Shift, fully rotational, and limited-size-invariant pattern recognition using a circular harmonic matched filter

Sha-Wei Wang; Hon-Fai Yau; OuYang Yueh; Hsiao-Yi Lee

doi:10.1117/12.131215

30 October 1992 Shift, fully rotational, and limited-size-invariant pattern recognition using a circular harmonic matched filter

Sha-Wei Wang, Hon-Fai Yau, OuYang Yueh, Hsiao-Yi Lee

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Proceedings Volume 1812, Optical Computing and Neural Networks; (1992) https://doi.org/10.1117/12.131215
Event: International Symposium on Optoelectronics in Computers, Communications, and Control, 1992, Hsinchu, Taiwan

Abstract

A simple way to synthesize a shift, fully rotational and limited size invariant composite matched spatial filter for a coherent optical correlator is proposed. We use circular harmonic components of the same order of a reference pattern in different sizes as the training images instead of using the whole reference pattern in different orientations and different sizes as is reported by other workers. This saves much labor and time in the synthesis of the filter. In this article, we have synthesized a simple filter containing four second order circular harmonic components of the alphabetic letter `E' in four relative sizes 1, 1.17, 1.33, and 1.5. Results of computer simulation have shown that this filter is shift, fully rotational and limited size invariant over the size range from 1 to 1.5. Computer simulation has also shown that this filter possesses discriminating ability.

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Sha-Wei Wang, Hon-Fai Yau, OuYang Yueh, and Hsiao-Yi Lee "Shift, fully rotational, and limited-size-invariant pattern recognition using a circular harmonic matched filter", Proc. SPIE 1812, Optical Computing and Neural Networks, (30 October 1992); https://doi.org/10.1117/12.131215

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KEYWORDS

Optical correlators

Computer simulations

Neural networks

Optical computing

Optical filters

Optical pattern recognition

Pattern recognition

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