Method and apparatus for dynamic white point adjustment

Details Method and apparatus for dynamic white point adjustment Method and apparatus for dynamic white point adjustment

1996-01-31

1997-08-05

Rogers, Scott A.

Facsimile and static presentation processing

Natural color facsimile

Measuring, testing, and calibrating

358509, 358516, H04N 104, H04N 148

Patent

active

056548095

ABSTRACT:
A method for dynamically determining and adjusting the color balance of the light strip along one edge of the scanned area and adjusting the gains of independently controlled red, green and blue channels of a CCD array. Alternatively, the gain of one color channel may be held constant and measured to determine the light intensity of the light source as the temperature of the light source varies. The power to the light is then changed to maintain the intensity of the light source within a predetermined range. The three color channels are then compared to a predetermined color balance. If the color balance is outside of a predetermined range, the other two color channels gains are varied in order to maintain the color balance between the three color channels.

REFERENCES:
patent: 4803556 (1989-02-01), Beikirch
patent: 5278674 (1994-01-01), Webb et al.
patent: 5285293 (1994-02-01), Webb et al.
patent: 5336976 (1994-08-01), Webb et al.
patent: 5504524 (1996-04-01), Lu et al.

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