedding identification information as a digital watermark; and embedding information storage means for storing embedding information as embedding information;
Based on the embedding information stored in the embedding information storage means, an area-specific digital watermark embedding means for embedding the identification information with a digital watermark for each embedding area in a video frame corresponding to the embedding time of the content;
Transmitting means for transmitting the content in which the identification information is embedded with a digital watermark,
In the embedded information storage unit, when the object is reflected across a plurality of areas, the same identification information is stored in association with the plurality of areas.

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