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Proceedings Paper

Real And Positive Filter Based On Circular Harmonic Expansion
Author(s): Carlos Ferreira; Javier Garcia; Enrique Tajahuerce
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Paper Abstract

A real and positive filter for pattern recognition is presented. The filter, based on the circular harmonic (CH) expansion of a real function, is partially rotation invariant. As it is real and positive, the filter can be recorded on a transparency as an amplitude filter. Computer simulations of character recognition show a partial rotation invariance of about 40°. Optical experiments agree with these results and with acceptable discrimination between different characters. Nevertheless, due to experimental difficulties, the method is onerous for use in general pattern recognition problems.

Paper Details

Date Published: 25 October 1989
PDF: 8 pages
Proc. SPIE 1134, Optical Pattern Recognition II, (25 October 1989); doi: 10.1117/12.961630
Show Author Affiliations
Carlos Ferreira, Universitat de Valencia (Spain)
Javier Garcia, Universitat de Valencia (Spain)
Enrique Tajahuerce, Universitat de Valencia (Spain)

Published in SPIE Proceedings Vol. 1134:
Optical Pattern Recognition II

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