CN101399961B - Digital fingerprint embedding method, digital video distributing system and method - Google Patents
Digital fingerprint embedding method, digital video distributing system and method Download PDFInfo
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Abstract
The invention provides a digital fingerprint embedding method, digital video frequency distribution system and method. The digital fingerprint embedding method comprises following steps: determining area capable of embedding fingerprint according to visual model, extracting block data; according to visual model, generating modifiable range of every data of the block data as multiple fingerprint range by utilizing extracted block data; generating corresponding fingerprint sequence according to personal information of authorized user, then selecting number value sequence corresponding to the fingerprint sequence from multiple fingerprint range, the number sequence being key data corresponding to authorized user. The inventive video frequency distribution system solves problem of huge processing pressure and bandwidth occupation resulting from point-to-point distribution between video frequency server and user by reasonally designing generation mode, embedding method of digital fingerprint and distribution mode of video frequency.
Description
Technical field
The present invention relates to the digital video distribution, relate in particular to a kind of digital fingerprint embedding method, digital video distributing system and method.
Background technology
In the past ten years, digital video technology has been obtained the development of advancing by leaps and bounds.On the one hand, video coding technique development rapidly, compression efficiency is more and more higher, several video compression standards occurred thereupon, for example MPEG-2, MPEG-4 and H.264 wait; On the other hand, the development of broadband network and universal, also the application for digital video technology provides good premise and basis, a large amount of application relevant with digital video emerge, for example Web TV (IPTV:Intemet Protocol Television), HDTV (High-Definition Television) (HDTV:High Definition Television) etc., and had a large amount of users.Yet owing to obtain the convenience of digital video information, cause pirate activity also very rampant, badly influence the survival and development of whole digital multimedia industry.Have the video distribution system of efficient real-time digital fingerprinting method, become current research focus.
Digital finger-print is that if embedded digital finger-print in video, the version of each authorized user all can have fine distinction so according to certain sequence symbol of the personal information generation of authorized user, and this is because different users must obtain different fingerprints.When certain authorized user generation copy right piracy, we just can catch this malice bootlegger by the digital finger-print information in the video, thus the copyright of protection digital video.
The digital video distributing system that includes Digital Fingerprinting Technology at present mainly is divided into two kinds: based on the dissemination system of original video with based on the dissemination system of compressed video.
Be meant that based on the dissemination system of original video the embedding of digital finger-print directly carries out in original video.Its detailed process is when certain video of authorized user request, video server at first generates digital finger-print according to the personal information of authorized user, embedding grammar according to oneself embeds finger print information in original video then, the video that will embed then behind the fingerprint compresses processing, directly send this video file to authorized user by privately owned channel by server at last, idiographic flow as shown in Figure 1.
Embedding based on the digital finger-print of the dissemination system of original video is direct embedding finger print information in the original video of handling through compression algorithm, this method and video code model are irrelevant, and only relevant with video information itself, so the original video fingerprint can be adapted to various video compression standards in theory.Secondly, this method has directly been revised original video information, and general attack method is difficult to remove, so anti-attack ability is stronger.But, in fact most video compression standards are lossy compression method, the information difference of losing in the compression process may cause finger print information in various degree to be lost, so also must consider the difference of video compression standard during actual design original video watermark (finger print information).
Generally speaking, based on the dissemination system of original video, there is the problem of the following aspects:
(1) original video is than compression video big last tens times even hundreds of times, and the digital video storehouse of this system is quite huge, can occupy a large amount of storage resources;
(2) equally because original video is very big, digital video could must be distributed after overcompression, when adopting this method to embed finger print information so, need to embed earlier finger print information, again compression embeds video information behind the finger print information again, so calculation of complex, inefficiency;
(3) even different authorized users requires to watch same video content, because the difference of finger print information, video server also must send the video information that has minute differences by privately owned channel to each user.Even if userbase is about ten thousand people, when these users sent request simultaneously, it also was very big that video server deals with pressure, and is difficult to basically guarantee service quality with present bandwidth condition.
Based on the reason of above-mentioned three aspects, the data volume that this system need handle in video storage, fingerprint embedding, each link of video distribution is all very big, causes its efficient low unusually.This system is rendered in the practical application, even can't satisfy the Digital Television demand of a small city of China, so there is not too big practical value.
