- 學位論文
以影像編碼殘差資訊為基礎之H.264錯誤隱藏演算法
Error Concealment Algorithm of H.264/AVC Using Encoding Residual Information
摘要
以動作向量為基礎的錯誤補償演算法是利用預估的動作向量去做動態補償，以達到復原遺失區塊的目的。傳統上，為了復原遺失的區塊所預估的動作向量，通常是直接利用鄰近可獲得的動作向量去做預測。在本論文中，我們提出利用影像串流中的編碼殘差資訊去估測相對應的動作向量的可靠性。為了能更進一步改善最近提出的編碼動作向量與推測動作向量的相關數學方程式，編碼殘差資訊作為權重被分別應用在不同的種類的動作向量中。我們所提出的利用影像編碼殘差資訊的錯誤補償演算法，在一系列的測試影片中，效能最高可勝過最先進的錯誤補償演算法高達2.12dB。
並列摘要
Motion-vector-based error concealment algorithms recover the lost blocks by motion compensation with the estimated motion vectors. Traditionally, the estimated motion vectors for the lost block are derived by the direct usage of the neighboring available motion vectors. In the proposed paper, the residual signal in a block encoded in the video bitstream is used to measure the reliability of the corresponding motion vector. The residual information is applied to weight the neighboring available motion vectors differently, to further improve a newly proposed mathematical formulation between encoded motion vectors and the extrapolated motion vectors. The proposed error concealment method using the residual information outperforms a state-of-the-art error concealment algorithm by up to 2.12 dB in sequence PSNR.