Method of an apparatus for compressing images data

Details Method of an apparatus for compressing images data Method of an apparatus for compressing images data

1990-12-14

1993-04-20

Coles, Sr., Edward L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358426, H04N 146

Patent

active

052047385

ABSTRACT:
An image is conceptually divided into pixel blocks each having a plurality of pixels. RGB image data representing the image are converted into luminance data and color difference data in the NTSC form. Standard deviation values of these data are calculated in each pixel block and are compared with threshold values, so that the pixel blocks are classified into two types. The image data in the pixel blocks of respective types are compressed at different compression rates to obtain image data compressed.

REFERENCES:
patent: 4776030 (1988-10-01), Tzou
patent: 5018024 (1991-05-01), Tanioka
IEEE International Conference on Communications; vol. 1; pp.B.4.6-1 to B.4.6-5; Kwarta et al.; Jun. 1983.

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