摘要
针对水印算法中存在的不可见性和鲁棒性之间的矛盾,提出了一种新的水印算法。该算法一方面综合考虑人类视觉特性和JPEG压缩原理选择恰当的嵌入位置,利用所选系数对的大小关系嵌入水印;另一方面自适应地对嵌入水印后相应位置的DCT系数进行增强处理,从而使水印具有良好的不可见性,又大大增强了水印的鲁棒性,且可实现盲检测。具体分析了不可见性和抗JPEG压缩性能与水印嵌入强度的关系,理论分析及实验表明该算法能够有效的抵抗JPEG压缩、噪声、滤波、剪切等各种攻击,具有较好的实用价值。
In this paper,a novel watermarking algorithm is proposed,which aims at the contradiction between invisibility and robust-ness. First,a pair of positions is selected considering the characteristic of HVS and the principle of JPEG compression; then the wa-termark is embedded using the relationship of coefficients on the selected positions; finally,the coefficients are enhanced adaptively. The scheme improves the invisibility and robustness of the watermark. It also realizes blind detection. The relationships between em-bedding intensity and invisibility together with anti-JPEG compression are analysed. The theory and experiment show the algorithm can survive JPEG compression,noise,filtering,clipping and other attacks,which is practical.
出处
《微计算机信息》
北大核心
2008年第36期66-68,共3页
Control & Automation
基金
陕西省国际科技合作重点项目--数字内容综合防护系统(2006KW-21)
