Spatio-temporal Rate Control Based on a Maximization of a Subjective Assessment Value and Its Application to Video Coding
Spatio-temporal Rate Control Based on a Maximization of a Subjective Assessment Value and Its Application to Video Coding
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基于主观评价值最大化的时空码率控制及其在视频编码中的应用
DOI：
10.3169/itej.62.1785
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Shin'ichi Tanaka
中科院分区：
文献类型：
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作者：
Toshiyuki Yoshida;J. Yamagata;Shin'ichi Tanaka
由于实时视频通信所需的带宽在网络上并不总是可用，因此应适当控制每秒的帧数和单个帧的平均比特量，以便在有限的带宽下获得尽可能高的视频质量。为了解决这个问题，作者开发了一种时空速率控制技术，使MOS的估计值最大化。然而，从实际的角度来看，这种方法在编码参数调优和帧率控制方面自由度很小。尽管针对这些困难提出了改进的技术，但尚未研究时空速率控制下的详细编码算法。因此，本文提出了一种基于MOS估计和帧率控制技术的时空速率控制和视频编码技术，并验证了其有效性。文中还讨论了该技术的一些应用。我们已经确定，与传统的固定帧率方法相比，采用该技术编码的75%的视频具有几乎相同或更好的主观质量。
Since the bandwidth required for real-time video communication cannot always be available on a network, the number of frames per second and the average bit amount for a single frame should be controlled suitably to obtain the highest possible video quality in a restricted bandwidth. To alleviate the problem, the authors have developed a spatio-temporal rate control technique that maximizes an estimation of MOS. From a practical point of view, however, this approach offers little freedom in coding-parameter tuning and in the frame rate control. Although improved techniques have been presented for these difficulties, a detailed encoding algorithm under the spatio-temporal rate control has not been investigated. This paper thus proposes a novel spatio-temporal rate control and video coding techniques based on our MOS estimation and frame rate control techniques, and it shows their validity and effectiveness. Some applications of the proposed technique are also discussed. We have determined that 75% of videos encoded by the proposed technique give almost equal or better subjective quality compared with the conventional fixed-frame-rate approach.