Runtime-optimised intra-4×4 mode-decision for H.264/AVC video encoding

Harald Jordan, F. Seitner, M. Bleyer, M. Gelautz
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引用次数: 1

Abstract

We describe a method that considerably improves the computational behaviour of H.264 intra-only encoders. Such intra-only encoders come to use in video-cutting and low-latency video coding where temporal prediction via using inter-frames is no feasible option. We identify the spatial prediction step as the computational bottleneck in intra-only encoders. In this step, the encoder tests various modes that represent predictions of the current macroblock's or sub-macroblock's texture from spatial neighbouring pixels in order to find the mode of lowest residuum. Unfortunately, testing the complete set of allowed modes is computational expensive. However, as is demonstrated by an analysis provided in this paper, it is reasonable to assume that a large percentage of blocks preserve their prediction modes over time. Based on this assumption we develop two algorithms that improve the computation time in the prediction step. These algorithms differ by their criteria used to decide whether a block's coding mode can be propagated from a temporal preceding frame. Computational speed is enhanced, since we test the full set of modes only for blocks that fail these criteria. Experimental results show that our methods considerably improve the execution time of an intra-only encoder and only show small impact on data-rate and image quality.
运行时优化intra-4×4模式决策的H.264/AVC视频编码
我们描述了一种方法,大大改善了H.264内部编码器的计算行为。这种内部编码器用于视频切割和低延迟视频编码,其中通过使用帧间进行时间预测是不可行的选择。我们认为空间预测步骤是单内编码器的计算瓶颈。在这一步中,编码器测试各种模式,这些模式表示当前宏块或子宏块的纹理从空间邻近像素的预测,以找到最低残差的模式。不幸的是,测试允许模式的完整集合在计算上是昂贵的。然而,正如本文提供的分析所证明的那样,假设大部分区块随着时间的推移保持其预测模式是合理的。基于这一假设,我们开发了两种算法来提高预测步骤的计算时间。这些算法的不同之处在于它们用于决定块的编码模式是否可以从时序前帧传播的标准。计算速度得到了提高,因为我们只对不符合这些标准的块测试全套模式。实验结果表明,我们的方法大大提高了单内编码器的执行时间,对数据速率和图像质量的影响很小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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