Abstract
A wavelet-based feature extraction algorithm is proposed for character images. The contours of character contain most of information that discriminates the different classes of characters. The proposed algorithm is primarily based on the notion that the wavelet transformation decomposes a 2-dimenional image into three high-frequency sub-bands representing the vertical, horizontal, and diagonal edges. Several schemes of partitioning the sub-bands into blocks are presented that are mesh-like or slice-like. The moments are extracted from each of the blocks and they are taken as the features. The low-frequency sub-band is also used to compute the moments. Experiments performed with two character recognition problems showed promising results and the comparison with other features revealed a superior recognition rate of the proposed algorithm.
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References
Trier, O.D., Jain, A.K., Taxt, T.: Feature extraction methods for character recognition-A survey. Pattern Recognition 29(4), 641–662 (1996)
Tang, Y.Y., Li, B.F., Ma, H., Liu, J.: Ring-projection-waveletfractal signatures: A novel approach to feature extraction. IEEE Transactions on Circuits and Systems 45(8), 1130–1134 (1998)
Zhang, P., Bui, T.D., Suen, C.Y.: Recognition of similar objects using 2-D wavelet-fractal feature extraction. International Conference on Pattern Recognition 2, 316–319 (2002)
Chen, G., Bui, T.D.: Invariant fourier-wavelet descriptor for pattern recognition. Pattern Recognition 32(7), 1083–1088 (1999)
Lee, S.W., Kim, C.H., Ma, H., Tang, Y.Y.: Multiresolution recognition of unconstrained handwritten numerals with wavelet transform and multilayer cluster neural network. Pattern Recognition 29(2), 1953–1961 (1996)
Srikantan, G., Lam, S.W., Srihari, S.N.: Gradient-based contour encoding for character recognition. Pattern Recognition 29(7), 1147–1160 (1996)
Oh, I.-S., Suen, C.Y.: Distance features for neural network-based recognition of handwritten characters. International Journal on Document Analysis and Recognition 1(2), 73–88 (1998)
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© 2003 Springer-Verlag Berlin Heidelberg
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Park, JH., Oh, IS. (2003). Wavelet-Based Feature Extraction from Character Images. In: Liu, J., Cheung, Ym., Yin, H. (eds) Intelligent Data Engineering and Automated Learning. IDEAL 2003. Lecture Notes in Computer Science, vol 2690. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-45080-1_157
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DOI: https://doi.org/10.1007/978-3-540-45080-1_157
Publisher Name: Springer, Berlin, Heidelberg
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