Be meant that based on the dissemination system of compressed video the embedding of digital finger-print directly carries out in compressed video.Its detailed process is when certain video of authorized user request, video server at first generates digital finger-print according to the personal information of authorized user, embedding grammar according to oneself directly embeds finger print information in compressed video then, directly sends this video file to authorized user by privately owned channel by server then.Idiographic flow as shown in Figure 2.
Directly embedding finger print information and video code model are in close relations in the video flowing after compression, are directed to different compressed video standards and need design different embedding grammars.At present the compressed video embedding grammar is mainly considered to combine with popular coding standard on the our times, as MPEG-2, MPEG-4, H.264 wait, technology such as the discrete cosine transform of considering simultaneously generally to adopt with these standards (DCT:Discrete CosineTransform), quantification, entropy coding, motion compensation, estimation combine, thereby derive different compressed video embedding grammars.
Compare with the dissemination system based on original video, this system improves aspect two: 1, direct store compressed video in the video library has solved digital video and has taken the too many problem of storage resources; 2, just can directly compressed video be distributed to the user behind the embedding fingerprint, do not need to pass through again the process of compressed encoding, reduced the amount of calculation of server significantly, improved efficient, so meet the requirement of industrial quarters more video playback, video distribution and monitoring.
Yet, based on the dissemination system of compressed video, still there is the problem of the following aspects:
(1) some is based on the dissemination system of compressed video, the information that can only under the specific format condition, take the fingerprint, and can't in original video, take the fingerprint, therefore can't resist conventional attack methods such as recompile;
(2) identical with dissemination system based on original video, video server also must send the video information that has minute differences by privately owned channel to each user, even if userbase is about ten thousand people, when these users send request simultaneously, it also is very big that video server deals with pressure, and is difficult to basically guarantee service quality with present bandwidth condition.
The problems referred to above (1) can be resolved by rational design embedding grammar, problem (2) then is that the ways of distribution by this system is determined, must just might solve the change that whole system is carried out on structure and the flow process, this also is to cause this system still can't large-scale promotion and the main cause of use.
Summary of the invention
In order to solve above-mentioned pointed problems of the prior art, the invention provides a kind of digital fingerprint embedding method, digital video distributing system and method.
According to one embodiment of the invention, a kind of digital fingerprint embedding method is provided, this method comprises the following steps: to determine can embed in the video data according to vision mode the zone of fingerprint, extracts little blocks of data; According to vision mode, utilize the little blocks of data extract, generate scope that each data in this little blocks of data can revise as a plurality of fingerprint regions; According to the personal information of authorized user, generate corresponding fingerprint sequence; From above-mentioned a plurality of fingerprint regions, select this fingerprint sequence value corresponding sequence.
According to another embodiment of the present invention, provide a kind of digital video distribution method, this method comprises the following steps: the fritter data in the video data are embedded digital finger-print, generates critical data, sends by encrypting channel; Chunk data except that little blocks of data in the video data is sent by public channel.
According to another embodiment of the present invention, a kind of digital video distributing system is provided, this system comprises the video separation unit, the fingerprint region generation unit that is coupled with the video separation unit, the fingerprint generation unit that is coupled with the fingerprint region generation unit, the video distribution unit that is coupled respectively with fingerprint generation unit and video separation unit, wherein: the video separation unit is used for determining that according to vision mode video data can embed the zone of fingerprint, extract little blocks of data, and the position of this little blocks of data in the former video data put 0 or random value, so that key data can't be watched; The fingerprint region generation unit is used for according to vision mode, utilizes the little blocks of data extract, generates scope that each data in this little blocks of data can revise as a plurality of fingerprint regions; The fingerprint generation unit is used for the personal information according to authorized user, generates corresponding fingerprint sequence, selects this fingerprint sequence value corresponding sequence then from above-mentioned a plurality of fingerprint regions, and this sequence of values is exactly the corresponding critical data of authorized user; The video distribution unit is used for described critical data is sent to authorized user by encrypting channel, and will issue by open channel except that the chunk data the described little blocks of data.
