摘要
目的为得到一种新的鲁棒数字水印算法。方法应用CDMA技术,通过合理选取扩频码以及合理挑选图像子块,实现在图像DCT域嵌入有意义二值图像水印,保证水印的不可见性;充分利用所选取扩频码相关函数的特性,在有原始宿主图像参与的情况下实现水印的快速提取。结果给出了算法的分析和实现步骤,最后的仿真实验表明了算法的有效性。结论与已有方法比较,所得算法可实现较大数据信息的嵌入,并且对于JPEG压缩、噪声、滤波以及中心剪切等操作具有较强的鲁棒性。
Aim In order to get a novel image watermarking algorithm which is robust to many attacks.Methods By choosing reasonable spreading code and appropriate image subblocks,a binary image is embedded to some DCT coefficients,in which CDMA technique is employed,and imperceptibility of watermark is well satisfied;Taking advantage of correlation property of spreading code,watermark is extracted quickly on the precondition on which host image exists.Results The algorithm＇s scheme and analyses are given,The result of emulation shows that this algorithm is correct and effective.Conclusion Compared with traditional method,large quantities of information can be embedded by using this algorithm,and it is robust to standard JPEG compression,noising,filtering and cropping attacks.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2007年第4期569-572,共4页
Journal of Northwest University（Natural Science Edition）
基金
陕西省科技攻关资助项目(2004K05-G25)
