| 摘要 |
PURPOSE:To make it possible to reproduce edge parts exactly by separating edge parts in which the level changes abruptly in picture signals and encoding them. CONSTITUTION:Inputted codes are separated to the first code (output code of an information storing type encoder 5) and the second code (output code of an information non-storing type encoder 8) in a separating section 10 according to synchronizing signals. The first code after separation is decoded by an information storing type decoder 11 and quantized output q(i,j) is reproduced, and the second code after separation is decoded by an information non-storing type decoder 13, and residual signals d'(i,j) for which quantizing process is made is reproduced. The information storing type decoder 11 decodes run length codes and reproduces run of '1' and '0', and at the same time, reproduces q(i,j) by making PCM encoded values of fmax and fmin correspond as level of '1' and '0' respectively. The information non-storing type decoder 13 decodes orthogonal transformation coefficient after quantizing encoded in block unit, and reproduces residual signals d'(i,j) for which quantizing process is made by making reverse orthogonal transformation. The residual signals d'(i,j) are added by an adder 14 in block unit and decoded picture signals f(i,j) are generated.
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