CN105100959A - Evidence-obtaining marking method and device and digital home theater - Google Patents
Evidence-obtaining marking method and device and digital home theater Download PDFInfo
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Abstract
The invention provides an evidence-obtaining marking method based on an invisible information embedding module arranged on a digital home theater receiving terminal server. The method comprises that the invisible information embedding module acquires a digital movie video and embeds invisible evidence obtaining mark information in the digital movie video in order to provide a basis for pirate fountainhead discrimination. As a result, a pirate fountainhead can be found out according to the invisible evidence obtaining mark information so that a basis is provided for a digital movie copyright party offering the digital home theater the service to maintain the benefit of the digital movie copyright party.
Description
Technical Field
The application relates to the technical field of digital movies, in particular to a forensic marking method and device and a digital home theater.
Background
With the improvement of living standard and technology, more and more families begin to use digital home theaters, and can enjoy the singular world of digital movie presentation without going out.
Meanwhile, there is a problem that a user using the digital home theater may illegally distribute the received digital cinema through recording, shooting, downloading and the like, and the piracy behavior damages the interests of the copyright parties of the digital cinema. Therefore, when the piracy phenomenon occurs, timely and accurate searching of the piracy source is a strong appeal of a copyright side.
However, at present, when piracy occurs in a digital movie played through a digital home theater in China, a piracy source cannot be found, so that a digital movie copyright party cannot obtain a basis for maintaining own benefits.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present application provide a forensic marking method, apparatus, and digital home theater to achieve the purpose of finding a pirate source according to invisible forensic marking information, thereby providing a basis for a digital cinema copyright owner providing services to the digital home theater to maintain own benefits, and the technical scheme is as follows:
a forensic marking method is based on an invisible information embedding module added by a digital home theater receiving terminal server, and comprises the following steps:
the invisible information embedding module acquires a digital movie video; and the number of the first and second groups,
invisible evidence obtaining mark information is embedded into the digital movie video, and evidence obtaining basis is provided for judging pirate sources.
Preferably, the process of embedding invisible mark information into the digital cinema video includes:
acquiring copyright information and sound and picture metadata information of the digital movie video, and converting the copyright information and the sound and picture metadata information into digital watermarks;
and decoding the digital movie video, and embedding the digital watermark into the decoded digital movie video.
Preferably, the copyright information includes at least: a provider or operator number of the movie service, a subscriber information number, and a play time;
the sound-picture metadata information at least includes: film video format, film video resolution, film video code rate, film audio format, film audio code rate, film audio track information, reserved bits, and data check values.
Preferably, the process of embedding invisible forensic mark information into the digital cinema video includes:
and embedding the digital watermark into the I frame in the digital movie video compressed code stream.
Preferably, after decoding the digital cinema video and embedding the digital watermark into the decoded digital cinema video, the method further includes:
and extracting the watermark of the digital movie video embedded with the digital watermark.
Preferably, the digital cinema video comprises: compressing a digital cinema video with a format of H.264 and a resolution of any one of 4k, 2k, 1080P, 1080i and 720P;
or, the compression format is MPEG-2 and the resolution is any one of 4k, 2k, 1080P, 1080i and 720P.
The utility model provides a mark device of collecting evidence, installs additional in digital home theater receiving terminal server, mark device of collecting evidence includes:
the acquisition module is used for acquiring a digital movie video;
and the embedding module is used for embedding invisible evidence obtaining mark information into the digital movie video and providing evidence obtaining basis for judging pirate sources.
Preferably, the embedded module includes:
the acquisition unit is used for acquiring copyright information and sound and picture metadata information of the digital movie video;
the conversion unit is used for converting the copyright information and the sound and picture metadata information into digital watermarks;
a decoding unit for decoding the digital cinema video;
and the embedding unit is used for embedding the digital watermark into the decoded digital movie video.
A digital home theater comprises a digital home theater receiving terminal server, a projector and a movie screen, wherein the digital home theater receiving terminal server is additionally provided with a evidence obtaining marking device.
A digital home theater comprises a digital home theater receiving terminal server and a television, wherein the digital home theater receiving terminal server is additionally provided with the evidence obtaining marking device.
