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12 .量化视觉神经的冗余性在MPEG码中可以实现除去不想要的一些信息。高频空间频率系数要求用较少比特 ,因而可以不精确传送 ,而且在一般视觉距离观看图像时 ,几乎看不到量化杂波。确切地讲 ,最高频率大致比最低频率的量化要粗 1 0倍以上。1 3 .可变长度编码 (VLC:Variable Len
12. Quantify the redundancy of visual nerves Some of the unwanted information can be removed in MPEG code. The high-frequency spatial frequency coefficients require less bits and thus can not be accurately transmitted, and almost no quantization clutter can be seen when the image is viewed at a normal visual distance. Specifically, the highest frequency is approximately 10 times larger than the lowest frequency. 1 3. Variable length coding (VLC: Variable Len