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.
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
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
discrete cosine transformation
public watermarking technique
human visual system
odd-even adjudgement rule
