Optical Fourier Convolver For Image Display Of Wedge-Ring Discrimination Features

David Clark; Paul Czerner

doi:10.1117/12.947695

12 October 1988 Optical Fourier Convolver For Image Display Of Wedge-Ring Discrimination Features

David Clark, Paul Czerner

Proceedings Volume 0956, Piece Recognition and Image Processing; (1988) https://doi.org/10.1117/12.947695
Event: SPIE International Symposium on Optical Engineering and Industrial Sensing for Advance Manufacturing Technologies, 1988, Dearborn, MI, United States

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.

Citation Download Citation

David Clark and Paul Czerner "Optical Fourier Convolver For Image Display Of Wedge-Ring Discrimination Features", Proc. SPIE 0956, Piece Recognition and Image Processing, (12 October 1988); https://doi.org/10.1117/12.947695

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