On-line Handwritten Character Recognition Selectively Employing Hierarchical Spatial Relationships among Subpatterns

Junko Tokuno 1 Mitsuru Nakai 2 Hiroshi Shimodaira 3 Shigeki Sagayama 4 Masaki Nakagawa 1
1 TUAT - Tokyo University of Agriculture and Technology
2 Toyama Prefectural University
3 CSTR - The Centre for Speech Technology Research [Edinburgh]
4 The University of Tokyo
Abstract : This paper proposes an on-line handwritten character pattern recognition method that examines spatial relationships among subpatterns which are components of a character pattern. Conventional methods evaluating spatial relationships among subpatterns have not considered characteristics of deformed handwritings and evaluate all the spatial relationships equally. However, the deformations of spatial features are different within a character pattern. In our approach, we assume that the distortions of spatial features are dependent on the hierarchy of character patterns so that we selectively evaluate hierarchical spatial relationships of subpatterns by employing Bayesian network as a post-processor of our sub-stroke based HMM recognition system. Experiments on on-line handwritten Kanji character recognition with a lexicon of 1,016 elementary characters revealed that the approach we propose improves the recognition accuracy for different types of deformations.
Keywords : On-line handwriting recognition sub-stroke HMM Bayesian network distorted handwriting spatial relationships among subpatterns
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Conference papers
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Submitted on : Monday, October 9, 2006 - 12:25:19 PM
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Junko Tokuno, Mitsuru Nakai, Hiroshi Shimodaira, Shigeki Sagayama, Masaki Nakagawa. On-line Handwritten Character Recognition Selectively Employing Hierarchical Spatial Relationships among Subpatterns. Tenth International Workshop on Frontiers in Handwriting Recognition, Université de Rennes 1, Oct 2006, La Baule (France). ⟨inria-00104751⟩

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