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Journal of Applied Sciences

Year: 2012 | Volume: 12 | Issue: 12 | Page No.: 1282-1289
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Authors

Lydia Abdul Hamid

Dzati Athiar Ramli

Keywords

Research Article

Performances of Qualitative Fusion Scheme for Multi-biometric Speaker Verification Systems in Noisy Condition

Lydia Abdul Hamid and Dzati Athiar Ramli
Fusion of multiple modalities becomes a good strategy to improve the performance in biometric speaker verification as an audio based system accuracy decreases severely under noisy condition. However, for simple sum rule fusion scheme, this approach is only helpful if both systems have equal performances because it considers both models equally regardless of its conditions. As a consequence, a weighted sum rule is then experimented. Instead of varying the weight, this method calculates the sum of Equal Error Rate (EER) percentages produced from each modality for fusion weight computation. In this study, the information in term of Mel Frequency Cepstral Coefficient (MFCC) of speech signal is extracted while Region of Interest (ROI) of lip images has been used as a second modality for the multi-modal systems. The Support Vector Machine (SVM) classifier is executed for the verification system. From the experiment results, EER performances using simple sum rule and weighted sum rule at 35 dB SNR of speech signal and 0.9 noise density of visual signal are observed as 0.1548 and 0.1487%, respectively.
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