Image analysis – Image enhancement or restoration
Patent
1997-04-24
1999-05-18
Johns, Andrew W.
Image analysis
Image enhancement or restoration
382252, 382260, 358348, G06K9/40
Patent
active
059058161
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. 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).
REFERENCES:
patent: 5307425 (1994-04-01), Otsuka
patent: 5696846 (1997-12-01), Shimazaki
Davis Monica S.
Fuji Photo Film Co. , Ltd.
Johns Andrew W.
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