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Compensating for Delays in a Flying Spot Optical Scanner

IP.com Disclosure Number: IPCOM000093695D
Original Publication Date: 1966-Jan-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 3 page(s) / 51K

Publishing Venue

IBM

Related People

Nickel, TY: AUTHOR [+2]

Abstract

The arrangement is for compensating for inertia in a flying spot scanner system in which the signals developed as a result of scanning a character must be appropriately displaced to match a voltage matrix, set up by some previous scanning operation. Scanning is carried out by a conventional cathode ray tube scanner including cathode ray tube 5 with deflection yoke driving circuitry 7 under the control of scanner controls and spot positioning circuits 9. Scanning video signals are generated by photomultiplier tube 11. The signals are amplified and appropriately shaped by video detection circuits 13 from whence they are passed via the scanner controls and spot positioning circuit 9 to an operational amplifier 15 having the usual feedback resistor 17. Two input resistors 19 and 21 are connected to resistor 17.

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Compensating for Delays in a Flying Spot Optical Scanner

The arrangement is for compensating for inertia in a flying spot scanner system in which the signals developed as a result of scanning a character must be appropriately displaced to match a voltage matrix, set up by some previous scanning operation. Scanning is carried out by a conventional cathode ray tube scanner including cathode ray tube 5 with deflection yoke driving circuitry 7 under the control of scanner controls and spot positioning circuits 9. Scanning video signals are generated by photomultiplier tube 11. The signals are amplified and appropriately shaped by video detection circuits 13 from whence they are passed via the scanner controls and spot positioning circuit 9 to an operational amplifier 15 having the usual feedback resistor 17. Two input resistors 19 and 21 are connected to resistor 17.

During a first scanning operation, the character outline is determined by appropriately scanning the character to determine its limits. Voltages are developed which are stored in suitable units. At the one extreme position in the horizontal direction of scan, a voltage is stored in storage unit 23 which is an analog representation of the positive extreme of the character. At the opposite end of the scan, a voltage is stored in storage unit 25 which is indicative of the negative extreme of the character. The difference in these two voltages represents an analog representation of the width of the character which can be considered as extending from a value designated as x max to a value designated as x min.

During the subsequent recognition scan of the character, the signals derived from scanning the character are compared with the volt...