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Discriminative quadratic feature learning for handwritten Chinese character recognition
Zhou, Ming-Ke; Zhang, Xu-Yao; Yin, Fei; Liu, Cheng-Lin
AbstractIn this paper, we propose a feature learning method for handwritten Chinese character recognition (HCCR), called discriminative quadratic feature learning (DQFL). Based on original gradient direction feature representation, quadratic correlation between features is used to promote the feature dimensionality, then discriminative feature extraction (DFE) is used for dimensionality reduction. By combining dimensionality promotion and reduction, we can learn a much more discriminative and nonlinear feature representation, which can then boost the classification accuracy significantly. For dimensionality promotion, two types of correlation are exploited, namely, statistical correlation and spatial correlation. Statistical correlation is computed on multiple local feature vectors in different regions of the character image; while spatial correlation encodes the dependency between features of two positions. Feature correlation increases the dimensionality by over 40,000. DFE then reduces the dimensionality to less than 300 without losing discriminability. Classification is performed using nearest prototype classifier (NPC), modified quadratic discriminant function (MQDF) and discriminative learning quadratic discriminant function (DLQDF). In experiments on the CASIA-HWDB1.1 standard dataset, the proposed DQFL method improves the test accuracies of NPC, MQDF and DLQDF by 4.94%, 1.83%, and 1.82%, respectively. The test accuracy is further improved by training set expansion. On the ICDAR 2013 Chinese handwriting recognition competition dataset, the proposed DQFLA+DLQDF classifier outperforms the best participating system based on deep convolutional neural network (CNN), while the test speed is much faster. (C) 2015 Elsevier Ltd. All rights reserved.
KeywordHandwritten Chinese Character Recognition Discriminative Feature Learning Quadratic Correlation Dimensionality Promotion Training Set Expansion
WOS HeadingsScience & Technology ; Technology
Indexed BySCI
WOS Research AreaComputer Science ; Engineering
WOS SubjectComputer Science, Artificial Intelligence ; Engineering, Electrical & Electronic
WOS IDWOS:000363077400001
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Document Type期刊论文
Corresponding AuthorLiu, Cheng-Lin
AffiliationChinese Acad Sci, Inst Automat, Natl Lab Pattern Recognit, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Zhou, Ming-Ke,Zhang, Xu-Yao,Yin, Fei,et al. Discriminative quadratic feature learning for handwritten Chinese character recognition[J]. PATTERN RECOGNITION,2016,49(1):7-18.
APA Zhou, Ming-Ke,Zhang, Xu-Yao,Yin, Fei,&Liu, Cheng-Lin.(2016).Discriminative quadratic feature learning for handwritten Chinese character recognition.PATTERN RECOGNITION,49(1),7-18.
MLA Zhou, Ming-Ke,et al."Discriminative quadratic feature learning for handwritten Chinese character recognition".PATTERN RECOGNITION 49.1(2016):7-18.
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