Weighted-pixel characteristic sensing system

Details Weighted-pixel characteristic sensing system Weighted-pixel characteristic sensing system

G - Physics

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G06K 7/10 (2006.01) G06K 7/14 (2006.01) G06K 9/00 (2006.01) G06K 9/20 (2006.01) G06K 19/14 (2006.01) G07D 7/12 (2006.01) G07D 7/20 (2006.01) H04N 1/029 (2006.01) H04N 1/409 (2006.01)

Patent

CA 1263751

WEIGHTED-PIXEL CHARACTERISTIC SENSING SYSTEM Abstract of the Disclosure A system for sensing a characteristic of a document, e g. translucency, by using radiation from the document at a specific window area. The identified window area is illuminated to provide radiation from the area which is sensed by pixel dissection so that pixels of central location in the window area are weighted for greater significance. The pixel weighting attributes greater significance to the central portion of the defined area thereby increasing the tolerance of the system to misalignment of the window area. The observed characteristic is reduced to signal represen- tations which are compared with registered values as to authenticate the document. Pixel-weighting tech- niques include overlapped pixels, filtered pixels and algebraically weighted pixels.

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