TY - GEN
T1 - Direct computation of qualitative 3D shape and motion invariants
AU - Weinshall, Daphna
PY - 1990
Y1 - 1990
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0025575652&partnerID=8YFLogxK
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AN - SCOPUS:0025575652
SN - 0818620579
T3 - Proc 3 Int Conf Comput Vision
SP - 230
EP - 237
BT - Proc 3 Int Conf Comput Vision
PB - Publ by IEEE
T2 - Proceedings 3rd International Conference on Computer Vision
Y2 - 4 December 1990 through 7 December 1990
ER -