Semi-fragile Watermarking Algorithm for Detection and Localization of Temper Using Hybrid Watermarking Method in MPEG-2 Video

In this paper, a novel semi-fragile watermarking adapted to MPEG-2 video is proposed. It is achieved by using the hybrid watermarking method which is implemented by the combination of the robust watermark applied in DCT and spatial domain and the fragile watermark applied in motion vector. The proposed method can not only detect attacks but also localize them. Besides, it can distinguish malicious attacks such as frame dropping or swapping from non-malicious tempers like re-compression. This method satisfies invisibility and does not need the original information for the watermark detection.