Method of compressing halftone image data

Details Method of compressing halftone image data Method of compressing halftone image data

1989-05-30

1991-01-01

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Reduced time or bandwidth for static image communication

358432, 3582613, H04N 140

Patent

active

049822934

ABSTRACT:
A method applicable to an image filing system or similar system for recording data representative of a halftone image by compressing the data and reconstructing the compressed data. In an input two-dimensional halftone image, the coordinates points where a difference of density changes in the x direction are determined to produce an x direction transition point pattern associated with the coordinates. A y direction transition point pattern is produced by effecting similar processing in the y direction. Further, an AND pattern of the x direction and y direction transition point patterns is generated. The pixels based on the AND pattern are determined to be the characteristic density and are coded, the densities of the other pixels being calculated at the time of decoding. The transition patterns are individually coded by transforming the differences of density data into Huffman codes.

REFERENCES:
patent: 3849592 (1974-11-01), Rosenheck
patent: 4266249 (1981-05-01), Chai

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