Browse Prior Art Database

Optical Scanner Maintenance and Initialization

IP.com Disclosure Number: IPCOM000085899D
Original Publication Date: 1976-Jun-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Estry, RH: AUTHOR [+4]

Abstract

Failures in the scanner of an optical image-processing system are difficult to detect, because of the complex transfer functions and because many scanner subsystem failures produce a degraded overall system performance rather than readily identifiable error conditions. Also, such failures are difficult to separate from errors caused by poor quality input images. Scanner failures are especially serious where the image is stored for subsequent processing, so that reentry of the image is not feasible. Also, some scanners have adjustments which must be made periodically for acceptable performance.

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Optical Scanner Maintenance and Initialization

Failures in the scanner of an optical image-processing system are difficult to detect, because of the complex transfer functions and because many scanner subsystem failures produce a degraded overall system performance rather than readily identifiable error conditions. Also, such failures are difficult to separate from errors caused by poor quality input images. Scanner failures are especially serious where the image is stored for subsequent processing, so that reentry of the image is not feasible. Also, some scanners have adjustments which must be made periodically for acceptable performance.

Optical scanner 10 includes light source 11 for document 12 and a photodetector array 13 for converting reflected light to electrical signal, which are then amplified by amplifier 14. Analog-to-digital (A/D) converter 15 produces digital representations of the signals; black/white (B/W) decision logic 16 outputs binary-valued signals indicating whether each scanned area is part of the image or the background of document 12.

Diagnostic apparatus 20 includes facilities for introducing known optical images, analog waveforms and digital data into scanner 10 for failure detection and for initialization. Apparatus 20 is controlled by, and sends scanner data to, local data processor 30 and a remote host processor 40, via an adapter 21. The output of light source 11 is monitored directly by photodetector 22, whose output is transmitted...