Method and apparatus for controlling contrast

Details Method and apparatus for controlling contrast Method and apparatus for controlling contrast

2011-01-04

2011-01-04

Bella, Matthew C (Department: 2624)

Image analysis

Image enhancement or restoration

Intensity, brightness, contrast, or shading correction

C382S168000, C348S353000, C702S180000

Reexamination Certificate

active

07865033

ABSTRACT:
A method and apparatus for contrast control is provided. The apparatus includes a cumulative density function which provides a second cumulative density function modified from a first cumulative density function based on a first luminance histogram of an input image; a transformer function provider which provides a transform function based on the first cumulative density function and the second cumulative density function; a compensation unit which compensates the transform function based on a predetermined illumination level; and a transform unit which transforms a luminance distribution of the input image based on the compensated transform function.

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USPTO Office Action dated Nov. 17, 2009 issued in co-pending U.S. Appl. No. 11/584,666.

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