Method of generating gradation correction curve for correcting g

Details Method of generating gradation correction curve for correcting g Method of generating gradation correction curve for correcting g

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.

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