Study on Image Watermarking in DWT Domain Based on ESPIHT Algorithm
Zhu Yifeng · Journal of Changchun University of Science and Technology · 2009
In the paper, we propose a robust image watermarking technology in DWT domain based on ESPIHT algorithm (extended set partitioning in hierarchical trees). By taking into account sufficiently in the masking characteristics of the human visual system ,two neighboring blocks are selected from the Hilbert sequence of the host image blocks in turn, and it is designed to improve on two important issues of digital watermarking. One is the requirement of robustness, the other is watermark detection. A binary image watermark is embedded into the host image by modifying the polarity of the average value of the two corresponding subbands. As a result ,the experiment shows the presented algorithm is effective and robust to common image processing operations and some distortions such as cropping, pinching, pixel-shift and so on.