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ELECTRONIC MEASUREMENT AND COMPENSATION OF SCALING ERRORS IN A SCANNING ENVIRONMENT

IP.com Disclosure Number: IPCOM000026209D
Original Publication Date: 1990-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 54K

Publishing Venue

Xerox Disclosure Journal

Abstract

In an electronic scanning environment where image tolerances can be critical, the need to minimize scaling errors is crucial. An electronic method of measuring scaling errors in the fast scan (top to bottom) and slow scan (side to side) planes can be accomplished using already existing components of the scanning system. By utilizing the internal electronic imaging sensor (CCD),

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XEROX DISCLOSURE JOURNAL

ELECTRONIC MEASUREMENT Proposed Classification AND COMPENSATION OF SCALING
ERRORS IN A SCANNING
ENVIRONMENT
William A. Blitz
Gerald L. Coy

US. C1.358/406 Int. C1. H04n 1/00

In an electronic scanning environment where image tolerances can be critical, the need to minimize scaling errors is crucial. An electronic method of measuring scaling errors in the fast scan (top to bottom) and slow scan (side to side) planes can be accomplished using already existing components of the scanning system. By utilizing the internal electronic imaging sensor (CCD),

precision positioning system (scanning mechanism), and a precision target, scaling errors can be measured to an accuracy of 0.0025" (0.0635 mm) and displayed. This information can be used as a calibrating tool in the field or as an automatic correction predictor in real time operation. By counting pixels and incremental displacement between reference marks on a target and comparing them to the defined values, various adjustments or automatic compensations can be made to minimize inaccuracies in the opiical system.

XEROX DISCLOSURE JOURNAL Vol. 15 No. 5 September/October 1990 369

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370 XEROX DISCLOSURE JOURNAL Vol. 15 No. 5 SeptembedOctober 1990

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