基于图像插值和直方图平移的可逆水印算法

摘要

The existing reversible watermarking algorithm based on histogram translation has the problem of low embedding ca-pacity.This paper presented a new algorithm combined with the feature of image pixels after amplifying.It was not only in-creased the number of pixels,but also enhanced the correlation among the pixels by amplifying the picture 4 times with inter-polation.It calculated the vertical and horizontal pixels to obtain prediction error value and construct histograms,then embed-ded watermark information at the peak of histograms.It extracted the watermarking in the reverse process and recovered the o-riginal image according to the principle of interpolation.The experimental results show that the embedding capacity has in-creased by 3 times after being amplified.The presented algorithm shows better invisibility and larger embedding capacity,and also can be applied to the domain of image hiding and information security.%现有的基于直方图的可逆水印算法嵌入容量较少，针对这一问题，结合图像放大后像素点的特征，提出一种新的可逆水印算法。利用插值方法将图像放大4倍，既增加了图像的像素个数，又增强了像素之间的相关性；使用上下左右四个像素点计算像素点的预测误差值，并构造直方图，在峰值点处嵌入水印信息；利用相反的过程提取水印，并根据插值原理恢复原始图像。实验结果表明，将图像放大后再嵌入水印，可嵌入水印容量提高了3倍；算法不可见性较好、嵌入容量较大，可用于图像隐藏、信息安全等领域。