一种基于DCT变换的数字水印算法及其稳健性研究

近年来,数字水印技术已经广泛应用于数字图像、音频、视频等多媒体产品的版权保护。基于离散余弦变换(DCT)的自适应数字水印算法因其优异的性能而广泛采用。首先介绍了数字水印的特点、分类和一般模型,并应用Matlab语言实现了一种基于离散余弦变换(DCT)的数字水印嵌入、提取算法,并探讨各种攻击方式,给出运行结果。实验结果显示,嵌入的水印具有不可见性,而且对于常见的比例缩放、抖动、旋转、滤波、噪声和裁剪攻击具有良好的稳健性。

Research on a Digital Watermarking Algorithm Based on DCT and Its Robustness

In recent years,digital watermarking has been widely used in copyright protection for digital image,audio,video or multimedia products.Algorithm of image watermarking based on DCT had been widely used because of its excellent characteristics.In this paper,The characteristics,classifications and the processing model are first introduced,and the algorithm on embedding and extracting of digital watermarking based on Discrete Cosine Transform(DCT) is implemented on Matlab platform.Finally,the ways of attack are discussed.The simulation experimental results show that the watermarking is invisible and is effectively robust against various image processing operations such as scaling,dithering,rotation,filtering,noise,cropping and so on.