An Overview of Multimodal Biometrics

Unimodal biometrics has several problems such as noisy data, intra class variation, inter class similarities, non universality and spoofing which cause this system less accurate and secure. To overcome these problems and to increase level of security multimodal biometrics is used. Multimodal biometrics makes the use of multiple source of information for personal authentication. Multimodal biometrics has becoming very popular now days since it is at the frontier of unimodal biometrics. This paper presents an overview of multimodal biometrics. This includes the block diagram of general multimodal biometrics, modules of multimodal biometric system, different levels of fusion in multimodal biometrics and related work is also covered in this paper.