基于提升小波和纹理块的图像自适应水印算法

An Image Self-adapting Watermarking Algorithm Based on Lifting Wavelet and Texture Blocks

图像以提升小波和纹理块为基础,提出一种新的可以抵抗噪声攻击和几何变换的数字图像水印算法。首先利用混沌原理对水印信息置乱加密,通过检测宿主图像提升小波分解后低频子带的纹理特性以及已加密的水印信息量大小,自适应地确定出水印在低频子带的嵌入强度,可以有效地提高数字图像水印的性能。实验结果表明方法可以抗击剪切、噪声和滤波等攻击,具有较好的安全性、鲁棒性和不可见性。

A new digital image watermarking embedded algorithm based on lifting wavelet and texture blocks was presented. The authors scramble and encrypt the watermarking information based on chaos principle firstly, then research the texture blocks in the low frequency bands of wavelet coefficients of the original image and the distribution of quantity of watermark information. It can decide the watermarking intensity embedded in the low frequency bands of wavelet coefficients of the original image in an adaptive manner, and it improves the performance of digital watermarking effectively. The experimental results show that the algorithm is secure, robust and imperceptible, can resist the original image process attacks such as cropping, noise and filtering etc.