NHK has been doing R&D on haptic information transmission systems to implement such services 1). The transmission of haptic information is also expected to realize a universal information service that can be simultaneously enjoyed by persons with vision or hearing impairment. Haptic information may make it possible, for example, to convey the hardness or softness and texture of an object, which is difficult when only video or audio information is available. The presentation of haptic *1 information in addition to visual and auditory information can be expected to further enhance user experience in next-generation media such as three-dimensional (3D) TV, augmented reality (AR), and virtual reality (VR). In this report, we describe the device development and considerations on the device-design guidelines based on the results of a user evaluation. The experimental results suggested that the method of expressing partial differences in hardness is effective as a guideline for designing hardness-presenting devices. In addition, it was found that subjects can perceive relative differences in the hardness between the virtual spring presented by the developed device and the real spring within a certain range of spring constant. By using the developed device, it was confirmed that subjects can distinguish the difference between the lateral shapes of virtual cylinders, hexagonal columns, and quadrangular prisms. As part of it, we developed a haptic device that presents the three-dimensional shape and hardness of virtual objects. This research aims to realize a service to convey haptic information that is hard to represent by video and sound, such as the hardness or texture of an object. Development of a Haptic Device that Presents Information on Three-dimensional Shape and Hardness of a Virtual Object in Space
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