Feature extraction properties in optical wavelet transforms using liquid crystal polarization-converting devices

Michinori Honma; Toshiaki Nose; Susumu Sato

doi:10.1117/12.428306

30 May 2001 Feature extraction properties in optical wavelet transforms using liquid crystal polarization-converting devices

Michinori Honma, Toshiaki Nose, Susumu Sato

Author Affiliations +

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.

Citation Download Citation

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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