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Feature selection for facial expression recognition based on optimization algorithm

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2 Author(s)
Seyed Mehdi Lajevardi ; School of Electrical and Computer Engineering, RMIT University Melbourne, Australia ; Zahir M. Hussain

This paper presents a wrapper approach to feature selection from image sequences and applies it to the facial expression classification problem. The pre-processing phase automatically scans image sequences and detects frames with maximum intensity of facial expression. The features are generated using the log-Gabor filters. A global optimization algorithm genetic algorithm (GA) is adopted to select a sub-set of features based on minimization of the classification error. The wrapper approach is compared with two previously known filter-based feature selection methods: MID-mRMR and MIQ-mRMR. The features are classified using the naive Bayesian (NB) classifier. The average classification rates are: 79% (MIQ-mRMR), 78% (wrapper) and 64% (MID-mRMR). The results from the filter methods did not appear to be significantly effected by the size of the feature subset.

Published in:

2009 2nd International Workshop on Nonlinear Dynamics and Synchronization

Date of Conference:

20-21 July 2009