10 May 2012 Infrared projector optical system characterisation and its application to nonuniformity correction
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Abstract
A new enhanced resistor array projector nonuniformity correction (NUC) process based on the flood method is presented. It relies on precise characterisation of the projector-camera optical system. The information obtained from the characterisation procedure is used for the rapid derivation of NUC coefficients in a minimal number of iterations. The new NUC process benefits from using large format cameras but, in contrast to previous flood methods, it does not depend critically on 1:1 mapping and can be performed using smaller format cameras. Other benefits are improved handling of emitter array imperfections and sampling artefacts. The procedure is fast and alleviates camera temporal effects such as drift. In order to further isolate the correction process from temporal effects, we have implemented a new multi-point multi-temperature camera calibration procedure that allows the corrections to be applied in real time. We describe our procedure and discuss other possible NUC improvement strategies.
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Leszek Swierkowski, Robert A. Joyce, Chad L. Christie, "Infrared projector optical system characterisation and its application to nonuniformity correction", Proc. SPIE 8356, Technologies for Synthetic Environments: Hardware-in-the-Loop XVII, 83560M (10 May 2012); doi: 10.1117/12.919008; https://doi.org/10.1117/12.919008
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