Apparatus for calculating a degree of white balance adjustment f

Details Apparatus for calculating a degree of white balance adjustment f Apparatus for calculating a degree of white balance adjustment f

1995-09-26

1997-04-08

Brinich, Stephen

Facsimile and static presentation processing

Natural color facsimile

Color separation

348223, H04N 973

Patent

active

056193475

ABSTRACT:
Pieces of white balance information indicating color features of a colored picture or picture blocks obtained by partitioning the colored picture are extracted from piece of picture data of the colored picture in an extracting unit. Whether or not a white region exist in the colored picture is judged in a white region judging unit according to the white balance information indicating the color features of the colored picture. When the existence of the white region is judged, a white balance coefficient is calculated in a white balance calculating unit to make the white region white. In contrast, when no existence of any white region is judged, a color distribution axis extending from an original point of a color space to a gravity center of the white balance information indicating the color features of the picture blocks from which pieces of white balance information corresponding to picture blocks of a high chromatic color or a uniform chromaticity are removed is detected in a color distribution axis detecting unit, and the white balance coefficient is calculated to set the color distribution axis to an achromatic color axis of the color space. Therefore, a white balance adjustment adapted to color features of each of colored pictures can be performed.

REFERENCES:
patent: 4954884 (1990-09-01), Nakayama et al.
patent: 5223921 (1993-06-01), Haruki et al.
patent: 5327226 (1994-07-01), Tanabe
patent: 5389969 (1995-02-01), Suzuki et al.

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