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Evaluating an image-based bidirectional reflectance distribution function measurement setup

Sole, Aditya Suneel; Farup, Ivar; Nussbaum, Peter; Tominaga, Shoji
Journal article, Peer reviewed
Accepted version
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URI
http://hdl.handle.net/11250/2494951
Date
2018
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  • Institutt for datateknologi og informatikk [4887]
  • Publikasjoner fra CRIStin - NTNU [26593]
Original version
Applied Optics. 2018, 57 (8), 1918-1928.   https://doi.org/10.1364/AO.57.001918
Abstract
We evaluate an image-based multiangle bidirectional reflectance distribution function measurement setup by comparing it to measurements from two commercially available goniospectrophotometers. The image-based setup uses an RGB camera to perform bidirectional measurements of the sample material. We use a conversion matrix to calculate luminance from the captured data. The matrix is calculated using camera spectral sensitivities that are measured with a monochromator. Radiance factor of the sample material is measured using a commercially available tabletop goniospectrophotometer and compared to measurements made using the image-based setup in the colorimetric domain. Our measurement setup is validated by comparing the measurements performed using a goniospectrophotometer. Uncertainty and error propagation is calculated and taken into account for validation. The sample material measured is wax-based ink printed on packaging paper substrate commonly used in the print and packaging industry. Results obtained show that the image-based setup can perform bidirectional reflectance measurements with a known uncertainty. The goniospectrophotometer measurements lie within the uncertainty of the measurements performed by the image-based measurement setup. The setup can be used to perform bidirectional reflectance measurements on samples with properties similar to the samples used in this paper.
Publisher
Optical Society of America
Journal
Applied Optics

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