Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1983-04-29
1985-09-24
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
356398, 358 93, H04N 718
Patent
active
045436029
ABSTRACT:
In a surface inspection method in which parallel rays passing through a thin slit are projected onto a surface of a specimen and a luminous line formed on the specimen surface by the parallel rays is viewed by a television camera so as to inspect the specimen surface, a photo-electric signal showing the luminous line is picked up from an output video signal of the television camera. The time from rising state of the horizontal synchronizing signal contained in the video signal to occurrence of a pulse of the photo-electric signal is measured in each period of the horizontal synchronizing signal. The time data in each period is compared with a previously set reference value, and whether or not the specimen passes the inspection is discriminated based on variation of the comparison result.
REFERENCES:
patent: 3794427 (1974-02-01), Shibata
patent: 3976382 (1976-08-01), Westby
patent: 4352430 (1982-10-01), Maier
Hayashi Chikahisa
Kai Tooru
Britton Howard W.
Toyoda Gosei Co,., Ltd.
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