A Robust Dual Digital-Image Watermarking Technique

In this paper, a robust dual watermarking technique is suggested that incorporates two watermarks in a host image for improved protection and robustness. To embed the watermark robustly and imperceptibly, watermark bits are added to the significant coefficients of each subband selected by considering the human visual system (HVS) characteristics. A watermark, named boat (will be called the secondary watermark), is embedded in the wavelet domain of a primary watermark before being embedded in the host image. From the experimental results it can be observed that proposed method is robust to wide variety of attacks.