Comparison of Fourier transform methods for calculating MTF

Joseph D. LaVeigne; Stephen D. Burks; Brian Nehring

doi:10.1117/12.780653

15 April 2008 Comparison of Fourier transform methods for calculating MTF

Joseph D. LaVeigne, Stephen D. Burks, Brian Nehring

Proceedings Volume 6941, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XIX; 69410Y (2008) https://doi.org/10.1117/12.780653
Event: SPIE Defense and Security Symposium, 2008, Orlando, Florida, United States

Abstract

Fourier transform methods common in infrared spectroscopy were applied to the problem of calculating the modulation transfer function (MTF) from a system's measured line spread function (LSF). Algorithms, including apodization and phase correction, are discussed in their application to remove unwanted noise from the higher frequency portion of the MTF curve. In general, these methods were found to significantly improve the calculated MTF. Apodization reduces the proportion of noise by discarding areas of the LSF where there is no appreciable signal. Phase correction significantly reduces the rectification of noise that occurs when the MTF is calculated by taking the power spectrum of the complex optical transfer function (OTF).

Citation Download Citation

Joseph D. LaVeigne, Stephen D. Burks, and Brian Nehring "Comparison of Fourier transform methods for calculating MTF", Proc. SPIE 6941, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XIX, 69410Y (15 April 2008); https://doi.org/10.1117/12.780653

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