基于压缩传感的太赫兹成像  

Terahertz imaging based on compressed sensing

作　　者：李泽[1,3] 王民钢[2] 刘小华[1] 赵跃进[1] 张存林[3] 

机构地区：[1]北京理工大学光电学院,北京100081 [2]西北工业大学航天学院,陕西西安710072 [3]首都师范大学物理系太赫兹光电子学教育部重点实验室,太赫兹波谱与成像北京市重点实验室,北京100048

出　　处：《红外与激光工程》2013年第6期1523-1527,共5页Infrared and Laser Engineering

基　　金：国家973计划(2007CB310408);国家自然科学基金(11004140、60977009);北京市教育委员会科技面上项目(11224010011)

摘　　要：介绍了一种基于压缩传感理论的THz成像方式,该理论突破了传统奈奎斯特采样定律的限制,可以以远小于图像总像素数的少量测量值来恢复出原始图像,从而很大程度上缩短了成像时间、提高了内存资源的利用率。通过对该理论的分析可知,变换基、测量矩阵和重构算法是该理论的三个重要因素,通过一系列仿真试验,分别对不同的变换基、测量矩阵和重构算法作了对比,根据对比结果,得到了最适合于文中被成像物体的变换基、测量矩阵以及重构算法。最后,利用离轴抛面镜代替聚乙烯透镜搭建了成像系统,得到了初步的试验结果。A THz imaging system based on the theory of compressed sensing was described, the theory break through the limit of Nyquist sampling law, it can reconstruct the original image by only a small number of measurements, so that it can shorten the imaging time and improve the utilization of memory resources to a large extend. Through the analysis of the theory, the three important factor of the theory are the transform matrix, the measurement matrix, and the reconstruction algorithm. A series of simulation was done to contrast different transform matrixes, different measurement matrixes and different reconstruction algorithms respectively, and according to contrast results, the most suitable transform matrix, measurement matrix and reconstruction algorithm for the image object were decided. Finally, the imaging system was set up by off-axis throw lens instead of polyethylene lens, and preliminary experimental results were made by this experiment system.

关 键 词：压缩传感 THZ 变换基 测量矩阵 重构算法 

分 类 号：O436[机械工程—光学工程]