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We present a discrete labeling scheme for line drawings of curved objects which can be seen as an information-rich extension of the classic line-labeling scheme in which lines are classified as convex, concave, occluding or extremal. New labels are introduced to distinguish between curved and planar surface-patches, to identify orthogonal edges and to indicate gradient directions of planar surface-patches.
scene analysis, shape, constraint satisfaction

M. Cooper, "A Rich Discrete Labeling Scheme for Line Drawings of Curved Objects," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 30, no. , pp. 741-745, 2007.
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