利用液晶投影仪动态照明实现单像素成像  

Single-Pixel Imaging by Dynamic Illumination of Liquid Crystal Projector

作　　者：张鹏[1] 周昕[1] 呼有军 孙阿茜 乐建明[1] 

机构地区：[1]四川大学电子信息学院,四川成都610065

出　　处：《光学与光电技术》2017年第1期24-28,共5页Optics & Optoelectronic Technology

基　　金：国家自然科学基金(61475104;61177009)资助项目

摘　　要：为了解决传统数据采集压缩利用率低的问题,提出了基于压缩感知原理的动态投影照明实现单像素成像的新方法,即采用普通液晶投影仪把随机测量图片动态投射到物体上,再用光电探测器响应和记录每次投影光透过待测物体后出射的总光强。然后应用正交匹配追踪算法对所记录的光强信号进行重建运算,还原出物体图像,并对压缩感知过程的不同采样率与分辨率的重建图像效果进行了实验比较。实验结果表明,在采样率为30%左右时,可以精确重建出原始图像。因此,这种动态投影的方法能够较好地实现单像素成像过程。In order to solve the problem of low utilization rate in traditional data compression,a new method of single-pixel imaging is proposed based on the theory of compressed sensing by dynamic projection illumination.An ordinary liquid crystal projector is used to project dynamically a series of random measurement pictures on the object,and a photoelectric detector is employed to response and record the total intensity of light passing through the object at each projection.Then,the algorithm of orthogonal matching pursuit is implemented for reconstruction operation on the recorded data of intensity signal to reconstruct the image of object.Meanwhile in experiments,the reconstructed images in different sampling rate and resolution during the process of compressed sensing are compared.Experimental results indicate that the image of object can be reconstructed precisely by single-pixel imaging using dynamic projection illumination when the sampling rate is about 30%.Therefore,such a dynamic projection method can achieve a better result of single pixel imaging process.

关 键 词：压缩感知 单像素成像 动态投影 正交匹配追踪 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]