Method of and apparatus for correcting gradation of image repres

Details Method of and apparatus for correcting gradation of image repres Method of and apparatus for correcting gradation of image repres

1987-08-06

1988-12-20

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 1, 358283, G06K 936

Patent

active

047929790

ABSTRACT:
A standard gradation correction curve independent of characteristics of an original image is prepared in advance. An accumulated density historgram curve of the original is obtained from image data of the original. A first gradation correction curve is obtained by modifying the standard gradation correction curve, while a second gradation correction curve is obtained by modifying the accumulated density histogram curve. A third gradation correction curve is obtained by linear combination of the first and second gradation conversion curves to perform gradation correction of the image data on the basis of the third gradation correction curve.

REFERENCES:
patent: 4450482 (1984-05-01), Ackerman
patent: 4472736 (1984-09-01), Ushio et al.
patent: 4667228 (1987-05-01), Kawamura
patent: 4679095 (1987-07-01), Kitamura et al.
patent: 4727434 (1988-02-01), Kawamura
H. Archer, "Automatic Analysis of Reproduction Copy for Optimum Tone Reproduction", 1985 Proceedings of Technical Association of the Graphic Arts (1985): 546,555.

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