Browse Prior Art Database

Integrated Device for Optical Edge Detection

IP.com Disclosure Number: IPCOM000052288D
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

DiStefane, TH: AUTHOR

Abstract

The optical detectors used in specialized applications, such as OCR (optical character recognition) systems, need not preserve grey scale information in the image. For OCR application, a detector should provide information on the local black or white intensity of the image. One method of finding the local black/white intensity of the image is to find the black to white and the white to black transition in the edges of characters. A detector which discriminates the edges of characters can be an advantage in doing image processing for OCR applications.

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Integrated Device for Optical Edge Detection

The optical detectors used in specialized applications, such as OCR (optical character recognition) systems, need not preserve grey scale information in the image. For OCR application, a detector should provide information on the local black or white intensity of the image. One method of finding the local black/white intensity of the image is to find the black to white and the white to black transition in the edges of characters. A detector which discriminates the edges of characters can be an advantage in doing image processing for OCR applications.

A method is presented for doing optical detection on a silicon detector device. The detector itself is shown in the above schematic diagram. Each detector cell contains two p-n junction detector elements; one element 10 of the detector is in the center of the picture element, while the second element (with the same total area as the first) is a ring 12 which surrounds the first picture element.

The optically generated charge on each of the control elements produced during the integration time is shifted into a C:CD (charge-coupled device) shift register 14 which, in turn, shifts the charges from the line of central detectors out to a charge detector
16. Similarly, the optically generated charge from each of the peripheral elements is shifted into a CCD shift register 18 which shifts the charges from the line of peripheral detectors out to a charge detector 20. Each pair of...