Open AccessPractical edge-based modulation transfer function measurement
Author(s) -
Kenichiro Masaoka
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.001345
Subject(s) - subpixel rendering , optical transfer function , aliasing , optics , enhanced data rates for gsm evolution , pixel , modulation (music) , computer science , point spread function , image resolution , transfer function , spatial frequency , algorithm , physics , artificial intelligence , undersampling , acoustics , electrical engineering , engineering
The accuracy and precision of the modulation transfer function (MTF) of a sampled imaging system are affected by the shift-variant nature of subpixel binning of the pixel values in edge-based methods. This study demonstrates that a binning phase selected from a small number of binning phases can achieve a practical precision criterion for the MTF measurement. Furthermore, the new method proposed in this paper approximates the non-aliased, fundamental MTF without edge angle estimation and the following subpixel binning. The algorithm simply averages the aliased MTFs calculated from the row-by-row edge gradients in the region of a bitonal edge image and removes an assumed aliasing component. This method is also applicable to an oblique and non-straight edge.