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首页> 外文期刊>Journal of visual communication & image representation >VLC/FLC data partitioning with intra AC prediction disabled
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VLC/FLC data partitioning with intra AC prediction disabled

机译：禁用内部AC预测的VLC / FLC数据分区

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摘要

Compressed video bit stream is very sensitive to transmission errors, due to error propagation resulting from variable-length coding, differential coding, and motion compensated prediction. There exist many error-resilient techniques that can significantly improve the reconstructed video quality by reducing the spatial and temporal error propagation. In this paper, an error-resilient coding scheme that can limit the spatial error propagation with little overhead is proposed. It disables intra AC prediction and groups appropriate fixed length coded (FLC) syntaxes in a video packet (or slice) together to form a new partition. With intra AC prediction disabled, errors occurred in these FLC syntaxes will not cause spatial error propagation. This error resilient coding scheme essentially classifies the syntaxes into two categories according to whether that syntax will cause spatial error propagation when an error occurs. We evaluate the efficiency of the error-resilient coding scheme by comparing the reconstructed PSNR of the proposed coding scheme with that of the MPEG-4 coding scheme over the AWGN channel and the Rayleigh channel. Depending on the video sequence, channel coding rate and channel condition, our proposed data-partitioning scheme can achieve up to 1.8 dB PSNR gain.
机译：由于可变长度编码，差分编码和运动补偿预测导致的错误传播，压缩的视频比特流对传输错误非常敏感。存在许多错误恢复技术，这些技术可以通过减少空间和时间错误传播来显着提高重建的视频质量。在本文中，提出了一种可以在不增加开销的情况下限制空间错误传播的防错编码方案。它禁用内部AC预测，并将视频数据包（或片）中的适当的固定长度编码（FLC）语法分组在一起，以形成新的分区。禁用内部AC预测后，这些FLC语法中发生的错误将不会导致空间错误传播。根据在发生错误时该语法是否会引起空间错误传播，该抗错误编码方案实质上将语法分为两类。通过比较在AWGN信道和Rayleigh信道上提出的编码方案的重构PSNR与MPEG-4编码方案的重构PSNR，我们评估了防错编码方案的效率。根据视频序列，信道编码率和信道条件，我们提出的数据划分方案可以实现高达1.8 dB的PSNR增益。

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