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1 Performance Evaluation of Score Level Fusion in Multimodal Biometric Systems Web Computing Laboratory Computer Science and Information Engineering Department Fu Jen Catholic University Speaker: Wei Tin Lai Advisor Prof. Hsing Mei
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Outline Introduction Background RHE Normalization Experiment & Result Conclusion 2
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Introduction Classical user authentication system –Identification card –Key –Etc.. Biometric-based authentication system –Reliable verification –Reliable identification - Base on … 3
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Introduction Fingerprint 4 FaceFinger vein
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Introduction Are these reliable ? 5
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Introduction Unibiometric system –Noisy data –Lack of distinctiveness of the trait Multimodal biometric system –Combine multiple biometric samples (face, fingerprint..) –Normalization –Fusion 6
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Introduction 7
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Outline Introduction Background RHE Normalization Experiment & Result Conclusion 8
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Background Normalization –Min-Max normalization –max(X):maximum value of the raw matching scores –min(X):minimum value of the raw matching scores 9
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Background Min-Max normalization –Drawback: Sensitive to outliers Original data After normalization 10
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Background Z-Score normalization Also sensitive to outliners 11
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Background Tanh-Estimators normalization Oop…so many parameters... 12 ‧ Too many parameters have to be determined _
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Outline Introduction Background RHE Normalization Experiment & Result Conclusion 13
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RHE Normalization Reduction of High-scores Effect (RHE) Normalization Two observations –Normalization will causes loss of information –Suffer mainly from the ‘LOW’ genuine scores instead of ‘HIGH’ imposter scores 14
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RHE Normalization With these observation, RHE normalization procedure as follows: 1)Use the raw data if the range of data is similar.(Will not normalize the data). 2)Modify the min-max normalization formula to fit the ‘LOW’ genuine scores. 15
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RHE Normalization RHE normalization formula –X: the distribution of all raw scores. –X*:the distribution of all genuine raw scores Advantage: Performance will be increased. Drawback: ‘low’ impostor scores will also uplifted. 16
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Sum Rule-based Fusion The fused score(fs) is evaluated using following formula: W: weight In here we set all the weight to be 1 17
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Sum Rule-based Fusion The fused score(fs) is evaluated using following formula: W: weight In here we set all the weight to be 1 18
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SVM-based Fusion Support Vector Machines(SVM)-based Fusion Using for classification 19
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Outline Introduction Background RHE Normalization Experiment & Result Conclusion 20
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Experiment & Result National Institute of Standard and Technology(NIST) Biometric Score Set(BSSR1) Databases –NIST-Multimodal Face score(Matcher C,Matcher G) Fingerprint(Left index finger,Right index finger) –NIST-Face Face score(Matcher C, Matcher G) 21
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Experiment & Result Databases(cont.) –NIST-Fingerprint Left index finger Right index finger –Merged database of fingerprint, face and finger vein Face scores(Matcher G) Fingerprint scores(Right index finger) Finger vein 22
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Experiment & Result Genuine Accept Rate(GAR ) False Accept Rate(FAR) 23
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Experiment & Result 24
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Experiment & Result 25
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Experiment & Result 26
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Experiment & Result 27
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Outline Introduction Background RHE Normalization Experiment & Result Conclusion 28
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Conclusion Multimodal biometric modal has better performance than Unimodal biometric modal SVM fusion is better than Sum rule-based fusion if the parameters are determined RHE has better performance! 29
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Conclusion 30 Rating_Total Web application
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Conclusion 31
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Thank you! 32 Q&A
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