基于DWT的抗RST攻击鲁棒性数字水印

Robust Digital Watermark Resistant to RST Attacks Based on DWT

针对现有数字图像水印方法对几何变换攻击鲁棒性不足的问题,提出一种基于离散小波域的抗几何攻击数字水印方法,对图像进行离散小波变换,在其低频逼近子图嵌入水印,通过检测其不变矩实现数字水印检测。由于所选不变矩具有旋转、平移、尺度变换不变特征,因此该方法对几何变换攻击具有鲁棒性。仿真实验结果表明,该方法对普通加噪、滤波、JPEG压缩攻击以及旋转、缩放、平移等几何攻击均具有较好的鲁棒性。

Aiming at the problem that existed digital image watermark method lacks of enough robust to geometrical transform attacks, this paper proposes a novel digital watermark method based on Digital Wavelet TransformtDWT）. The DWT is utilized to transform the image, and the digital watermark is embedded into the low frequency subband. The watermark detection is implemented by determine images＇ invariant moments. Since these moments are invariant to rotation, scaling and translation transforms, this method is robust to geometrical transform attacks. Simulation experimental results show this method is robust to adding noise, filtering, JPEG compression attacks and RST transforms.