JP5153723B2 - Digital watermark detection device - Google Patents

Description

The present invention relates to a digital watermark detection apparatus.

  2. Description of the Related Art Conventionally, a technique of digital watermark (hereinafter referred to as digital watermark having reshooting resistance) that can be detected from video after shooting (hereinafter referred to as reshooting) has been proposed (see, for example, Patent Document 1).

International Publication No. 05/079072

  However, conventionally, there has been no mention of a technique for efficiently detecting illegal copying of content using digital watermarks having resistance to reshooting, and there has been a problem that digital watermarks having resistance to reshooting cannot be used effectively. It was.

The present invention has been made to solve the above problems, the child watermark detection apparatus electrodeposition can be built efficiently system for seized illegal copying of the contents by utilizing the digital watermark having a re-pickup resistance The purpose is to obtain.

The digital watermark detection apparatus according to the present invention provides a moving image content name of a moving image content and a copyright of the moving image content by a digital watermark that can be detected even if the original image of the moving image content is re-captured or recompressed. Copyright information embedding unit that embeds copyright information that is at least one of the names, and a digital watermark that can be detected even if the original image of the moving image content is re-photographed or recompressed. A moving image in which copyright information is embedded by a digital watermark embedding device including a data embedding unit that embeds data using a signal used for spatial or temporal alignment of moving image content as data indicating whether or not to embed an electronic watermark detection apparatus for detecting the copyright information from the content, yield of collecting moving image content through a communication network And parts, and a display unit for displaying the moving image content collected by the collection unit, a photographing unit for photographing the screen of moving image content displayed on the display unit, from the moving image content re Tosa by the imaging unit, an electronic A signal used for spatial or temporal alignment of moving image content is detected according to a detection algorithm corresponding to an electronic watermark embedding algorithm by the watermark embedding device, and a spatial or temporal alignment defined by the signal or Depending on whether or not the alignment of both of these is successful, an embedding presence / absence determining unit that determines whether or not copyright information is embedded, and detection when the embedding presence / absence determining unit determines that the copyright information is embedded according to the algorithm, the copyright information detection section that detects the copyright information from the moving image content re Tosa by the imaging unit The provided, as an embedded algorithm, for each frame image of the moving image content, the one region of the frame image embedded data indicating the embedding whether copyright information, and to embed copyright information in the other region of the frame image Is.

According to the present invention, the copyright information of the moving image content is embedded with a digital watermark that can be detected even if the original image of the moving image content is re-captured or recompressed. Since the copyright information is detected after it is determined that the copyright information is embedded based on the detection result of the data indicating the presence / absence of the embedding, the reprinting or recompression is performed. However, it is possible to construct a system that efficiently detects illegal copies of content using digital watermarks that can be detected even when re-shooting, and that there is no problem that one embedded data negates the other embedded data. effective.

It is a block diagram which shows the structure of the digital watermark embedding apparatus by Embodiment 1 of this invention. It is a figure which shows an example of an embedding process. It is a figure which shows the other example of an embedding process. It is a figure which shows the other example of an embedding process. It is a block diagram which shows the structure of the digital watermark detection apparatus by Embodiment 2 of this invention.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a digital watermark embedding apparatus according to Embodiment 1 of the present invention. In FIG. 1, a digital watermark embedding apparatus 1 according to Embodiment 1 is a digital watermark having reshooting resistance that can verify whether copyright information of content is embedded with a digital watermark and detect the copyright information. Is embedded in the content, and the digital watermark embedding unit 11 includes a data embedding unit 111 and a copyright information embedding unit 112.

  The data embedding unit 111 embeds data indicating whether or not copyright information is embedded in a moving image content to be embedded with an electronic watermark using an electronic watermark having reshooting resistance, and a moving image in which only data indicating whether or not the embedded information is embedded is embedded Means for generating content a. Here, for example, 16-bit data 0xFFFF is embedded as data indicating whether or not copyright information is embedded. As a digital watermark algorithm having reshooting resistance, the method disclosed in Patent Document 1 is used.

