Image analysis – Histogram processing – For setting a threshold
Patent
1984-10-18
1987-02-03
Ciarlante, Anthony V.
Image analysis
Histogram processing
For setting a threshold
235456, G06K 920
Patent
active
046413588
ABSTRACT:
The reading of the presence or absence of a pencil or similar mark at various locations on a sheet of paper is accomplished by an optical Mark-Reader comprised of a completely solid state sensing mechanism with no moving parts. The Optical Mark Reader (OMR) contains a matrix of light sensitive transistors with their geometry and logic circuits capable of being tailored for a plurality of answer sheets. The internal logic circuits enable certain sections of the page to be read, generate a delay time while the data is being gathered, tell the host computer when the data is complete, and resets the OMR operator control system for successive page readings. Finally, the internal logic circuits and output bus of the OMR takes the "raw" data from the answer sheets and presents information on an output bus in a format allowing any computer (even a micro-computer) to be the host computer.
REFERENCES:
patent: 3315377 (1967-04-01), Stillwell
patent: 3413603 (1968-11-01), Kimura et al.
patent: 3506837 (1970-04-01), Majima
patent: 3549895 (1970-12-01), Sidorsky
patent: 3761688 (1973-09-01), Cassel
patent: 3970990 (1976-07-01), Carson
patent: 3983364 (1976-09-01), Firehammer
patent: 4217487 (1980-08-01), Kjeer
Archambeault Bruce R.
Rancour David P.
Auton William G.
Ciarlante Anthony V.
Matthews Willard R.
Singer Donald J.
The United State of America as represented by the Secretary of t
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