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1. 发明申请

WO2006061601A9 BLOCK-BASED WATERMARKING 审中-公开
标题翻译：基于块的水印
公开(公告)号：WO2006061601A9
公开(公告)日：2009-07-30
申请号：PCT/GB2005004682
申请日：2005-12-07
申请人： SONY UK LTD , TAPSON DANIEL WARREN , HOOPER DANIEL LUKE
发明人： TAPSON DANIEL WARREN , HOOPER DANIEL LUKE
IPC分类号： G06T1/00
CPC分类号： H04N21/23892 , G06T1/005 , G06T2201/0051 , G06T2201/0061 , G06T2201/0065 , G06T2201/0083
摘要： A water marked image frame for conveying a payload data word is generated by combining at least one image frame with a two-dimensional water mark pattern. Comprising a plurality of regions, each including a two dimensional water mark block selected from a predetermined set of possible water mark blocks to represent the value of the associated payload data symbol. The payload data is detected by correlating each region of the water marked image frame with each block from of the set of water marked blocks, to form for each region a set of probability surfaces, each of which is combined with a distortion probability value for each region and for each of the water mark blocks which may be present in the region thus forming for each region, for each of the possible values of the payload symbol a probability value that that region includes that symbol value and therefrom generating an estimate of the payload data.
摘要翻译：通过将至少一个图像帧与二维水印图案组合来产生用于传送有效载荷数据字的水印图像帧。包括多个区域，每个区域包括从预定的一组可能的水印块中选择的二维水印块，以表示相关联的有效载荷数据符号的值。通过将水印图像帧的每个区域与该组标记水印块的每个块相关联来检测有效载荷数据，以便为每个区域形成一组概率表面，每个区域与每个区域的失真概率值对于可能存在于区域中的每个水印块的每个水印块，对于每个区域，对于有效载荷符号的每个可能的值，该区域包括该符号值并从而生成有效载荷的估计的概率值数据。

2. 发明专利

GB2443227A Using watermarks to detect unauthorised copies of content materials 未知
公开(公告)号：GB2443227A
公开(公告)日：2008-04-30
申请号：GB0621063
申请日：2006-10-23
申请人： SONY UK LTD
发明人： GILLARD CLIVE HENRY , HOOPER DANIEL LUKE
IPC分类号： H04N7/24 , G06T1/00 , H04N5/913
摘要： A system for recovering an estimate of a finger print code word from an unauthorised copy of content material includes a secure content production device and a proxy generator. The secure content production device is operable to convert the content material into a content data file for distribution to a reproduction apparatus, the content data file including frames of the content material which are to be reproduced by a reproduction apparatus and to encrypt the content data file using a content encryption key to form a secure content data file for secure distribution to the reproduction apparatus. The proxy generator is operable to generate a proxy version of the content material representing a reduced quality version of the content material, the quality being reduced to discourage unauthorised copying of the content material and including the frames of the content material which are to be reproduced by the reproduction apparatus. The reproduction apparatus is operable to decrypt the secure content file to recover the content material, to introduce one or more finger print code words into the frames of the content to form a marked version of the content, and to reproduce the marked content. A detection device is operable to receive the carrying medium and to receive a suspected unauthorised copy of the marked content reproduced by the reproduction apparatus, and to reproduce the proxy version of the content from the carrying medium. The detection device is operable to recover an estimate of the one or more finger print code words by comparing the frames of the proxy version with the frames of the suspect version.

3. 发明专利

GB2438907A Application of watermark data to video frames 未知
公开(公告)号：GB2438907A
公开(公告)日：2007-12-12
申请号：GB0621093
申请日：2006-10-23
申请人： SONY UK LTD
发明人： KEATING STEPHEN MARK , RUSSELL MARK JULIAN , GILLARD CLIVE HENRY , HOOPER DANIEL LUKE , MCLEAN IAN , TAPSON DANIEL WARREN
IPC分类号： G06T1/00 , H04N1/32
摘要： An encoding data processing apparatus generates a marked copy of a video material item by embedding a payload data word 1 into the video material item. The video material item includes a plurality of video frames. The encoding data processing apparatus comprises a code word generator 10, a shuffle processor 19 and an embedding data processor. The code word generator is operable to generate a water mark code word from the payload data word and to read data representing the water mark code word into a shuffle data store 18. The shuffle processor is operable to generate pseudo randomly at least one address within an address space of the shuffle data store for each of the video frames and to read data representing part or parts of the water mark code word out from the data store at locations identified by the pseudo randomly generated address. The data embedding processor is operable to receive the video material item and to embed the data representing the part or parts of the water mark code word read out from the shuffle data store for each frame into a corresponding frame of the-video material item. As such, by randomly embedding different parts of the code word into each frame of the video material item, a likelihood of an attacker being able to identify the code word within the video material item is substantially reduced. Security of the payload data word represented by the water mark code word is therefore improved.