  The copyright information embedding unit 112 embeds the copyright information of the moving image content with the digital watermark having reshooting resistance with respect to the moving image content a in which only the data indicating the embedding is embedded, Means for generating content. As copyright information, data representing a copyright holder name and a moving image content name is embedded. As a digital watermark algorithm having reshooting resistance, the method disclosed in Patent Document 1 is used.

  As copyright information, in addition to the data indicating the copyright owner name and moving image content name, more detailed information such as information indicating the scope of the copyright and details of the copyright content claimed by the copyright owner are included. Any copyright information may be used.

  If data 0xFFFF is detected at the time of digital watermark detection, it can be determined that there is a high possibility that copyright information is embedded in the moving image content. It should be noted that no error detection data or error correction data is added to the 16-bit data that indicates the presence or absence of embedding. Therefore, at the time of detection, data 0xFFFF is detected with a probability of 1/65536 even though data indicating the presence or absence of embedding is not embedded.

  Although the method disclosed in Patent Document 1 is used as a digital watermark algorithm having reshooting resistance, any algorithm that can realize a digital watermark having reshooting resistance or low bit rate compression resistance can be used. A simple algorithm may be used.

  Further, the data indicating whether or not to embed is embedded before the copyright information. However, the copyright information may be embedded first and the data indicating whether or not to be embedded may be embedded later. In this case, the copyright information embedding unit 112 embeds only the copyright information in the moving image content, and outputs the moving image content in which only the copyright information is embedded. Thereafter, the data embedding unit 111 embeds data indicating the presence / absence of embedding in the moving image content in which only the copyright information is embedded, and outputs the embedded moving image content as a digital watermark embedded moving image content.

  Furthermore, the data indicating whether or not to embed may be embedded at the same time as the copyright information. If the data indicating whether or not to embed is embedded so as to be detectable regardless of the copyright information, the digital watermark embedding unit 11 may arbitrarily It can be set as this structure.

  Note that the data embedding unit 111 and the copyright information embedding unit 112 read a program for embedding an electronic watermark according to the gist of the present invention into a computer and execute it on the CPU, so that the hardware and software cooperate with each other. It can be realized on the computer as a simple means.

Next, the operation will be described.
Here, an operation of embedding two types of data (data indicating whether or not to embed, copyright information) with a digital watermark having reshooting resistance will be described with a specific example.
(1) Embedding algorithm (Example 1)
FIG. 2 is a diagram illustrating an example of embedding processing, and illustrates a case where two types of data are embedded in the same frame image area. In the example shown in FIG. 2, for each frame image constituting the moving image, data indicating the presence / absence of embedding is embedded in the left half area of the frame image, and copyright information is embedded in the right half area.
(2) Embedding algorithm (example 2)
FIG. 3 is a diagram illustrating another example of the embedding process, and illustrates a case where two types of data are embedded for each frame image. In the example shown in FIG. 3, data indicating the presence / absence of embedding is embedded in odd-numbered frames constituting a moving image, and copyright information is embedded in even-numbered frames. Note that data indicating the presence or absence of embedding may be embedded in even-numbered frames, and copyright information may be embedded in odd-numbered frames.
(3) Embedding algorithm (example 3)
FIG. 4 is a diagram illustrating another example of the embedding process, and illustrates a case where two types of data are embedded in the luminance component and the color difference component of the frame, respectively. In the example shown in FIG. 4, for each frame image constituting the moving image, data indicating whether or not to embed is embedded in the luminance component of the frame image, and copyright information is embedded in the color difference component. In this case as well, data indicating the presence or absence of embedding may be embedded in the color difference component, and the copyright information may be embedded in the luminance component.

  As described above, the embedding process by the digital watermark embedding unit 11 is executed in a logically divided area on the moving image data. That is, the areas defined by the left and right areas of the frame, the odd-numbered and even-numbered frames, the luminance component, the color difference component, and the like are logically divided. Therefore, in the embedding process for these areas, there is no problem that one embedded data cancels out the other embedded data. If there is no problem of canceling each other even if both the data indicating the presence / absence of embedding and the copyright information are embedded, the contents of the embedding process are not limited to the above, and any process contents can be applied. is there.

