Dither picture data pre-compression processing method

Details Dither picture data pre-compression processing method Dither picture data pre-compression processing method

1994-02-10

1995-10-31

Mancuso, Joseph

Image analysis

Image compression or coding

Quantization

3582611, G06K 938, H04N 1419

Patent

active

054637031

ABSTRACT:
A dither picture data pre-compression processing method includes steps of dividing the picture document by a dither matrix into a plurality of pixel matrices; taking the pixel values of the same location from every pixel matrix and gathering them into respective groups, permitting every group to be respectively corresponded by a dither matrix element; and using the dither matrix element as the threshold value to process the pixel values of every group into a corresponding binary data for further picture data compression coding.

REFERENCES:
patent: 4965843 (1990-10-01), van Dorsselaer
patent: 5130821 (1992-07-01), Ng
patent: 5201013 (1993-04-01), Kumagai
patent: 5243441 (1993-09-01), Kawata
patent: 5243446 (1993-09-01), Pollich et al.
patent: 5251046 (1993-10-01), Kato et al.

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