Gholamreza Anbarjafari
University of Tartu, Institute of Technology, Estonia
Title: A Robust Color Image Watermarking Scheme Using Entropy and QR Decomposition
Biography
Biography: Gholamreza Anbarjafari
Abstract
Internet has affected our everyday life drastically. An extensive amount of information is continuously exchanged over the Internet which raises numerous security concerns. Issues such as content identification, document and image security, audience measurement, ownership and copyright among others can be settled by the use of digital watermarking. In this talk, robust and imperceptible non-blind color image watermarking algorithm is discussed, which benefit from the fact that watermark can be hidden in different color channel which results in to further robustness of the proposed technique to attacks. Given method uses some algorithms such as entropy, discrete wavelet transform, Chirp z-transform, orthogonal-triangular decomposition and Singular value decomposition in order to embed the watermark in a color image. As the values of main diagonal of R matrix in QR decomposition and also the singular values obtained via SVD are very big those changes caused by aforementioned attack will not change those values significantly. Most facmous signal processing attacks will be discussed and the robustness of the aforementioned technique on those techniques will be explained.