@inproceedings{0f1d847042a6434b9135d207891cc46c,

title = "Direct computation of qualitative 3D shape and motion invariants",

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.",

author = "Daphna Weinshall",

year = "1990",

language = "American English",

isbn = "0818620579",

series = "Proc 3 Int Conf Comput Vision",

publisher = "Publ by IEEE",

pages = "230--237",

booktitle = "Proc 3 Int Conf Comput Vision",

note = "Proceedings 3rd International Conference on Computer Vision ; Conference date: 04-12-1990 Through 07-12-1990",

}