Browse Prior Art Database

CALIBRATION STRIP DIAGNOSTICS

IP.com Disclosure Number: IPCOM000025018D
Original Publication Date: 1983-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 54K

Publishing Venue

Xerox Disclosure Journal

Abstract

During calibration of a charge coupled device (CCD), location of failed CCD photosites is recorded automatically. In particular, a known illumination level is reflected to the CCD for calibration. The resulting electrical video signal from the CCD is adjusted to a set level for each photosite location. A failure of the calibration strip (dirt or a scratch) would result in a false indication of a failed CCD.

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/(EROX DISCLOSURE JOURNAL

CALIBRATION STRIP DIAGNOSTICS Proposed Ronald S. Tomory Classification

U.S. C1. 358/213 Int. C1. H04n 3/14

During calibration of a charge coupled device (CCD), location of failed CCD photosites is recorded automatically. In particular, a known illumination level is reflected to the CCD for calibration. The resulting electrical video signal from the CCD is adjusted to a set level for each photosite location. A failure of the calibration strip (dirt or a scratch) would result in a false indication of a failed CCD.

While running calibration, the location of the failed photosites is recorded for use in isolation of the failure to the CCD or the calibration strip. If the calibration software determines that the photosites that appear to have failed exceed the specification for the acceptable failure rate of photosites for a CCD, a failure code will be generated, and the Technical Representative summoned.

0 The method to isolate the failure between the CCD and the calibration strip would be for the Technical Representative to note the failed photosite locations. He would then run the calibration again, while biasing the calibration strip to one side.

failure is the calibration strip. If the failed photosites remain the same, the failure is not the calibration strip.

If the failed photosite shifted in the same direction as the calibration strip, the c

Volume 8 Number 2 March/April 1983

I 157

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