彩色图像DCT域鲁棒性公开水印算法  

A Robust Image-Adaptive Public Watermarking Algorithm based on Discrete Cosine Transformation for Color Image

作　　者：李新友[1] 

机构地区：[1]河北旅游职业学院,河北承德067000

出　　处：《河北旅游职业学院学报》2015年第4期94-96,共3页Journal of Hebei Tourism College

摘　　要：本文提出了一种对彩色图像的基于分块离散余弦变换(DCT)的鲁棒性图像自适应公开水印。在充分考虑HVS掩蔽特性的基础上,结合选取的DCT系数本来的值,根据转化成0,1序列的水印信息是0或1,来修改这些系数属于的奇偶范围,自适应地嵌入水印信号。在提取水印时,不需要原始图像,完全实现了盲水印提取。通过修改自定义的参数,可以在水印透明性与鲁棒性之间找到最佳取舍点。实验结果表明,该算法具有较大的容量,对通常的图像处理操作,如裁剪,JPEG压缩,添加高斯噪声等都具有很好的鲁棒性。A robust image-adaptive public watermarking technique based on discrete cosine transformation for color image is proposed in this paper. By taking full advantage of the masking characteristics of the human visual system, a binary watermark is embedded into the host image by modifying different corresponding cosine coefficients’ value to the nearest odd area or even area. The blind watermark is realized as the original image which isn’t needed when extracting watermark. Modifying some parameters can get a best point. The experimental results show that the proposed algorithm provides higher embedding capacity and robust to common image processing operations, such as shearing, encapsulate of JPEG, adding Gaussian noise and etc. So a conclusion can be drawn that the proposed technique is practical.

关 键 词：离散余弦变换 公开水印技术 人类视觉系统 奇偶判决法 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]