基于小波变换的图像自适应公开水印技术

Image-adaptive public watermarking technique based on DWT

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。

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.