Title :
In Search of an Optimal Set of Images for Uncalibrated Photometric Stereo
Author :
Hernandez-Rodriguez, Francisco ; Castelan, M.
Author_Institution :
Grupo de Robot. y Manufactura Avanzada Carretera Saltillo-Monterrey, Centro de Investig. y de Estudios Av. del I.P.N., Coahuila
Abstract :
In this paper, we draw on the ideas of previous work done by Drbohlav and Chantler [5], where a theoretical study on the optimal lighting configuration for photometric stereo was developed. They demonstrated that the known n light source azimuth angles should be equally spaced over 360/n degrees and the n light source elevation angles should be constant. In this paper, our aim is to develop a method to find a set of images that best satisfies this lighting configuration, assuming that light source directions are unknown. To this end, we estimate lighting coefficients using a harmonic spherical illumination model and a reference surface. Once the set of light source directions is estimated, we select those images that best satisfy the optimal lighting configuration. Experiments on face datasets show that the selected images are the most suitable for the purposes of calculation of height maps through surface integration.
Keywords :
optimisation; stereo image processing; harmonic spherical illumination model; light source elevation angles; optimal image set; optimal lighting configuration; uncalibrated photometric stereo; Artificial intelligence; Azimuth; Cameras; Light sources; Lighting; Matrix decomposition; Photometry; Principal component analysis; Stereo vision; Surface reconstruction; Light source direction estimation; Photometric Stereo; Spherical Harmonics;
Conference_Titel :
Artificial Intelligence, 2008. MICAI '08. Seventh Mexican International Conference on
Conference_Location :
Atizapan de Zaragoza
Print_ISBN :
978-0-7695-3441-1
DOI :
10.1109/MICAI.2008.60