Compared with the prior art, the beneficial effect of this application is:
according to the digital home theater digital video copyright management method and device, the invisible information embedding module is additionally arranged on the digital home theater receiving terminal server, the invisible information embedding module acquires a digital movie video, and invisible evidence obtaining mark information is embedded into the digital movie video, so that the movie video played by the digital home theater contains the invisible evidence obtaining mark information, when a user illegally spreads a movie (namely, piracy occurs) through recording, shooting, downloading and the like, a piracy source can be found according to the invisible evidence obtaining mark information, and a basis is provided for a digital movie copyright side providing services for the digital home theater to maintain self interests.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a flow chart of a forensic marking method provided herein;
FIG. 2 is a sub-flow diagram of a forensic marking method provided herein;
FIG. 3 is another flow chart of a forensic marking method provided herein;
FIG. 4 is a schematic diagram of one configuration of a forensic marking device provided herein;
FIG. 5 is a schematic diagram of one configuration of an embedded module provided herein;
fig. 6 is a schematic diagram of a digital home theater configuration provided by the present application;
fig. 7 is another schematic diagram of a digital home theater system provided by the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Before the forensic marking method provided by the present application is executed, an invisible information embedding module needs to be installed in the digital home theater receiving terminal server. The digital home theater receiving terminal server is a part of the digital home theater.
Example one
Referring to fig. 1, a flow chart of the forensic marking method provided in the present application is shown, which may include the following steps:
step S11: the invisible information embedding module acquires a digital movie video.
In this embodiment, the invisible information embedding module obtains a digital movie video to be played in the digital home theater to which the invisible information embedding module belongs.
In this embodiment, the digital movie video acquired by the invisible information embedding module may specifically be: compressing a digital cinema video with a format of H.264 and a resolution of any one of 4k, 2k, 1080P, 1080i and 720P;
or, the compression format is MPEG-2 and the resolution is any one of 4k, 2k, 1080P, 1080i and 720P.
Step S12: the invisible information embedding module embeds invisible evidence obtaining mark information into the digital movie video and provides evidence obtaining basis for judging pirate sources.
And after the invisible evidence obtaining mark information is embedded into the digital movie video, the digital movie video embedded with the invisible evidence obtaining mark information is obtained, and the digital movie video embedded with the invisible evidence obtaining mark information is output to the front end of the digital home theater to which the invisible information embedding module belongs for playing. When the digital film played at the front end is illegally broadcast by a user through recording, shooting, downloading and other modes, the pirate source can be found according to invisible evidence-taking mark information in the digital film.
The front end of the digital home theater is specifically a projector and a movie screen corresponding to the projector;
or, a television.
According to the digital home theater digital video copyright management method and device, the invisible information embedding module is additionally arranged on the digital home theater receiving terminal server, the invisible information embedding module acquires a digital movie video, and invisible evidence obtaining mark information is embedded into the digital movie video, so that the movie video played by the digital home theater contains the invisible evidence obtaining mark information, when a user illegally spreads a movie (namely, piracy occurs) through recording, shooting, downloading and the like, a piracy source can be found according to the invisible evidence obtaining mark information, and a basis is provided for a digital movie copyright side providing services for the digital home theater to maintain self interests.
Furthermore, the digital home theater belongs to civil equipment, has a large base number of users, is a domestic independent research and development product and independent intellectual property right, and therefore, the cost of integrating the invisible information embedding module in the digital home theater receiving terminal server of the digital home theater is low.
In this embodiment, the invisible information embedding module may specifically embed invisible forensic mark information into a digital cinema video with a compression format of h.264 and a resolution of any one of 4k, 2k, 1080P, 1080i, and 720P.
Of course, the invisible information embedding module can also embed invisible forensic mark information into digital cinema video with a compression format of MPEG-2 and a resolution of any one of 4k, 2k, 1080P, 1080i, 720P.
In this embodiment, the invisible information embedding module is an embedded integrated circuit board card in a physical form, the core computing unit is an FPGA processor, and the embedding of the invisible evidence obtaining mark information is completed by FPGA computing. The acquisition of the digital movie video is completed by a video input physical interface IP of the embedded integrated circuit board card. The digital movie video embedded with the invisible evidence obtaining marking information is output to the front end of the digital home theater to which the invisible information embedding module belongs through a video output physical interface HDMI.
The specific work flow of the embedded integrated circuit board card is as follows:
step A11: the digital movie video is acquired by a video input network physical interface and is transmitted to an FPGA (Field programmable gate array) processor.
