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    • 26. 发明申请
    • VARIABLE LENGTH CODING FOR SPARSE COEFFICIENTS
    • 稀疏系数的可变长度编码
    • WO2007092661A3
    • 2007-12-21
    • PCT/US2007060693
    • 2007-01-18
    • CISCO TECH INCCHEN WEN-HSIUNGTOEBES JOHN A
    • CHEN WEN-HSIUNGTOEBES JOHN A
    • H03M7/40
    • H03M7/40H04N19/61H04N19/91H04N19/93
    • Coding quantized transform coefficients as occur in image compression includes, for a subset of coefficient amplitude values coding by a first method corresponding to each amplitude of the subset, events of a run of zero or more zero-valued coefficients ending in the single non-zero amplitude, coding by a second method events of a run of zero or more zero-valued coefficients ending in any single non-zero amplitude not in the subset, and coding by a third method the amplitude values of the concatenation of the non-zero amplitude not in the subset. The coding methods produce variable length codewords. The method is suitable for series that have scattered non-zero-valued coefficients.
    • 如在图像压缩中出现的那样编码量化的变换系数包括:对于通过对应于子集的每个幅度的第一方法编码的系数幅值的子集,终止于单个非零值的零个或更多个零值系数的游程的事件 振幅,通过第二方法进行编码,零个或多个零值系数的游程的事件结束于任何单个非零幅度,而不是在该子集中,以及通过第三方法编码非零幅度的级联的幅度值 不在子集中。 编码方法产生可变长度码字。 该方法适用于散射非零值系数的序列。