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30 May 2001 Feature extraction properties in optical wavelet transforms using liquid crystal polarization-converting devices
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Proceedings Volume 4418, Eighth International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals; 44180L (2001) https://doi.org/10.1117/12.428306
Event: Eighth International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals, 2000, Alushta, Crimea, Ukraine
Abstract
Liquid crystal (LC) molecular orientations and optical properties of LC polarization-converting devices are discussed. It is found that two stable LC molecular orientation states appear (we define them at the +/- 90 degree(s) and +/- 180 degree(s) twist modes), and the switching method between the two modes are discussed. Fourier transforms (FT) of the transmitted light of the LC polarization- converting device are performed by computer simulations. It is confirmed from the simulated FT results that both distribution profiles of the transmitted light beams in the +/- 90 degree(s) and +/- 280 degree(s) twist modes can be regarded as wavelets. Wavelet transforms using the LC polarization- converting device are simulated and feature extraction properties are discussed. It is found that the +/- 90 degree(s) and +/- 180 degree(s) twist modes can perform corner and edge extractions, respectively.
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Michinori Honma, Toshiaki Nose, and Susumu Sato "Feature extraction properties in optical wavelet transforms using liquid crystal polarization-converting devices", Proc. SPIE 4418, Eighth International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals, 44180L (30 May 2001); https://doi.org/10.1117/12.428306
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