Patent ID: 7995114
Filing Date: 2011-08-09
Classification: H04N

Abstract:
1. A method for providing image illumination calibration for an imaging apparatus having a camera scan system, comprising: generating a plurality of images of a calibration target at a plurality of exposure levels, each image of said plurality of images being represented by a total pixel area; identifying a plurality of zones of said total pixel area, each zone of said plurality of zones corresponding to a particular image of said plurality of images at a particular exposure level of said plurality of exposure levels, with each zone of said plurality of zones representing a pixel sub-area of said total pixel area that excludes saturated pixels; combining said plurality of zones for said plurality of images of said calibration target to generate a final calibration image; and generating a shading table that results in shading correction for said final calibration image to obtain a uniform image of said calibration target over said total pixel area, said shading table including gain and offset values associated with each pixel of said total pixel area.