摘要
关于保护版权,研究数字图形水印优化问题,由于水印隐蔽性得不到保护,针对传统水印算法不能解决水印隐蔽性与抗攻击性间矛盾的难题,提出了小波变换的数字水印算法。利用人类视觉特性,将水印图像进行置乱预处理,提高水印的抗攻击性,然后原始图像进行两级小波分解,提高水印的隐蔽性,最后将水印嵌入小波变换系数中去,实现图像水印的嵌入。仿真结果表明,数字图像水印方法能抵抗各种几何攻击,且水印具有很好的隐蔽性,很好地解决水印隐蔽性与抗攻击性间的矛盾,对数字图像版权实现很好的保护作用。
Study on the image digital watermark optimization problems.Because the traditional watermark algorithms have the contradiction between invisibility and robust,a watermark algorithm is proposed based on wavelet transform which uses the human visual characteristics and wavelet transform of multi-resolution decomposition characteristics.Firstly,the watermark image is scrambled,then human vision characteristics of watermark image quantized compensation and embedded wavelet transform coefficient are used in wavelet domain watermark embedding and extracting.Simulation results show that this algorithm solves the contradiction between invisibility and robustness,and it suitable for the copyright protection of digital images.
出处
《计算机仿真》
CSCD
北大核心
2011年第6期292-295,共4页
Computer Simulation
关键词
数字水印
小波变换
人类视觉系统
Digital watermark
Wavelet transform
Human visual system