  As described above, according to the first embodiment, a work in which copyright information of a moving image content is embedded by a digital watermark that can be detected even if the original image of the moving image content is re-captured or recompressed. A copyright information embedding unit 112; and a data embedding unit 111 that embeds data indicating whether or not copyright information is embedded using a digital watermark that can be detected even if the original image of the moving image content is re-photographed or recompressed. . With this configuration, it is possible to provide the digital watermark embedding apparatus 1 capable of constructing a system for efficiently detecting illegal copies of content by using digital watermarks having reshooting resistance.

  In the first embodiment, the case where 16-bit data 0xFFFF is used as the data indicating the presence or absence of embedding has been described. However, other bit strings may be used, and the bit string length may be an arbitrary value. For example, 32-bit data 0xFF00FF00 can be used. In this case, if 0xFF00FF00 is detected as data indicating the presence or absence of embedding at the time of detection, it can be determined that there is a high possibility that copyright information is embedded in the moving image content. At the time of detection, the probability that the data 0xFF00FF00 is detected is 1/4294967296 even though the data indicating the presence or absence of embedding is not embedded, and the probability of erroneous detection is much lower than in the case of 16-bit data.

  However, when 32-bit data is used, the amount of data to be detected increases, so that the time required for detection may increase. On the other hand, 4-bit data 0x6 can also be used. In this case, the probability of erroneous determination that the data is embedded is 1/16 even though the data is not embedded. growing. On the other hand, since the amount of data to be detected is as small as 4 bits, the time required for detection may be reduced.

  Which bit string length is optimal depends on the time required to detect copyright information, and therefore differs depending on each specific aspect. For example, if the amount of copyright information data is large and it takes a very long time to detect it, increase the bit string length of the data indicating the presence or absence of embedding to reduce the possibility of useless copyright information detection processing. Thus, the processing efficiency can be improved.

For example, the following methods are also conceivable.
Usually, in digital watermark detection from video, processing for identifying a spatial position (hereinafter referred to as spatial synchronization) and processing for recognizing a position in the time axis direction (hereinafter referred to as time synchronization). Is performed prior to detection of the actually embedded data. An electronic watermark signal embedded for performing space synchronization or time synchronization can also be used as data indicating the presence or absence of embedding. In this case, the presence / absence of embedding is determined at the time of detection depending on whether the space synchronization or the time synchronization succeeds or fails.

Embodiment 2. FIG.
In the second embodiment, moving image content is automatically collected via a communication network, and it is determined at high speed the possibility that it is a moving image content embedded with a digital watermark generated by the digital watermark embedding device according to the first embodiment. A digital watermark detection apparatus that detects copyright information embedded by the digital watermark embedding apparatus will be described.

  FIG. 5 is a block diagram showing a configuration of a digital watermark detection apparatus according to Embodiment 2 of the present invention. In FIG. 5, the digital watermark detection apparatus 2 according to Embodiment 2 determines whether or not the moving image content collected via the communication network 3 is the moving image content embedded with the digital watermark, and the moving image content embedded with the digital watermark. Is a device that detects copyright information embedded as an electronic watermark having reshooting resistance, and includes a moving image content collection unit (collection unit) 21, a moving image display unit (display unit) 22, and moving image shooting. Section (photographing section) 23 and digital watermark detection section 24.

  The moving image content collection unit 21 is a means for searching for and collecting moving image content via the communication network 3, and for moving image content corresponding to predetermined key information to a preset site on the communication network 3. Search and collect automatically. Here, the Internet 3 is used as the communication network 3, and among the moving image contents accessible via the Internet, the moving image content that may be infringed on copyright, such as the moving image content uploaded to the video posting site, is automatically selected. Shall be collected.

  The moving image display unit 22 is means for sequentially inputting the moving image contents collected by the moving image content collection unit 21 and displaying the moving image contents on a display screen of a display device capable of displaying moving images. Examples of the display device capable of displaying a moving image include a display device mounted on a computer in which the digital watermark detection device 2 is constructed, a television connected to the computer, and the like.

