基于DWT和SVD的鲁棒-脆弱双重图像水印算法

Image Robust-Fragile Dual Watermarking Algorithm Based on DWT and SVD

提出了一种基于DWT和SVD的鲁棒-脆弱双重图像水印算法。首先,对于鲁棒水印的嵌入,利用离散小波变换和奇异值分解,采用量化的方法将二值水印嵌入到原始图像中,水印的提取不需要原始图像。然后,在含鲁棒水印图像的空域LSB中嵌入脆弱水印,以减少脆弱水印对鲁棒水印的影响。实验证明,鲁棒水印具备较强的抗攻击能力,脆弱水印则对篡改敏感,并且能准确定位出篡改位置。两种水印的结合实现了对原始图像的双重保护。

A robust-fragile dual watermarking algorithm for digital image based on DWT and SVD is proposed in this paper. Firstly, to embed the robust watermark, we adopt the quantization method to embed one binary watermark image into the host image using the technology of wavelet transform and singular value decomposition, and the robust watermark can be extracted without the host image. Then, the fragile watermark is further embedded into LSB of the above watermarked image to reduce the fragile watermark＇ s influence towards robustness. The experimental results show that the robust watermark has great robustness for different kinds of attacks, and the fragile watermark is sensitive to tamper and has good accuracy of tamper localization. Therefore, the combination of the two watermarks achieves a double protection for the host image.