Step A12: and the FPGA processor calculates the digital movie video and embeds invisible evidence obtaining mark information.
Specifically, the FPGA processor calculates a digital cinema video having a compression format of h.264 and a resolution of any one of 4k, 2k, 1080P, 1080i, and 720P.
Or, the FPGA processor calculates the digital movie video with the compression format of MPEG-2 and the resolution of any one of 4k, 2k, 1080P, 1080i and 720P.
Step A13: and outputting the information to the front end of the digital home theater to which the invisible information embedding module belongs by a video output HDMI (high definition multimedia interface).
Example two
In this embodiment, a specific process of embedding invisible forensic marking information into the digital cinema video by the invisible information embedding module is shown, please refer to fig. 2, which shows a sub-flowchart of a forensic marking method provided by the present application, and may include the following steps:
step S21: and the invisible information embedding module acquires copyright information and sound and picture metadata information of the digital movie video and converts the copyright information and the sound and picture metadata information into a digital watermark.
In this embodiment, the invisible information embedding module acquires copyright information and sound and picture metadata information of a digital cinema video, and converts the copyright information and the sound and picture metadata information into a digital watermark.
In this embodiment, the copyright information at least includes: the provider or operator number of the movie service, the subscriber information number and the playing time.
The sound-picture metadata information at least includes: film video format, film video resolution, film video code rate, film audio format, film audio code rate, film audio track information, reserved bits, and data check values.
The information capacity of the specific information included in the copyright information and the specific information included in the sound-picture metadata information can be referred to table 1.
TABLE 1
And converting the copyright information and the sound and picture metadata information into a digital watermark, wherein the digital watermark data form can be any one of a random sequence, a pseudo-random sequence, a character, a grid, a binary image, a gray level image, a color image and a 3D image.
Converting the copyright information and the sound-picture metadata information into a digital watermark can be specifically realized by a pseudo-random number generator; or by a chaos-based watermark generation method. The watermark generation method based on chaos has good confidentiality.
Step S22: and the invisible information embedding module decodes the digital movie video and embeds the digital watermark into the decoded digital movie video.
Because video data is large in volume, video is usually compression-encoded first in storage and transmission. And after the invisible information embedding module acquires the digital movie video, decoding the acquired digital movie video, and then embedding the digital watermark into the decoded digital movie video.
As can be seen from table 1, the capacity of the digital watermark embedded into the digital cinema video is 130 bits, and the watermark information capacity is high.
In this embodiment, the invisible information embedding module may decode a digital cinema video with a compression format of h.264 and a resolution of any one of 4k, 2k, 1080P, 1080i, and 720P.
Of course, the invisible information embedding module can also decode digital movie video with a compression format of MPEG-2 and a resolution of any one of 4k, 2k, 1080P, 1080i and 720P.
Of course, after embedding the digital watermark in the decoded digital cinema video, the decoded digital cinema video embedded with the digital watermark needs to be encoded before outputting the decoded digital cinema video embedded with the digital watermark. The invisible information embedding module decodes the digital movie video of which compression format and which resolution, namely, encodes the digital movie video with the corresponding compression format and resolution during decoding.
Specifically, the invisible information embedding module may encode the digital cinema video with a compression format of h.264 and a resolution of any one of 4k, 2k, 1080P, 1080i and 720P.
Of course, the invisible information embedding module can also encode digital cinema videos with any one of the compression formats of MPEG-2 and resolutions of 4k, 2k, 1080P, 1080i and 720P.
Before embedding the digital watermark in the decoded digital cinema video, the embedded digital watermark may be encrypted using a key to ensure that in extreme cases, if the watermark information is extracted, the digital watermark information is not exposed.
Specifically, the embedded digital watermark may be encrypted by using one key, or the digital watermark may be encrypted by using a combination of a plurality of keys, so as to implement multiple encryption.
In this embodiment, since the subscriber information number in the copyright information of the digital cinema video is unique for each home, when the digital cinema video is transmitted to a digital home theater, the invisible embedding module in the digital home theater receiving terminal server is also unique for the digital watermark embedded in the digital cinema video, and thus when piracy occurs, the digital watermark in the digital cinema video can be extracted, so that a piracy source can be accurately and quickly found.
