计算机工程与应用 ›› 2011, Vol. 47 ›› Issue (9): 188-191.

• 图形、图像、模式识别 • 上一篇    下一篇

用于图像认证的小波域量化盲水印算法

马列红,王 冰   

  1. 西北大学 信息科学与技术学院,西安 710127
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2011-03-21 发布日期:2011-03-21

Wavelet domain quantization blind watermarking algorithm for image authentication

MA Liehong,WANG Bing   

  1. College of Information Science and Technology,Northwest University,Xi’an 710127,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-03-21 Published:2011-03-21

摘要: 提出了一种用于图像内容认证的半脆弱水印算法。该算法利用小波变换模极大值提取图像边缘特征,并结合经混沌映射后的小波低频域特征信息生成两个水印。一个主要用于篡改定位,另一个主要用于检测图像的内容篡改。水印嵌入在小波变换的中频域中。水印提取和认证不需要原始水印信息,提高了水印安全性。实验表明,该算法能有效区分偶然失真和恶意篡改,并能定位出篡改发生的位置。

关键词: 图像认证, 半脆弱水印, 小波变换

Abstract: A semi-fragile watermarking algorithm for image authentication is proposed.Edge-character is extracted by finding the maxima of a wavelet transform modulus.Low frequency character is generated by wavelet transform for another watermark.One watermark is used for indicating the modified location and another is used for checking content modification.Watermarks are embedded in the coefficients of middle frequency of wavelet transform.Image authentication and watermark extract need no information about the original watermark.Experimental results show that the proposed algorithm provides good classification of intentional and incidental tampering.

Key words: image authentication, semi-fragile watermark, wavelet transform