H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/48
H04N 3/12 (2006.01) G06K 9/20 (2006.01) H04N 3/14 (2006.01) H04N 5/217 (2006.01)
Patent
CA 1098204
ABSTRACT OF THE DISCLOSURE Fixed pattern odd/even noise in the video signal output from a self-scanned photosensor array is substantially eliminated by integrating the video signal at the cell scan rate, and converting the resultant to a pulse having a width proportional to the charge current generated by a photosensor cell. Even and odd pulses corresponding to alternate sensor cell video signals are produced, and the pulse widths are compared to form a correction signal. A current sink responsive to the correction signal adjusts the output of the integrator during even cell scans to eliminate fixed pattern odd/even noise in the output video signal. In a specific embodiment, the fixed pattern odd/even noise correction system coacts with an AGC control system and a black reference control system to substantially eliminate fixed pattern odd/even noise and cell clock noise in the output video signal, and to provide an effective system immunity to variations in the coupling capacitance of the photosensor array.
271052
Kirby Eades Gale Baker
Recognition Equipment Incorporated
LandOfFree
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