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PAL制采色电视信号编码以压缩到34Mb/s可容纳到脉码通信三次群中为一个目标。如果采用帧内DPCM分量编码方案,必须把亮度信号压缩到3～3.5bit/pel。我们提出了一个自适应全数字化综合高频编码方案可以达到这个目的。本文分析压缩到3bit/pel的困难,说明了分信道综合高频编码的压缩性能。其次根据图象边沿信号统计性质提出边沿信号的选择和自适应编码方法。对于高质量要求的图象采用一种“组关连度”编码方法来编地址码,在一行内可以容纳较多的边沿。在数字化方面采用FIR低通滤波器,并且设计了和低通滤波器相配的综合高滤波器。计算机模拟结果,在压缩到3.2bit/pel码率时,在质量上达到加权信噪比为52.52dB。
PAL color television signal encoding to compress to 34Mb / s can accommodate pulse code communication three times as a target. If the use of intra DPCM component encoding scheme, the brightness signal must be compressed to 3 ~ 3.5bit / pel. We propose an adaptive all-digital synthesis of high-frequency encoding scheme can achieve this goal. This article analyzes the compression to 3bit / pel difficulties, explains the sub-channel synthesis of high-frequency coding compression performance. Secondly, the edge signal selection and adaptive coding method are proposed based on the statistical properties of the image edge signal. For high-quality images using a “group degree of association” encoding method to address code, in a row can accommodate more edges. In the digital FIR low-pass filter, and the design and low-pass filter to match the comprehensive high-filter. Computer simulation results, in compression to 3.2bit / pel rate, the quality of the weighted signal to noise ratio of 52.52dB.