Lightdrum-Portable Light Stage for Accurate BTF Measurement on Site

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F17%3A00312272" target="_blank" >RIV/68407700:21220/17:00312272 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21230/17:00312272

Result on the web

<a href="http://www.mdpi.com/1424-8220/17/3/423" target="_blank" >http://www.mdpi.com/1424-8220/17/3/423</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/s17030423" target="_blank" >10.3390/s17030423</a>

Result language

angličtina

Original language name

Lightdrum-Portable Light Stage for Accurate BTF Measurement on Site

Original language description

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 degrees to 75 degrees and by rotating the cameras along the axis of the hemisphere we can cover all possible camera directions. This allows us to take measurements with almost the same quality as existing stationary BTF gantries. Two degrees of freedom can be set arbitrarily for measurements and the other two degrees of freedom are fixed, which provides a tradeoff between accuracy of measurements and practical applicability. Assuming that a measured sample is locally flat and spatially accessible, we can set the correct perpendicular direction against the measured sample by means of an auto- collimator prior to measuring. Further, we have designed and used a marker sticker method to allow for the easy rectification and alignment of acquired images during data processing. We show the results of our approach by images rendered for 36 measured material samples.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10201 - Computer sciences, information science, bioinformathics (hardware development to be 2.2, social aspect to be 5.8)

Project

<a href="/en/project/GA14-19213S" target="_blank" >GA14-19213S: On-site acquisition, compression and rendering of spatially varying surface reflectances</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Sensors - Open Access Journal

ISSN

1424-8220

e-ISSN

1424-8220

Volume of the periodical

17

Issue of the periodical within the volume

3

Country of publishing house

CH - SWITZERLAND

Number of pages

57

Pages from-to

1-57

UT code for WoS article

000398818700001

EID of the result in the Scopus database

2-s2.0-85014224306