Browse Prior Art Database

Character Position Correction Circuitry

IP.com Disclosure Number: IPCOM000076569D
Original Publication Date: 1972-Mar-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 76K

Publishing Venue

IBM

Related People

Hoffman, GF: AUTHOR

Abstract

The character position correction circuitry stores the video bits representing the scanned character in a first storage device and correction information, derived in response to scanning the character, is used to center the character as the bits representing the character are transferred to a second storage device.

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Character Position Correction Circuitry

The character position correction circuitry stores the video bits representing the scanned character in a first storage device and correction information, derived in response to scanning the character, is used to center the character as the bits representing the character are transferred to a second storage device.

Characters on document 12, Fig. 1, are scanned by the beam of cathode-ray tube 10. The beam of cathode-ray tube 10 is focused by lens 11 and light reflected from document 12 is collected by photo-multiplier tube 13. The raw video signal from 13 is quantized by circuit 14 and the quantized video data is entered into shift register 16, under control of signals from timing circuit 15. As the video data enters shift register 16, it is examined by character height profile logic 25 which develops a correction bit count indicating the amount of shift necessary to center the character. The character information is shifted from register 16 to data storage 20 where it is stored in vertical columns A through N, inclusive, with 32 bits in each column. The data is transferred from storage 20, 8 bits at a time, from the first 8-bit positions of column A. The data is passed via character vertical position correlation logic 30 to Buss In register 50, under control of correction information from character height profile logic 25. The data is then transferred from Buss In register 50 to data-processing system 60 which includes a c...