Patent ID: 6552829
Filing Date: 2003-04-22
Classification: H04N

Abstract:
An optical reading head system having an acceptably calibrated pixel output, the system comprising:a scanning station for receiving a document to be scanned, the scanning station including an exposure region, the exposure region including an image region; a detector including an array of photosensitive sites for sensing reflected light from the document at an area corresponding to the exposure region, the sensing occurring during a detector exposure period to generate a pixel output profile of the area of the document corresponding to the image region; a plurality of light sources for lighting the exposure region, wherein each light source emits an individually controlled amount of light to the exposure region during a detector exposure period such that the system's pixel output is acceptably calibrated; a feed mechanism for advancing the document through the scanning station; and a document advancement transducer that tracks the document's advancement through the scanning station and generates a document advanced signal indicating that the document has advanced a specified distance, wherein the document advanced signal is utilized to trigger the detector exposure period.