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.
© 2011 Chinese Optics Letters
(100.1830) Image processing : Deconvolution
(100.2000) Image processing : Digital image processing
(110.2960) Imaging systems : Image analysis
(110.4100) Imaging systems : Modulation transfer function
Tiecheng Li, Huajun Feng, and Zhihai Xu, "A new analytical edge spread function fitting model for modulation transfer function measurement," Chin. Opt. Lett. 9, 031101- (2011)