  The moving image capturing unit 23 is a unit that captures the moving image displayed by the moving image display unit 22 and outputs the recaptured moving image content to the digital watermark detection unit 24. The photographing unit 23 may be any photographing device capable of photographing a moving image displayed on a display screen of a display device, and examples thereof include a video camera and a moving image compatible digital camera.

  The digital watermark detection unit 24 is a unit that determines whether or not the digital watermark embedded video image content is detected and detects the digital watermark, and includes a digital watermark embedding presence / absence determination unit 241 and a copyright information detection unit 242.

  An electronic watermark embedding presence / absence determining unit (embedding presence / absence determining unit) 241 determines whether or not data indicating whether or not copyright information is embedded is embedded in the moving image content recaptured by the moving image capturing unit 23. Means. The digital watermark embedding presence / absence determination unit 241 detects data indicating the presence / absence of embedding according to the detection algorithm corresponding to the embedding algorithm by the data embedding unit 111 of the digital watermark embedding device 1 described in the first embodiment, and performs digital watermarking. Outputs whether or not embedded.

  For example, when the data indicating the presence / absence of embedding is 16-bit data 0xFFFF, if the result detected from the recaptured moving image content is data 0xFFFF, the digital watermark embedding presence / absence determination unit 241 determines that “embedding is present”. Then, this is output to the copyright information detection unit 242 as presence / absence of embedding. On the other hand, if the detection result is other than the above data, it is determined that “no embedding”, and this is output to the copyright information detection unit 242 as the presence / absence of embedding.

  The copyright information detection unit 242 is means for detecting copyright information from the moving image content determined as “embedded” by the digital watermark embedding presence / absence determination unit 241. The copyright information detection unit 242 detects and outputs copyright information according to the detection algorithm corresponding to the embedding algorithm by the copyright information embedding unit 112 of the digital watermark embedding device 1 shown in the first embodiment.

  Since the copyright information is a moving image content name or a copyright holder name, it has a data amount of several bytes at the shortest and several tens of bytes at the longest. In addition, when the attached information is included as copyright information, the amount of data may further increase to reach several hundred bytes. Thus, since copyright information has a large amount of data, it takes a certain amount of time to detect it.

  Therefore, in this second embodiment, the digital watermark embedding presence / absence determining unit 241 determines the embedding presence / absence using data (16-bit data) indicating the presence / absence of embedding, which is overwhelmingly smaller than the copyright information. The copyright information is detected only when it is determined that “there is embedded”. In this way, it is possible to screen moving image content that would be time-consuming detection of copyright information depending on the determination result of embedding / non-embedding in a short time.

  The moving image content collection unit 21, the moving image display unit 22, the moving image shooting unit 23, and the digital watermark detection unit 24 cause a computer to read a digital watermark detection program according to the gist of the present invention and cause the CPU to execute the program. Thus, it can be realized on the computer as a specific means in which hardware and software cooperate.

Next, the operation will be described.
Here, a process for detecting copyright information from moving image content in which two types of data (data indicating whether or not to embed, copyright information) is embedded with a digital watermark having reshooting resistance will be described with a specific example. .
(1) Detection algorithm (Example 1)
First, the case where the digital watermark embedding apparatus 1 according to Embodiment 1 embeds two types of data in a moving image according to the embedding algorithm shown in FIG. 2 will be described. Here, for each frame image constituting the moving image, data indicating the presence or absence of embedding is embedded in the left half area of the frame image, and copyright information is embedded in the right half area.
In this case, in the digital watermark detection apparatus 2, the digital watermark embedding presence / absence determination unit 241 determines whether or not to embed embedding for a moving image including only the left half area of each frame of the collected moving image content (re-taken). The detection process of the data shown is executed. During this process, the copyright information detection unit 242 stores a moving image including only the right half area of each frame of the collected moving image content in an internal storage device (not shown).
Thereafter, only when the digital watermark embedding presence / absence determination unit 241 determines that “embedding is present”, the copyright information detection unit 242 performs copyright information detection processing on the moving image stored in the internal storage device.

