Visible image watermarking using biorthogonal wavelet transform

Abstract

In this paper, visible image watermarking algorithm based on biorthogonal wavelet transform is proposed. The watermark (logo) of type binary image can be embedded in the host gray image by using coefficients bands of the transformed host image by biorthogonal transform domain. The logo image can be embedded in the top-left corner or spread over the whole host image. A scaling value (α) in the frequency domain is introduced to control the perception of the watermarked image. Experimental results show that this watermark algorithm gives visible logo with and no losses in the recovery process of the original image, the calculated PSNR values support that. Good robustness against attempt to remove the watermark was shown upon attempting different attacks, such as histogram equalization, double winner filtering and scaling.