4. 发明专利

GB2421133A Registering a water marked image by calculating distortion vector estimates 未知
公开(公告)号：GB2421133A
公开(公告)日：2006-06-14
申请号：GB0427026
申请日：2004-12-09
申请人： SONY UK LTD
发明人： TAPSON DANIEL WARREN , HOOPER DANIEL LUKE
IPC分类号： G06T1/00 , G06T7/00 , H04N1/32
摘要： A data processing apparatus registers an image which has been encoded with a two-dimensional water mark pattern. The water mark comprises for each frame of the image a water mark frame pattern of water mark blocks, the water mark pattern comprising a plurality of regions. Each region of the pattern includes one water mark block selected from a predetermined set of possible water mark blocks in accordance with a key sequence. The key sequence provides a predetermined sequence of selected water mark blocks to form the water mark pattern of each frame to provide a predetermined sequence of water marked frames. The data processing apparatus comprises a block match processor operable to generate block match probabilities comprising for each region of a current frame of the water marked image a probability surface of possible distortion vectors for each possible water mark block of the set of possible water marked blocks which may have been added to that region of the image frame, a water mark block prior probability calculator operable to form block prior probabilities, a distortion probability calculator operable to form a spatial prior probability surface for each region of the current image frame from the block prior probabilities and the block match probabilities, providing a probability distribution of distortion vectors for the region, and a markov distortion processor operable to form an estimate of a distortion vector for each region from the adapted spatial prior probabilities. Accordingly, distortion in a water marked image can be detected and then removed with out a need to refer to an original copy of the image.

5. 发明专利

GB2404487A Access control for digital storage medium content 未知
公开(公告)号：GB2404487A
公开(公告)日：2005-02-02
申请号：GB0317964
申请日：2003-07-31
申请人： SONY UK LTD
发明人： PELLY JASON CHARLES , TAYLOR ANDREW ROBERT , TAPSON DANIEL WARRAN , HOOPER DANIEL LUKE , ALVES-MOREIRA EMMANUEL
IPC分类号： G06F21/10 , G11B20/00 , H04L9/08 , G11B23/28 , H04N5/913
摘要： Incorporating the media identifier into the encryption of access data prevents decryption of content data from an unauthorised copy of a medium and thus controls access to that data. Digital data stored on a medium 140 is encrypted 920 using keys of an access bundle 910 which are then encrypted 930 with a session key Ka and stored on the medium 140 to form access data, DATA 1. Session key Ka is combined with a read-only medium identifier DISC ID and encrypted using public keys Kw1 - Kwn and recorded on the medium as DATA 2. Medium 140 maybe an optical disc such as a DVD. Encryption may be symmetric or asymmetric, use a private key and public key pair and incorporate a second encryption scheme such as water marking. Encryption and decryption keys may be held on a removable memory device such as a smart card, and which may itself have a data processing ability to perform encryption.

6. 发明专利

DE602005007560D1 未知
公开(公告)号：DE602005007560D1
公开(公告)日：2008-07-31
申请号：DE602005007560
申请日：2005-11-01
申请人： SONY UK LTD
发明人： TAPSON DANIEL WARREN , HOOPER DANIEL LUKE
IPC分类号： G06T1/00
摘要： A watermarked image comprises a plurality of samples with added watermark codeword coefficient values. The image is low pass filtered to generate, for each sample, a local mean which is subtracted from the image to generate a residual signal, from which a local standard deviation for each sample is determined. For each sample, a watermark strength value provides an estimate of the magnitude of embedding, a first and second gaussian likelihood function describe the likelihoods of the embedded watermark codeword coefficient being positive and negative, the first and second gaussian likelihood function having the sum and difference of the local mean and the watermark strength value as means, respectively, and the local standard deviation as a standard deviation. The watermark can be detected in the image based on the above first and second likelihoods. This provides an estimate of the positioning of the watermark within the image.

7. 发明专利

GB2421136A Detection of code word coefficients in a watermarked image 未知
公开(公告)号：GB2421136A
公开(公告)日：2006-06-14
申请号：GB0427033
申请日：2004-12-09
申请人： SONY UK LTD
发明人： TAPSON DANIEL WARREN , HOOPER DANIEL LUKE
IPC分类号： G06T1/00 , H04N1/32
摘要： A data processing method for detecting a watermark codeword in a received image signal representing a watermarked image is described. The watermarked image comprises a plurality of signal samples each of which represents a pixel value of the image, to which a watermark codeword coefficient value has been added. The method comprises the steps of low pass filtering the received image signal to generate, for each signal sample, a local mean value, subtracting the local mean from the received image signal to generate a residual signal comprising, for each signal sample, a residual value, and determining, from the residual signal, a local standard deviation for each signal sample. The method also comprises the step of generating, for each signal sample, a watermark strength value providing an estimate of the magnitude with which the watermark codeword coefficient has been added to the received image signal sample. The method also comprises the steps of generating, for each signal sample, a first gaussian likelihood function describing the likelihood of the watermark codeword coefficient embedded into the signal sample being positive, the first gaussian likelihood function having a mean defined by the sum of the local mean value and the watermark strength value and a standard deviation defined by the local standard deviation and generating, for each signal sample, a second gaussian likelihood function describing the likelihood of the watermark codeword coefficient embedded into the signal sample being negative, the second gaussian likelihood function having a mean defined by the difference between the local mean value and the watermark strength value and a standard deviation defined by the local standard deviation. The method can detect a watermark in the received watermark image based on the probability of the watermark codeword coefficients added to each signal sample being one of positive or negative, the probability being calculated from the first and second likelihood functions.

