Digital color image processing method with shape correction of h

Details Digital color image processing method with shape correction of h Digital color image processing method with shape correction of h

1985-11-01

1987-06-30

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, 355 38, G03F 308, H04N 146, G03B 2780

Patent

active

046774653

ABSTRACT:
In a method for processing digital color images derived from photographic film, the method employing color reproduction functions generated by normalizing random samples of color values from different colors, sampling of color values from noisy areas of an image, or scanner noise can distort the randomness of sampling and result in unwanted contrast reductions and color shifts in the processed digital images. The problem is solved by correcting the shapes of the distributions of color value samples toward normal distributions having the same means and standard deviations as the sample distributions prior to forming the color reproduction functions.

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patent: 4467364 (1984-08-01), Konagaya
patent: 4472736 (1984-09-01), Ushio et al.
"A New Approach to Programming in Photomechanical Reproduction", by Yu. Ovchinnikov et al., W. Banks IPC Science and Technology Press, Guildford, England, 1974, pp. 160-163, Twelfth Annual Conference of Printing Research Institutes.
"Tone Correction of Color Picture by Histogram Modification", by Yoichi Miyake; Nippon Shashin Sakhaishi, V. 48(2), pp. 94-101, 1980.
"A Statistical Method for Image Classification and Tone Reproduction Determination", by R. Chung, Journal of Applied Photographic Engineering, vol. 3, No. 2, Spring, 1977, pp. 74-81.
Abramowitz, Milton, et al., Editors, Handbook of Mathematical Functions, Sixth Printing, Nov. 1967, with Corrections, National Bureau of Standards, pp. 931-933.

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