Title :
Sources from shading
Author :
Yang, Yibing ; Yuille, Alan
Author_Institution :
Div. of Appl. Sci., Harvard Univ., Cambridge, MA, USA
Abstract :
The authors assume a Lambertian shading model with unknown light source directions. It is shown that information on the occluding boundary puts strong constraints on the light source directions. For a small number of light sources, from sufficiently different directions, additional information from intensity extrema will be sufficient to determine the source directions. If there are two, or three, views of the object then the light sources can be determined without extrema information. The authors report experiments performed on synthesized images
Keywords :
computer vision; Hough transforms; Lambertian shading model; intensity extrema; occluding boundary; synthesized images; unknown light source directions; Azimuth; Boundary conditions; Image converters; Iterative methods; Legged locomotion; Light sources; Reflectivity; Shape;
Conference_Titel :
Computer Vision and Pattern Recognition, 1991. Proceedings CVPR '91., IEEE Computer Society Conference on
Conference_Location :
Maui, HI
Print_ISBN :
0-8186-2148-6
DOI :
10.1109/CVPR.1991.139749
