【摘要】 提出一种基于小波变换和奇异值分解的数字图像水印算法,针对数字图像的特点,充分利用人类视觉系统(HVS)的特性和图像奇异值的稳定性,先将原始图像进行两级小波分解,再将得到的概貌系数进行奇异值分解,然后利用加性准则修改原始图像的奇异值信息,实现水印的嵌入。MATLAB仿真结果表明,改进算法在保证水印不可感知性的基础上,对常规攻击如JPEG压缩、高斯噪声、椒盐噪声、高斯低通滤波、中值滤波、缩小、放大、旋转等的鲁棒性较强,可用于版权保护。更多还原

【Abstract】 This paper proposed a new semi-blind reference watermarking scheme based on discrete wavelet transform( DWT) and singular value decomposition( SVD) for copyright protection and authenticity. For watermark embedding,wavelet decomposition was carried out twice with the original image. After that we embed watermark into reference image by modifying the singular values of the approximation coefficient using the singular values of the watermark. The MATLAB simulation results show that the proposed scheme is able to withstand a variety of attacks and can be used for copyright protection.更多还原