Browse Prior Art Database

Character Recognition by Automatic Comparison

IP.com Disclosure Number: IPCOM000094588D
Original Publication Date: 1965-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Smeltzer, NG: AUTHOR

Abstract

An unknown character A on document 5 is scanned by scanner 7. Photomultiplier tube 9 generates an electrical signal such as waveform 11 in response to a single vertical scan over the left edge of the A. At the same time, scanner 13 scans the first character E on display 15 containing an entire alphabet of reference characters, Photomultiplier tube 17 generates an electrical signal such as waveform 19 in response to a single vertical scan of the left portion of the E.

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Character Recognition by Automatic Comparison

An unknown character A on document 5 is scanned by scanner 7. Photomultiplier tube 9 generates an electrical signal such as waveform 11 in response to a single vertical scan over the left edge of the A. At the same time, scanner 13 scans the first character E on display 15 containing an entire alphabet of reference characters, Photomultiplier tube 17 generates an electrical signal such as waveform 19 in response to a single vertical scan of the left portion of the E.

In operation, comparator 21 compares the two waveforms 11 and 19 sending a signal to controller 23. This effects the operation of scanners 13 and 17, particularly the operation of scanner 13. The latter skips from one reference character to another in an attempt to find the best match with unknown character
A.

The reference characters are grouped on display 15 in accordance with their common features. Therefore, when the reference E is compared with the unknown A, waveforms 19 and 11 are produced on the first vertical scan. Comparator 21 sends a signal through controller 23 indicating that the first group of reference characters are mismatches. Accordingly, scanner 13 is skipped to the next row of reference characters without further examination of the reference E or other references on the first row. The system continues taking only a minimum number of samples of the reference characters necessary to reject an entire row until the reference A is reached....