Before embedding the digital watermark into the decoded digital cinema video, an embedding point may be selected in advance, and in this embodiment, specific content selected with respect to the embedding point is as follows:
and selecting I frames in the movie video compressed code stream for embedding the watermark. In a compressed code stream, an I frame is independent, each pixel of the I frame participates in coding, and the reconstruction of P frame and B frame images does not leave I frame data, so that the I frame can not be directly deleted in an H.264 code stream or an MPEG-2 code stream generally, and the I frame is more stable against frame deletion and frame jump attack; meanwhile, as the P frame and the B frame are predicted by the I frame, the watermark energy added in the I frame inevitably extends to the P frame and the B frame, so that certain robustness is provided for some attacks of replacing the original I frame data by reconstructed P frame (or B frame) data.
A DC component DC coefficient among I-frame image DCT (discrete cosine transform) coefficients is selected for embedding. Because the compressed code stream is separately coded by the brightness and the chroma for each macro block, and the human visual system is considered to be more sensitive to the brightness change and the chroma change, although the brightness coefficient and the chroma coefficient are more in quantity, the digital watermark is selectively added to the chroma DC coefficient so as to avoid great influence on the visual effect. After the watermark is embedded, the quality of the film picture and the quality of the audio frequency cannot influence normal listening and watching, and the information of the sound picture metadata cannot be changed.
In this embodiment, the invisible information embedding module may embed the digital watermark into the decoded digital cinema video according to the following steps:
step A21: reading a digital movie video compressed video stream bit by bit;
step A22: the embedding number flag is set to 0 when the I-frame header information is read.
Step A23: when the image format is I frame and the embedding times is less than 127, VLC decoding is carried out on the chroma block in the read macro block according to the intra macro block decoding method to obtain the chroma DC coefficient viAnd the chrominance AC coefficient AC[1-63]。
Step A24: calculate the sum of squares of chroma AC coefficients:
step A25: if Eac is greater than or equal to the threshold, digital watermark embedding is carried out once, and the embedding times are added by 1; if the embedding condition is not satisfied, the repetition determination of step a23 through step a25 is performed for the next chroma block.
The watermark embedding method comprises the following steps: v. ofi'＝vi+a·wi＝vi+ai.·bk·pi。
Wherein: v. ofi' denotes the chrominance DC coefficient after embedding the digital watermark; v. ofiIs a primary color degree DC coefficient; bkThe k-th digital watermark bit takes the value of-1 or 1; a isiTo embed numbersStrength of watermark, piAre the corresponding bits of the watermark sequence.
Step A26: and performing VLC coding on the chroma DC coefficient embedded with the digital watermark, replacing the original chroma DC coefficient VLC coding, and keeping the VLC coding of the AC component coefficient unchanged.
Step A27: and repeating the step A21 to the step A26 until the digital watermark is embedded.
And, based on the test, the above steps are performed for 130-bit data embedding every 10 seconds.
In this embodiment, compared with the digital watermark embedding that only contains copyright information in the prior art, the digital watermark embedded into the decoded digital movie video increases the sound-picture metadata information, so that the digital watermark capacity is large. In addition, in the present application, as can be seen from table 1, the capacity of each embedded digital watermark is 130 bits, and the watermark information capacity is high.
The digital watermarking embedding technology of the steps A21-A27 is adopted for videos played by a digital home theater, and because the digital home theater receiving terminal server provided by the application supports digital movie videos with a compression format of H.264 and any one of 4k, 2k, 1080P, 1080i and 720P and digital movie videos with a compression format of MPEG-2 and any one of 4k, 2k, 1080P, 1080i and 720P, digital watermarks can be embedded in videos with low resolutions such as 1080P, 1080i and 720P, so that digital watermarking information can be extracted from videos with low resolutions such as 1080P, 1080i and 720P, and compared with the digital watermarking embedding technology only for videos with 4k and 2k in the prior art, the watermark detection rate is improved.
Because the digital home theater receiving terminal server embeds the digital watermark into the digital movie video, evidence obtaining basis is provided for shooting and recording attack of a television screen of the digital home theater or shooting and recording attack of a movie screen of the digital home theater.
