基于奇异值分解的灰度级数字水印算法

提出了一种新的基于奇异值分解的灰度级数字水印算法。该算法将灰度级水印图像进行位平面分解后的数据从高位到低位分别嵌入原始图像子块奇异值分解后从大到小排列的奇异值中,并在算法中采取了抗亮度、对比度调整修正,使得该算法具备了抗亮度、对比度调整攻击的稳健性。实验结果表明,该算法具有很好的水印透明性,对亮度、对比度调整攻击具有特强的稳健性,并且对其他常见的图像处理攻击(如图像平滑、加噪声、颜色抖动和JPEG压缩等)也具有很强的稳健性。

Gray-level Digital Watermarking Algorithm Based on SVD

A novel SVD based gray-level digital watermarking algorithm is presented.In this algorithm,data from high bit to low bit of decomposed bit planes of the gray-level watermark image are embedded respectively into corresponding singular values from large to small obtained by SVD of sub blocks of the original image.And that the revision for resistance against brightness-and-contrast adjustment is adopted makes that this algorithm has the robustness against brightness-and-contrast adjustment attack.The experimental results show that this algorithm has fine transparency of the embedded watermark and has extremely strong robustness against brightness-and-contrast adjustment attack,and it has as well strong robustness against other common image-processing attacks such as image smoothing,noise adding,color dithering,and JPEG-compression.