Digital video distributing system of the present invention has solved and has carried out processing pressure and the very large problem of occupied bandwidth that point-to-point distribution causes between video server and the user by reasonably designing the distribution mode of generating mode, embedding grammar and the video of digital finger-print.This system can distribute digital video content efficiently and easily by multiple channel; such as distributing digital video content by modes such as broadcasting, the Internet, DVD; also can combining encryption, digital watermarking multiple technologies such as (as digital fingerprints) catch the bootlegger; the legal copyright of protection digital video suppresses pirate movable effectively.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute limitation of the invention.In the accompanying drawings:
Fig. 1 is based on the schematic diagram of the dissemination system of original video in the prior art;
Fig. 2 is based on the schematic diagram of the dissemination system of compressed video in the prior art;
Fig. 3 is the structural representation of the digital video distributing system of one embodiment of the invention;
Fig. 4 is the digital video distribution method flow chart of one embodiment of the invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer,, the embodiment of the invention is described in further details below in conjunction with embodiment and accompanying drawing.At this, illustrative examples of the present invention and explanation thereof are used to explain the present invention, but not as a limitation of the invention.
Core content of the present invention is that the distribution with digital video is divided into two parts and carries out, first is the chunk data of digital video, this part has comprised main contents and most information of digital video, and with certain compressed format storage, but because this part does not comprise some crucial image information, the video image quality that uses normal decoder to see is very poor, can't watch; Second portion is the critical data part of digital video, comprised the key content in the digital video, but data volume is very little, and has embedded the finger print information of authorized user in these key contents, thereby the protection copyright information is inviolable.Have only these two partial data are synthesized together, just can watch normal video content.
Below in conjunction with the drawings and specific embodiments, digital fingerprint embedding method of the present invention, video distribution system and method are elaborated.
Please refer to Fig. 3, it is the structural representation of the digital video distributing system of one embodiment of the invention.The fingerprint region generation unit 33 that this system mainly comprises video separation unit 32, be coupled with video separation unit 32, the fingerprint generation unit 34 that is coupled with fingerprint region generation unit 33, the video distribution unit 35 that is coupled respectively with fingerprint generation unit 34 and video separation unit 32, wherein:
This video separation unit 32 need use vision mode to determine to embed the zone of fingerprint when the separating video data, and extracts fritter data D.For example selected direct current (DC:Direct Current) coefficient then extracts a plurality of DC coefficients that can embed fingerprint as embedding the zone.These positions that will extract data simultaneously put 0 or insert a value at random, thereby guarantee that key data can't watch.
Vision mode is to be used for judging which data is important critical data for vision, and these critical datas can exert an influence to vision, and in this area, the use of vision mode is very general, does not repeat them here.
Fingerprint region generation unit 33 also needs according to vision mode, and the fritter data D that utilizes said extracted to go out simultaneously finds each data D1, D2 among these fritter data D, scope that D3......Di can be modified as fingerprint region, as { D1
Min, D1
Max, { D2
Min, D2
Max, { D3
Min, D3
Max... { Di
Min, Di
Max.For example, if what extract is a plurality of DC coefficients, what then this fingerprint region generation unit 33 was responsible for generating each DC coefficient can change scope (DC
Min, DC
Max).The DC coefficient of choosing arbitrarily in this scope all can guarantee the quality of video.
Here need to prove that the data number of selected little blocks of data is greater than or equals the number of fingerprint sequence, so that each value that can corresponding fingerprint sequence, find out the respective value of each data in the little blocks of data.And in the number of selected little blocks of data during, then to the selection that should fingerprint sequence circulates greater than the number of fingerprint sequence.Still be example,,, then after the DC coefficient sequence of having selected one group of corresponding fingerprint sequence, continue according to fingerprint sequence from the 13rd DC coefficient scope { DC13 greater than the number 12 of fingerprint sequence if the number of DC coefficient is 18 with above-mentioned
Min, DC13
MaxIn begin to select, by that analogy.
In addition, if certain data can not be revised in the selected little blocks of data, the fingerprint region of then corresponding these data, DC
MinAnd DC
MaxAll directly adopt these data.
Thus, just finished the embedding work of digital finger-print.
The chunk data in the video distribution unit 35 responsible videos and the issue work of critical data.Chunk data does not have commercial value owing to can't watch, thus can be by openly channel distribution arbitrarily, and the user also can obtain these data simply and easily, for example by DVD, digital broadcasting, the Internet etc.; Critical data then needs by encrypting channel it directly to be sent to authorized user, and the method for encrypted transmission is varied, can be applied to the present invention, does not repeat them here.
