Author :
Savarese, Silvio ; Rushmeier, Holly ; Bernardini, Fausto ; Perona, Pietro
Author_Institution :
California Inst. of Technol., Pasadena, CA, USA
Abstract :
The shape of an object may be estimated by observing the shadows on its surface. We present a method that is robust with respect to a conservative classification of shadow regions. Assuming that a conservative estimate of the object shape is available, we analyze images of the object illuminated with known point light sources taken from known camera locations. We adjust our surface estimate using the shadow regions to produce a refinement that is still a conservative estimate. A proof of correctness is provided. No assumptions about the object topology are made, although any tangent plane discontinuities over the object´s surface are supposed to be detectable. An implementation and some experimental results are presented
Keywords :
image classification; image processing; camera locations; classification; point light sources; shadow carving; shadow regions; surface estimate; Cameras; Image analysis; Light sources; Object detection; Optical collimators; Pixel; Robustness; Shape; Surface texture; Topology;
Conference_Titel :
Computer Vision, 2001. ICCV 2001. Proceedings. Eighth IEEE International Conference on
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7695-1143-0
DOI :
10.1109/ICCV.2001.937517
