Summary
This paper talk about a graph-based symbol recognizer. The authors used a graph called Attribute Relational Graph. The authors try to use such graph and find isomorphism.
The graph represents the topology of the primitive shapes in the graph. In their user study they collected several types of symbols and used their four matching algorithms on the data. The results were from around 68% to 98%
Discussion
I think they could have used better search approaches to this problem
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