Background light intensity compensation circuit for a line...

Details Background light intensity compensation circuit for a line... Background light intensity compensation circuit for a line...

H - Electricity

04

N

350/15

H04N 1/04 (2006.01) G06K 7/10 (2006.01)

Patent

CA 1131346

14 48,350 ABSTRACT OF THE DISCLOSURE In a line scan camera system employed to extract information from marks or characters on a document, a memory circuit is used to store the average white and black video output from the camera so that a given white- to-black transition can be compared to adaptive white and black references to compensate for variations in document background light intensity and vignetting associated with the lens of the line scan camera system.

355834

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