Development of reversible video watermarking algorithm based on hybrid DWT-SVD

Abstract

The research work aimed to develop a reversible DWT-SVD. We reviewed different methods for reversible video watermarking which gives linear response for data integrity, authentication and content protection. Spatial domain methods are normally fragile adversary-based attacks. Thus, for developing robustness and fragility balanced technique, research work is carried out in the transform domain. DWT has the excellent capacity of localization of special-frequency and multi-resolution characteristics. This is suitable to identify areas where watermark can be invisibly embedded. In case of small perturbation, singular values do not give large variation, also intrinsic algebraic properties are represented by singular values. SVD is computationally expensive, therefore hybrid DWT-SVD method is developed to embed the watermark on video by modifying diagonal singular value coefficients of LL sub-band with scaling factor 0.10 and watermark itself. This method decreases computational cost and shows high robustness and fragility balance. Dynamic access code (DAC) is generated for authentication purpose, so that at the receiving stage the original video or transmitted data is available only to the specified user. Benchmarking of software written in MATLAB, by selecting different videos and watermark on it. Experimental results give the efficiency of proposed algorithm with reference to visual effects and analysis of qualitative and quantitative measures for PSNR and CC. The proposed method can be implemented in the area of military applications, medical image analysis, law enforcement, healthcare.