In the application, the digital watermark embedded into the decoded digital movie video is no longer only used as a basis for searching for a pirate source, but also can be used as a basis for knowing the basic information of the digital movie video to which the digital watermark belongs, so that a data information basis is provided for other applications. For example, according to the resolution of the film video in the digital watermark, distribution channels of digital film videos with different resolutions can be distinguished.
In this embodiment, another forensic marking method of the forensic marking method provided by the present application is further illustrated, please refer to fig. 3, and fig. 3 illustrates another flowchart of the forensic marking method provided by the present application, which may include the following steps:
step S31: and the invisible information embedding module acquires copyright information and sound and picture metadata information of the digital movie video and converts the copyright information and the sound and picture metadata information into a digital watermark.
Step S32: and the invisible information embedding module decodes the digital movie video and embeds the digital watermark into the decoded digital movie video.
Steps S31 and S32 are the same as steps S21 and S22 in the forensic marking method shown in fig. 2, and are not described again here.
Step S33: and the external detection equipment extracts the watermark from the digital movie video embedded with the digital watermark.
For the video embedded with the digital watermark, the process of extracting the watermark may specifically be:
when there is original carrier data I, useAnd (5) carrying out watermark detection by using the formula.
Or, when there is original watermark W, adoptFormula for water productionAnd (7) printing detection.
Or, in the absence of original information, byAnd (5) carrying out watermark detection by using the formula.
Wherein,representing an estimated watermark, D a watermark detection algorithm,representing the watermark carrier data after an attack during transmission. The means of detecting the watermark can be divided into two categories: firstly, under the condition of original information, extraction or correlation verification of an embedded signal can be carried out; secondly, under the condition of no original information, full search or distribution hypothesis test and the like must be carried out on the embedded information. If the signal is a random signal or a pseudo-random signal, the method for proving that the detected signal is a watermark signal is generally to perform a similarity test. The general formula of the watermark similarity test is as follows:
or
It is composed ofRepresenting the estimated watermark, W the original watermark, Sim the similarity of the different signals.
In the present application, for the digital watermark embedding process from step a21 to step a27, the present application provides a corresponding digital watermark detection process, specifically:
step A31: the watermarked compressed video stream is read bitwise.
Step A32: the count flag is set to 0 when the I-frame header information is read.
Step A33: when the image format is I frame and the time mark is less than 127, VLC decoding is carried out on the chroma block in the read macro block according to the intra macro block decoding method to obtain chroma DC coefficient v ″iAnd the chrominance AC coefficient AC[1-63]。
Step A34: calculate the sum of squares of chroma AC coefficients:
step A35: if Eac is greater than or equal to the set threshold, the count flag is incremented by 1 and s is calculatedi＝v″i·pi. If the condition is not satisfied, the repetition determination of step A33 through step A35 is performed for the next chroma block.
Wherein p isiBeing the corresponding bits, s, of the watermark sequenceiIs the extracted watermark.
Step A36: and repeating the steps A31 to A35 until the watermark information is extracted.
In the present application, steps S31 to S36 are performed to perform watermark detection, watermark information is repeatedly extracted, a plurality of extracted watermark sequences are added together bitwise, if the sum of a certain watermark bit is greater than 0, the watermark bit is finally 1, otherwise, the sum is-1, and based on statistics, repeated extraction can improve the accuracy of watermark extraction (i.e., detection). Based on the detection mechanism from step S31 to step S36, the watermark detection success rate can reach over 90%.
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present application is not limited by the order of acts or acts described, as some steps may occur in other orders or concurrently with other steps in accordance with the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
EXAMPLE III
The present application provides a forensic marking device, please refer to fig. 4, fig. 4 shows a schematic structural diagram of the forensic marking device provided in the present application, the forensic marking device includes: an acquisition module 41 and an embedding module 42.
The forensic marking device described in this embodiment is the invisible information embedding module in the above method embodiment. The evidence obtaining and marking device is specifically realized by an embedded integrated circuit board card.
And an obtaining module 41, configured to obtain the digital cinema video.
And the embedding module 42 is used for embedding invisible evidence obtaining mark information into the digital movie video and providing evidence obtaining basis for judging pirate sources.
Specific structure of the embedded module 42 referring to fig. 5, fig. 5 shows a schematic structural diagram of the embedded module provided in the present application, and the embedded module 42 includes: an acquisition unit 51, a conversion unit 52, a decoding unit 53, and an embedding unit 54.
