一维正态云模型水印研究

Research on the Normal Cloud Model Watermarking

将云模型理论引入数字水印领域,提出一种采用给定参数的一维正态云序列作为水印信息,将云水印嵌入到数字图像DCT较大系数中的水印算法。在算法的鲁棒测试中,提出采用云相似性度量算法对水印序列进行定性判定的方法。仿真实验结果表明,将云模型及其相关理论引入数字水印领域是完全可行的,遭受攻击后提取出的云水印,即使部分云滴改变,仍然可以根据云水印的3个特征参数,使用相似云判定算法对其进行定性的判定。

Cloud model is introduced in the filed of watermarking in this paper,one-dimensional normal cloud is used as watermarking sequence and be embedded into image＇s larger DCT coefficient.The theory of similar cloud and its measurement is introduced to test the robustness of the proposed scheme.Cloud model and its related theories are successfully applied in the field of watermarking by the experimental data.Even though some drops of the cloud are varied by image processing,we can draw the qualitative conclusion of extracted cloud sequence by calculating similarity with three characteristic parameters and similar cloud algorithm.