计算机应用 ›› 2005, Vol. 25 ›› Issue (10): 2342-2344.

• 图形图像处理 • 上一篇    下一篇

基于小波变换的图像自适应公开水印技术

张宪海，杨永田   

  1. 哈尔滨工程大学计算机科学与技术学院
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2005-10-01 发布日期:2005-10-01

Image-adaptive public watermarking technique based on DWT

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  1. School of Computer Science and Technology,Harbin Engineering University,Harbin Heilong Jiang 150001,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2005-10-01 Published:2005-10-01

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摘要： 提出了一种鲁棒的基于分块离散小波变换（DWT）的图像自适应公开水印技术。在充分考虑HVS掩蔽特性的基础上，利用不同分解层次小波系数块相关的特点，通过修改相应小波系数块之间的关系，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和几何攻击等都具有较强的鲁棒性。

关键词: 离散小波变换, 零树, 人类视觉系统, 公开水印技术

Abstract: A robust image-adaptive public watermarking technique based on discrete wavelet transform(DWT) was proposed in this paper.By taking full advantage of the masking characteristics of the human visual system(HVS),a binary watermark was embedded into the host image by modifying different wavelet subbands coefficients that were corresponded.The blind watermark was realized as the original image don’t be needed when extracting watermark.Modifying some parameters could get a best point.The experimental results show that the proposed algorithm provides higher embedding capacity and robust to common image processing operations and geometric distortions.So a conclusion can be made that the proposed technique is practical.

Key words: discrete wavelet transformation, zerotree, human visual system, public watermarking technique

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