摘要
提出了一种基于小波变换低频系数的数字水印嵌入和检测算法。其中使用了有意义的二值图像水印来替代随机序列,先将水印通过Arnold置乱加密后再全部嵌入到低频子带系数中。该算法利用了人眼视觉系统(HVS)特性对水印嵌入强度做自适应调节以增强水印的鲁棒性和保证水印的不可感知性。实验结果表明,使用该算法嵌入的数字水印具有很好的隐蔽性,并且嵌入水印的图像对有损压缩、滤波、加入随机噪声和旋转等操作具有较强的抵御攻击能力。
A new watermarking algorithm is proposed in the paper and watermarks were embedded and extracted in the low-frequency subband after muhiresolution decomposition. Instead of using a random sequence, a visually meaningful gray scale logo is used as watermark which is scrambled by Arnold transform. The method uses the characteristic of human visual system （HVS） to enhance the robustness of the watermark and avoids the perceptibility of human eyes. Experimental results show that the embedded digital watermarking is invisible and robust enough against common image processing such as JPEG compression, filter, adding the stochastic noises and rotation.
关键词
水印置乱
离散小波变换
人眼视觉系统
鲁棒性
信息安全
watermarking scrambling
Discrete Wavelet Transform （DWT）
Human Visual System （HVS）
robustness
information security
