Postprint version. Published in Pattern Recognition, Volume 29, Issue 6, June 1, 1996, pages 1031-1048.
NOTE: At the time of publication, the author Fred DePiero was affiliated with University of Tennessee - Knoxville. Currently, August 2008, he is a faculty member in the College of Engineering at California Polytechnic State University - San Luis Obispo.
The definitive version is available at http://dx.doi.org/10.1016/0031-3203(95)00140-9.
An algorithm has been developed that finds isomorphisms between both graphs and subgraphs. The development is introduced in the object recognition problem domain. The method isolates matching subgraphs, finds a node-to-node mapping and reorders nodes, thus permitting a direct comparison to be made between the resultant graphs. The algorithm is of polynomial order. It yields approximate results, maintaining a performance level for subgraph isomorphisms at or above 95% under a wide variety of conditions and with varying levels of noise. The performance on the full size comparisons associated with graph isomorphisms has been found to be 100/100, also under a variety of conditions. Performance metrics, methods of testing and results are presented.
Electrical and Computer Engineering