摘要
为提高扩频水印的抗图像剪切能力,提出一种基于面包师的扩频水印算法。该算法首先利用面包师变换对水印图像进行置乱;再通过一组伪随机序列对置乱后的图像进行扩频,可得到具有抗剪切攻击能力的水印序列;最后将水印序列嵌入到载体图像DCT域中低频段部分,完成水印的嵌入。水印检测时,对载体图像分别进行不同面积的剪切,计算出提取的水印图像与原始水印图像的相关值。实验结果证明,该算法不仅能够抵抗大面积的图像剪切,同时对其他攻击方法也能够表现出良好的鲁棒性。
In order to improve the ability resisting image-cropping of spread spectrum watermarking,this paper proposed a new spread spectrum watermarking algorithm based on baker＇s transformation.First,it did baker＇s transform of the watermarking image to scramble it,then spread the image with a PN sequence so that it could get a watermarking sequence with the ability resisting image-cropping.In the end embed the sequence into the low frequency band of the carrier image DCT domain to complete the embedding process.When checking the watermarking,cropped different area of the carrier image and calcula-ted the correlation value between the extracted watermarking image and the original image.The experimental result demonstrates that the algorithm can not only resist large area cropping,but also manifest a good robustness when facing other attacking methods.
出处
《计算机应用研究》
CSCD
北大核心
2012年第6期2246-2248,共3页
Application Research of Computers
基金
辽宁省重点实验室资助项目(2009S051)
关键词
扩频水印
面包师变换
抗剪切
离散余弦变换
spread spectrum watermarking
baker＇s transformation
resist cropping
DCT
