提出一种基于数独的大容量动态水印算法,每像素的嵌入容量为2比特.先将原始图像分成大小为M×N像素不重叠区域,把大小为2M×N像素的若干个不同的水印嵌入到每个区域中.若加入水印后图像被篡改,则会造成篡改区域的水印不能正确提取.在任意时刻都可在感兴趣的区域中嵌入任意水印,即嵌入水印的位置和时间是按一定的协议动态确定的.实验结果表明该算法具有较大的水印嵌入容量和较高的篡改定位精确度.%In this paper the large-capacity dynamic multiple watermarking algorithm based on Sudoku was proposed with two bit/pixel embedding capacity. The original image was divided into M x N pixels non-overlapping areas. Different watermarks with size of 2 M x N pixels were embedded into the corresponding areas. If the watermarked area was tampered, the watermark in this area could not be extracted correctly. At any time, any watermarks can be embedded into any area as long as the areas are non-overlapping. The experimental results show that the proposed algorithm has a larger watermarking embedding capacity and higher accuracy of tampered localization.
展开▼
