Compression method for dot image data

Details Compression method for dot image data Compression method for dot image data

1988-05-04

1990-07-24

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Reduced time or bandwidth for static image communication

358432, 3582621, H04N 141

Patent

active

049438697

ABSTRACT:
This invention method performs data compression for dot image data by utilizing the redundancy based on spacial correlation of images and correlation of dot patterns. More particularly, a threshold matrix is rearranged in array according to a predetermined reference, the threshold matrix being used to convert input image data into dot data, so as to output the same logical values continuously from the top and/or from the end of dot data array, and simultaneously dot data are grouped in the unit of a predetermined bits so as to count the number of units having the same and continuous logical values from the top and/or from the end to thereby effectively compress data of dot images by a perfect reproduction system or a non-perfect reproduction system.

REFERENCES:
patent: 4115815 (1978-09-01), Nakagome et al.

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