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    • 8. 发明授权
    • Modifying a coded bitstream
    • 修改编码比特流
    • US08358703B2
    • 2013-01-22
    • US12450200
    • 2007-11-02
    • Dekun ZouJeffrey Adam BloomPeng YinOscar Divorra Escoda
    • Dekun ZouJeffrey Adam BloomPeng YinOscar Divorra Escoda
    • H04N7/12H04N11/02H04N11/04
    • G06T1/0035G06T2201/0053H04N19/13H04N19/467H04N19/48H04N19/70
    • Implementations may relate to various aspects of modifying, or using, a coded bitstream, or to recovering watermarking information from data. In one implementation, a coded bitstream is modified to allow for the application of a watermark to the coded bitstream without changing the coding of any other syntax elements in the bitstream. This is performed by identifying conditions necessary to change a coded syntax element without disrupting the interpretation of subsequent coded elements. The coded syntax element is replaced with another coded value if the modified value generates the same decoding variables as the original value would have generated. Particular implementations focus on syntax elements coded using entropy coding, including, for example, Context-based Adaptive Binary Arithmetic Coding (CABAC). Regardless of the type of coding or watermarking, various implementations may provide for recovering watermarking information. Particular implementations recover watermarking information using detection data and feature information.
    • 实现可以涉及修改或使用编码比特流的各个方面,或者从数据恢复水印信息。 在一个实现中,编码比特流被修改为允许将水印应用于编码比特流,而不改变比特流中任何其他语法元素的编码。 这是通过识别改变编码语法元素所必需的条件而不中断后续编码元素的解释来执行的。 如果修改后的值产生与原始值相同的解码变量,则将编码语法元素替换为其他编码值。 特定实现集中于使用熵编码编码的语法元素,包括例如基于上下文的自适应二进制算术编码(CABAC)。 不管编码或水印的类型如何,各种实现可以提供恢复水印信息。 具体实现使用检测数据和特征信息恢复水印信息。