| Summary: | 碩士 === 國立東華大學 === 資訊工程學系 === 94 === H.264/AVC is a novel video codec standard. This new standard can provide a better coding efficiency than other previous video coding standard. Since digital video codec technology grows so rapidly, many multimedia applications develop using H.264. When burst errors occur, however, bit stream can not be successfully decoded and video quality will be destroyed by errors blocks. This results is a serious problem, when feedback task can not be done by system, like HDTV, broadcast TV, Internet broadcast video, … etc.. Therefore, the error resilience or concealment is an important research issue.
Information embedding causes the damage of the original image for traditional error resilient techniques. If no error occurs, the quality resulting from the traditional error resilient techniques is not the same as original image. Reversible data embedding is an important technique nowadays. Moreover, the reversible data embedding using difference expansion is a simple and effective algorithm.
In this thesis, we address the error resilience using a reversible data embedding technique. The algorithm is stretchy that user can make a trade-off between the quality of recovery image and DCT coefficients’ variation. The advantage of reversible data embedding is that if the transmission is error-free, the image quality in the encoder can be exactly recovered as done by H.264 in the decoder. Simulation results demonstrate that the proposed method makes the video coding sequence more robust.
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