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21. 发明授权

US4837618A Moving image signal coding system 失效
标题翻译：运动图像信号编码系统
公开(公告)号：US4837618A
公开(公告)日：1989-06-06
申请号：US118467
申请日：1987-11-09
申请人： Yoshinori Hatori , Yoichi Kato , Mutsumi Ohta , Yasuhiro Kosugi
发明人： Yoshinori Hatori , Yoichi Kato , Mutsumi Ohta , Yasuhiro Kosugi
IPC分类号： G06T9/00 , H03M7/30 , H03M7/38 , H04N7/50
CPC分类号： H04N19/132 , H04N19/107 , H04N19/176 , H04N19/61
摘要： A system of coding moving image signals produces a predictive error signal by a predictive coding based on inter-frame correlation and quantizing the predictive error signal for each block of a picture frame constituted by N lines of M pixels. The system includes a block coding/non-coding decision unit for calculating a first evaluation value Sm of the predictive error signal for each block of the picture frame. This unit decides that block non-coding is applicable when the first evaluation value Sm is less than a first threshold value T.sub.1 and that block coding is applicable when the first evaluation value Sm is greater than the first threshold value T.sub.1. The predictive error signal is not transmitted when the result of the decision is for block non-coding, and the predictive error signal is quantized and transmitted when the result of the decision is for block coding.
摘要翻译：编码运动图像信号的系统通过基于帧间相关的预测编码产生预测误差信号，并对由N个M个像素组构成的图像帧的每个块的量化预测误差信号。该系统包括块编码/非编码决定单元，用于计算图像帧的每个块的预测误差信号的第一评估值Sm。当第一评估值Sm小于第一阈值T1时，该单元决定块非编码是适用的，并且当第一评估值Sm大于第一阈值T1时可以应用块编码。当决定结果用于块非编码时，不发送预测误差信号，并且当判定结果用于块编码时，预测误差信号被量化并发送。

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