计算机工程 ›› 2009, Vol. 35 ›› Issue (18): 151-153.doi: 10.3969/j.issn.1000-3428.2009.18.053

• 安全技术 • 上一篇    下一篇

基于中值滤波的小波域水印算法

温泉秀,杨建伟   

  1. (南京信息工程大学数理学院,南京 210044)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-09-20 发布日期:2009-09-20

Wavelet Domain Watermark Algorithm Based on Median Filtering

WHEN Quan-xiu, YANG Jian-wei   

  1. (College of Mathematic and Physics, Nanjing University of Information Science and Technology, Nanjing 210044)
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-09-20 Published:2009-09-20

摘要: 提出一种小波域鲁棒图像水印算法,水印信息被嵌入小波变换的低频子带。为检测对视觉不敏感的离散小波变换低频系数,将小离散波变换的低频子带进行中值滤波,并与原小波变换低频子带的小波变换系数比较,对变化程度小的系数嵌入水印信息。实验结果表明,该算法与基于小波低通滤波的水印算法相比,保证不可见性,对压缩、中值滤波、剪切、锐化等具有更强的鲁棒性。

关键词: 数字水印, 离散小波变换, 中值滤波, 低频子带

Abstract: This paper proposes a robust digital watermark algorithm based on Discrete Wavelet Transform(DWT) to embed digital watermark into low frequency sub-image. In order to detect low frequency coefficients of DWT which insensitive to visibility, it makes low frequency sub-band median-filted and compared with original low frequency, and embeds the watermark into small changes of the cofficients. The paper compares the proposed algorithm with the watermark algorithm based on the low-pass filtering. Experimental results shows that the algorithm not only ensures the invisibility but also ensures the stranger roubust to compress, median-filter, crop, sharpen, etc.

Key words: digital watermark, Discrete Wavelet Transform(DWT), median filtering, low frequency area

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