An Efficient and elastic approach for partial shape matching using DTW

  ijett-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
  
© 2013 by IJETT Journal
Volume-4 Issue-4                       
Year of Publication : 2013
Authors : Snehali M. Khakse , Prof.V.K. Shandilya

MLA 

Snehali M. Khakse , V.K. Shandilya. "An Efficient and elastic approach for partial shape matching using DTW". International Journal of Engineering Trends and Technology (IJETT). V4(4):1117-1121 Apr 2013. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group.

Abstract

We present the Partial shape matching for scale invariant and deformation tolerant 2D images. S cale invariance means a feature of objects that do not change if scale or length of objects changes. Deformation tolerance means tolerating a change in the volume and/or shape of object. We propose to transform shapes into sequences and utilize an algorithm that determines a subsequence of a target sequence that best matches a query. The proposed scheme lies a novel shape descriptor that also permits the quantification of local scale. Shape descriptors are computed along open or closed contours in a spatially non - uniform manner. The resulting ordered collections of shape descriptors constitute the global shap e representation. A variant of an existing Dynamic Time Warping (DTW) matching technique is proposed to handle the matching of shape representations. Due to the properties of the employed shape descriptor, sampling scheme and matching procedure, the propo sed approach performs partial shape matching that is invariant to Euclidean transformations, starting point as well as to considerable shape deformations. Additionally, the problem of matching closed - to - closed contours is naturally treated as a special case. Algorithm outperforms the commonly used techniques in retrieval accuracy.

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Keywords
DTW(dynamic time warping technique), shape descriptor .