Improved precision of stereometric measurement of relief's surface by means of structured light enhanced photometric stereo method

0366935 - ÚTAM 2012 RIV CZ eng C - Conference Paper (international conference)
Valach, Jaroslav - Bryscejn, Jan
Improved precision of stereometric measurement of relief's surface by means of structured light enhanced photometric stereo method.
Experimentální analýza napětí 2011. Brno: Czech society for mechanics, 2011 - (Návrat, T.; Fuis, V.; Houfek, L.; Vlk, M.), s. 411-415. ISBN 978-80-214-4275-7.
[Experimentální analýza napětí 2011. Znojmo (CZ), 06.06.2011-09.06.2011]
R&D Projects: GA MK(CZ) DF11P01OVV001
Institutional research plan: CEZ:AV0Z20710524
Keywords : optical methods * strain measurement * photometry
Subject RIV: JB - Sensors, Measurment, Regulation

Photometry is an interesting method for 3D measurement of surfaces with relief. It utilizes a relationship between depth of shadow determined intensity of light and surface normal orientation towards source of light. Advantage of methods incorporating this principle is their independence on distance between measured object and the measuring apparatus and scalable sensitivity suitable for relatively flat surfaces. On the other hand, there is a drawback as the photometric methods yield results up to an unknown multiplicative factor. One way how to overcome this limitation is to simultaneously describe the measured surface by means of another optical method. Among the -candidates-, the structured light projection is the most promising one for a simple implementation. The presentation of the possibility to integrate these two methods in unified system is main topic of this contribution.
Permanent Link: http://hdl.handle.net/11104/0201757