International Business Machines Corporation

Lars O Hallberg

Mats A Enser

Nils G Stalberg

Helmut Schaal

Bertil E Norstedt

Kurt-Inge Andersson

Karl G Gohl

Victor Gjerstad

A character recognition system comprises a video detector (25) operating with a plurality of threshold signals (V3-V6) in time multiplex mode. Detected video signals are stored in a plurality of storage modules (S3-H S6), one for each time multiplex channel. A signal processor (81) recognizes character data from video data representing a first threshold level (V3) and stored in a first storage module (S3) and subsequently recognizes character data from video data representing a second threshold level (V5) and stored in a second storage module (S3). The system is used in an optical document reader for reading a plural field print line on a document, where the optical characteristics of the various fields are unequal.

Character recognition system and its use in an optical document reader

Communication control functions are performed by an integrated adapter implemented as microcode resident in host CPU storage. The integrated adapter shares a common high speed bus with other CPU facilities. A high speed bus adapter provides an interface between the common high speed bus and low speed line adapters. Communication controlling commands and register structures are described.

Communication controller transparently integrated into a host CPU

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.

Device for optical character reading

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Stalvagen, Sweden

Lars O Hallberg