Patent ID: 6744536
Filing Date: 2004-06-01
Classification: H04N

Abstract:
In a document handler and imaging system, wherein different document sheets are sequentially moved past an imaging station by a document feeding system to be illuminated by a document illumination source and imaged by a document imager in the document imaging station, wherein the document imaging station includes a document backing surface having a selected color and a scanning sensor having at least two color sensitive channels and wherein at least one edge of a document sheet is detected in said document imaging station by said document imager, the improvement comprising:a registration parameter detection circuit, the registration parameter detection circuit receiving a set of gray level values for the backing surface from each of the at least two color sensitive channels and automatically determining an average gray level of the backing surface for each of the at least two sensitive channels; the registration parameter detection circuit automatically selecting a registration channel based on the average gray level for each of the at least two sensitive channels and determining a gray level deviation for the registration channel; and the registration parameter detection circuit automatically determining registration parameters based on the average gray level and the gray level deviation of the registration channel.