An obtaining unit 51, configured to obtain copyright information and sound-picture metadata information of the digital cinema video.
The copyright information acquired by the acquisition unit 51 includes at least a provider or operator number of the movie service, a subscriber information number, and a play time.
The sound-picture metadata information acquired by the acquisition unit 51 includes at least: film video format, film video resolution, film video code rate, film audio format, film audio code rate, film audio track information, reserved bits, and data check values.
A conversion unit 52, configured to convert the copyright information and the sound-picture metadata information into a digital watermark.
A decoding unit 53, configured to decode the digital cinema video.
An embedding unit 54 for embedding the digital watermark into the decoded digital cinema video.
The present application further provides a digital home theater, please refer to fig. 6, which shows a schematic structural diagram of the digital home theater provided by the present application, and the digital home theater includes: a digital home theater receiving terminal server 61, a projector 62, and a movie screen 63.
The digital home theater receiving terminal server 61 is provided with the evidence obtaining and marking device.
The present application also provides another digital home theater, please refer to fig. 7, which shows another structural schematic diagram of the digital home theater provided by the present application, and the digital home theater includes: a digital home theater receiving terminal server 71 and a television 72.
The digital home theater receiving terminal server 71 is provided with the evidence obtaining and marking device.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functionality of the units may be implemented in one or more software and/or hardware when implementing the present application.
From the above description of the embodiments, it is clear to those skilled in the art that the present application can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.
The evidence-obtaining marking method, device and digital home theater provided by the present application are introduced in detail, and specific examples are applied in the present application to explain the principle and the implementation of the present application, and the description of the above embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A forensic marking method is characterized in that based on an invisible information embedding module added by a digital home theater receiving terminal server, the method comprises the following steps:
the invisible information embedding module acquires a digital movie video; and the number of the first and second groups,
invisible evidence obtaining mark information is embedded into the digital movie video, and evidence obtaining basis is provided for judging pirate sources.
2. The method of claim 1, wherein the embedding invisible mark-up information into the digital cinema video comprises:
acquiring copyright information and sound and picture metadata information of the digital movie video, and converting the copyright information and the sound and picture metadata information into digital watermarks;
and decoding the digital movie video, and embedding the digital watermark into the decoded digital movie video.
3. The method of claim 2, wherein the copyright information comprises at least: a provider or operator number of the movie service, a subscriber information number, and a play time;
the sound-picture metadata information at least includes: film video format, film video resolution, film video code rate, film audio format, film audio code rate, film audio track information, reserved bits, and data check values.
4. The method of claim 2, wherein embedding invisible forensic mark information into the digital cinema video comprises:
and embedding the digital watermark into the I frame in the digital movie video compressed code stream.
5. The method of claim 2, further comprising, after decoding the digital cinema video and embedding the digital watermark into the decoded digital cinema video:
and extracting the watermark of the digital movie video embedded with the digital watermark.
6. The method of any of claims 1-5, wherein the digital cinema video comprises: compressing a digital cinema video with a format of H.264 and a resolution of any one of 4k, 2k, 1080P, 1080i and 720P;
or, the compression format is MPEG-2 and the resolution is any one of 4k, 2k, 1080P, 1080i and 720P.
7. The utility model provides a mark device of collecting evidence which characterized in that installs additional in digital home theater receiving terminal server, mark device of collecting evidence includes:
the acquisition module is used for acquiring a digital movie video;
and the embedding module is used for embedding invisible evidence obtaining mark information into the digital movie video and providing evidence obtaining basis for judging pirate sources.
8. The forensic marking device according to claim 7 wherein the embedding module comprises:
the acquisition unit is used for acquiring copyright information and sound and picture metadata information of the digital movie video;
the conversion unit is used for converting the copyright information and the sound and picture metadata information into digital watermarks;
a decoding unit for decoding the digital cinema video;
and the embedding unit is used for embedding the digital watermark into the decoded digital movie video.
9. The digital home theater is characterized by comprising a digital home theater receiving terminal server, a projector and a movie screen, wherein the digital home theater receiving terminal server is additionally provided with the evidence obtaining marking device.
10. The digital home theater is characterized by comprising a digital home theater receiving terminal server and a television, wherein the digital home theater receiving terminal server is additionally provided with the evidence obtaining marking device.
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