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Rate control for non-uniform video in HEVC

机译:HEVC中非均匀视频的速率控制

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摘要

Rate control plays an important role in video coding, and most of the existing rate control schemes are based on the assumption that the video contents are uniform. However, for non-uniform video applications, such as screen content videos and movies, previous rate control schemes may cause severe quality degradation, since the bit allocation strategy is improper and the rate-quantization (R-Q) model parameters may extremely inaccurate. In this paper, firstly an adaptive bit allocation algorithm is proposed for the newest video coding standard high efficiency video coding (HEVC), next a key frame detection method is presented, and finally an accurate intra R-Q model, a model parameter adjusting strategy and a bit feedback strategy are developed for the scene change frame. Experimental results show that the proposed rate control method could achieve more accurate bitrates and better rate-distortion (R-D) performance than previous rate control methods. (C) 2017 Elsevier Inc. All rights reserved.
机译:速率控制在视频编码中起着重要作用,并且大多数现有的速率控制方案都是基于视频内容是统一的假设。但是,对于非均匀视频应用(例如屏幕内容视频和电影),以前的速率控制方案可能会导致严重的质量下降,因为位分配策略不正确并且速率量化(R-Q)模型参数可能非常不准确。本文首先针对最新的视频编码标准高效视频编码(HEVC)提出了一种自适应比特分配算法,其次提出了一种关键帧检测方法,最后提出了一种精确的帧内RQ模型,一种模型参数调整策略和一种自适应算法。针对场景变化框架开发了比特反馈策略。实验结果表明,所提出的码率控制方法比以前的码率控制方法可以获得更准确的比特率和更好的码率失真(R-D)性能。 (C)2017 Elsevier Inc.保留所有权利。

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