A rich discrete labeling scheme for line drawings of curved objects.

Cooper, Martin C · IEEE Trans Pattern Anal Mach Intell · 2008

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Abstract

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.

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