计算机应用 ›› 2005, Vol. 25 ›› Issue (04): 853-855.DOI: 10.3724/SP.J.1087.2005.0853

• 信息安全 • 上一篇    下一篇

抗剪切的彩色数字图像盲水印算法

尹德辉1,2,李炳法2   

  1. 1.宜宾学院计算机科学与技术系; 2.四川大学计算机学院
  • 出版日期:2005-04-01 发布日期:2005-04-01

Blind watermarking algorithm for digital color images withstands cutting attacks

YIN De-hui1,2,LI Bing-fa2   

  1. 1.Department of Computer Science and Technology,Yibin University,Yibin Sichuan 644007,China; 2.College of Computers,Sichuan University,Chengdu Sichuan 610064,China
  • Online:2005-04-01 Published:2005-04-01

摘要:

将有意义的二值灰度图像作为水印,采用Arnold变换将水印图像进行置乱,消除像素的 空间相关性,使算法抗攻击的能力(如剪切)得到增强;通过对Arnold变换进行改进,提高了水印的安 全性;在水印嵌入时采用量化的方法,使提取时不需要原始图像。实验证明,算法抗剪切攻击的能力 较强,即使图像剪切大于二分之一,提取水印的视觉效果较好,在JPEG压缩、添加噪声、过滤、锐化、 模糊、添加杂色等多种图像处理和攻击下,仍能提取出清晰的水印图像。

关键词: 离散小波变换, YIQ色彩空间, Arnold变换, 数字水印

Abstract:

 Meaningful binary gray scale images was used as watermarking. Through Arnold transform, the watermarking image was hashed to eliminate the spatial correlation among pixels. Consequently, the algorithm’s ability to withstand attacks (for example cutting) was enhanced. The security of watermarking was enhanced by improving Arnold transform. With a quantification method, the original image is not required for extracting the watermarking. Numerical experiments show that the proposed algorithm is strong in withstanding cutting attacks. Even if more than one half of the image is cut off, the extracted watermarking still has good visual effects. After JPEG compression, adding noises, filtering, sharpening, blurring, contamination, distortion and other image processing or attacks, we can still extract relatively clear watermarking images.

Key words: discrete wavelet transform, YIQ color space, Arnold transform, digital watermarking

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