一种基于混沌映射的鲁棒性图形水印算法

提出了一种基于混沌映射的DCT域数字图像水印算法。将含有特定信息的二值序列作为原始水印，利用混沌密码对其进行加密，并在嵌入时再利用混沌映射将水印信息嵌入原始图像的DCT域，使得水印方案具有双重安全性。由于在水印检测时不需要原始图像的参与，该算法实现了水印的盲检测。实验结果表明，用该算法嵌入的水印信息具有不可见性，其对常见的图像处理如JPEG压缩、噪声、滤波以及剪切等具有良好的鲁棒性。

An Robust Image Digital Watermarking Algorithm Based on Chaotic Mapping

A chaotic encrypted image digital watermarking algorithm based on DCT domain is proposed. A specific binary sequence as the original watermarking information is designed and encrypted by a chaotic sequence cipher before it is embedded. By means of chaotic diffusing, the watermark is embedded into the DCT domain of the original image, which makes the watermarking algorithm have double security. Because the original image is not needed in the detection, the algorithm realizes the blind detection. The experimental results show that the watermarks are invisible and robust against commonly used image processing methods such as JPEG compression, noise, filter and crop processions etc.