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RESEARCH PRODUCT
Real And Positive Filter Based On Circular Harmonic Expansion
Carlos FerreiraEnrique TajahuerceJavier Garciasubject
business.industryMathematical analysisReal-valued functionFilter (video)Optical correlatorPattern recognition (psychology)HarmonicComputer visionArtificial intelligenceOptical filterbusinessRotation (mathematics)Linear filterMathematicsdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1989-10-25 | SPIE Proceedings |