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AUTOMATIC PAPER SIZE SENSING AND LEAD EDGE DETECTION USING FULL WIDTH (1 TO 1) IMAGE SENSORS

IP.com Disclosure Number: IPCOM000025870D
Original Publication Date: 1988-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 93K

Publishing Venue

Xerox Disclosure Journal

Abstract

A significant feature of electronic scanning is the ability to manipulate images. This ability is necessarily coupled with the ability to locate particular images or portions on the document as it is scanned by an imager on a platen or driven past an imager by a pair of pinch rollers with a constant velocity transport (CVT). This feature is well known, and is sometimes used for calibration of scanning devices.

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XEROX DISCLOSURE JOURNAL

I

AUTOMATIC PAPER SIZE SENSING AND LEAD EDGE DETECTION USING FULL WIDTH (1 TO 1) IMAGE SENSORS Richard B. Eaton

Proposed Classification
U.S. C1.358 Int. C1. H04n

A significant feature of electronic scanning is the ability to manipulate images. This ability is necessarily coupled with the ability to locate particular images or portions on the document as it is scanned by an imager on a platen or driven past an imager by a pair of pinch rollers with a constant velocity transport (CVT). This feature is well known, and is sometimes used for calibration of scanning devices.

This proposal is directed to a method to provide edge information to any device where it is required, e.g. a printer. In the case of a printer, this information might be used to select which paper tray supports a desired sheet size. In the case of the electronics between the scanner and the printer, it could provide information on memory configuration.

The lead and trail edges of a document may be detected as the document passes through a CVT. The width of the page is also determinable by the image sensor. The document is directed past a background which either reflects light away from the sensors, or reflects more than the highest reflectance document. Presence or absence of the document is determined in accordance with the change in image information detected by the sensors, in the same way that images on a document are found. A thresholding operation may be used to produce data indicative of the presence or absence of...