Sensors 2017, 17(3), 423; https://doi.org/10.3390/s17030423
Lightdrum—Portable Light Stage for Accurate BTF Measurement on Site
1
Faculty of Electrical Engineering, Czech Technical University, Karlovo nám. 13, 121 35 Praha 2, Czech Republic
2
Faculty of Mechanical Engineering, Czech Technical University, Technická 2, 166 07 Praha 6, Czech Republic
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 2 December 2016 / Revised: 11 February 2017 / Accepted: 11 February 2017 / Published: 23 February 2017
(This article belongs to the Section Physical Sensors)
Abstract
We propose a miniaturised light stage for measuring the bidirectional reflectance distribution function (BRDF) and the bidirectional texture function (BTF) of surfaces on site in real world application scenarios. The main principle of our lightweight BTF acquisition gantry is a compact hemispherical skeleton with cameras along the meridian and with light emitting diode (LED) modules shining light onto a sample surface. The proposed device is portable and achieves a high speed of measurement while maintaining high degree of accuracy. While the positions of the LEDs are fixed on the hemisphere, the cameras allow us to cover the range of the zenith angle from 0
Figure 1
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Supplementary material
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Externally hosted supplementary file 1
Link: http://dcgi.fel.cvut.cz/projects/lightdrum/
Description: Videos and data for Lightdrum project
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MDPI and ACS Style
Havran, V.; Hošek, J.; Němcová, Š.; Čáp, J.; Bittner, J. Lightdrum—Portable Light Stage for Accurate BTF Measurement on Site. Sensors 2017, 17, 423.
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