Modulation transfer function assessment for sampled imaging system: application of the generalized line spread function to a widespread infrared camera

Mathieu Chambon; Jerome Primot; Michel Girard

doi:10.1117/12.210067

22 May 1995 Modulation transfer function assessment for sampled imaging system: application of the generalized line spread function to a widespread infrared camera

Mathieu Chambon, Jerome Primot, Michel Girard

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Proceedings Volume 2470, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing VI; (1995) https://doi.org/10.1117/12.210067
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

Abstract

The line spread function (LSF) is a classical figure of merit used to derive the modulation transfer function (MTF) of an imaging system. However this test cannot be directly applied to cameras based on an infrared focal plane array (IRFPA), as these sampled systems exhibit aliasing effects. ONERA has proposed a new technique called generalized line spread function allowing MTF assessment for sampled imaging systems. A testing of spatial frequency filtering becomes possible until at least twice the Nyquist frequency. The purpose of this paper is to show that this method is well-adapted to IRFPA cameras. In particular, the effects of bad a priori estimation of the characteristics of the camera are discussed. Secondly, we have carried on a laboratory experiment with a widespread infrared imaging system. The purpose is to demonstrate experimentally the advantages of this new method, not only in terms of performances but also in terms of simplicity of implementation and robustness. The infrared imaging system tested is a 512 by 512 Si:Pt IR5120C Mitsubishi camera equipped with a F/1.2 Angenieux lens.

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Mathieu Chambon, Jerome Primot, and Michel Girard "Modulation transfer function assessment for sampled imaging system: application of the generalized line spread function to a widespread infrared camera", Proc. SPIE 2470, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing VI, (22 May 1995); https://doi.org/10.1117/12.210067

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KEYWORDS

Modulation transfer functions

Imaging systems

Cameras

Spatial frequencies

Infrared cameras

Infrared imaging

Point spread functions

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