一种基于小波域中视觉门限模型的灰度数字水印算法

数字水印技术作为数字产品版权保护的一项新技术,已受到越来越多的关注。为保证水印的鲁棒性,利用人类的视觉特性,文章提出一种基于离散小波变换数字水印技术,并给出了攻击分析。其中,采用灰度图像作为数字水印,具有二维信号可视化的优点。实验表明,该算法能够经受住噪声、高斯滤波、压缩、直方图均衡化、增加对比度等的处理,具有较强的鲁棒性,是一种行之有效的水印嵌入方法。

Gray-level Image Watermarking Algorithm Based on a Visual Model Using DWT

As a new technique applying to protect the copyright of digital productions,the digital watermark techniquehas drawn extensive attention.A digital watermarking algorithm based on discrete wavelet transform (DWT) is pre-sented in consideration of human visual properties.Then, some attack analyses are given.At the same time,gray-levelimage is used as digital watermarking, which has the advantage of visualization.The experiments demonstrates thatthe watermarking is robust to the common signal processing techniques including compressing,noise,gauss filter,image enhancing and so on.So it is effective.