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Optical Engineering

Improved performance of scale-invariant pattern recognition using a combined Mellin radial harmonic function and wavelet transform
Author(s): Yih-Shyang Cheng; Hui Chi Chen
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Paper Abstract

By using a combination of the Mellin radial harmonic function and the Mexican-hat wavelet transform, scale- and shift-invariant pattern recognition is reported. Without preprocessing of the input object, this filter is capable of identifying over a wide allowable scale range of 0.25 to 1. The correlation peaks are sharp, and the peak intensity is fairly uniform, with a variance below 30%. Computer simulation is adopted to investigate the performance of the filter. Experimental results implemented using a photorefractive joint-transform correlator, including those obtained under white noise, are also presented.

Paper Details

Date Published: 1 October 2007
PDF: 8 pages
Opt. Eng. 46(10) 107204 doi: 10.1117/1.2799534
Published in: Optical Engineering Volume 46, Issue 10
Show Author Affiliations
Yih-Shyang Cheng, National Central Univ. (Taiwan)
Hui Chi Chen, Fu Jen Catholic Univ. (Taiwan)

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