Apparatus for image coding and decoding based on color component

Details Apparatus for image coding and decoding based on color component Apparatus for image coding and decoding based on color component

1992-11-02

1995-01-17

Rogers, Scott A.

Facsimile and static presentation processing

Natural color facsimile

Specific image-processing circuitry

358520, 358433, H04N 1415, H04N 146

Patent

active

053830377

ABSTRACT:
An image coding apparatus includes a color component. converter 2 for converting an input image signal 1 into predetermined color spaces which have been subdivided into independent color components, a segmenting circuit 4 for subdividing the converted image signals into predetermined image regions for the respective color components, a color information selecting circuit 9 for judging a condition of the color component of the input image based upon the components of the input image for each image region, and also a coding device 5 for performing a coding process with respect to the respective color components. In the color information selecting circuit 9, a judgement is made whether or not there is color information by comparing the pixel component of the pixel within the input image block with a predetermined threshold value. When it is judged that the input image block corresponds to the monochromatic information, the color difference component is not transferred or not stored. Only when it is judged that the input image block corresponds to the color information, the color difference component is transferred, or stored.

REFERENCES:
patent: 3604840 (1971-09-01), Sharp
Trend On International Standardization for Color Still Picture, T. Omachi, NEC Corporation, pp. 43-48 (1990). No translation to English.

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