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    Coding compression method and coding compression apparatus
    1.
    发明授权
    Coding compression method and coding compression apparatus 有权
    编码压缩方法和编码压缩装置

    公开(公告)号：US06343153B1

    公开(公告)日：2002-01-29

    申请号：US09283983

    申请日：1999-04-02

    申请人： Kojiro Kawasaki ,  Takumi Hasebe ,  Kazuhiko Nakamura ,  Yoshiichiro Kashiwagi

    发明人： Kojiro Kawasaki ,  Takumi Hasebe ,  Kazuhiko Nakamura ,  Yoshiichiro Kashiwagi

    IPC分类号： G06K936

    CPC分类号： H04N19/179 ,  H04N19/124 ,  H04N19/14 ,  H04N19/15 ,  H04N19/152 ,  H04N19/154 ,  H04N19/177 ,  H04N19/46 ,  H04N19/61

    摘要： A coding compression method for encoding the video image signal with a variable bit rate includes performing coding to the video image signal for each predetermined coding unit in accordance with a predetermined first coding parameter, which coding is completed within the coding unit, thereby generating a first coded stream, calculating a second coding parameter of the video image signal for each the predetermined coding unit while generating the first coded stream, indicating a partial section of the first coded stream, the partial section comprising the predetermined coding units, editing the second coding parameters corresponding to the designated subsections, performing coding to the video image signal of the designated subsections in accordance with the edited second coding parameters thereby to produce a second coded stream, and replacing a partial section of the first coded stream with at least a partial section of the second coded stream, the partial section of the second coded stream corresponding to the partial section of the first coded stream.

    摘要翻译： 用于以可变比特率对视频信号进行编码的编码压缩方法包括根据预定的第一编码参数对每个预定编码单元对视频信号进行编码，该编码在编码单元内完成，从而产生第一 编码流，计算每个预定编码单元的视频信号的第二编码参数，同时产生指示第一编码流的部分部分的第一编码流，包括预定编码单元的部分部分，编辑第二编码参数 对应于所指定的子部分，根据编辑的第二编码参数对指定子部分的视频图像信号执行编码，从而产生第二编码流，并且用至少部分部分部分替换第一编码流的部分部分 第二编码流，第二编码流的部分部分 流对应于第一编码流的部分部分。

    Variable-bit-rate coding apparatus
    3.
    发明授权
    Variable-bit-rate coding apparatus 有权
    可变比特率编码装置

    公开(公告)号：US06510176B1

    公开(公告)日：2003-01-21

    申请号：US09404257

    申请日：1999-09-22

    申请人： Hideki Fukuda ,  Kazuhiko Nakamura ,  Kojiro Kawasaki

    发明人： Hideki Fukuda ,  Kazuhiko Nakamura ,  Kojiro Kawasaki

    IPC分类号： H04N712

    CPC分类号： H04N19/115 ,  H04N19/15

    摘要： A cumulative error D is calculated by sequentially adding up errors, each representing a difference between a given average target number Ba and a number Bg of bits generated during every predetermined period of a coded bit stream. In determining a number Bt of bits allocated to a compression coder, a provisionally allocated bit number Bst is preset based on a coding complexity X such that a number of bits allocated to a scene with a high coding complexity exceeds the average target number Ba as for a frame just after the change of scenes. And if the cumulative error D exceeds a predetermined value, the provisionally allocated bit number Bst is corrected in accordance with the magnitude of the cumulative error D so as to be reducible to, but not less than, the average target number Ba. As for frames within the same scene on the other hand, a previously allocated bit number Bt is sequentially updated such that the cumulative error D does not exceed a predetermined maximum value Dmax. Accordingly, even if a series of scenes with high coding complexities X appear consecutively, a number Bt of bits allocated to each of these scenes can always be at least equal to the average target number Ba, while the total number of bits generated can also be regulated. As a result, high image quality is ensured.

    摘要翻译： 通过依次相加错误来计算累积误差D，每个错误代表给定的平均目标数量Ba和编码比特流的每个预定时段期间产生的位数Bg之间的差异。 在确定分配给压缩编码器的比特数Bt时，基于编码复杂度X来预设临时分配的比特数Bst，使得分配给具有高编码复杂度的场景的比特数超过平均目标数Ba，如 在场景变化之后的一帧。 并且，如果累积误差D超过预定值，则根据累积误差D的大小来校正临时分配的比特数Bst，以减少平均目标数Ba但不小于平均目标数Ba。 对于相同场景中的帧，另一方面，先前分配的位数Bt被顺序地更新，使得累积误差D不超过预定的最大值Dmax。 因此，即使具有高编码复杂度X的一系列场景连续出现，分配给这些场景中的每一个的比特数Bt总是可以至少等于平均目标数量Ba，而生成的总比特数也可以是 规定。 结果，确保了高图像质量。