偏振通道的选择对红外偏振成像质量的影响

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Quality of infrared polarization imaging related to the selectionofpolarizationchannels

ZHANG Jiamin 1 ，MAO Weiyun1，XIAO Rong1， SI Wenrong1，BIAN Yunyi 2，3 HAO Jia 2，3 ， ZHOU Junzhuo23， YU Yiting2，

（1.State Grid Shanghai Electric Power Research Institute， Shanghai 200437;

2. Key Laboratory of Scale Manufacturing Technologies for High-Performance MEMS Chips of Zhejiang Prouince， Key Laboratory of Optical Microsystems and Application Techbnologies of Ningbo City，Ningbo Institute ofNorthwestern Polytechnical University，Ningbo 315103;

3. Key Laboratory of Micro/Nano Systems for Aerospace （Ministry ofEducation） ， Key Laboratory of Micro and Nano Electro-Mechanical Systems ofShaanxi Prooince， School ofMechanical Engineering， Northwestern Polytechnical University，Xi'an 71OO72， China） * Corresponding author， E -mail： yyt@nwpu. edu. cn

Abstract： In order to improve the accuracy and efciency of defect detection in power equipments，a timedivision infrared polarization imaging system is constructed，combining a long-wave infrared detector and a polarizer. For electric transmission lines，multi-channel image acquisition is realized by controling the polarizer rotation. Then，the polarization images with different channel numbers and diferent polarization angle intervals are evaluated using three parameters，i. e. root mean square error （RMSE），peak signal-tonoise ratio （PSNR） and mean structural similarity（MSSIM），respectively. The experimental results show that as the number of channels increases from 3 to 18，the imagequality is gradually improved，especiall in the range of 4 to 9 channels，where the improvement of imaging quality is most significant. However，further increasing the number of channels does not have a significant effect on the image quality， which leads to redundant calculations； for 3-channel polarization images，smallangular intervals are able to capture the detailed information of fine targets，while large angular intervals are able to effectively separate the target from the background and reduce the noise interference，which are both suitable for some specific application scenarios.The experimental results are instructive for the polarization channel selection strategy of infrared polarization imaging.

Key words： Power Inspection； Long-Wave Infrared （LWIR）； time-division infrared polarization imaging system；polarization channel;stokes vector

1引言

在目标探测领域，不同目标或者同一目标的不同位置表面，其红外辐射特性都会有较大的差异1，而红外检测和成像技术正是利用目标物体与背景之间红外辐射差值来获得目标信息的技术。（剩余10973字）