3D小波变换的抗裁剪鲁棒数字图像水印算法

为解决抗裁剪的鲁棒数字水印问题,提出了一种基于3D小波变换的数字水印算法.该算法根据离散小波变换理论和对视频序列进行3D小波变换的研究结果,将原图像拆分为一个图像视频帧,将水印自适应地加入到每个图像帧二维小波变换中频域的不同位置,利用图像二维小波变换中频域的特性和人类视觉系统特性,大大提高了水印算法的有效性,对严重的裁剪攻击具有很强的抗攻击性,在图像被裁剪一半以上情况下仍能非常清晰地得到水印.实验表明,该水印算法对图像裁剪有很强的鲁棒性.

Robust digital image watermarking against shearing based on 3D wavelet transform

In order to achieve robust digital image watermark against shearing,the 3D wavelet transform based robust watermark casting scheme against shearing attack for digital images was introduced. Based on the characteristics of the image theory and human visual system, the proposed method make use of the three-dimensional wavelet transform to split the image to a sense of image videos and the watermark is adaptively weighed to the different positions of the middle frequency region. The method makes use of the characteristics of image two-dimensional wavelet transform and validity of water marking and shows excellent advantage against shearing attack. The method could show the watermark clearly when half of the image has been cut. Experimental results show the excellent robustness of this method for image shearing.