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DOCUMENT EDGE DETECTION DESIGN FOR A CVT IMAGE INPUT MODULE

IP.com Disclosure Number: IPCOM000025020D
Original Publication Date: 1983-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 93K

Publishing Venue

Xerox Disclosure Journal

Abstract

Referring to the drawing figures, control of the raster scanning function has heretofore been accomplished by detection of the leading and trailing edges of the document 5 being scanned as the document enters and exits the scanning area. Since for control purposes the scanning area is normally defined by the presence or absence of document 5 in the drive nip formed between document feeder roll 6 and resilient base 7, the document must be detected at the centerline of feeder roll 6. However, design and configuration constraints may restrict the use of conventional reflective type object sensors or detectors for this purpose.

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DOCUMENT EDGE DETECTION DESIGN

FOR A CVT IMAGE INPUT MODULE William H. Bruce, Jr.

Richard M. Baran Richard A. Beck Julian Braiman William Kingsley

Proposed Classification
U.S. C1. 358/288
Int. C1. H04n 1/17

Volume 8 Number 2 March/April 1983 16 1

[This page contains 1 picture or other non-text object]

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DOCUMENT EDGE DETECTION DESIGN FOR A CVT IMAGE INPUT MODULE {Contld)

Referring to the drawing figures, control of the raster scanning function has heretofore been accomplished by detection of the leading and trailing edges of the document 5 being scanned as the document enters and exits the scanning area. Since for control purposes the scanning area is normally defined by the presence or absence of document 5 in the drive nip formed between document feeder roll 6 and resilient base 7, the document must be detected at the centerline of feeder roll 6. However, design and configuration constraints may restrict the use of conventional reflective type object sensors or detectors for this purpose.

This proposal avoids the need to use external document sensors and detectors by instead using the scanning array itself, which may, for example, comprise a Charge Coupled Device or CCD 8 in cooperation with a highly reflective target 9 in the viewing area of CCD 8 to detect the presence and absence of the document 5 in the scanning area.

In Figure 1, the proposed sensor is shown prior to the arrival of document 5 in the nip formed by feeder roll 6 and base 7. There, the highly reflective target is located in the viewing area of...