Method for reconstructing a dither matrix

Details Method for reconstructing a dither matrix Method for reconstructing a dither matrix

1987-10-27

1989-01-03

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358298, H04N 140

Patent

active

047960949

ABSTRACT:
The invention provides a method for reconstructing a dither matrix, used to transform a rastered gray-level image into an image of binary pixels, from the dithered image. The method includes the steps of determining the dimensions of the dither matrix from the spatial frequencies present in the dithered image and then determining the threshold values of the dither matrix from the distribution function of the pixels having a specific value.

REFERENCES:
patent: 4651293 (1987-03-01), Kato

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