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    Simplified measurement of point spread functions of hyperspectral cameras for assessment of spatial coregistration

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    1735471.pdf (444.4Kb)
    Date
    2019-05-14
    Author
    Skauli, Torbjørn
    Torkildsen, Hans Erling
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    Abstract
    In multi- and hyperspectral imaging, spatial coregistration of the point spread functions (PSFs) of all bands within each pixel is critical for the integrity of measured spectra. There is a need to define a standardized method for characterizing coregistration error. We propose a method that estimates PSFs from the product of line spread functions (LSFs) recorded in two orthogonal directions. Coregistration is then evaluated according to the PSF difference metric [T. Skauli, Opt. Expr. vol. 20, p. 918 (2012)]. Experimental results on two pushbroom hyperspectral cameras show good correspondence with measurements based on the full PSF, provided that LSF scan directions are aligned with axes of symmetry in the optics. Even a maximally unfavourable choice of scan directions gives meaningful estimates of coregistration error. The proposed method may have potential as a standard for coregistration characterization
    URI
    http://hdl.handle.net/20.500.12242/2644
    DOI
    10.1117/12.2520219
    Description
    Skauli, Torbjørn; Torkildsen, Hans Erling. Simplified measurement of point spread functions of hyperspectral cameras for assessment of spatial coregistration. Proceedings of SPIE, the International Society for Optical Engineering 2019 ;Volum 10986. FFI
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