Illumination Regulation for Array Scanner
Original Publication Date: 1980-Jan-01
Included in the Prior Art Database: 2005-Feb-13
Figs. 1 and 2 show alternative feedback loop techniques for controlling the background light level sensed by a photosensor array in a document scanner. In Fig. 1, the feedback loop controls the illumination lamp. In Fig. 2, the feedback loop controls the sampling time or exposure time for the photosensor array.