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Abstract
Dreschler and Nagel ( Comput. Graphics Image Process . 20 , 1982, 199–228) and Westphal and Nagel ( Comput. Vision Graphics Image Process . 34 , 1986, 302–320) describe a system, which derives polyhedral object descriptions of moving rigid objects from monocular image sequences. In order to explore the possibilities to improve such a non-convex polyhedral object description into one with curved surface patches, the systematic gray value variations in a series of corresponding locations within the images of a moving object are investigated. Conditions are stated for a non-linear approach which estimates the local surface normal and albedo. It is proven that the constraints induced by the temporal gray value variations are not sufficient in real outdoor scenes.
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