An Effective Wavelet-Based Watermarking Scheme Using Human Visual System for Protecting Copyrights of Digital Images

Abstract

Abstract-The modern era of information technology facilitates easy duplication, manipulation and distribution of digital data. This has demanded the certainty for effectively safe guarding the rightful ownership of digital images. Copyright protection and content authentication of digital images have emerged as an imperative concern to content owners and distributors. Digital watermarking provided a potential solution to this issue. The watermarking scheme must possess the characteristics of robustness and imperceptibility to ensure efficient copyright protection. An effective copyright protection is achieved by the incorporation of Human Visual System (HVS) models into watermarking scheme. Recently, interest in watermarking researches are chiefly fascinated by wavelet domain based watermarking schemes. In our earlier work, we have presented an imperceptible and efficient wavelet-based watermarking scheme for protecting the copyrights of images. Here, we have offered a proficient watermarking scheme by effecting some changes to our earlier work. The presented scheme for watermarking incorporates the HVS models into watermark embedding. The biorthogonal wavelet transform with lifting scheme is utilized in the watermarking. The image components for embedding are selected based on the entropy masking. A random matrix is generated on the basis of a key image and is engaged in both embedding and extraction processes. The correlation coefficient computation is made use of in the extraction of watermark. The experimental results illustrate the robustness and imperceptibility of the proposed approach.

Encryption and Hiding Watermarking Using A Chaotic Modified Wavelet Transform

“…In non-Blind methods the original image itself are employed for the extraction of watermark, While the certain characteristics of the original image are engaged by the semi-Blind methods, whereas the detection process in the Blind methods do not necessitate the original image. A good watermarking scheme should be robust enough to define against attacks while being invisible such that the dissimilarity between the watermarked image and the host image should not be distinguishable by the human eyes [4] In this paper a simple and efficient security system is introduced to protect the ownership of digital image using non-blind imperceptibly encrypted binary image watermarking based on DWT using chaotic function to generate random sequence used to select DWT coefficient that will be used in embedding. Chaotic Logistic map function was used twice, first time for watermarking encryption and second for watermarking hiding in host image.…”

“…Y and Y  are original and watermarked image respectively.d. Correlation(corr): compute the correlation coefficient between the original image (A) and the watermarked image(B)[4]:…”

Anti-cropping digital image watermarking using Sudoku

“…In spatial domain technique, the watermark embedding is done by directly modifying the pixel values of the host image (Fu et al, 2008;Aggarwal and Singla, 201 1). In transform domain technique, the host image is first converted into frequency domain by a transformation method such as the Discrete Cosine Transform (DCT) or Discrete Wavelet Transform (DWT) @eddy and Varadarajan, 2010;Kundur and Hatzinakos, 2004). Then, watermark is embedded by modifying its coefficients.…”