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Multispectral camera as spatio-spectrophotometer under uncontrolled illumination

Khan, Haris Ahmad; Thomas, Jean-Baptiste; Hardeberg, Jon Yngve; Laligant, Olivier
Journal article, Peer reviewed
Published version
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URI
http://hdl.handle.net/11250/2586072
Date
2019
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  • Institutt for datateknologi og informatikk [3796]
  • Publikasjoner fra CRIStin - NTNU [19954]
Original version
https://doi.org/10.1364/OE.27.001051
Abstract
Multispectral constancy enables the illuminant invariant representation of multi-spectral data. This article proposes an experimental investigation of multispectral constancy through the use of multispectral camera as a spectrophotometer for the reconstruction of surface reflectance. Three images with varying illuminations are captured and the spectra of material surfaces is reconstructed. The acquired images are transformed into canonical representation through the use of diagonal transform and spectral adaptation transform. Experimental results show that use of multispectral constancy is beneficial for both filter-wheel and snapshot multi-spectral cameras. The proposed concept is robust to errors in illuminant estimation and is able to perform well with linear spectral reconstruction method. This work makes us one step closer to the use of multispectral imaging for computer vision.
Publisher
Optical Society of America
Journal
Optics Express

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