Optical edge detection with adjustable resolution based on liquid crystal polarization gratings  

作　　者：Yang Yang Xinyang Liu Yan Wu Ting Li Fan Fan Huihui Huang Shuangchun Wen 杨阳;刘新阳;吴艳;李婷;樊帆;黄晖辉;文双春(Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices,School of Physics and Electronics,Hunan University,Changsha 410082,China)

机构地区：[1]Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices,School of Physics and Electronics,Hunan University,Changsha 410082,China

出　　处：《Chinese Optics Letters》2020年第9期84-87,共4页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 61704053);the Natural Science Foundation of Hunan Province (No. 2017JJ3032);the Fundamental Research Funds for the Central Universities of China。

摘　　要：Optical edge detection, a part of image processing, plays an important role in extracting image information used in optical analog computation. In this Letter, we raise a new way to realize optical edge detection. This design is based on two liquid crystal polarization gratings with a period of 2.2 mm, which function as a spatial differentiator. We experimentally demonstrate broadband optical detection and real-time adjustable resolution.The proposed method takes advantage of the convenience to use, simple fabrication process, and real-time tunable resolution. It may guide more significant applications in the optical field and other practical scenarios like machine vision in computers.

关 键 词：liquid crystal polarization gratings optical edge detection 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]