Color image data compressing apparatus and method

Details Color image data compressing apparatus and method Color image data compressing apparatus and method

1989-10-04

1992-11-10

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358133, H04N 932

Patent

active

051628988

ABSTRACT:
A compressing apparatus for compressing color image data including R, G and B data. The apparatus includes a converter for converting the R, G and B data into luminance data and chrominance data, and an encoder. The encoder encodes the luminance data to compressed luminance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive, such as, e.g., in dark or bright areas. The encoder also encodes the chrominance data to compressed chrominance data in a similar manner.

REFERENCES:
patent: 4023199 (1977-05-01), Netravali et al.
patent: 4467346 (1984-08-01), Mori
Proceeding of the IEEE, vol. 69, No. 3, Mar. 1981, pp. 349-384, "Image Data Compression: A Review".
Data Compression by A. J. Johnson, pp. 336-353.
Japanese Article, vol. J67-B, No. 12, Dec. 1984, entitled "High Efficiency Encoding of Colored Pictures Based on Visual Property".
Japanese Article, vol. 16, No. 5 (1987), entitled "A Method of Color Image Quantization Adaptive to Foreground and Background Regions".

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