Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-09-30
1984-12-04
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
250563, 364507, H04N 718
Patent
active
044867778
ABSTRACT:
An apparatus and method for detecting defects in a substrate, including the periphery of the substrate, by the use of an image pickup device which sequentially scans the substrate along each of a plurality of vertically displaced horizontal lines for equal horizontal scanning periods. The analog output of the pickup device is coded to provide a binary coded signal having a polarity determined by the amount of light reflected from the substrate at each incremental portion of the scanning periods. The binary coded signal is shifted for a first interval which is less than the horizontal scanning period to obtain a first shifted output, and then further shifted for a second interval, measured from the end of the first interval, which is equal to the horizontal scanning period to obtain a second shifted output. The polarities of the first and second shifted outputs are compared in a comparator, the presence of a defect in the substrate being indicated when the first and second shifted outputs have predetermined opposite polarities at a given instant of time followed by a reversal in the polarities of each of the first and second shifted outputs.
REFERENCES:
patent: 4207593 (1980-06-01), Deutsch
patent: 4364113 (1982-12-01), Sengebusch
Britton Howard W.
Fuji Electric Company Ltd.
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