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    Robust digital watermarking
    31.
    发明公开
    Robust digital watermarking 审中-公开
    Robuste digitale Wasserzeichen

    公开(公告)号：EP2306725A2

    公开(公告)日：2011-04-06

    申请号：EP10182704.6

    申请日：1999-06-23

    申请人： Nec Corporation

    发明人： Cox, Ingemar J. ,  Miller, Matthew L. ,  Oami, Ryoma

    IPC分类号： H04N7/24 ,  H04N7/26 ,  H04N1/32 ,  G06T1/00

    CPC分类号： G06T1/0028 ,  G06T1/0064 ,  G06T2201/0052 ,  H04N1/32154 ,  H04N1/32165 ,  H04N1/32192 ,  H04N1/32277 ,  H04N1/32304 ,  H04N7/24 ,  H04N19/467 ,  H04N21/8358 ,  H04N2201/3233 ,  H04N2201/327

    摘要： A watermarking procedure that is applicable to images, audio, video and multimedia data to be watermarked divides the data to be watermarked into a set of n × n blocks, such as the 8x8 blocks of MPEG. The same watermark signal can be distributed throughout the set of blocks in a large variety of ways. This allows the insertion algorithm to be changed without affecting the decoders. The decoding procedure first sums together the DCT coefficients of N sets of 8x8 blocks to form a set of N summed 8x8 blocks and then extracts the watermark from the summed block. Since the sum of the DCT blocks is equal to the DCT of the sum of the intensity blocks, efficient decoding can occur in both the spatial and frequency domains.; The symmetric nature of the decoding process allows geometric distortions to be handled in the spatial domain and other signal distortions to be handled in the frequency domain. Moreover, insertion of a watermark signal into image data and the subsequent extraction of the watermark from watermarked image data which has been subject to distortion between the times of insertion and extraction involves the insertion of multiple watermarks designed to survive predefined distortions of the image data, such as panscan or letterbox mode transformations. Alternatively, a registration pattern in the image data, after the image data containing the registration pattern is subject to an unknown distortion, is used to compensate for distortion of the watermarked image data.

    摘要翻译： 适用于要加密水印的图像，音频，视频和多媒体数据的水印程序将要加密的数据划分成诸如MPEG的8×8块的n×n个块的集合。 相同的水印信号可以以各种方式分布在整个块集合中。 这允许插入算法被改变而不影响解码器。 解码过程首先将N个8×8块的DCT系数合在一起，以形成一组N个相加的8×8块，然后从求和块中提取水印。 由于DCT块的和等于强度块之和的DCT，因此可以在空间域和频域两者中进行有效的解码。 解码过程的对称性质允许在空间域中处理几何失真，并在频域中处理其他信号失真。 此外，水印信号插入到图像数据中，并且随后在插入和提取时间之间遭受失真的水印图像数据中提取水印涉及插入被设计成能够经受图像数据的预定失真的多个水印， 如平底锅或信箱模式转换。 或者，在包含登记图案的图像数据受到未知失真之后的图像数据中的登记模式用于补偿水印图像数据的失真。

    Method and apparatus for digital watermarking
    35.
    发明公开
    Method and apparatus for digital watermarking 审中-公开
    Verfahren undGerätzum digitalen Wasserzeichnen

    公开(公告)号：EP2066109A1

    公开(公告)日：2009-06-03

    申请号：EP09153542.7

    申请日：1999-09-01

    申请人： Nippon Telegraph and Telephone Corporation

    发明人： Ogawa, Hiroshi c/o Nippon Telegraph and Telephone Corporation ,  Nakamura, Takao c/o Nippon Telegraph and Telephone Corporation ,  Tomioka, Atsuki c/o Nippon Telegraph and Telephone Corporation ,  Takashima, Youichi c/o Nippon Telegraph and Telephone Corporation

    IPC分类号： H04N1/32

    CPC分类号： G06T1/0028 ,  G06T2201/0052 ,  G06T2201/0083 ,  H04N1/32154 ,  H04N19/467

    摘要： A method for embedding digital watermark data in digital data contents includes the steps of obtaining a frequency coefficient of block data of digital data contents, obtaining a complexity of the block data, obtaining an amount of transformation of the frequency coefficient from the complexity and the digital watermark data, and embedding the digital watermark data by transforming the frequency coefficient. In addition, a method for reading digital watermark data includes the steps of calculating a probability of reading '1' or '0' in a read bit sequence by using a test method on the basis of binary distribution, determining the presence or absence of digital watermark data according to the probability, and reconstituting digital watermark data. Another method includes the steps of performing soft decision in code theory by assigning weights to the digital watermark sequence with a weighting function, and reconstituting digital watermark data.

