Abstract
Morphological filters, evolved from the traditional envelope filter, are function oriented filtration techniques. A recent research on the implementation of morphological filters was based on the theoretical link between morphological operations and the alpha shape. However the Delaunay triangulation on which the alpha shape method depends is costly for large areal data. This paper proposes a divide-and-conquer method as an optimization to the alpha shape method aiming to speed up its performance. The large areal surface is divided into small sub-surfaces so that the alpha shape method is executed on the partitioned surfaces in a fast manner. The contact points are searched on each sub-surface and merged into a super set on which the alpha shape method is applied again to archive the updated result. The recursion process is repeated until the contact points of the whole surface are obtained. The morphological envelope could be computed recursively without the 3D Delaunay triangulation to the whole surface data. Meanwhile this method retains almost all the merits of the alpha shape method. The experiment shows that the result obtained by the divide-and-conquer algorithm is consistent with the one generated by applying the alpha shape method directly. The performance evaluation reveals that the divide-and-conquer algorithm achieved superior performances over the original alpha shape method.
| Original language | English |
|---|---|
| Pages (from-to) | 142-147 |
| Number of pages | 6 |
| Journal | Procedia CIRP |
| Volume | 10 |
| DOIs | |
| Publication status | Published - 19 Sep 2013 |
| Event | 12th CIRP Conference on Computer Aided Tolerancing - Huddersfield, United Kingdom Duration: 18 Apr 2012 → 19 Apr 2012 https://www.tib.eu/en/search/id/TIBKAT%3A784140057/12th-CIRP-Conference-on-Computer-Aided-Tolerancing/ (Link to Conference Details ) |
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An efficient divide-and-conquer algorithm for morphological filters. / Lou, Shan; Jiang, Xiangqian; Scott, Paul J.
In: Procedia CIRP, Vol. 10, 19.09.2013, p. 142-147.Research output: Contribution to journal › Article
TY - JOUR
T1 - An efficient divide-and-conquer algorithm for morphological filters
AU - Lou, Shan
AU - Jiang, Xiangqian
AU - Scott, Paul J.
PY - 2013/9/19
Y1 - 2013/9/19
N2 - Morphological filters, evolved from the traditional envelope filter, are function oriented filtration techniques. A recent research on the implementation of morphological filters was based on the theoretical link between morphological operations and the alpha shape. However the Delaunay triangulation on which the alpha shape method depends is costly for large areal data. This paper proposes a divide-and-conquer method as an optimization to the alpha shape method aiming to speed up its performance. The large areal surface is divided into small sub-surfaces so that the alpha shape method is executed on the partitioned surfaces in a fast manner. The contact points are searched on each sub-surface and merged into a super set on which the alpha shape method is applied again to archive the updated result. The recursion process is repeated until the contact points of the whole surface are obtained. The morphological envelope could be computed recursively without the 3D Delaunay triangulation to the whole surface data. Meanwhile this method retains almost all the merits of the alpha shape method. The experiment shows that the result obtained by the divide-and-conquer algorithm is consistent with the one generated by applying the alpha shape method directly. The performance evaluation reveals that the divide-and-conquer algorithm achieved superior performances over the original alpha shape method.
AB - Morphological filters, evolved from the traditional envelope filter, are function oriented filtration techniques. A recent research on the implementation of morphological filters was based on the theoretical link between morphological operations and the alpha shape. However the Delaunay triangulation on which the alpha shape method depends is costly for large areal data. This paper proposes a divide-and-conquer method as an optimization to the alpha shape method aiming to speed up its performance. The large areal surface is divided into small sub-surfaces so that the alpha shape method is executed on the partitioned surfaces in a fast manner. The contact points are searched on each sub-surface and merged into a super set on which the alpha shape method is applied again to archive the updated result. The recursion process is repeated until the contact points of the whole surface are obtained. The morphological envelope could be computed recursively without the 3D Delaunay triangulation to the whole surface data. Meanwhile this method retains almost all the merits of the alpha shape method. The experiment shows that the result obtained by the divide-and-conquer algorithm is consistent with the one generated by applying the alpha shape method directly. The performance evaluation reveals that the divide-and-conquer algorithm achieved superior performances over the original alpha shape method.
KW - Alpha shape
KW - Divide-and-conquer
KW - Morphological filter
KW - Surface texture
UR - http://www.scopus.com/inward/record.url?scp=84884833030&partnerID=8YFLogxK
U2 - 10.1016/j.procir.2013.08.024
DO - 10.1016/j.procir.2013.08.024
M3 - Article
AN - SCOPUS:84884833030
VL - 10
SP - 142
EP - 147
JO - Procedia CIRP
JF - Procedia CIRP
SN - 2212-8271
ER -