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International Journal on Document Analysis and Recognition (IJDAR)

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03-01-2020 | Original Paper

A general framework for the recognition of online handwritten graphics

Published in: International Journal on Document Analysis and Recognition (IJDAR) | Issue 2/2020

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Abstract

We revisit graph grammar and graph parsing as tools for recognizing graphics. A top-down approach for parsing families of handwritten graphics containing different kinds of symbols and of structural relations is proposed. It has been tested on two distinct domains, namely the recognition of handwritten mathematical expressions and of handwritten flowcharts. In the proposed approach, a graphic is considered as a labeled graph generated by a graph grammar. The recognition problem is translated into a graph parsing problem: Given a set of strokes (input data), a parse tree which represents the best interpretation is extracted. The graph parsing algorithm generates multiple interpretations (consistent with the grammar) that can be ranked according to a global cost function that takes into account the likelihood of symbols and structures. The parsing algorithm consists in recursively partitioning the stroke set according to rules defined in the graph grammar. To constrain the number of partitions to be evaluated, we propose the use of a hypothesis graph, built from data-driven machine learning techniques, to encode the most likely symbol and relation hypotheses. Within this approach, it is easy to relax the stroke ordering constraint allowing interspersed symbols, as opposed to some previous works. Experiments show that our method obtains accuracy comparable to methods specifically developed to recognize domain-dependent data.

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In a CNF, all production rules either have the form \(A \rightarrow a\), or \(A \rightarrow BC\), where a is a terminal and A, B, and C are non-terminals

Processing the whole validation set in up to 3 h (mean recognition time of 10 s).

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Title: A general framework for the recognition of online handwritten graphics
Publication date: 03-01-2020
Published in: International Journal on Document Analysis and Recognition (IJDAR) / Issue 2/2020
Print ISSN: 1433-2833
Electronic ISSN: 1433-2825
DOI: https://doi.org/10.1007/s10032-019-00349-6

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