Study of neuro-fuzzy classifiers with an application to language separation of textual images

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Study of neuro-fuzzy classifiers with an application to language separation of textual images


Author: Chiu, Man-yau
Title: Study of neuro-fuzzy classifiers with an application to language separation of textual images
Degree: M.Sc.
Year: 1998
Subject: Fuzzy systems
Neural networks (Computer science)
Image processing -- Digital techniques
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: v, 139 leaves : ill. ; 30 cm
Language: English
Abstract: In this project, we developed a neuro-fuzzy classifier, which combines the merits of both fuzzy logic and neural networks, in order to achieve 'human-like' performance in pattern recognition. This neuro-fuzzy classifier can be trained using a set of training patterns by a hybrid learning scheme. Firstly, the K-means clustering is performed on the training patterns to initialize membership function parameters and to generate a set of fuzzy rules. Then, the parameters of the neuro-fuzzy classifier, namely membership function parameters, aggregator's parameters, and defuzzification parameters, are fine-tuned by using the error-backpropagation training algorithm to meet the pre-defined convergence criteria. By combining both unsupervised (K-means clustering) and supervised (error-backpropagation training algorithm) learning schemes, we can achieve a learning process which is faster than the one by using the error-backpropagation training algorithm alone. Furthermore, incorporating the fuzzy reasoning into a neural network model not only eliminates a disadvantage of a conventional multi-layer feedforward neural network in understanding and predicting its performance but also achieves an efficient and high performance defuzzification. The designed neuro-fuzzy classifier has been used to perform the textual image recognition task in which Chinese and English textual images are classified. In order to evaluate the effect of different network settings on the classifier's performance, we have tested different number of fuzzy partition for each input variable (3 or 5 linguistic labels) and different types of aggregation operators, namely local parameterized mean operator, global parameterized mean operator, and product operator, in constructing the neuro-fuzzy classifier. Experimental results show that a neuro-fuzzy classifier with each of the three aggregation operators can successfully classify all the training and the test textual images into correct language classes.

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