The video server that the digital fingerprint embedding method and the digital video distributing system of the above embodiment of the present invention is applied to carry out video distribution, by this video distribution mode, reduce the data occupancy amount of privately owned channel, reduced the processing pressure of video server.
According to a specific embodiment of the present invention, digital video distributing system of the present invention can also comprise video encoding unit 31, in the present embodiment, this video encoding unit 31 mainly plays the effect of coding and preprocessed video data, it is used to use selected compressed video format that original video is encoded, need separate and embed finger print information to the video after the compression owing to follow-up, therefore when coding, can limit some parameters in the coded format earlier, for example, if use H.264 form to encode, then can limit the type of predictive mode, the piece number that comprises in the I frame etc.This embodiment is based on the embodiment of the dissemination system of compressed video.
Certainly; protection scope of the present invention is not limited to the embodiment of above-mentioned dissemination system based on compressed video shown in Figure 3; according to another specific embodiment of the present invention; described video encoding unit 31 is used for the critical data and the chunk data that generate are carried out compressed encoding, sends with open channel by encrypting channel separately again.This embodiment then is based on the embodiment of the dissemination system of original video.
For smooth displaying video, according to the various embodiments described above, digital video distributing system of the present invention can also comprise a video synthesis unit 36, it is used for authorized user by encrypting the critical data that channel obtains, and synthesize, thereby generate compressed video with digital finger-print by the chunk data that public channel obtains.
By this, authorizes user terminal is by normal decoding program smooth displaying video programs just.
In order to suppress pirate movable; according to the various embodiments described above; digital video distributing system of the present invention can also comprise a fingerprint extraction unit 37; it is responsible for pirate monitoring work; extract finger print information in the pirate video that it is collected from the market,, determine the bootlegger according to the finger print information uniqueness; thereby the copyright of protection digital video can suppress pirate movable effectively.
Please refer to Fig. 4 again, the digital video distributing system of the various embodiments described above according to the present invention, the present invention also provides a kind of digital video distribution method, and this method is corresponding with said system, mainly comprises the following steps:
Separating video data: determine to embed in the video data zone of fingerprint to extract little blocks of data according to vision mode, and the position of this little blocks of data in the former video data is put 0 or random value.Because the fritter data have been extracted from video data, therefore, remaining chunk data can't normally be watched.
Generate fingerprint region: according to vision mode, utilize the little blocks of data that extracts, generate scope that each data in this little blocks of data can revise as a plurality of fingerprint regions.Arbitrary value in each scope can guarantee the quality of this partial video, that is to say, the arbitrary value in each scope all can guarantee the integrality of former video data in this position.
Generate the critical data of fingerprint: according to the personal information of authorized user, generate corresponding fingerprint sequence, respectively select one then from above-mentioned a plurality of fingerprint regions, to select this fingerprint sequence value corresponding sequence, this sequence of values is exactly the corresponding critical data of authorized user;
Video distribution: described critical data is sent to authorized user by encrypting channel, and will passes through open channel, as distribution such as P2P, DVD, digital broadcasting, the Internets except that the chunk data the described little blocks of data.
Wherein, in a plurality of fingerprint regions, select the method for the sequence of values of corresponding fingerprint sequence to comprise the following steps:
At first according to the personal information of authorized user, generate corresponding 0, the 1} fingerprint sequence;
If the value in the fingerprint sequence is 0, then from a fingerprint region, select numerical value successively less than selected fingerprint region median;
If the value in the fingerprint sequence is 1, then from another fingerprint region, select numerical value successively greater than selected fingerprint region median;
By that analogy, select above-mentioned fingerprint sequence value corresponding sequence.
It is this that to select the method for the sequence of values of corresponding fingerprint sequence in a plurality of fingerprint regions be the embodiment that the present invention can implement; and protection scope of the present invention is not limited thereto, and any method according to the sequence of values in the corresponding fingerprint region of fingerprint sequence selection all is contained within protection scope of the present invention.
Above-mentioned method of video distribution has been arranged, and again by following video synthesis step, authorized user can pass through the smooth displaying video programs of normal decoding program.
This video synthesis step is: will synthesize from the chunk data of open channel acquisition and from the critical data of encrypting the channel acquisition, generation has the compressed video of digital finger-print, because as each numerical value of the sequence of values of critical data all is numerical value in fingerprint region, therefore can be used as little blocks of data is incorporated in chunk data, to guarantee video quality, thus, just normal decoding program broadcast program can have been passed through.
