Modified slanted-edge method and multidirectional modulation transfer function estimation

作     者：Masaoka, Kenichiro Yamashita, Takayuki Nishida, Yukihiro Sugawara, Masayuki 

作者机构：NHK Sci & Technol Res Labs Tokyo 1578510 Japan 

出 版 物：《OPTICS EXPRESS》 

年 卷 期：2014年第22卷第5期

页      面：6040-6046页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

主　　题：Digital imaging Discrete Fourier transforms Frequency measurement Image resolution Modulation techniques Modulation transfer function 

摘      要：The slanted-edge method specified in ISO Standard 12233, which measures the modulation transfer function (MTF) by analyzing an image of a slightly slanted knife-edge target, is not robust against noise because it takes the derivative of each data line in the edge-angle estimation. We propose here a modified method that estimates the edge angle by fitting a two-dimensional function to the image data. The method has a higher accuracy, precision, and robustness against noise than the ISO 12233 method and is applicable to any arbitrary pixel array, enabling a multidirectional MTF estimate in a single measurement of a starburst image. (C)2014 Optical Society of America