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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 15 — May. 20, 2010
  • pp: 2813–2818

Geometric calibration of a hyperspectral imaging system

Žiga Špiclin, Jaka Katrašnik, Miran Bürmen, Franjo Pernuš, and Boštjan Likar  »View Author Affiliations


Applied Optics, Vol. 49, Issue 15, pp. 2813-2818 (2010)
http://dx.doi.org/10.1364/AO.49.002813


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Abstract

Every imaging system requires a geometric calibration to yield accurate optical measurements. Geometric calibration typically involves imaging of a known calibration object and finding the parameters of a camera model and a model of optical aberrations. Optical aberrations can vary significantly across the wide spectral ranges of hyperspectral imaging systems, which can lead to inaccurate geometric calibrations if conventional methods were used. We propose a method based on a B-spline transformation field to align the spectral images of the calibration object to the model image of the calibration object. The degree of spatial alignment between the ideal and the spectral images is measured by normalized cross correlation. Geometric calibration was performed on a hyperspectral imaging system based on an acousto-optic tunable filter designed for the near-infrared spectral range ( 1.0 1.7 μm ). The proposed method can accurately characterize wavelength dependent optical aberrations and produce transformations for efficient subpixel geometric calibration.

© 2010 Optical Society of America

OCIS Codes
(080.1010) Geometric optics : Aberrations (global)
(100.2980) Image processing : Image enhancement
(150.1488) Machine vision : Calibration
(110.4234) Imaging systems : Multispectral and hyperspectral imaging

ToC Category:
Imaging Systems

History
Original Manuscript: February 17, 2010
Revised Manuscript: April 21, 2010
Manuscript Accepted: April 23, 2010
Published: May 13, 2010

Citation
Žiga Špiclin, Jaka Katrašnik, Miran Bürmen, Franjo Pernuš, and Boštjan Likar, "Geometric calibration of a hyperspectral imaging system," Appl. Opt. 49, 2813-2818 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-15-2813


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