A robust blind image watermarking based on Double Haar Wavelet Transform (DHWT)

Abstract

This study proposes a blind watermarking algorithm based on Double Haar Wavelet Transform (DHWT) for copyright protection of digital images. Watermark embedding is performed in wavelet transform domain. DHWT is applied to the original cover image and binary watermark. Singular value decomposition (SVD) is applied on selected subband of cover image and binary watermark. Eigen values of selected subband of cover image are replaced by Eigen values of selected subband of binary watermark, which are multiplied with an appropriate strength factor. Proposed algorithm achieved very high imperceptibility, evidenced by high PSNR value for gray scale images, and produced very high robustness against image processing attacks.