According to a preferred embodiment of the present invention, above-mentioned video coding, video separation, fingerprint region generate and fingerprint generates and can carry out at the video server end, and video is synthetic then can to carry out as the set-top box of authorized user at the authorized user end.
In addition, in order effectively to suppress pirate movable, method of the present invention can also realize by increasing following fingerprint extraction step.
This fingerprint extraction step is: extract finger print information in the pirate video of collecting from the market, according to the uniqueness of finger print information, determine to have the authorized user of this finger print information, bootlegger just, thereby the copyright of protection digital video.
With respect to other Digital Video System, digital video distributing system of the present invention and method have following advantage:
(1) the video most contents does not have commercial value, and anyone can obtain by any public channel, for example by popular P2P technology, has significantly simplified the workload of video distribution, has reduced the load of video server simultaneously.Solved effectively and carried out processing pressure and the very large problem of occupied bandwidth that point-to-point distribution causes between video server and the user.
(2) comprised whole digital finger-print information in the critical data, but data volume is very little, can realizes by man-to-man encrypted transmission between authorized user and the server fully.
(3) the fingerprint generation unit just can generate critical data by select suitable data from fingerprint region, has guaranteed efficient real-time embedding finger print information, thereby has satisfied the requirement of large-scale distribution and broadcast.
(4) for embodiment based on the dissemination system of compressed video, video coding is a pretreated process, in real system, at first all original videos are encoded according to certain rule, video after will encoding then leaves in the digital video storehouse of system, has guaranteed that the occupancy of video library is unlikely to too big.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (17)
1. a digital fingerprint embedding method is characterized in that, this method comprises the following steps:
Determine to embed in the video data zone of fingerprint to extract little blocks of data according to vision mode;
According to vision mode, utilize the little blocks of data extract, generate scope that each data in this little blocks of data can revise as a plurality of fingerprint regions;
According to the personal information of authorized user, generate corresponding fingerprint sequence;
From above-mentioned a plurality of fingerprint regions, select the critical data of this fingerprint sequence value corresponding sequence as the authorized user correspondence.
2. method according to claim 1 is characterized in that, describedly selects the step of the sequence of values of corresponding fingerprint region to comprise according to fingerprint sequence:
If the value in the fingerprint sequence is 0, then from a fingerprint region, select numerical value successively less than selected fingerprint region median;
If the value in the fingerprint sequence is 1, then from next fingerprint region, select numerical value successively greater than selected fingerprint region median;
By that analogy, select above-mentioned fingerprint sequence value corresponding sequence.
3. method according to claim 1 is characterized in that, also comprises the following steps: after the step of the little blocks of data of described extraction
The position of this little blocks of data in the former video data is put 0 or random value, so that key data can't be watched.
4. method according to claim 1 is characterized in that the number of described fingerprint region is more than or equal to the number of described fingerprint sequence.
5. a digital video distribution method is characterized in that, this method comprises the following steps:
Fritter data in the video data are embedded digital finger-print, generate critical data, send by encrypting channel;
Chunk data except that little blocks of data in the video data is sent by public channel;
Wherein, the step of embedding digital finger-print comprises:
Video separation step: determine to embed in the video data zone of fingerprint to extract little blocks of data according to vision mode;
Fingerprint region generates step: according to vision mode, utilize the little blocks of data that extracts, generate scope that each data in this little blocks of data can revise as a plurality of fingerprint regions;
Fingerprint generates step: according to the personal information of authorized user, generate corresponding fingerprint sequence, select this fingerprint sequence value corresponding sequence then from above-mentioned a plurality of fingerprint regions, this sequence of values is exactly the corresponding critical data of authorized user.
6. method according to claim 5 is characterized in that, describedly selects the step of the sequence of values of corresponding fingerprint region to comprise according to fingerprint sequence:
If the value in the fingerprint sequence is 0, then from a fingerprint region, select numerical value successively less than selected fingerprint region median;
If the value in the fingerprint sequence is 1, then from next fingerprint region, select numerical value successively greater than selected fingerprint region median;
By that analogy, select above-mentioned fingerprint sequence value corresponding sequence.
7. method according to claim 5 is characterized in that, also comprises following video coding step before the step of the little blocks of data of said extracted:
Use selected compressed video format that original video is encoded, and when coding, some parameters in the coded format are limited, so that follow-up video after the compression is separated and embeds finger print information.
