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<p><b>Abstract</b>—Ridges and valleys are useful geometric features for image analysis. Different characterizations have been proposed to formalize the intuitive notion of ridge/valley. In this paper, we review their principal characterizations and propose a new one. Subsequently, we evaluate these characterizations with respect to a list of desirable properties and their purpose in the context of representative image analysis tasks.</p>
Creases, separatrices, drainage patterns, comparative analysis.

F. Lumbreras, J. Serrat, J. J. Villanueva and A. M. López, "Evaluation of Methods for Ridge and Valley Detection," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 21, no. , pp. 327-335, 1999.
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