Simulation and Analysis of Digital Video Watermarking Using MPEG-2

摘要

Quantization Index Modulation (QIM) is an important method for embedding digital watermark signal with information. This technique achieves very efficient tradeoffs among watermark embedding rate, the amount of embedding induced distortion to the host signal and the robustness to intentional or unintentional attacks. Most of the schemes of video watermarking have been proposed on uncompressed video. This paper introduces a compressed video watermarking procedure to reduce computations. In a video frame the luminance component is an important factor where much change can not be made as it can disturb the original data. The MPGE-2 video compression technique is based on a macroblock structure, motion compression and conditional replenishment of macroblocks. To achieve high compression motion compensation employed with P-frames, the Discrete Cosine Transformation (DCT) always exists in video stream for high robustness. In this work the QIM technique used for embedding is the DC component of chrome DCT of P-frames. The robustness of the proposed method has been studied through simulation.