Computing watermarks from images using quadtrees

Digital watermarking techniques can protect the intellectual property rights of images efficiently. A new digital watermarking technique is presented in this paper, which can meet all the requirements of the image watermarking. This methodology uses a quadtree to record the information of a protected host image and the related watermark. The quadtree can help the processing of watermark casting and watermark verification successfully. Besides that, from the experimental results, we show that the proposed scheme can robustly recover recognizable watermarks from a variety of attacked host images.