检索结果-南通市图书馆

Measuring quality of experience for 360-degree videos in virtual reality

Science China(Information Sciences) 2020年第10期63卷 108-122页

作者： Muhammad Shahid ANWAR Jing WANG Asad ULLAH Wahab KHAN Sadique AHMAD Zesong FEI School of Information and Electronics Beijing Institute of Technology Faculty of Engineering Sciences and Technology Iqra University

In recent years, we witness dramatic growing attention in immersive media technologies like 360-degree videos and virtual reality(VR). However, measuring the quality-of-experience(QoE) for 360-degree VR videos is not a trivial task. Streaming such videos to head mounted displays(HMDs) is extremely bandwidth-demanding when compared to traditional 2D videos. In HTTP adaptive streaming, QoE tends to deteriorate significantly during fluctuating network conditions, which results in various bitrate changes and causes multiple stalling events during playback. Thus, understanding how the human visual system perceives 360-degree video with the effect of stalling and different bitrate levels becomes inevitable. In this paper, we investigate the impact of stalling on users QoE under different bitrate levels and the interaction between stalling event and bitrate level for 360-degree videos in VR. To aim this, we first build a 360-degree videos database by encoding videos in three different bitrate levels(1, 5, and 15 Mbps) with 4 K resolutions(3840×1920 pixels). We then simulate various stalling events in the videos and conduct a subjective experiment in a virtual reality environment to investigate the human responses. Finally, we use a Bayesian method to estimate and predict the QoE while measuring the quality drop owing to various stalling events and bitrate changes. Proposed solution and prediction results show a strong dependency between playback stalling and bitrate of 360-degree video in VR. stalling always impacts the QoE of 360-degree videos, but the strength of this negative impact depends on the video bitrate level. The adverse effect of stalling events is more profound when bitrate level approaches to the high and low end, which is in close agreement with subjective opinion.

关键词： quality of experience stalling virtual reality 360-degree video

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

The Study on Simulation of Resistance in Stall Motor

引用

Journal of Electronic & Information Systems 2020年第1期2卷 18-20页

作者： Run Xu Zhiqiang Chen Former Jhonsonelectric(HK)Co.Ltd Sale and Technology Div.Shenzhen 518125China Jhonsonelectric(HK)Co.Ltd Sale and Technology Div.Shenzhen 518125China

The stall phenomenon which happens in loaded motor is unqualification in *** it may measure the maximum property of motor in *** the phenomenon is analyzed to find a simulation of electrical state to predict the maximum currency and torque which is a necessary method to be proceeded up to now before *** find that the simulation fits well to the *** conditions of t=6s,U=12V result in the biggest stall force according to rotation to change time and *** it is t=8s,U=10V;t=10s,U=8V and t=12s,U=6V in *** for torque it is t=6s,U=12V;t=8s,U=10V;t=6s,U=12V and t=12s,U=6V in truns.

关键词： Simulation stalling Rotation Resistance Motor

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：