High spatial resolution hyperspectral camera based on a linear variable filter

Ingmar G. E. Renhorn; David Bergström; Julia Hedborg; Dietmar Letalick; Sebastian Möller

doi:10.1117/1.OE.55.11.114105

17 November 2016 High spatial resolution hyperspectral camera based on a linear variable filter

Ingmar G. E. Renhorn, David Bergström, Julia Hedborg, Dietmar Letalick, Sebastian Möller

Author Affiliations +

Optical Engineering, Vol. 55, Issue 11, 114105 (November 2016). https://doi.org/10.1117/1.OE.55.11.114105

Abstract

A small, lightweight, and inexpensive hyperspectral camera based on a linear variable filter close to the focal plane array (FPA) is described. The use of a full-frame sensor allows large coverage with high spatial resolution at moderate spectral resolution. The spatial resolution has been maintained using a tilt/shift lens for chromatic focusing corrections. The trade-offs of positioning the filter relative to the FPA and varying the f-number have been studied. Calibration can correct for artifacts such as spectral filter variability. Reference spectra can be obtained using the same camera system by imaging targets over homogeneous areas. For textured surfaces, the different materials can be separated by using statistical methods. Accurate reconstruction of the sparse spectral image data is demonstrated.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Ingmar G. E. Renhorn, David Bergström, Julia Hedborg, Dietmar Letalick, and Sebastian Möller "High spatial resolution hyperspectral camera based on a linear variable filter," Optical Engineering 55(11), 114105 (17 November 2016). https://doi.org/10.1117/1.OE.55.11.114105

Published: 17 November 2016

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Cited by 39 scholarly publications and 2 patents.

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KEYWORDS

Optical filters

Cameras

Staring arrays

Spatial resolution

Linear filtering

Calibration

Sensors

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