8. 发明专利

GB2438904A Generation of code words for image watermarking 未知
公开(公告)号：GB2438904A
公开(公告)日：2007-12-12
申请号：GB0611127
申请日：2006-06-06
申请人： SONY UK LTD
发明人： KEATING STEPHEN MARK , MCLEAN IAN , RUSSELL MARK JULIAN , HOOPER DANIEL LUKE , TAPSON DANIEL WARREN
IPC分类号： G06T1/00
摘要： An encoding data processing apparatus generates a marked copy of a video material item by representing a payload data word 1 as a code word and embedding the code word into a copy of the video material item. The apparatus comprises a code word generator 10 including a pre-processor 8 and an encryption processor 14. The pre-processor is operable to divide the payload word into a plurality of parts, to form a plurality of initial values from the plurality of parts, each of the initial values being formed by adding parts of the payload data word to each initial value successively starting with the first part added to the first initial value, and adding the first and second to the second initial value so that each subsequent initial value includes all the parts of the payload data word of those of the previous initial values in addition to a new part of the payload data word. The encryption processor is operable to receive each of the initial values and to generate an encrypted data stream from each of the initial values using a payload encryption key. A combiner 22 is operable to combine the encrypted payload data word with the video material item. The encrypted data streams are thereby provided with improved orthogonality, which can assist in the detection of each of the encrypted data streams by correlation. Furthermore, the likelihood of an attacker being able to discover, alter or destroy the payload data word in the material item is reduced.

9. 发明专利

GB2404489A Access control for digital storage medium content 未知
公开(公告)号：GB2404489A
公开(公告)日：2005-02-02
申请号：GB0317967
申请日：2003-07-31
申请人： SONY UK LTD
发明人： PELLY JASON CHARLES , TAYLOR ANDREW ROBERT , TAPSON DANIEL WARREN , HOOPER DANIEL LUKE , ALVES-MOREIRA EMMANUEL
IPC分类号： G06F21/10 , G09C1/00 , G11B20/00 , H04L9/08 , G11B23/28 , H04N5/913
摘要： Encrypted data is recorded on a medium 140, such as an optical disc using a public key Kw stored on an access control memory device (fig 5, 130) and the encrypted data may be decrypted and reproduced using either a default key (fig 14, Ks) or a private key (fig 14, Ksi) which is stored on a further access control memory device (fig 6, 130) and which is associated with the public key Kw. The access control memory device 130 may comprise a smart card and may itself have data processing means to perform encryption. A public/private key pair may be allocated to different user groups and the access control memory device may be removable and connect via a secure interface. Encryption may be symmetric or asymmetric, and in the case of video data may incorporate a second encryption scheme such as visible water marking.

10. 发明专利

GB2438903A Generation of code words for image watermarking 未知
公开(公告)号：GB2438903A
公开(公告)日：2007-12-12
申请号：GB0611124
申请日：2006-06-06
申请人： SONY UK LTD
发明人： RUSSELL MARK JULIAN , HOOPER DANIEL LUKE
IPC分类号： G06T1/00
摘要： An encoding data processing apparatus generates a marked copy W of a video material item by representing a payload data word as a code word and embedding the code word into a copy of the video material item. The apparatus comprises a code word generator 10 including a pre-processor 8 and an encryption processor 14. The pre-processor is operable to form a plurality of initial values, each having the same predetermined length, by representing one or more parts of the payload data word in one or more of the initial values, including a field index in each initial value and setting the remaining parts of the initial value to a predetermined value. The encryption processor is operable to receive each of the initial values and to generate an encrypted data stream from each of the initial values using a payload encryption key to provide a plurality of encrypted data streams 18. The combiner 22 is operable to combine the parts of the encrypted data streams with the frames of the material item. A plurality of the initial values are arranged to include the same part of the payload data, and the value of the field index for the initial value including the same payload data is changed with respect to the other initial values. For each of the one or more initial values which represents the same payload data, the field index is arranged to have a different value. These initial values are formed from the same payload data and have the same format, with the remaining set to a predetermined value such as zero. In order to avoid the encrypted streams, which convey the same payload data producing the same encrypted data stream which is added to the material items, the field index is changed to identify each of the initial values. Thus, each of the resulting encrypted streams produced by the initial values will produce different encrypted data streams, which can thereby be more easily detected individually by correlation, even though each initial value otherwise conveys the same payload.

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