Development of user-centered quality on-demand home theater delivery system

1)关于编码视频的质量评价本研究利用主观质量评价的结果，分析了编码视频的主观帧质量与主观视频质量之间的关系。因此，可以从编码视频的主观帧质量以高精度估计主观视频质量。然而，异常值比率的值根据场景内容和比特率而变化。考虑到视频质量估计值的高估和低估，我们发现异常值比率的变化与运动信息（如摄像机工作和局部运动）的影响有关，如时间退化。2）关于编码视听媒体的质量评估在本研究中，为了建立一个客观的高质量视听媒体的多媒体质量评估模型，我们研究了视频质量和音频质量之间的相互作用（高清晰度视频和多声道音频），根据ITU-T建议J.148。为此，我们分析了交互使用的主观质量评估测试的高清晰度视频和多声道音频。因此，我们得出结论，在制定高质量视听媒体的客观多媒体质量评估模型时，应考虑以下三个程序：（1）根据视频和音频媒体的心理物理量估计Aq和Vq，（2）根据Aq和Vq估计Aq（Vq）和Vq（Aq），（3）根据Aq、Vq估计MMq，Aq（Vq）和Vq（Aq）作为顺应性变量。

1) About the quality evaluation for coded videoIn this research, we have analyzed the relationship between subjective video quality and subjective frame quality of coded video by using the result of subjective quality assessment. Consequently, subjective video quality could estimate with high accuracy from subjective frame quality of coded video. However, the value of outlier ratio were varying according to scene contents and bit rates. In consideration of overestimation and underestimation of the estimated value of video quality, we found out that the variation of outlier ratio was connected with the influence of motion information such as camera work and local motion as the temporal degradation.2) About the quality evaluation for coded audio-visual mediaIn this research, we have investigated an interaction between video quality and audio quality in order to develop an objective multimedia quality assessment model of high-quality audio-visual media (high-definition video and multi-channel audio) according to ITU-T Recommendation J.148. For that purpose, we have analyzed the interaction by using the subjective quality assessment test of high-definition video and multi-channel audio. As a result, we have concluded that the following three procedures should be considered for the development of the objective multimedia quality assessment model of high-quality audio-visual media: (1) estimation of Aq and Vq from psychophysical quantity of video and audio media, (2) estimation of Aq(Vq) and Vq(Aq) from Aq and Vq, (3) estimation of MMq from Aq, Vq, Aq(Vq) and Vq(Aq) as compliant contetns.