A Dual Watermarking Scheme for Ownership Verification and Pixel Level Authentication

Breaches of multimedia security are increasing day by day as advancement in technologies have tightly coupled the globe and promoted easy sharing of multimedia content in no loss of time. A dual watermarking scheme ascertaining the rightful ownership and integrity of images is proposed here. A gray scale logo used as copyright information of the owner is embedded imperceptibly into the singular values of the cover image in multiple locations. The multiplicity of embedding ensures extraction of embedded information even in worst tampered scenarios and hence, prove the rightful ownership. The proposed scheme also performed pixel wise authentication which fetched the advantage of accurate tamper localization in case of alterations. The visual quality of the watermarked image is maintained high as indicated by the high Peak-Signal-to-Noise-Ratio(PSNR) values. The robustness of the scheme is tested against comprehensive set of attacks and evaluated by various objective evaluation parameters. Objective evaluation parameters close to their ideal values demonstrate the efficacy of the proposed scheme over other existing state of art approaches.