A MRF model with parameter optimization by CRF for on-line recognition of handwritten Japanese characters

Bilan Zhu; Masaki Nakagawa

doi:10.1117/12.873366

24 January 2011 A MRF model with parameter optimization by CRF for on-line recognition of handwritten Japanese characters

Bilan Zhu, Masaki Nakagawa

Author Affiliations +

Proceedings Volume 7874, Document Recognition and Retrieval XVIII; 787407 (2011) https://doi.org/10.1117/12.873366
Event: IS&T/SPIE Electronic Imaging, 2011, San Francisco Airport, California, United States

Abstract

This paper describes a Markov random field (MRF) model with weighting parameters optimized by conditional random field (CRF) for on-line recognition of handwritten Japanese characters. The model extracts feature points along the pen-tip trace from pen-down to pen-up and sets each feature point from an input pattern as a site and each state from a character class as a label. It employs the coordinates of feature points as unary features and the differences in coordinates between the neighboring feature points as binary features. The weighting parameters are estimated by CRF or the minimum classification error (MCE) method. In experiments using the TUAT Kuchibue database, the method achieved a character recognition rate of 92.77%, which is higher than the previous model's rate, and the method of estimating the weighting parameters using CRF was more accurate than using MCE.

Citation Download Citation

Bilan Zhu and Masaki Nakagawa "A MRF model with parameter optimization by CRF for on-line recognition of handwritten Japanese characters", Proc. SPIE 7874, Document Recognition and Retrieval XVIII, 787407 (24 January 2011); https://doi.org/10.1117/12.873366

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