Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 383-391 |
| Number of pages | 9 |
| Journal | Optics Communications |
| Volume | 195 |
| Issue number | 5-6 |
| DOIs | |
| State | Published - 15 Aug 2001 |
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Rotationally invariant pattern recognition in a photorefractive joint transform correlator using circular harmonic filters and the wavelet transform. / Zhang, Hui; Cartwright, Colin M.; Ding, Mei-Song; Wang, Zhao-Qi; Liang, Bao-Lai; Gillespie, W. Allan.
In: Optics Communications, Vol. 195, No. 5-6, 15.08.2001, p. 383-391.Research output: Contribution to journal › Article
TY - JOUR
T1 - Rotationally invariant pattern recognition in a photorefractive joint transform correlator using circular harmonic filters and the wavelet transform
AU - Zhang,Hui
AU - Cartwright,Colin M.
AU - Ding,Mei-Song
AU - Wang,Zhao-Qi
AU - Liang,Bao-Lai
AU - Gillespie,W. Allan
PY - 2001/8/15
Y1 - 2001/8/15
N2 - A photorefractive joint transform correlator using circular harmonic filters and the wavelet transform for high discriminant and rotationally invariant pattern recognition is reported. In the experimental implementation, a photorefractive crystal, BSO, is used as the dynamic holographic medium and a bank of wavelet functions, derived from a mother Mexican-hat wavelet have been selected to achieve a band-pass operation in the Fourier domain. The zero-order and second-order circular harmonic components are used in the investigation. It is shown that, with the proper dilation factors, there is a trade-off between peak correlation intensity and signal-to-noise ratio (SNR) with the wavelet transform filters. With the second-order circular harmonic, an improvement of 63% in the SNR is achieved with only a 4% loss in the peak correlation intensity.
AB - A photorefractive joint transform correlator using circular harmonic filters and the wavelet transform for high discriminant and rotationally invariant pattern recognition is reported. In the experimental implementation, a photorefractive crystal, BSO, is used as the dynamic holographic medium and a bank of wavelet functions, derived from a mother Mexican-hat wavelet have been selected to achieve a band-pass operation in the Fourier domain. The zero-order and second-order circular harmonic components are used in the investigation. It is shown that, with the proper dilation factors, there is a trade-off between peak correlation intensity and signal-to-noise ratio (SNR) with the wavelet transform filters. With the second-order circular harmonic, an improvement of 63% in the SNR is achieved with only a 4% loss in the peak correlation intensity.
U2 - 10.1016/S0030-4018(01)01313-X
DO - 10.1016/S0030-4018(01)01313-X
M3 - Article
VL - 195
SP - 383
EP - 391
JO - Optics Communications
T2 - Optics Communications
JF - Optics Communications
SN - 0030-4018
IS - 5-6
ER -