(2) Detection algorithm (Example 2)
A case will be described in which the digital watermark embedding device 1 according to the first embodiment embeds two types of data in a moving image in accordance with the embedding algorithm shown in FIG. Here, data indicating the presence / absence of embedding is embedded in odd-numbered frames constituting a moving image, and copyright information is embedded in even-numbered frames.
In this case, the digital watermark embedding presence / absence determination unit 241 applies to both the moving image including only the odd-numbered frames and the moving image including only the even-numbered frames of the collected moving image content (recaptured). Then, a process for detecting data indicating the presence / absence of embedding is executed. During this processing, the copyright information detection unit 242 stores both a moving image consisting only of odd-numbered frames and a moving image consisting only of even-numbered frames of the collected moving image content in an internal storage device (not shown). accumulate.
Thereafter, only when the digital watermark embedding presence / absence determination unit 241 determines that “embedding is present” from the odd-numbered frame, the copyright information detection unit 242 includes data indicating the presence / absence of embedding among the moving images stored in the internal storage device. Copyright information detection processing is performed on a moving image (moving image of an even-numbered frame) that is different from the one in which is detected.

(3) Detection algorithm (Example 3)
A case where the digital watermark embedding apparatus 1 according to the first embodiment embeds two types of data in a moving image according to the embedding algorithm shown in FIG. 4 will be described. Here, for each frame image constituting the moving image, data indicating the presence / absence of embedding is embedded in the luminance component of the frame image, and copyright information is embedded in the color difference component.
In this case, the digital watermark embedding presence / absence determination unit 241 performs a process of detecting data indicating the presence / absence of embedding of a moving image including only the luminance component of the collected moving image content (retaken). During this process, the copyright information detection unit 242 accumulates a moving image consisting only of the color difference components of the collected moving image content in an internal storage device (not shown).
Thereafter, only when the digital watermark embedding presence / absence determination unit 241 determines that “embedding is present”, the copyright information detection unit 242 performs copyright information detection processing on the moving image stored in the internal storage device.

  In addition, as described in the first embodiment, when the digital watermark signal for space synchronization or time synchronization is data indicating the presence / absence of embedding, if the space synchronization or time synchronization is successful, the embedding presence / absence is set to “embedding”. If it is determined as “present” and fails, the presence / absence of embedding may be determined as “not embedded”. Not limited to this, any detection algorithm can be used as long as it is a method corresponding to the embedding algorithm assumed by the digital watermark detection apparatus 1.

  As described above, according to the second embodiment, the moving image content collecting unit 21 that collects moving image content via the communication network 3 and the digital watermark embedding by the digital watermark embedding device 1 according to the first embodiment. According to a detection algorithm corresponding to the algorithm, data indicating whether or not copyright information is embedded is detected from the moving image content collected by the moving image content collection unit 21, and the copyright information is embedded in the moving image content based on the detection result. If the digital watermark embedding / non-embedding determining unit 241 determines whether the copyright information is embedded by the electronic watermark embedding / non-embedding determining unit 241, the copyright from the moving image content is determined according to the detection algorithm. And a copyright information detection unit 242 for detecting information. With this configuration, it is possible to provide the digital watermark detection apparatus 2 capable of constructing a system for efficiently detecting illegal copies of content by using digital watermarks having reshooting resistance.

  In the second embodiment, since the moving image display unit 22 and the moving image shooting unit 23 are not physically communicable, damage caused by a malicious program (such as a virus or spyware) entered from the communication network 3 Even if the apparatus in which the moving image content collection unit 21 is mounted, the digital watermark detection apparatus 2 in which the digital watermark detection unit 24 having reshooting resistance is not affected by this.

  Further, according to the second embodiment, the digital watermark embedding presence / absence determining unit 241 screens a large number of moving image contents collected by the moving image content collecting unit 21, and the moving image content having a high possibility of detecting copyright information. The copyright information detection unit 242 performs copyright information detection processing only for the above. Therefore, it is possible to detect a lot of copyright information efficiently.