    摘要翻译： 一种用于将数字水印数据嵌入数字数据内容的方法包括以下步骤：获得数字数据内容的块数据的频率系数，获得块数据的复杂度，从复杂度获得频率系数的变换量和数字 水印数据，并通过变换频率系数嵌入数字水印数据。 此外，读取数字水印数据的方法包括以下步骤：通过使用基于二进制分布的测试方法来计算读取比特序列中的“1”或“0”的概率，确定是否存在数字 水印数据根据概率，并重构数字水印数据。 另一种方法包括以下步骤：通过对具有加权函数的数字水印序列分配权重，以及重构数字水印数据，在代码理论中进行软判决。

    Data processing apparatus and method
    37.
    发明公开
    Data processing apparatus and method 审中-公开
    数据处理装置和方法

    公开(公告)号：EP1394736A3

    公开(公告)日：2007-12-12

    申请号：EP03253663.3

    申请日：2003-06-10

    申请人： SONY UNITED KINGDOM LIMITED

    发明人： Tapson, Daniel Warren

    IPC分类号： G06T1/00

    CPC分类号： H04N1/32154 ,  G06T1/005 ,  G06T2201/0052 ,  G06T2201/0063 ,  G06T2201/0065 ,  G06T2201/0081 ,  H04N1/32165 ,  H04N1/3217 ,  H04N1/32277 ,  H04N2201/3235 ,  H04N2201/327

    摘要： A detecting data processing apparatus determines whether one or more code words of a predetermined set of code words are present in a suspected version of a material item. The apparatus comprises a registration processor operable to associate samples of the suspected version with samples of a copy of the original material item, a recovery processor and a detection processor. The recovery processor is operable to generate a recovered code word by comparing the registered copy of the original and the suspect material items. The detection processor is operable to detect one or more code words from a correlation between the recovered code word and the code words from the set. The registration processor is operable to form at least one reduced-bandwidth-version of the material item and to associate the suspected version and the copy of the material item in accordance with a comparison between the reduced-bandwidth-versions of the suspected version and the original material item.
    The registration of the suspected version and the original version of the material item is typically required in order to improve a likelihood of correctly recovering a code word from the suspected version. For material items such as video recordings of motion picture films, a substantial number of samples may need to be associated in order to effect the registration process. As a result, the registration process may be time consuming or at least computationally difficult. However, by forming reduced-bandwidth-versions of the suspected version and the original version of the material items, a corresponding reduction in the time taken to perform the registration process is provide in accordance with the bandwidth reduction.

    摘要翻译： 检测数据处理设备确定预定的一组码字中的一个或多个码字是否存在于材料项目的疑似版本中。 所述设备包括注册处理器，所述注册处理器可操作以将所述可疑版本的样本与所述原始资料项目的副本的样本，恢复处理器和检测处理器相关联。 恢复处理器可操作以通过比较原件的登记副本和可疑材料项目来生成恢复的代码字。 检测处理器可操作用于从恢复的码字和来自该组的码字之间的相关性中检测一个或多个码字。 注册处理器可操作用于形成至少一个减少带宽版本的材料项目并且根据可疑版本的减少带宽版本与该材料项目的副本之间的比较来将该可疑版本与该材料项目的副本相关联 原材料项目。 通常需要注册怀疑版本和素材项目的原始版本，以提高从怀疑版本正确恢复代码字的可能性。 对于诸如电影胶片的录像等重要物品，可能需要关联大量样本以实现注册过程。 结果，注册过程可能耗时或至少在计算上困难。 然而，通过形成怀疑版本的减少带宽版本和重要资料项的原始版本，相应地减少了执行注册过程所花费的时间，这是根据带宽减少来提供的。

    Data processing apparatus and method
    38.
    发明公开
    Data processing apparatus and method 审中-公开
    数据处理装置和方法

    公开(公告)号：EP1395060A3

    公开(公告)日：2007-08-08

    申请号：EP03253426.5

    申请日：2003-05-30

    申请人： SONY UNITED KINGDOM LIMITED

    发明人： Pelly, Jason Charles ,  Tapson, Daniel Warren

    IPC分类号： H04N7/24

    CPC分类号： H04N1/32154 ,  G06T1/005 ,  G06T2201/0052 ,  G06T2201/0063 ,  H04N1/32165 ,  H04N1/3217 ,  H04N1/32277 ,  H04N2201/324 ,  H04N2201/327

    摘要： A system for watermarking and distributing material includes a data processing apparatus, which operates as a watermark encoder. The data processing apparatus is operable to process an original material item to form a reduced-bandwidth-version of the material item, marked with a code word from a predetermined set of code words. The data processing apparatus is operable to form an impaired version of the material item from which a marked representation of the original material item can be formed. The impaired version is formed by subtracting the reduced-bandwidth-version of the material item from a copy of the original material item. As such, the impaired version can be mass distributed, but a representation of the original material item cannot be formed without the reduced-bandwidth-version of the material item. By watermarking the reduced-bandwidth-versions, a representation of the material item, formed by combining one of the marked reduced-bandwidth-versions with the impaired material item, can be uniquely identified. However, only a low bandwidth part of the material item need be watermark encoded, which is more easily distributable to individual recipients than watermarked copies of the original material item.