Method of and apparatus for binarizing image signals

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

1995-05-01

1997-12-09

Boudreau, Leo

Image analysis

Image enhancement or restoration

382252, 382270, 358458, G06K 940, G06K 938, H04N 140

Patent

active

056968469

ABSTRACT:
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), and 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). Error diffusion coefficients W1(k,l), W2(k,l), W3(k,l) are prepared in advance which correspond respectively to the filter characteristics of a "Jarvis-type filter", an "elongate rectangular filter", and a "Floyd-type filter". A mixing ratio setting circuit determines mixing ratios t1(I.sub.0), t2(I.sub.0), t3(I.sub.0) depending on the multi-valued image signal I(x,y). The mixing ratios t1(I.sub.0), t2(I.sub.0), t3(I.sub.0) are accumulated and added to the error diffusion coefficients W1(k,l), W2(k,l), W3(k,l), and an error signal E(x-k,y-l) and an error diffusion coefficient W(k,l,I.sub.0) are accumulated and added, producing a diffusion error signal .DELTA.E(x,y). The diffusion error signal .DELTA.E(x,y) is added to the multi-valued image signal I.sub.0 (x,y), producing a corrected multi-valued image signal I(x,y), which is then compared with the threshold signal TH by the comparator to generate a binary image signal P(x,y).

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patent: 5313287 (1994-05-01), Barton
patent: 5325448 (1994-06-01), Katayama et al.
patent: 5438634 (1995-08-01), Kumagai

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