Further, in the digital watermark detection apparatus 2 according to the second embodiment, the moving image display unit 22 can perform display by high speed reproduction such as double speed. In this case, there is an advantage that a series of operations for sequentially detecting a plurality of moving images for digital watermark detection can be speeded up.
Note that there is a possibility that frames are thinned out from the moving image (re-captured moving image) acquired by the moving image capturing unit 23 by high-speed reproduction.
Therefore, the embedded digital watermark must be in a manner that is resistant to frame decimation. In the second embodiment, for example, since the digital watermark having reshooting resistance disclosed in Patent Document 1 is used, the frame thinning resistance can be sufficiently exhibited. Of course, as long as the digital watermark has resistance against thinning out frames and has re-shooting resistance, the processing speed can be increased by high-speed playback regardless of the type of digital watermark.

  Furthermore, in the second embodiment, among the moving image contents that the moving image content collection unit 21 can access via the Internet, the moving image content uploaded to the moving image posting site, etc. Although the case where image contents are automatically collected has been shown, the communication network 3 to be used is not limited to the Internet, and any communication network may be used. Further, not only the moving image posting site but also a moving image content may be searched for an arbitrary site, or any moving image content that can be accessed may be collected.

  Furthermore, in the second embodiment, if the digital watermark embedding presence / absence determination unit 241 obtains 16-bit data 0xFFFF as a detection result, the presence / absence of embedding is output as “with embedding”, and other data is detected. In this case, the case where the presence / absence of embedding is output as “no embedding” is shown, but the present invention is not limited to this.

For example, in addition to data 0xFFFF, when only 1 bit in 16 bits such as 0xFEFF and 0xFF7F is 0, the presence / absence of embedding is output as “detected”, and in other cases (2 bits or more in 16 bits are 0) The presence / absence of embedding may be output as “no detection”. In this way, even if there is an error of 1 bit in the detection of data indicating the presence or absence of embedding, it is corrected and it is determined that the digital watermark is embedded.
In addition, as long as a detection algorithm corresponding to the embedding algorithm by the data embedding unit 111 according to the first embodiment is provided, the digital watermark embedding presence / absence determining unit 241 can have an arbitrary configuration.

In addition, in the second embodiment, when moving image content is transferred from the moving image content collection unit 21 to the digital watermark detection unit 24 having reshooting resistance, the moving image display unit 22 and the moving image shooting unit 23 are used. However, the moving image content may be directly transferred from the moving image content collection unit 21 to the digital watermark detection unit 24.
In this case, the moving image content collection unit 21 and the digital watermark detection unit 24 are physically integrated by some method, such as being physically integrated, connected by a wired communication line, or performing wireless communication. It needs to be possible. For this reason, the digital watermark detection unit 24 may be affected by a malicious program such as a virus or spyware that enters from the communication network 3. However, there is an advantage that the processing efficiency is improved because high-speed processing can be performed as much as the device performance of the digital watermark detection unit 24 allows without depending on the moving image playback speed of the moving image display unit 22.

  DESCRIPTION OF SYMBOLS 1 Digital watermark embedding apparatus, 2 Digital watermark detection apparatus, 3 Communication network, 11 Digital watermark embedding part, 21 Moving image content collection part (collection part), 22 Moving image display part (display part), 23 Moving image imaging part (Shooting) Part), 24 digital watermark detection part, 111 data embedding part, 112 copyright information embedding part, 241 digital watermark embedding presence / absence judgment part (embedding presence / absence judgment part), 242 copyright information detection part.

