| 摘要 |
PURPOSE:To improve greatly the background picture quality and to suppress the effect of noises produced at a static area, by separating a mobile area from a static area within a screen and applying the rough quantization to the static area with the fine quantization applied to the area where the mobile area is changed to the static area respectively. CONSTITUTION:A subtractor 13 produces a frame difference, i.e., an estimated error signal from an input signal and an estimated signal supplied via a line 1413. This error signal is outputted to a quantizer 16. The quantizer 16 outputs the quantization output of the estimated error to a comparator 17 when no subsample is designated and then zero to the comparator 17 when the subsample is designated respectively. The comparator 17 sets the absolute value of the quantized estimated error at zero when said absolute value is smaller than the dead zone designated value and the absolute value is outputted as it is when the absolute value is larger than said dead zone designated value. AN adder 18 adds the estimated error and the estimated signal together. An interpolation circuit 15 receives the interpolation from the local decoded signals of peripheral picture elements when the notice picture element is sampled. While the picture element is outputted as it is to a frame memory 14 when it is not sampled. |
