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Biometric authentication is an emerging technology that utilize biometric data for the purpose of person identification or recognition in security applications. A number of biometrics can be used in a person authentication system. Among the widely used biometrics, voice and face traits are most promising for pervasive application in every life, because they can be easily obtained using unobtrusive and user-friendly procedures. The ubiquitousness of low-cost audio and visual capture sensors on smart phones, laptops, and tablets has made the advantages of voice and face biometrics more outstanding compared with others. For quite a long time, the use of acoustic information alone has been a great success for speaker authentication applications. Meanwhile, the last decades or two also witnessed great advancement in face recognition technologies. However, in adverse operating environments, neither of these …