US 6,212,234 B1 · Color image encoding apparatus and color image decoding apparatus

Abstract

A color image of a dot-sequential system is converted into a color image of a field-sequential system and a color image can be encoded/decoded at a high speed with a high compression ratio. A pixel value of image data of a dot-sequential system is sequentially inputted to a reference area generating means, and the reference area generating means outputs target pixel data and reference area data. A same pixel value distributing and generating means generates and outputs a same pixel value distribution from the target pixel data and the reference area data. A predictive information encoding means encode data in accordance with an encoding generating table, and outputs predictive information encoded data and an encoding result signal. A dot-sequential/field-sequential image converting means converts pixel data of dot-sequential system into image data of field-sequential system when data cannot be encoded. A predictive error calculating means calculates and outputs a predictive error based on a pixel value data of field-sequential system. A predictive error encoding means encodes a predictive error, for example, in an arithmetic coding fashion.

Claims8

Dependent claims

A color image encoding apparatus for encoding first color image data which is not divided per color element but handled as single data in such a manner that said first color image data can be decoded as second color image data which is handled as a plurality of data sets for respective color elements, said color image encoding apparatus comprising:

reference area generating means for collecting from said first color image data a color pixel value of a target pixel to be encoded and a plurality of color pixel values at a peripheral region of said color pixel value by scanning said first color image data and outputting these color pixel values as reference area data;
same pixel distributing and generating means for detecting on the basis of said reference area data the manner in which pixels having the same color pixel value as that of said target pixel are distributed around said target pixel and outputting a detected result as the same pixel value distribution;
predictive information encoding means for determining pixel value predictive information based on said pixel value distribution and outputting said pixel value predictive information as a predictive information code;
pixel value converting means for converting the pixel value of said first color image data into a pixel value per color element and outputting a target pixel value per color element;
pixel value predicting means for predicting a target pixel value per color element to be encoded from pixel values of corresponding color elements within a reference area and outputting said target pixel value as a predictive pixel value per color element;
predictive error calculating means for calculating and outputting a predictive error between a target pixel value per color element and a predictive pixel value of said corresponding color element;
and
predictive error encoding means for encoding a predictive error per color element and outputting the encoded predictive error as a predictive error code.

5 more elements

Dependencies are inferred from the claim text.

Color image encoding apparatus and color image decoding apparatus

Life of this patent

Color image encoding apparatus and color image decoding apparatus

Life of this patent

Abstract

Claims8