Elyazisi Tanima Sistemlerinde Doǧrusal Boyut İndirgeme Yöntemleri

Handwritten Character Recognition Systems can be divided into three steps: pre-processing, feature extraction and classification. In the feature extraction process, representation power of features should be increased yet keeping the number of features as small as possible. In this study, raw character image vectors are projected to lower dimension spaces by different linear transformations and their representation and discrimination power are compared. In dimension reduction, Principal Component Analysis (PCA), Multiple Discriminant Analysis (MDA) and Independent Component Analysis (ICA) are compared and best classification performance is obtained by using ICA. A multi layer perceptron, which is trained by conjugate gradient algorithm, is used for classification. The handwritten character database, studied on, consists of 5000 training patterns and 2500 test patterns.