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Recovering Connected Error Region Based on Adaptive Error Concealment Order Determination

机译：基于自适应错误掩盖顺序确定的连接错误区域恢复

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摘要

Parts of compressed video streams may be lost or corrupted when being transmitted over bandwidth limited networks and wireless communication networks with error-prone channels. Error concealment (EC) techniques are often adopted at the decoder side to improve the quality of the reconstructed video. Under the conditions of a high rate of data packets that arrives at the decoder corrupted, it is likely that the incorrectly decoded macro-blocks (MBs) are concentrated in a connected region, where important spatial reference information is lost. The conventional EC methods usually carry out the block concealment following a lexicographic scan (from top to bottom and from left to right of the image), which would make the methods ineffective for the case that the corrupted blocks are grouped in a connected region. In this paper, a temporal error concealment method, adaptive error concealment order determination (AECOD), is proposed to recover connected corrupted regions. The processing order of an MB in a connected corrupted region is adaptively determined by analyzing the external boundary patterns of the MBs in its neighborhood. The performances, on several video sequences, of the proposed EC scheme have been compared with those obtained by using other error concealment methods reported in the literature. Experimental results show that the AECOD algorithm can improve the recovery performance with respect to the other considered EC methods.
机译：通过带宽受限的网络和具有易错通道的无线通信网络传输时，压缩视频流的一部分可能会丢失或损坏。在解码器侧通常采用错误隐藏（EC）技术来提高重建视频的质量。在到达解码器的数据包速率很高的情况下，错误解码的宏块（MB）可能集中在丢失重要空间参考信息的连接区域中。常规的EC方法通常在词典扫描之后（从图像的顶部到底部以及从左到右）执行块隐藏，这将使该方法在损坏的块被分组在连接区域的情况下无效。本文提出了一种临时错误隐藏方法，即自适应错误隐藏顺序确定（AECOD），以恢复连接的损坏区域。通过分析其附近的MB的外部边界模式，可以自适应地确定连接的损坏区域中的MB的处理顺序。拟议的EC方案在几个视频序列上的性能已与文献中报道的使用其他错误隐藏方法获得的性能进行了比较。实验结果表明，相对于其他考虑的EC方法，AECOD算法可以提高恢复性能。

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