Abstract
In this review study, a different multimodal biometric approach based on digital image watermarking is discussed. Although some of the multimodal approaches combined the score of each biometric system separately, applying biometric digital image watermarking is useful due to more security and simplicity issues In spite of difficulties to develop multimodal biometric systems, currently many studies are done to improve these systems. However, it seems it is required to have one review paper in this area for researchers who currently work in this field. The results show that embedding voice biometric in face image not only can improve the recognition performance, but also, can improve the security of the multimodal biometric systems.
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