Multidirectional MTF measurement of digital image acquisition devices using a Siemens star

Kenichiro Masaoka; Masayuki Sugawara; Yuji Nojiri

doi:10.1117/12.838889

18 January 2010 Multidirectional MTF measurement of digital image acquisition devices using a Siemens star

Kenichiro Masaoka, Masayuki Sugawara, Yuji Nojiri

Proceedings Volume 7537, Digital Photography VI; 75370V (2010) https://doi.org/10.1117/12.838889
Event: IS&T/SPIE Electronic Imaging, 2010, San Jose, California, United States

Abstract

We propose a method for measuring the multidirectional modulation transfer function (MTF) of digital image acquisition devices using a Siemens star. There are two leading methods for measuring the MTF: the slanted-edge method and the modulated Siemens star method. The former measures the MTF in the horizontal or vertical spatial frequency based on the line spread function (LSF) derived from the edge profile of a slanted knife-edge image. The latter measures the multidirectional MTF using a pattern circumferentially modulated with continuous gray levels. Our method measures the multidirectional MTF using the multidirectional knife-edges of a Siemens star, which is a simple binary image consisting of radial spokes. The vertical edge of the Siemens star is slightly slanted so that the multidirectional edge profiles are obtained in super-resolution. A portion image consisting of the knife-edge is selected in each direction and rotated so that the knife-edge stands upright with a slight tilt. Along the edge slope detected by fitting a cumulative distribution function to the pixel levels, the pixels are projected onto the horizontal axis, forming the edge profile. The resulting multidirectional MTF computed from the edge profiles is in excellent agreement with that measured by the modulated Siemens star method.

Citation Download Citation

Kenichiro Masaoka, Masayuki Sugawara, and Yuji Nojiri "Multidirectional MTF measurement of digital image acquisition devices using a Siemens star", Proc. SPIE 7537, Digital Photography VI, 75370V (18 January 2010); https://doi.org/10.1117/12.838889

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