Discriminative learning quadratic discriminant function for handwriting recognition

IEEE Transactions on Neural Networks
Cheng-Lin LiuHiromichi Fujisawa

Abstract

In character string recognition integrating segmentation and classification, high classification accuracy and resistance to noncharacters are desired to the underlying classifier. In a previous evaluation study, the modified quadratic discriminant function (MQDF) proposed by Kimura et al. was shown to be superior in noncharacter resistance but inferior in classification accuracy to neural networks. This paper proposes a discriminative learning algorithm to optimize the parameters of MQDF with aim to improve the classification accuracy while preserving the superior noncharacter resistance. We refer to the resulting classifier as discriminative learning QDF (DLQDF). The parameters of DLQDF adhere to the structure of MQDF under the Gaussian density assumption and are optimized under the minimum classification error (MCE) criterion. The promise of DLQDF is justified in handwritten digit recognition and numeral string recognition, where the performance of DLQDF is comparable to or superior to that of neural classifiers. The results are also competitive to the best ones reported in the literature.

References

Jan 1, 1997·IEEE Transactions on Systems, Man, and Cybernetics. Part B, Cybernetics : a Publication of the IEEE Systems, Man, and Cybernetics Society·P D GaderJ H Chiang
Jan 1, 1987·IEEE Transactions on Pattern Analysis and Machine Intelligence·F KimuraY Miyake

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Citations

May 18, 2013·IEEE Transactions on Pattern Analysis and Machine Intelligence·Xu-Yao Zhang, Cheng-Lin Liu
Jan 5, 2005·IEEE Transactions on Pattern Analysis and Machine Intelligence·Simone MarinaiComputer Society
Nov 4, 2004·IEEE Transactions on Pattern Analysis and Machine Intelligence·Christophe Garcia, Manolis Delakis
Sep 2, 2016·Frontiers in Cellular Neuroscience·JianGang WangChengbiao Lu

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