Liquid crystal polarization-converting devices for edge and corner extractions of images using optical wavelet transforms

Michinori Honma; Toshiaki Nose; Susumu Sato

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Liquid crystal polarization-converting devices for edge and corner extractions of images using optical wavelet transforms

机译：液晶偏振转换装置，用于利用光学小波变换提取图像的边缘和角落

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Optical properties of radially polarized light generated by liquid crystal (LC) polarization-converting devices with two LC molecular orientations (+-180 deg and +-90 deg twist modes) are measured and the applicability to optical wavelet transforms (WTs) are discussed. It is found that the radially polarized lights in both the +-180 deg and +-90 deg twist modes can be regarded as wavelets. Based on the principle of WT, feature extractions of a simple binary image are carried out by applying the LC polarization-converting device to a shadow-casting system. Unique feature extraction properties of the shadow-casting system using the LC polarization-converting device and a LC microlens array are discussed. It is experimentally confirmed that edge and corner features are successfully extracted using the LC polarization-converting device with +-180 deg and +-90 deg twist modes, respectively.

机译：测量了具有两个LC分子取向（+ -180度和+ -90度扭曲模式）的液晶（LC）偏振转换设备产生的径向偏振光的光学特性，并讨论了其对光学小波变换（WTs）的适用性。发现在+ -180度和+ -90度扭曲模式下的径向偏振光都可以看作是小波。基于WT原理，通过将LC偏振转换装置应用于阴影投射系统，可以对简单的二值图像进行特征提取。讨论了使用LC偏振转换设备和LC微透镜阵列的投影系统的独特特征提取特性。实验证明，使用具有+ -180度和+ -90度扭曲模式的LC偏振转换设备可以成功提取边缘和拐角特征。

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来源
《Applied Optics》 |2006年第13期|p.3083-3090|共8页
作者
Michinori Honma; Toshiaki Nose; Susumu Sato;
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Department of Electronics and Information Systems, Akita Prefectural University, 84-4 Tsuchiya-Ebinokuchi, Honjo, Akita 015-0055, Japan;

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正文语种 eng
中图分类计量学;
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1. Liquid crystal polarization-converting devices for edge and corner extractions of images using optical wavelet transforms [J] . Michinori Honma, Toshiaki Nose, Susumu Sato Applied optics . 2006,第13期

机译：液晶偏振转换装置，利用光学小波变换提取图像的边缘和角落
2. REAL-TIME OPTICAL IMAGE SUBTRACTION AND EDGE ENHANCEMENT USING FERROELECTRIC LIQUID-CRYSTAL DEVICES BASED ON SPECKLE MODULATION [J] . Lin X., Takemori T., Ohtsubo J. Applied optics . 1996,第17期

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3. Method of Edge Extraction Based on Wavelet Transform for the Image of Mechanical Engineering Drawings [J] . WU Lin-rui, CHEN Jiong-bai, YUAN Zeng-feng Journal of Beijing Institute of Technology . 2000,第3期

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4. Feature Extraction Properties in Optical Wavelet Transforms Using Liquid Crystal Polarization-Converting Devices [C] . Michinori Honma, Toshiaki Nose, Susumu Sato International conference on nonlinear optics of liquid and photorefractive crystals . 2001

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Liquid crystal polarization-converting devices for edge and corner extractions of images using optical wavelet transforms

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