Measurement and analysis of the point spread function with regard to straylight correction

Julian Achatzi; Gregor Fischer; Volker Zimmer; Dietrich Paulus; Gerhard Bonnet

doi:10.1117/12.2078333

27 February 2015 Measurement and analysis of the point spread function with regard to straylight correction

Julian Achatzi, Gregor Fischer, Volker Zimmer, Dietrich Paulus, Gerhard Bonnet

Proceedings Volume 9404, Digital Photography XI; 940406 (2015) https://doi.org/10.1117/12.2078333
Event: SPIE/IS&T Electronic Imaging, 2015, San Francisco, California, United States

Abstract

Stray light is the part of an image that is formed by misdirected light. I.e. an ideal optic would map a point of the scene onto a point of the image. With real optics however, some parts of the light get misdirected. This is due to effects like scattering at edges, Fresnel reflections at optical surfaces, scattering at parts of the housing, scattering from dust and imperfections – on and inside of the lenses – and further reasons. These effects lead to errors in colour-measurements using spectral radiometers and other systems like scanners. Stray light is further limiting the dynamic range that can be achieved with High-Dynamic-Range-Technologies (HDR) and can lead to the rejection of cameras due to quality considerations. Therefore it is of interest, to measure, quantify and correct these effects. Our work aims at measuring the stray light point spread function (stray light PSF) of a system which is composed of a lens and an imaging sensor. In this paper we present a framework for the evaluation of PSF-models which can be used for the correction of straylight. We investigate if and how our evaluation framework can point out errors of these models and how these errors influence straylight correction.

Citation Download Citation

Julian Achatzi, Gregor Fischer, Volker Zimmer, Dietrich Paulus, and Gerhard Bonnet "Measurement and analysis of the point spread function with regard to straylight correction", Proc. SPIE 9404, Digital Photography XI, 940406 (27 February 2015); https://doi.org/10.1117/12.2078333

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