Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1977-05-17
1981-09-22
Ng, Jin F.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
356401, H04M 700, G01B 1100
Patent
active
042913349
ABSTRACT:
An apparatus for detecting the position of an object. The apparatus has an optical device for magnifying or enlarging a plurality of portions on the object, a photoelectric converter adapted for converting the enlarged portion image into electric signals, a plurality of thresholding circuits adapted for changing analogue signals from the respective photoelectric converter into binary signals with a threshold value determined by a signal level given by a first signal holding circuit, a circuit for calculating the threshold value from the analogue signals, a circuit for detecting the approximate position of a specific pattern in the enlarged portion images through a coarse sampling of the binary signals. A circuit for detecting the exact position of the specific pattern through measuring the area of a specific brightness in a plurality of regions in the enlarged portion images, by a fine sampling of the binary signals, and a controller for controlling the operations of respective circuits.
REFERENCES:
patent: 3693154 (1972-09-01), Kubo et al.
patent: 3903363 (1975-09-01), Montone et al.
patent: 4131490 (1978-12-01), Oishi et al.
R. F. Duffy et al., Automatic CCTV Positioning System _1-72 IBM Tech. Disclosure vol.-14-No. 8.
Ejiri Masakazu
Hamada Toshimitsu
Kashioka Seiji
Mese Michihiro
Miyatake Takafumi
Coles Edward L.
Hitachi , Ltd.
Ng Jin F.
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