A real-time robust digital fingerprinting algorithm

As a branch of digital watermarking, digital fingerprinting, a technology being used to trace the leakage of the multimedia content, has become a hot topic in recent years. As users increase, a practical fingerprinting system has the following requirements, such as robustness, collusion-resistance, and realtime processing. To lower the computational complexity of fingerprint embedding, we propose a spatial-domain based large scale 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 efficacy is the same as 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 transformations are needed for video frames or images during the process of fingerprint embedding. The experimental results show that the proposed algorithm has many advantages in real-time processing and robustness.