摘要
提出一种基于时空混沌的离散余弦变换域(DCT域)自适应彩色图像水印算法.算法采用时空混沌模型生成混沌序列对二值水印进行置乱加密,同时结合改进的人类视觉模型(HVS)图像块分类方法和彩色图像RGB分量特点确定水印嵌入强度,最后,水印被重复嵌入到彩色图像RGB各个分量DCT中频变换系数中.实验结果表明,该算法对于抵抗各种噪声、滤波和压缩等攻击具有非常好的鲁棒性,在分别遭受压缩比为30%、剪切掉25%的攻击时,仍能提取出相似度为0.914和0.869的水印.
In this paper,a sort of adaptive color image digital watermarking algorithm based on spatiotemporal chaos encryption in DCT domain,is proposed. This algorithm uses spatiotemporal chaos model to generate chaos sequence which is used to throw the binary system watermark into confusion. Then it splits the original image into blocks and classifies these blocks based on HVS and the RGB components characteristic. Finally different intensity watermarks are adaptive embedded into the DCT coefficients of the original image. Experimental results show that this algorithm is very robust against the typical image processing attacks such as noise filtering and compression. For example,when the image is compressed 30% or cut 25% , the watermark of NC 0. 914. 0. 869 respectively can still obtained.
出处
《郑州大学学报（工学版）》
CAS
2007年第2期84-87,共4页
Journal of Zhengzhou University（Engineering Science）
基金
国家自然科学基金资助项目(90204004)
