Automated tone correction apparatus and method using filtered hi

Details Automated tone correction apparatus and method using filtered hi Automated tone correction apparatus and method using filtered hi

1992-11-30

1995-06-20

Rogers, Scott A.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358521, 358522, H04N 160

Patent

active

054265177

ABSTRACT:
An image processing system redistributes image luminance values in an image represented in u'v'L* space to achieve a near-optimal fit of luminance data to available dynamic range and to enhance the shape and detail of the resultant image. Redistribution may be accomplished by passing the image through a filter having a peak response at a spatial frequency at which the human eye is highly sensitive, and then equalizing a cumulative histogram of filtered pixels. An image may be transformed to compensate for tone compression which accompanies printing processes.

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patent: 5012333 (1991-04-01), Lee et al.
patent: 5296920 (1994-03-01), Sakaue et al.
Kodak Precision Color Management VAR Toolkit User's Guide for Macintosh Computers, Colorsense Products, 1991.

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