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液晶透镜无偏振片成像的优化算法

An Optimization Algorithm for Polarizer-Free Imaging of Liquid Crystal Lens

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摘要

液晶透镜因其无机械移动就可以实现对焦的优势,有望应用在机器人视觉、自动驾驶、深度测量等技术领域。在液晶透镜视觉成像系统中,为了不使用偏振片就可以获得高对比度的图像,提出一种优化的无偏振片成像算法。图像边缘体现图像的主要轮廓信息,边缘决定图像的对比度,所以此算法提取图像边缘,在边缘部分利用获取的非对焦图像和对焦图像进行图像处理,平滑区域不作处理,去除由非调制的寻常光带来的低频图像分量,提高图像边缘对比度,同时抑制平滑区域噪声的增加。实验证明,优化后的算法增强了图像边缘的对比度,相比于优化前的算法,图像噪声下降了50%。

Abstract

Owing to its ability of focus change not relying on any mechanical movements, liquid crystal lens is expected to be used in many fields such as robot vision, automatic pilot, and depth measurement. In the liquid crystal lens vision imaging system, in order to obtain high-contrast images without a polarizer, an optimization algorithm for polarizer-free imaging of liquid crystal lens is proposed. Image edge reflects the main contour information, and it decides the contrast of the image, so in the algorithm image edge is extracted first, then image processing is carried out with out-of-focus image and in-focus image in the edge parts, but not in the smooth area. Low frequency components caused by non-modulated ordinary wave are removed to improve image edge contrast and suppress noise in the smooth area. Experiments show that the optimized algorithm enhances the contrast of image edges, and the image noise is reduced by 50% compared with the algorithm before optimization.

Newport宣传-MKS新实验室计划
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中图分类号:TP391

DOI:10.3788/aos201838.0815015

所属栏目:“机器视觉检测与应用”专题

基金项目:四川省科技计划(2017JY0022)、中央高校基本科研业务费(ZYGX2016J076, ZYGX2010J063)

收稿日期:2018-04-02

修改稿日期:2018-04-27

网络出版日期:2018-05-08

作者单位    点击查看

白一晨:电子科技大学光电科学与工程学院, 四川 成都 610054
陈晓西:电子科技大学光电科学与工程学院, 四川 成都 610054
曾俊:微晶景泰科技有限公司, 四川 成都 610000
叶茂:电子科技大学光电科学与工程学院, 四川 成都 610054

联系人作者:叶茂(mao_ye@uestc.edu.cn)

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引用该论文

Bai Yichen,Chen Xiaoxi,Zeng Jun,Ye Mao. An Optimization Algorithm for Polarizer-Free Imaging of Liquid Crystal Lens[J]. Acta Optica Sinica, 2018, 38(8): 0815015

白一晨,陈晓西,曾俊,叶茂. 液晶透镜无偏振片成像的优化算法[J]. 光学学报, 2018, 38(8): 0815015

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