Abstract
We present an experimental realization of optical correlation for real-time rotational-invariance pattern recognition by means of a photorefractive joint transform correlator. Single and multiple circular harmonic components have been used to form correlation filters. The correlator operates with a liquid crystal television as the input images and a photorefractive crystal Bi12SiO20 (BSO) as the recording medium. Suitable pre-processing of the references at the object plane makes up for the lack of light transmission. The properties of circular harmonic phase-only filter and circular harmonic matched filter have been compared. Also the noise robustness of these filters has been tested by tracking an object against a non-overlapping noise background. Analysis and experimental results are presented.
Original language | English |
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Pages (from-to) | 129-136 |
Number of pages | 8 |
Journal | Optics Communications |
Volume | 173 |
Issue number | 1-6 |
DOIs | |
Publication status | Published - Jan 2000 |
Keywords
- Spatial filter
- Joint power spectrum
- BSO
- Harmonic expansion