Biometric Signature Authentication Using Radon Transform-Based Watermarking Techniques

In this paper we propose a signature-based biometric authentication system, where watermarking techniques are used to embed some dynamic signature features in a static representation of the signature itself. User authentication can be performed either by means of the only signature static image, or by using it together with the dynamic features embedded in the enrollment stage, by using a fusion approach. A multilevel authentication system, which is capable to provide two different levels of security, is then obtained. The proposed watermarking techniques are based on the properties of the Radon transform which well fits to the signature images. A robust embedding is obtained while keeping unaltered the original structure of the host signal.