Claims (3)

To the original image of the moving image content, at least one of the copyright owner name of the moving image content name and the moving image content of the moving image content by recaptured or recompression is applied detectable watermark be A copyright information embedding section for embedding copyright information,
As the data indicating whether or not the copyright information is embedded by a digital watermark that can be detected even if the re-shooting or re-compression is performed on the original image of the moving image content, the spatial or temporal of the moving image content An electronic watermark detection apparatus for detecting copyright information from moving image content in which the copyright information is embedded by an electronic watermark embedding apparatus including a data embedding unit that embeds data using a signal used for alignment. ,
A collection unit that collects the moving image content via a communication network;
A display unit for displaying the moving image content collected by the collection unit;
A photographing unit for photographing a screen of the moving image content displayed on the display unit;
A signal used for spatial or temporal alignment of the moving image content from the moving image content re-captured by the photographing unit according to a detection algorithm corresponding to a digital watermark embedding algorithm by the digital watermark embedding device. An embedding presence / absence determining unit that detects whether or not the copyright information is embedded depending on whether or not the spatial or temporal alignment defined by the signal or the alignment of both is successful.
Copyright information detection for detecting the copyright information from the moving image content re-captured by the photographing unit according to the detection algorithm when it is determined by the embedding presence / absence determining unit that the copyright information is embedded. With
As the embedding algorithm, for each frame image of the moving image content, data indicating whether or not the copyright information is embedded is embedded in one area of the frame image, and the copyright information is embedded in the other area of the frame image. An electronic watermark detection apparatus characterized by the above . At least one of the moving image content name of the moving image content and the copyright owner name of the moving image content by a digital watermark that can be detected even if the original image of the moving image content is re-captured or recompressed A copyright information embedding section for embedding copyright information,
As the data indicating whether or not the copyright information is embedded by a digital watermark that can be detected even if the re-shooting or re-compression is performed on the original image of the moving image content, the spatial or temporal of the moving image content An electronic watermark detection apparatus for detecting copyright information from moving image content in which the copyright information is embedded by an electronic watermark embedding apparatus including a data embedding unit that embeds data using a signal used for alignment. ,
A collection unit that collects the moving image content via a communication network;
A display unit for displaying the moving image content collected by the collection unit;
A photographing unit for photographing a screen of the moving image content displayed on the display unit;
A signal used for spatial or temporal alignment of the moving image content from the moving image content re-captured by the photographing unit according to a detection algorithm corresponding to a digital watermark embedding algorithm by the digital watermark embedding device. An embedding presence / absence determining unit that detects whether or not the copyright information is embedded depending on whether or not the spatial or temporal alignment defined by the signal or the alignment of both is successful.
Copyright information detection for detecting the copyright information from the moving image content re-captured by the photographing unit according to the detection algorithm when it is determined by the embedding presence / absence determining unit that the copyright information is embedded. With
An electronic watermark detection apparatus, wherein the embedding algorithm embeds data indicating whether or not the copyright information is embedded and the copyright information alternately for each frame image of the moving image content. At least one of the moving image content name of the moving image content and the copyright owner name of the moving image content by a digital watermark that can be detected even if the original image of the moving image content is re-captured or recompressed A copyright information embedding section for embedding copyright information,
As the data indicating whether or not the copyright information is embedded by a digital watermark that can be detected even if the re-shooting or re-compression is performed on the original image of the moving image content, the spatial or temporal of the moving image content An electronic watermark detection apparatus for detecting copyright information from moving image content in which the copyright information is embedded by an electronic watermark embedding apparatus including a data embedding unit that embeds data using a signal used for alignment. ,
A collection unit that collects the moving image content via a communication network;
A display unit for displaying the moving image content collected by the collection unit;
A photographing unit for photographing a screen of the moving image content displayed on the display unit;
A signal used for spatial or temporal alignment of the moving image content from the moving image content re-captured by the photographing unit according to a detection algorithm corresponding to a digital watermark embedding algorithm by the digital watermark embedding device. An embedding presence / absence determining unit that detects whether or not the copyright information is embedded depending on whether or not the spatial or temporal alignment defined by the signal or the alignment of both is successful.
Copyright information detection for detecting the copyright information from the moving image content re-captured by the photographing unit according to the detection algorithm when it is determined by the embedding presence / absence determining unit that the copyright information is embedded. With
As the embedding algorithm, for each frame image of the moving image content, data indicating whether or not the copyright information is embedded is embedded in one of a luminance component area and a color difference component area of the frame image, and the other An electronic watermark detection apparatus, wherein the copyright information is embedded in an area.

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