3Do F VR是VR视频的一种代表性形态,也是目前虚拟现实领域普遍应用的形式。图像质量是一项会影响用户真实沉浸视觉感受的VR视频QoE的重要指标。目前国内外暂未形成VR视频领域图像质量主观评价的标准方法,为此,本文研究提出了一套3Do F V...3Do F VR是VR视频的一种代表性形态,也是目前虚拟现实领域普遍应用的形式。图像质量是一项会影响用户真实沉浸视觉感受的VR视频QoE的重要指标。目前国内外暂未形成VR视频领域图像质量主观评价的标准方法,为此,本文研究提出了一套3Do F VR视频图像质量主观评价方法。文章首先对VR视频主观评价的挑战、国内外进展进行分析调研,随后着重阐述了3Do F VR视频主观评价前期准备研究、主观评价量表设计、主观评价打分方法改进、实验序列制作等环节,最后进行了3DoF VR视频图像质量主观评价实验,并对实验数据进行了分析和总结。展开更多
A 3DOF (three degrees of freedom) helicopter attitude control system with multi-operationpoints is described as a MIMO time-varying uncertain nonlinear system with unknown constant param-eters,bounded disturbance and ...A 3DOF (three degrees of freedom) helicopter attitude control system with multi-operationpoints is described as a MIMO time-varying uncertain nonlinear system with unknown constant param-eters,bounded disturbance and nonlinear uncertainty,and a robust output feedback control methodbased on signal compensation is proposed.A controller designed by this method consists of a nominalcontroller and a robust compensator.The controller is linear time-invariant and can be realized easily.Robust attitude tracking property of closed-loop system is proven and experimental results show thatthe designed control system can guarantee high precision robust attitude control under multi-operationpoints.展开更多
state space algorithms are proposed for the three degree of freedom (3DOF) optimal Wiener Hopf controller for a class of systems with time delay feedback sensors and employed in the design of a terrain following ...state space algorithms are proposed for the three degree of freedom (3DOF) optimal Wiener Hopf controller for a class of systems with time delay feedback sensors and employed in the design of a terrain following control system, with the influence caused by the delay of baric altimeter successfully eliminated.展开更多
文摘3Do F VR是VR视频的一种代表性形态,也是目前虚拟现实领域普遍应用的形式。图像质量是一项会影响用户真实沉浸视觉感受的VR视频QoE的重要指标。目前国内外暂未形成VR视频领域图像质量主观评价的标准方法,为此,本文研究提出了一套3Do F VR视频图像质量主观评价方法。文章首先对VR视频主观评价的挑战、国内外进展进行分析调研,随后着重阐述了3Do F VR视频主观评价前期准备研究、主观评价量表设计、主观评价打分方法改进、实验序列制作等环节,最后进行了3DoF VR视频图像质量主观评价实验,并对实验数据进行了分析和总结。
基金supported by the National Natural Science Foundation of China under Grant Nos. 60674017 and 60736024
文摘A 3DOF (three degrees of freedom) helicopter attitude control system with multi-operationpoints is described as a MIMO time-varying uncertain nonlinear system with unknown constant param-eters,bounded disturbance and nonlinear uncertainty,and a robust output feedback control methodbased on signal compensation is proposed.A controller designed by this method consists of a nominalcontroller and a robust compensator.The controller is linear time-invariant and can be realized easily.Robust attitude tracking property of closed-loop system is proven and experimental results show thatthe designed control system can guarantee high precision robust attitude control under multi-operationpoints.
文摘state space algorithms are proposed for the three degree of freedom (3DOF) optimal Wiener Hopf controller for a class of systems with time delay feedback sensors and employed in the design of a terrain following control system, with the influence caused by the delay of baric altimeter successfully eliminated.