Interval type-2 fuzzy inference systems as integration methods in modular neural networks for multimodal biometry and its optimisation with genetic algorithms

Authors:
Denisse Hidalgo;Oscar Castillo;Patricia Melin
Affiliations:
Tijuana Institute of Technology, Tijuana BC, Mexico.;Tijuana Institute of Technology, Tijuana BC, Mexico.;Tijuana Institute of Technology, Tijuana BC, Mexico
Venue:
International Journal of Biometrics
Year:
2008

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Abstract

In this paper a comparative study of fuzzy inference systems as methods of integration in Modular Neural Networks (MNNs) for multimodal biometry is presented. These methods of integration are based on type-1 and type-2 fuzzy logic. Also, the fuzzy systems are optimised with simple genetic algorithms. First, we considered the use of type-1 fuzzy logic and later the approach with type-2 fuzzy logic. The fuzzy systems were developed using genetic algorithms to handle fuzzy inference systems with different membership functions, like the triangular, trapezoidal and Gaussian; since these algorithms can generate the fuzzy systems automatically. Then the response integration of the MNN was tested with the optimised fuzzy integration systems. The comparative study of type-1 and type-2 fuzzy inference systems was made to observe the behaviour of the two different integration methods of MNNs for multimodal biometry.