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A DIGITAL TECHNIQUE OF ADAPTIVE THRESHOLDING/QUANTIZING

IP.com Disclosure Number: IPCOM000024365D
Original Publication Date: 1980-Jun-30
Included in the Prior Art Database: 2004-Apr-02

Publishing Venue

Xerox Disclosure Journal

Abstract

In the application of using a CCD or other type of image scanner to generate an accurate gray-scale response, the lampshading (cosine) effect in the CCD direction (X-direction) and the time-varying, lamp illumination effect in the time direction (Y-direction) will cause video amplitude variations as high as 30 to 50%.