基于空域的鲁棒数字指纹实时嵌入算法

Real-time Robust Embedding Algorithm Based on Spatial Domain for Digital Fingerprinting

数字指纹技术,作为数字水印的一个分支,主要用于对作品的盗版源头进行追踪,近几年成为一个研究热点。随着指纹应用的用户规模不断扩大和视频指纹应用的需要,系统对指纹算法的要求也逐渐提高,比如鲁棒性、抗共谋能力和实时处理性等,这些都是当前的研究难题。为了降低计算复杂性,该文提出了一种空域的鲁棒数字指纹实时嵌入算法。首先将指纹转化成模板,然后通过模板叠加的方式嵌入数字指纹。嵌入处理过程非常简单,可以适用于任何格式视频和图像。尽管在空域叠加嵌入指纹,但算法本质上等同于在DFT(离散傅里叶变换)域嵌入水印,因此指纹的鲁棒性得以保证。与传统的变换域算法相比,所提的算法不需要对嵌入载体(视频帧或图像)进行变换,因此实时性非常好。实验进一步验证了该算法在实时处理性和鲁棒性上的优势。

As a branch of digital watermarking technology,digital fingerprinting is used to trace the leakage of the multimedia content.It becomes a hot topic in recent years.Because of the increase of users and the requirements of video fingerprint application,the fingerprinting system calls for improvements in fingerprint algorithm,such as robustness,collusion-resistance,and real-time processing,which are problems in current research.To lower the computational complexity of fingerprint embedding,we propose a spatial-domain based robust real-time embedding algorithm in this paper.At first,the fingerprints are converted into an embedding template.And then,the template is superimposed to the host signal directly in spatial domain.The proposed embedding algorithm is simple and efficient, and it could be used in various types of multimedia data.Though the fingerprint template is added in spatial domain,the efficiency is equivalent to that of the methods in DFT（Discrete Fourier Transform） domain.Therefore,the robustness can be maintained.Comparing with the traditional algorithms in transform-domain,the proposed algorithm performs much better in real-time processing.This is because that no transformation is needed for video frames or images during the embedding process of the fingerprints.The experimental results show that the proposed algorithm has many advantages in real-time processing and robustness.