Computer Vision Pattern Recognition

# Modeling with Pattern Recognition Decision Rules by Earle T.C.

By Earle T.C.

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Extra resources for Modeling with Pattern Recognition Decision Rules

Example text

If two graphs are isomorphic, their dMCS distance is 0; on the other hand, if two graphs have no part in common, their dMCS distance is 1. It has been shown that dMCS is a metric and produces a value in [0, 1]. A second distance measure which has been proposed in [105], based on the idea of graph union, is dWGU (g1 , g2 ) = 1 − |mcs(g1 , g2 )| |g1 | + |g2 | − |mcs(g1 , g2 )| . By graph union it is meant that the denominator represents the size of the union of the two graphs in the set-theoretic sense.

The overall idea of graph edit distance is to define the dissimilarity of two graphs by the minimum amount of distortion that is needed to transform one graph into another. There are various applications where the edit distance has proved to clustering December 28, 2009 9:59 Classification and Clustering Graph Edit Distance clustering 37 be suitable for error-tolerant graph matching [21, 53, 189]. In [21], for instance, graph edit distance is employed for the difficult task of fingerprint classification.

E. the meaning of the graphs, prior knowledge of the graphs’ labels is often inevitable for graph edit distance to be a suitable proximity measure. This fact is often considered as one of the major drawbacks of graph edit distance. Contrariwise, the possibility to parametrize graph edit distance by means of a cost function crucially amounts for the versatility of this particular dissimilarity model. That is, by means of graph edit distance it is possible to integrate domain specific knowledge about object similarity, if available, when defining the cost of the elementary edit operations.