迭代重建光学传递函数测量法中多幅图像的相对平移校准  

Relative Translation Calibration of Multi-Frame Images in Iterative Reconstruction Method for Optical Transfer Function Measurement

作　　者：浦东 刘诚[1,2] 陶华[1,2] 戈亚萍 朱健强[1,2] Pu Dong;Liu Cheng;Tao Hua;Ge Yaping;Zhu Jianqiang(Joint Laboratory on High Power Laser and Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Joint Laboratory on High Power Laser and Physics,China Academy of Engineering Physics,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Science,Beijing 100049,China)

机构地区：[1]中国科学院上海光学精密机械研究所高功率激光物理联合实验室,上海201800 [2]中国科学院中国工程物理研究院高功率激光物理联合实验室,上海201800 [3]中国科学院大学材料与光电研究中心,北京100049

出　　处：《光学学报》2022年第19期58-64,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61827816,11875308,61905261);上海市“科技创新行动计划”项目(19142202600);中国科学院科研仪器设备研制项目(YJKYYQ20180024);中国科学院战略性先导科技专项(A类)项目(XDA25020306);中国科学院国际合作局对外合作重点项目(181231KYSB20170022)。

摘　　要：在迭代重建光学传递函数(OTF)测量法中,采集了多幅图像并进行更新计算,因而其具有抗噪声鲁棒性强和抗混叠等优点。然而,在图像采集过程中,不可避免的振动会引起多幅图像之间存在微小的相对平移,进而导致迭代计算次数增加和调制传递函数(MTF)测量结果准确性下降。该测量方法采集到的图像为随机排布的多个点扩散函数(PSF),多幅图像之间无法应用相位相关法来计算相对平移。鉴于此,提出了一种基于相位传递函数(PTF)的多幅图像相对平移校准方法。将每一幅图像单次计算的PTF分别减去第一幅图像单次计算的PTF,根据该差值校准多幅图像之间的相对平移。数值仿真和实验研究结果表明,所提方法的计算精度与图像相对平移的大小无关,至多能够将迭代次数减少80%,并将MTF测量的均方误差降低1~2个数量级。In the iterative reconstruction method for optical transfer function(OTF)measurement,several images are captured and taken into update computation,which offers this method strong anti-noise robustness and anti-aliasing.However,in image acquisition,the inevitable vibration will cause a small relative translation between multi-frame images,which results in an increase in the number of iterations and a decrease in the measurement accuracy of the modulation transfer function(MTF).Moreover,the images captured by this method are randomly distributed point spread functions(PSFs),and the relative translation between multi-frame images cannot be calculated by the phase correlation method.In view of this,a calibration method for relative translation between multi-frame images is proposed,which is based on the phase transfer function(PTF).The PTF calculated by a single iteration of the first image is subtracted from the PTF calculated by a single iteration of each image,and the relative translation between multi-frame images is calibrated according to the difference.The numerical simulation and experimental results reveal that the calculation accuracy of the proposed method is independent of the relative translation between images,and the proposed method can reduce the number of iterations by up to 80%and the mean square error of MTF measurement by one to two orders of magnitude.

关 键 词：测量 光学传递函数 调制传递函数 相位传递函数 相位相关法 光学测量 

分 类 号：TH741[机械工程—光学工程]