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    Apparatus and method for decoding variable-length code
    8.
    发明公开
    Apparatus and method for decoding variable-length code 失效
    装置和用于解码可变长度码的方法。

    公开(公告)号：EP0665653A3

    公开(公告)日：1997-04-02

    申请号：EP95100985.1

    申请日：1995-01-25

    申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

    发明人： Takeno, Hiroshi ,  Miyagoshi, Eiji ,  Imanishi, Hiroshi ,  Nakatani, Shintarou ,  Akiyama, Toshihide

    IPC分类号： H03M7/42

    CPC分类号： H03M7/425

    摘要： 5 n7 A variable-length-code decoder of this invention decodes an input bit stream including an input bit string having a codeword of a fixed-length code and a plurality of codewords of variable-length codes combined in a predetermined format. The decoder includes: a shifter for shifting the input bit string by a desired number of bits; a pattern detector for detecting a specific pattern in the bit string, and outputting a detection signal; two code tables provided for the respective variable-length codes, each code table having the length of each codeword (codeword length) and the decoded-word corresponding to the codeword, and outputting a codeword length and a decoded-word of a corresponding codeword based on the bit string output from the shifter; a processor for storing the format of the input bit string, outputting the length of the fixed-length code and decoded data of the fixed-length code, and selecting, for each of the variable-length codewords, one of the code tables to which the variable-length codeword belongs to, based on the detection signal and the format; a codelength selector for selecting the codeword length or the fixed-length code, and for setting the shift amount for the input bit string in the shifter; and an output circuit for selectively outputting the decoded-word or the decoded data.

    Apparatus for motion compensation coding of digital video signal
    10.
    发明公开
    Apparatus for motion compensation coding of digital video signal 失效
    Vorrichtung zur Kodierung von digitalen Bildsignalen mit Bewegungskompensation。

    公开(公告)号：EP0577418A2

    公开(公告)日：1994-01-05

    申请号：EP93305146.8

    申请日：1993-06-30

    申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

    发明人： Seng, Boon Choong ,  Akiyama, Toshihide ,  Takahashi, Kenichi

    IPC分类号： H04N7/137

    CPC分类号： H04N19/577 ,  H04N19/107 ,  H04N19/503 ,  H04N19/61

    摘要： For mode selection in motion compensated coding of digital video signals, reference is mode to the original pictures instead of decompressed pictures. Minimum errors produced during motion estimation, corresponding to optimum motion vectors, are used for mode selection. A motion detector detects a optimum motion vector of a current block, for each possible reference picture in the past and future, and outputs the optimum motion vectors and corresponding minimum errors. In a mode selector, an activity of the current block is estimated, an interpolated prediction obtained by averaging predictions from the past and future is evaluated, and an optimum mode is determined which gives a smallest value among all the minimum errors, the activity of the current block and the evaluation of the interpolated prediction.

    摘要翻译： 对于数字视频信号的运动补偿编码中的模式选择，参考是原始图像的模式，而不是解压缩的图像。 对应于最佳运动矢量的运动估计过程中产生的最小误差用于模式选择。 运动检测器针对过去和将来的每个可能的参考图像检测当前块的最佳运动矢量，并且输出最佳运动矢量和对应的最小误差。 在模式选择器中，估计当前块的活动，通过对来自过去和未来的预测进行平均而获得的内插预测进行评估，并且确定在所有最小误差中给出最小值的最佳模式， 当前块和内插预测的评估。