一种基于小波变换的图像数字水印

An image digital watermarking algorithm based on digital wavelet transform

提出一种在图像小波变换域的低频分量上自适应地嵌入二值水印的算法,其特点是充分利用人类视觉特性实现数字水印嵌入强度的自适应调节,同时,水印图像在嵌入前进行置乱加密以提高算法的安全性。在检测时采用盲检测技术。实验结果表明,该水印算法能够抵抗常规图像处理的攻击,具有较好的不可见性和稳健性,能够有效地保护数字图像。

This thesis discusses a new adaptively embedding binary watermarking algorithm on the low-frequency band of the wavelet transfer filed of the image. In this method, the embedding intensity can be adaptively set according to the human visual system. To ensure the security of the watermark, the watermark is scrambled before embedding. Blinding detecting watermarking is also proposed in this thesis. Simulation results prove that embedding watermarking has the characteristics of better invisibility and robustness and can effectively protects digital image.