Title :
Direct computation of qualitative 3D shape and motion invariants
Author :
Weinshall, Daphna
Author_Institution :
Center for Biol. Inf. Process., MIT, Cambridge, MA, USA
Abstract :
The author shows that the sign of the normal curvature in a given direction at a given point in the image can be computed from a simple difference of slopes of line-segments in one image. Using this result, local surface patches can be classified as convex, concave, parabolic (cylindrical), hyperbolic (saddle point) or planar. At the same time the translational component of the optical flow is obtained, from which the focus of expansion can be computed. In addition, the axes of principal curvature and the axes of zero curvature are obtained
Keywords :
computer vision; computerised picture processing; axes; concave; convex; cylindrical; hyperbolic; line-segments; local surface patches; normal curvature; optical flow; parabolic; planar; principal curvature; qualitative 3D motion invariants; qualitative 3D shape invariants; saddle point; slopes; translational component; zero curvature; Biology computing; Biomedical optical imaging; Focusing; Image motion analysis; Information processing; Navigation; Optical computing; Optical recording; Optical sensors; Shape;
Conference_Titel :
Computer Vision, 1990. Proceedings, Third International Conference on
Conference_Location :
Osaka
Print_ISBN :
0-8186-2057-9
DOI :
10.1109/ICCV.1990.139524
