A new analytical edge spread function fitting model for modulation transfer function measurement  

作　　者：李铁成 冯华君 徐之海 

机构地区：[1]State Key Laboratory of Modern Optical Instrumentation,Zhejiang University

出　　处：《Chinese Optics Letters》2011年第3期37-40,共4页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.60977010);the National Key Basic Research and Development Program of China (No.2009CB724006);the National High Technology Research and Development Program of China (No.2009AA12Z108);the Innovation Foundation of China Aerospace Science and Technology Corporation

摘　　要：We propose a new analytical edge spread function （ESF） fitting model to measure the modulation transfer function （MTF）.The ESF data obtained from a slanted-edge image are fitted to our model through the non-linear least squares （NLLSQ） method.The differentiation of the ESF yields the line spread function （LSF）,the Fourier transform of which gives the profile of two-dimensional MTF.Compared with the previous methods,the MTF estimate determined by our method conforms more closely to the reference.A practical application of our MTF measurement in degraded image restoration also validates the accuracy of our model.We propose a new analytical edge spread function （ESF） fitting model to measure the modulation transfer function （MTF）.The ESF data obtained from a slanted-edge image are fitted to our model through the non-linear least squares （NLLSQ） method.The differentiation of the ESF yields the line spread function （LSF）,the Fourier transform of which gives the profile of two-dimensional MTF.Compared with the previous methods,the MTF estimate determined by our method conforms more closely to the reference.A practical application of our MTF measurement in degraded image restoration also validates the accuracy of our model.

关 键 词：Fourier transforms Image reconstruction Least squares approximations Optical transfer function 

分 类 号：TB112[理学—数学]