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Subgraph error-correcting isomorphisms for syntactic pattern recognition

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2 Author(s)
Wen-Hsiang Tsai ; Inst. of Computer Engng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; King-Sun Fu

The structure-preserved error-correcting graph isomorphism proposed by Tsai and Fu (1979) for matching patterns represented by attributed relational graphs is extended to the case of subgraphs. The resulting subgraph error-correcting isomorphism, which includes the structure-preserved error-correcting graph isomorphism as a special case, is useful for recognizing partially viewed or structurally distorted patterns. After formulating a subgraph error-correcting isomorphism as a state-space tree-search problem, heuristic information useful for speeding up the search is suggested and an ordered-search algorithm is proposed for finding an optimal subgraph error-correcting isomorphism.

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Systems, Man and Cybernetics, IEEE Transactions on  (Volume:SMC-13 ,  Issue: 1 )