Analysis of Class Separation and Combination of Class-Dependent Features for Handwriting Recognition

ÐIn this paper, we propose a new approach to combine multiple features in handwriting recognition based on two ideas: feature selection-based combination and class-dependent features. A nonparametric method is used for feature evaluation, and the first part of this paper is devoted to the evaluation of features in terms of their class separation and recognition capabilities. In the second part, multiple feature vectors are combined to produce a new feature vector. Based on the fact that a feature has different discriminating powers for different classes, a new scheme of selecting and combining class-dependent features is proposed. In this scheme, a class is considered to have its own optimal feature vector for discriminating itself from the other classes. Using an architecture of modular neural networks as the classifier, a series of experiments were conducted on unconstrained handwritten numerals. The results indicate that the selected features are effective in separating pattern classes and the new feature vector derived from a combination of two types of such features further improves the recognition rate. Index TermsÐHandwriting recognition, class separation, nonparametric method, class-dependent feature combination, modular neural network.