NDLI: Lightdrum: surface reflectance measurement on site

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Lightdrum: surface reflectance measurement on site

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Lightdrum: surface reflectance measurement on site

Content Provider	ACM Digital Library
Author	Bittner, Jiří Hošek, Jan Čáp, Jiří Havran, Vlastimil Němcová, Šárka
Abstract	We present a portable instrument for on site measuring of surface reflectance represented by the bidirectional texture function (BTF) and the bidirectional reflectance distribution function (BRDF). Our device allows for measurement application scenarios outside the laboratory without the necessity to extract the measured sample from its environment because the instrument is taken to the measured sample. The concept is a rotational lightweight light stage with a compact hemispherical dome and cameras along the meridian and light emitting diode (LED) modules illuminating the sample surface. The LED modules are fixed on the hemisphere and the six cameras can move along the arc in the range of the elevation angle from 0 to 75 degrees. By rotating the hemispherical dome along its axis we can set all possible camera directions to a measured sample. We use an auto-collimator to adjust the correct perpendicular direction of the instrument against the sample. The proposed instrument is portable and fast while maintaining a high degree of accuracy achieving a quality similar to existing stationary BTF gantries that can be only used in a laboratory. The instrument design provides a good tradeoff between the accuracy of measurements and the practical applicability for measurement of locally flat samples. The instrument provides approximately 1000 HDR photographs in a minute that are necessary to capture spatially varying surface reflectance.
Starting Page	1
Ending Page	2
Page Count	2
File Format	PDF
ISBN	9781450350150
DOI	10.1145/3102163.3102234
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2017-07-30
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Bidirectional texture function Surface reflectance Surface reflectance measurement
Content Type	Text
Resource Type	Article

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