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23 March 1995 Direction-dependent tangent: a new tangent representation
Wai-Him Wong, Horace H. S. Ip
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Proceedings Volume 2421, Image and Video Processing III; (1995) https://doi.org/10.1117/12.205481
Event: IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology, 1995, San Jose, CA, United States
Abstract
Many techniques in machine vision require tangent estimation. In many implementations, the acquired tangent estimates are sensitive to coding direction of the curves in interest. Therefore, it is a common practice to enforce a certain coding scheme, for example, a boundary is traced in the counterclockwise manner. However, this scheme guarantees to work only for closed curves. For open curves, an inverse operator seems to be a must. In this paper, we propose a new tangent representation scheme named direction-dependent tangent (DDT). DDT makes explicit the direction of curve following and incorporates concavity information into the tangent orientation. The scheme is a simple but powerful enhancement to the standard tangent notation. It facilitates shape matching type of tasks by removing the need for either a predefined coding direction or an inverse operator.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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Wai-Him Wong and Horace H. S. Ip "Direction-dependent tangent: a new tangent representation", Proc. SPIE 2421, Image and Video Processing III, (23 March 1995); https://doi.org/10.1117/12.205481
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KEYWORDS
Machine vision
Computer science
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