Method and apparatus for dynamic white point adjustment

摘要

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 (312), green (310) and blue (308) channels of a CCD array (116). Alternatively, the gain of one color channel may be held constant and measured to determine the light intensity of the light source (106) as the temperature of the light source (106) varies. The power to the light (106) is then changed to maintain the intensity of the light source (106) within a predetermined range. The three color channels (308, 310, 312) 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. <IMAGE>