基于混沌和图像融合的自适应数字水印算法

提出了一种基于混沌和图像融合原理的自适应数字水印算法.该算法利用混沌映射将水印图像进行置乱预处理,求出载体图像的噪声可见性函数NVF,然后将载体图像的NVF函数作为乘法因子,使载体图像和水印图像融合,可自适应地调节水印信息的强度,并将其隐藏在载体图像中.从信息论的角度对试验结果进行了评价,试验结果表明:该算法提高了隐藏的视觉效果,既保证了水印的安全性,又提高了水印的鲁棒性.

Adaptive digital watermark algorithm based on chaos and image fusion

An adaptive digital algorithm based on the chaos and image fusion principle was proposed.The watermark image was scrambledly pretreated using chaos map,and then the noise visibility function(NVF) of the carrier image was obtained.The carrier image and the watermark image was fused using the NVF of carrier image as fusion-factor for improving the strength of the watermark information adaptively and hiding the information in carrier image.The experimental results were evaluated from the point of information theory.The results show that visual effect of hiding was improved,security of the watermark was guaranteed and robustness of the watermark was improved.