8. method according to claim 5 is characterized in that, also comprises the following steps: after the step of the little blocks of data of described extraction
The position of this little blocks of data in the former video data is put 0 or random value, so that key data can't be watched.
9. method according to claim 7 is characterized in that, this method also comprises following video synthesis step:
Authorized user by encrypting the critical data that channel obtains, and is synthesized by the chunk data that public channel obtains, have the compressed video of digital finger-print with generation.
10. method according to claim 9 is characterized in that this method also comprises the following steps:
From described compressed video, extract finger print information,, determine authorized user, with the copyright of protection digital video according to the finger print information uniqueness.
11. method according to claim 9 is characterized in that, described video coding, video separation, fingerprint region generate and the step of fingerprint generation is to carry out at the video server end; The synthetic step of described video is carried out at the authorized user end.
12. digital video distributing system, it is characterized in that, the fingerprint region generation unit that this system comprises the video separation unit, be coupled with the video separation unit, the fingerprint generation unit that is coupled with the fingerprint region generation unit, the video distribution unit that is coupled respectively with fingerprint generation unit and video separation unit, wherein:
The video separation unit is used for determining that according to vision mode video data can embed the zone of fingerprint, extracts little blocks of data, and the position of this little blocks of data in the former video data is put 0 or random value, so that key data can't be watched;
The fingerprint region generation unit is used for according to vision mode, utilizes the little blocks of data extract, generates scope that each data in this little blocks of data can revise as a plurality of fingerprint regions;
The fingerprint generation unit is used for the personal information according to authorized user, generates corresponding fingerprint sequence, selects this fingerprint sequence value corresponding sequence then from above-mentioned a plurality of fingerprint regions, and this sequence of values is exactly the corresponding critical data of authorized user;
The video distribution unit is used for described critical data is sent to authorized user by encrypting channel, and will issue by open channel except that the chunk data the described little blocks of data.
13. system according to claim 12, it is characterized in that, this system also comprises video encoding unit, be coupled with described video separation unit, be used to use selected compressed video format that original video is encoded, and some parameters in the coded format are limited, so that follow-up video after the compression is separated and embeds finger print information in when coding.
14. system according to claim 13, it is characterized in that this system also comprises the video synthesis unit, be used for authorized user by encrypting the critical data that channel obtains, and synthesize by the chunk data that public channel obtains, have the compressed video of digital finger-print with generation.
15. system according to claim 14 is characterized in that, this system also comprises the fingerprint extraction unit; the pirate compressed video that is used for collecting from the market extracts finger print information; according to the finger print information uniqueness, determine the bootlegger, with the copyright of protection digital video.
16. system according to claim 14 is characterized in that, described video encoding unit, video separation unit, fingerprint region generation unit and fingerprint generation unit are contained in video server; Described video synthesis unit is contained in the authorized user end.
17. system according to claim 16 is characterized in that, described authorized user end is the authorized user set-top box.
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| CN101980542B (en) * | 2010-11-16 | 2012-08-22 | 上海交通大学 | Video digital fingerprints embedding based on timing sequence vibration and error correcting code and testing method thereof |
| CN106851332B (en) * | 2017-01-04 | 2019-09-20 | 北京百度网讯科技有限公司 | Video stream processing method, device and system |
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| CN1806442A (en) * | 2003-06-25 | 2006-07-19 | 汤姆森许可贸易公司 | Encoding method and apparatus for insertion of watermarks in a compressed video bitstream |
| CN1812541A (en) * | 2005-12-27 | 2006-08-02 | 浪潮电子信息产业股份有限公司 | Digital copyright and digital watermark protecting method for video program |
| CN101399962A (en) * | 2007-09-28 | 2009-04-01 | 北京视博数字电视科技有限公司 | Digital fingerprint embedding method, digital video distributing system and method |
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| CN1806442A (en) * | 2003-06-25 | 2006-07-19 | 汤姆森许可贸易公司 | Encoding method and apparatus for insertion of watermarks in a compressed video bitstream |
| CN1595428A (en) * | 2004-07-15 | 2005-03-16 | 清华大学 | Fingerprint identification method based on density chart model |
| CN1812541A (en) * | 2005-12-27 | 2006-08-02 | 浪潮电子信息产业股份有限公司 | Digital copyright and digital watermark protecting method for video program |
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