Image analysis – Histogram processing – For setting a threshold
Patent
1991-09-20
1992-06-16
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 50, 358456, 358458, G06K 938
Patent
active
051230607
ABSTRACT:
Experiential gradation correction curves for sample images are prepared. By analyzing the experiential gradation correction curves and accumulated density histograms of the sample images, two points (Y.sub.1, Q.sub.1) and (Y.sub.2, Q.sub.2) are specified, where Y.sub.1 and Y.sub.2 are values of accumulated occurrence and Q.sub.1 and Q.sub.2 are halftone dot percentages for image reproduction. The values Y.sub.1 and Y.sub.2 through an accumulated density histogram of an original image whose gradation is to be corrected. A gradation correction curve Q=G(x) is determined so as to pass through the two points (x.sub.1, Q.sub.1) and (x.sub.2, Q.sub.2).
REFERENCES:
patent: 4472736 (1984-09-01), Ushio et al.
patent: 4791678 (1988-12-01), Iwase et al.
patent: 4792979 (1988-12-01), Nomura et al.
Cho Masamichi
Kurusu Yasuo
Nomura Akihiro
Sakamoto Takashi
Takita Nobuhiro
Boudreau Leo H.
Dainippon Screen Mfg. Co,. Ltd.
Stellrecht Barry
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