Paper
18 January 2010 Multidirectional MTF measurement of digital image acquisition devices using a Siemens star
Kenichiro Masaoka, Masayuki Sugawara, Yuji Nojiri
Author Affiliations +
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.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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
Lens.org Logo
CITATIONS
Cited by 4 scholarly publications.
Advertisement
Advertisement
RIGHTS & PERMISSIONS
Get copyright permission  Get copyright permission on Copyright Marketplace
KEYWORDS
Modulation transfer functions

Stars

Modulation

Digital imaging

Spatial frequencies

Edge detection

Target detection

RELATED CONTENT

MTF evaluation of white pixel sensors
Proceedings of SPIE (February 08 2015)
Understanding system trades: a tutorial
Proceedings of SPIE (May 03 2017)
Easy focusing with a sweep frequency target
Proceedings of SPIE (October 01 1990)
Noise reduction versus spatial resolution
Proceedings of SPIE (March 03 2008)

Back to Top