Communications: electrical – Digital comparator systems
Patent
1979-11-19
1981-10-13
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
3401463SG, 3401463H, G06K 934
Patent
active
042951216
ABSTRACT:
A device for optical character reading comprising an optical reading unit, a video detector, a segmenting unit, a video buffer, a recognition unit and a controlling micro computer. The computer controls the setting of the threshold value in the video detector, and calculates by means of profile data received from the segmenting unit coordinates for a starting point for recognizing a character in the recognition unit. A comparator in the recognition unit compares bit by bit mask bits from a read only storage with corresponding data bits from the video buffer and stores the result into a status register. A recognized character is transferred from the read only storage to a character register, the computer is interrupted and a character is transferred from the recognition unit to the computer.
The video detector comprises selectively connectable and computer controlled attenuation resistors for setting up a threshold signal curve simulating the form for the video signal curve.
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Enser Mats A.
Hallberg Lars O.
Stalberg Nils G.
Boudreau Leo H.
Brannen Paul M.
International Business Machines - Corporation
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