Weighted-pixel characteristic sensing system
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United States of America Patent
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May 31, 1988
Grant Date -
N/A
app pub date -
Jul 25, 1986
filing date -
Jul 25, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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 representations which are compared with registered values as to authenticate the document. Pixel-weighting techniques include overlapped pixels, filtered pixels and algebraically weighted pixels.
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