摘要
为了提高图像数字水印算法的实用性、顽健性及不可感知性,提出了一种改进的应用遗传算法的水印嵌入和提取方法。通过在DCT变换域中修改AC系数嵌入水印,可以提高嵌入速度,避免水印信息的损失;采用改进的遗传算法选择AC系数,同时优化嵌入水印后图像质量和顽健性这两个矛盾的因素。仿真结果表明,算法具有良好的抗攻击能力和不可感知性,节省约1/3的时间,提高了程序运行效率。
In order to increase the speed of genetic watermark and improve the robustness and imperceptible of the algorithm, a new embedding and extracting method with genetic algorithm （GA） is proposed. The AC coefficients of image in DCT domain are modified to embed the watermark. The proposed embedding and extracting method is employed to accelerate the genetic watermark so that genetic watermark could be used in practice. The improved GA is used to optimize both the fundamentally conflicting requirements： robustness and invisibility. The experimental results show both the good robustness under attacks and the high fidelity. The time needed to perform the program is greatly decreased. About 1/3 time is saved.
出处
《计算机工程》
CAS
CSCD
北大核心
2007年第17期146-148,共3页
Computer Engineering
基金
国家发改委高技基金([2005]2247)
关键词
数字水印
遗传算法
离散余弦变换
适应度函数
digital watermark
genetic algorithm （GA）
discrete cosine transform （DCT）
fitness function
