Method of and apparatus for binarizing image signal

Details Method of and apparatus for binarizing image signal Method of and apparatus for binarizing image signal

1995-03-24

1996-06-25

Rogers, Scott A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358465, 358466, H04N 140, H04N 1405

Patent

active

055305610

ABSTRACT:
To obtain a binary gradation image from a continuous gradation image, a multi-valued image signal I(x,y) is compared with a threshold signal TH by a comparator to produce a binary image signal P(x,y), an error signal E(x,y) is determined from the binary image signal P(x,y) and the multi-valued image signal I(x,y), and the error signal E(x,y) is multiplied by an error diffusion coefficient W(k,l) to produce a diffusion error signals .DELTA.E(x,y). A random number R(x,y) generated by a random number generator and a weighting coefficient f(I(x,y)) generated as a function of an image signal by a weighting coefficient generator are multiplied, and the product is added to the diffusion error signals .DELTA.E(x,y). The sum is added to the multi-valued image signal I(x,y) thereby to produce a corrected multi-valued image signal I(x,y), which is then compared with the threshold signal TH by the comparator thereby generating a binary image signal P(x,y).

REFERENCES:
patent: 4654721 (1987-03-01), Goertzel et al.
patent: 5107346 (1992-04-01), Bowers et al.
patent: 5210602 (1993-05-01), Mintzer

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