| 摘要 |
PURPOSE:To improve the efficiency by allocating a code to a degenerative picture element pattern obtained through reduction conversion. CONSTITUTION:An average value calculation circuit 103 calculates an in-block average value of an input picture signal of one frame, a compression processing circuit 104 applies compression processing of a difference PCM and the result is sent via a multiplexer 112. An average value from the circuit 103 is inputted also to a frame memory 105. The content of the memory 105 is referenced to be converted by a reduction conversion pattern generating circuit 106, and all conversion picture element patterns are generated and written in a pattern memory 107. The conversion picture element pattern stored therein is classified by a pattern classification circuit 108. That is, since similar patterns are degenerated into one pattern, the number of picture element patterns is considerably less. The pattern is written in a memory 110 via a sequencing circuit 109, a picture element pattern of a minimum error is selected by an optimum pattern selection circuit 111 and outputted via the multiplexer 112. Thus, the coding efficiency of a moving picture signal is enhanced. |
