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Hierarchical Shape Description Via the Multiresolution Symmetric Axis Transform

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3 Author(s)
Pizer, S.M. ; Department of Computer Science and the Department of Radiology, University of North Carolina, Chapel Hill, NC 27514. ; Oliver, William R. ; Bloomberg, S.H.

A method is proposed that produces a shape description in the form of a hierarchy by scale of simple symmetric axis sequences. An axis segment that is a child of another has smaller scale and is seen as a branch of its parent. The scale value and parent-child relationship are induced by following the symmetric axis under successive reduction of resolution. The result, in two or three dimensions, is a figure¿rather than boundary¿oriented shape description that has natural segments and is insensitive to noise in the object description. The general approach of hierarchy production by following a feature through successive resolution reduction will be presented, as will methods of resolution reduction and computer implementation. Also, the relation of this figure-based shape description to those based on boundary curvature will be briefly discussed.

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Pattern Analysis and Machine Intelligence, IEEE Transactions on  (Volume:PAMI-9 ,  Issue: 4 )