Color picture encoding system

Abstract

PURPOSE: To encode not only a multi-value color picture and a binary color picture but also a color picture being a mixture of both the pictures in an excellent way by encoding a multi-value color picture of a block discriminated to be an edge part, encoding a difference of the binary and multi-value color picture of the block discriminated to be the edge part and encoding the multi- value color picture of a block discriminated to be a non-edge part. CONSTITUTION: A multi-value color picture signal 100 from a picture memory 20 is binarized for each color by a binarizing circuit 21 and a block edge discrimination section 19 discriminated whether or not each block of a prescribed size is an edge part. A binarizing signal 101 is selected by a selector 28 from a block discriminated to be an edge part and a mask signal 110 is selected from a block discriminated to be a non-edge part. Then a binary color signal 108 read from a binary picture memory 22 is code-processed by a coder A 25 for binary color signal coding and a multi-value color picture code suitable for a photographic picture is obtained. Similarly, a difference between a binary and a multi-value color picture and a multi-value color picture at a non-edge are coded at a coder 26 via a differential coder and a various coding picture is obtained. COPYRIGHT: (C)1992,JPO&Japio

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    Publication numberPublication dateAssigneeTitle
    JP-H0463064-AFebruary 28, 1992Nippon Telegr & Teleph Corp Hybrid picture encoding and decoding device
    US-5416606-AMay 16, 1995Canon Kabushiki KaishaMethod and apparatus for encoding or decoding an image in accordance with image characteristics