As the usage of 3D models increases, so does the importance of developing accurate 3D shape retrieval algorithms. A common approach is to calculate a shape descriptor for each object, which can then be compared to determine two objects similarity. However, these descriptors are often evaluated independently and on different datasets, making them difficult to compare. Using the SHREC 2011 Shape Retrieval Contest of Non-rigid 3D Watertight Meshes dataset, we systematically evaluate a collection of local shape descriptors. We apply each descriptor to the bag-of-words paradigm and assess the effects of varying the dictionarys size and the number of sample points. In addition, several salient point detection methods are used to choose sample points; these methods are compared to each other and to random selection. Finally, information from two local descriptors is combined in two ways and changes in performance are investigated. This paper presents results of these experiments.
Proceedings Title: Three-Dimensional Image Processing (3DIP) and Applications II
Conference Dates: May 31, 2012
Conference Location: San Francisco, CA
Conference Title: SPIE 8290, 82900N (2012)
Pub Type: Conferences
3D shape retrieval, local descriptor, bag-of-words algorithm, nonrigid models