Method and apparatus for data reduction in a video image data re

Details Method and apparatus for data reduction in a video image data re Method and apparatus for data reduction in a video image data re

1991-12-26

1992-10-27

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358133, H04N 713

Patent

active

051594498

ABSTRACT:
Reducing the amount of data required to describe a greyscale image is achieved by determining the modal greyscale and giving all pixels within a tolerance level of, for example, .+-.2 greyscale levels of the modal greyscale, a logic value of 0. This leads to significant data reduction since proportionally very many pixels are effected. The contrast extremes of the image are unaffected however so that the image remains reasonably comprehensible.

REFERENCES:
patent: 3580999 (1971-05-01), Mounts
patent: 4414580 (1983-11-01), Johnsen
patent: 4517596 (1985-05-01), Suzuki
patent: 4774574 (1988-09-01), Daly
"Recommendation H.261-Video codec for audiovisual serices at p x 64 kbits/s," CCITT STUDY GROUP XV-REPORT R 37, Geneva Meeting, Jul. 16-27, 1990, pp. 79-103.

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