High speed rough classification for handwritten characters using hierarchical learning vector quantization

Yuuji Waizumi, Nei Kato, Kazuki Saruta, Yoshiaki Nemoto

Research output: Contribution to conferencePaper

2 Citations (Scopus)

Abstract

Today, high accuracy of character recognition is attainable using Neural Network for problems with relatively small number of categories. But for large categories, like Chinese characters, it is difficult to reach the neural network convergence because of the `local minima problem' and a large number of calculation. Studies are being done to solve the problem by splitting the neural network into some small modules. The effectiveness of the combination of Learning Vector Quantization (LVQ) and Back Propagation (BP) has been reported. LVQ is used for rough classification and BP is used for fine recognition. It is difficult to obtain high accuracy for rough classification by LVQ itself. In this paper, to deal with this problem, we propose Hierarchical Learning Vector Quantization (HLVQ). HLVQ divides categories in feature space hierarchically in learning procedure. The adjacent feature spaces overlap each other near the borders. HLVQ possesses both classification speed and accuracy due to the hierarchical architecture and the overlapping technique. In the experiment using ETL9B, the largest database of handwritten character in Japan, (includes 3036 categories, 607,200 samples), the effectiveness of HLVQ was verified.

Original languageEnglish
Pages23-27
Number of pages5
Publication statusPublished - 1997 Jan 1
EventProceedings of the 1997 4th International Conference on Document Analysis and Recognition, ICDAR'97. Part 1 (of 2) - Ulm, Ger
Duration: 1997 Aug 181997 Aug 20

Other

OtherProceedings of the 1997 4th International Conference on Document Analysis and Recognition, ICDAR'97. Part 1 (of 2)
CityUlm, Ger
Period97/8/1897/8/20

ASJC Scopus subject areas

  • Computer Vision and Pattern Recognition

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  • Cite this

    Waizumi, Y., Kato, N., Saruta, K., & Nemoto, Y. (1997). High speed rough classification for handwritten characters using hierarchical learning vector quantization. 23-27. Paper presented at Proceedings of the 1997 4th International Conference on Document Analysis and Recognition, ICDAR'97. Part 1 (of 2), Ulm, Ger, .