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Proceedings Paper

Optical Fourier Convolver For Image Display Of Wedge-Ring Discrimination Features
Author(s): David Clark; Paul Czerner
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Paper Abstract

A wedge-ring Fourier feature extractor is enhanced with Fourier plane intensity spatial filtering to provide image-domain, discrimination feature displays. A brief review is given of the optical Fourier feature extractor architecture and its practical industrial inspection applications. A previous limitation of Fourier feature extractors has been the lack of display to the end-user of discrimination features in the space- or image-domain. A solution is presented consisting of a specialized 16-wedge and 16-ring Fourier plane intensity filter set. From Fourier feature vector data produced by the feature extractor, Fisher discriminant ratios determine the Fourier plane spatial filters to be used. Thus a dynamic architecture with feedback is possible, allowing the end-user to adjust front-end video image acquisition and/or object presentation to maximize the Fourier feature space novelty of defects to be detected. Computer software generated spatially filtered images are presented. An approach for implementing dedicated hardware is suggested, utilizing optical Fourier plane multiplication to achieve real-time convolution.

Paper Details

Date Published: 12 October 1988
PDF: 16 pages
Proc. SPIE 0956, Piece Recognition and Image Processing, (12 October 1988); doi: 10.1117/12.947695
Show Author Affiliations
David Clark, Global Holonetics Corporation (United States)
Paul Czerner, Global Holonetics Corporation (United States)

Published in SPIE Proceedings Vol. 0956:
Piece Recognition and Image Processing
Wayne Wiitanen, Editor(s)

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