基于变换域的数字水印技术

数字水印技术是将信息隐藏从而实现多媒体数据的版权保护,数字水印的研究主要是所提出的算法具有更好的不可见性和鲁棒性。提出了2种不同的变换域方法:一种是基于DCT域的水印算法,水印信息取自二值签名图像;另一种是基于小波分解的数字水印算法,采用服从高斯分布的随机数作为水印信息。实验结果表明,这2种水印算法具有良好的性能,实现的水印具有不可见性,而且对于常见的图像处理具有很好的鲁棒性。

Digital Watermarking Techniques Based on Transform Domain

The purpose of digital watermarking technology is to realize the multimedia data copyright protection by hiding the information.The algorithm proposed in the digital watermarking research has better invisibility and robustness.In this paper,two different watermarking techniques are proposed.One is in the DCT domain and watermark information is a binary image;the other is based on wavelet transform and watermark information is random numbers produced by Gauss distribution.Experimental results demonstrate that the two watermarking algorithms have better effect:The watermark is invisible and robust against common image processing.