Technical Reports

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UBC CS TR-97-10 Summary

Surface and Shading Models from Real Images fro Computer Graphics, August 01, 1997 Jiping Lu and Jim Little, 23 pages

Surface and Shading Models from Real images for Computer Graphics

Jiping Lu Jim Little little@cs.ubc.c Laboratory for Computational Intelligence Department of Computer Science The University of British Columbia Vancouver BC Canada V6T 1Z4

ABSTRACT In this technical report we present an object modeling and rendering technique from real images for computer graphics. The technique builds the surface geo- metric model and extracts the surface shading model from a real image sequence of a rotating object illuminated under a collinear light source (where the illuminant direction of the light source is the same as the viewing direction of the camera). In building the surface geometric model, the object surface reflectance function is extracted from the real images and used to recover the surface depth and orientation of the object. In building the surface shading model, the different shading components, the ambient component, the diffuse component and the specular component, are calculated from the surface reflec- tance function extracted from the real images. Then the obtained shading model is used to render the recovered geometric model of the surface in arbi- trary viewing and illuminant directions. Experiments have been conducted on diffuse surface and specular surface. The synthetic images of the recovered object surface rendered with the extracted shading model are compared with the real images of the same objects. The results shows that the technique is feasible and promising. Index terms: Computer vision, computer graphics, Surface recovery, Surface modeling, Surface reflectance, Shading function, Graphics rendering, Virtual reality.

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