摘要
为保证水印的不可见性和鲁棒性,提出了一种有效的基于水印DWT的数字图像水印算法。该算法首先利用Arnold置乱和Logistic混沌系统对水印进行加密,增强水印系统的安全性。然后结合人类视觉系统选取DWT变换系数,并通过对系数的改变实现水印的嵌入。实验结果表明,该算法对剪切、中值滤波、噪声、JPEG压缩等操作具有较强的鲁棒性。
In order to ensure the concealment and robustness of watermark, a digital image watermark algorithm based on DWT was proposed . Firstly, the watermark was encrypted by Arnold scratch and Logistic chaotic system in order to enhance the security of watermark system. And then comparing HVS, transforming coefficients of DWT were elected, and watermark was embedded by changing transforming coefficients. The experiment results show that the algorithm has a good robustness for some image processing operations such as clipping, median filtering, noise, and JPEG compression.
出处
《辽宁石油化工大学学报》
CAS
2007年第1期63-66,共4页
Journal of Liaoning Petrochemical University
关键词
数字水印
混沌序列
小波变换
密钥
Digital watermark
Chaotic sequences
Wavelet transformation
Secret key
