Research on virtual reality interface to display sense of material using human perception mechanism

1. 目的传统的用于虚拟空间交互的触觉接口设备存在局限性，例如在被动触摸运动中，这些设备不具备显示虚拟物体柔软度的性能。本研究基于人体对柔软度感知的运动分析结果，开发了一种创新性的柔软度显示装置。本文还实现了一个通过网络共享软感的实验系统。项目与结果实验分析了人体对物体柔软度的感知。研究发现，无论物体的柔软程度如何，峰值接触面积都是恒定的，这种趋势可以用恒虚位移假设来解释。基于接触面积不变的趋势，设计了一种柔性显示装置，动态控制手指与设备的接触面积。四个虚拟物体之间的区分率为94%，四个虚拟物体与原始物体相比的认知率为75%。验证了接触面积控制软度显示的可行性。在UDP/IP网络上，利用两台配有指尖力显示装置的计算机，构建了一个试验性的软性共享系统。在不受手指位置限制的情况下，通过力显示器显示物体传递的反作用力，通过CRT显示器显示指尖位移。结果表明，50、100、200、400 N/m的软度是可以区分的。基于实验发现的人体捏动对柔软度感知的倾向，提出了一种基于接触面积控制的柔软度显示方法，并验证了该方法的可行性。并论证了利用力显示器在网络上实现柔软度远程共享的可行性。这些结果在远程康复等远程合作领域的应用还有待进一步研究。少

1. ObjectiveConventional haptic interface devices for virtual space interaction have limitations, for instance, those devices do not have performance to display the softness of virtual objects in passive touch motion. In this study, an innovative softness display device was developed based on the result of human motion analysis for softness perception. An experimental system to share the sense of softness over network has also implemented.2. Projects and resultsThe human pinch motion to perceive the softness of objects was analyzed experimentally. It was found that the peak contact area is constant in despite of the object softness, and that tendency can be explained by the constant imaginary displacement hypothesis.Based on the constant contact area tendency, a softness display device was developed, which controls the contact area between the finger and the device dynamically. The distinguish rate between four virtual objects were ninety-four percent and the cognitive rate of the four … More virtual objects compare to the original object was seventy-five percent. The feasibility of softness display by contact area control was demonstrated.An experimental softness-sharing system was constructed using two computers with fingertip force-display devices over UDP/IP network. The transmitted reaction force from the object was displayed by the force-display and the fingertip displacement was displayed by the CRT monitor without the restriction of fingers positions. It was demonstrated that the distinguish among 50, 100, 200, 400 N/m softness is possible.3. Concluding remarks and future workThe feasibility of softness display by contact area control, which was developed based on the experimentally found tendency of human pinch motion for softness perception, was demonstrated. The feasibility of remote sharing of softness sense using force-displays over network was also demonstrated. The further study for applying these results on remote cooperation such as telerehabilitation is required. Less