Digital watermarking using combination of Ranklets and wavelets

Abstract

Tine to the widespread use of multimedia data over the internet, it has become important to protect the data from unauthorized access and make the information secure. Digital watermarking is the solution to prevent unauthorized access and to protect the copyright. In this paper, a naive watermarking scheme has been proposed. The authors for the first time have introduced Ranklets which is a new domain for watermarking along with discrete wavelet transform (DWT). To achieve better robustness and imperceptibility, the proposed scheme makes use of the Ranklets to select the mid-rank coefficients for watermark embedding. The wilxon statistics have been used for dispersion in Rank transform. Extensive experiments have been carried out to prove the claim of better robustness and imperceptibility.