Abstract: A document scanner for utilization with a word processing and/or graphics processing equipment, such as a personal computer environment. The document scanner provides improved pixel compensation and gamma compensation techniques as well as improved control in the illumination process of the scanning of a document.

Abstract: A self-scanning linear array (10) is moved (12) in the image plane of a lens to thereby scan the image of an object which has been focused in the image plane. A random access controller controls random access to the information within the scanned image. Commands (14) including mechanical positional parameters (16) and electronic scan parameters (18) are decoded by the master microprocessor (20). The electronic scan parameters in the command provide information such as a user selected transverse axis frame size scan output of the array. An address generator (22) generates addresses in response to output pulses from the array. A windowing sequencer (24) in conjunction with the address generator (22) selectively gates particular ones of the pulses in the train of output pulses from the array in accordance with the electronic scan parameters in the command.