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Peripheral Head-Mounted Display (PHMD) : ウィキペディア英語版 | Peripheral Head-Mounted Display (PHMD)
A Peripheral Head-Mounted Display (PHMD) describes a visual display (monocular or binocular) mounted to the user’s head that is in the peripheral of the user’s Field-of-View (FOV) / Peripheral Vision. Whereby the actual position of the mounting (as the display technology) is considered to be irrelevant as long as it does not cover the entire FOV. While a PHMD provide an additional, always-available visual output channel, it does not limit the user performing real world tasks. The term PHMD includes devices such as Google Glass, which are often missclassified as a Head-up display (HUD).〔Starner, T. (2013). Project glass: An extension of the self. In Pervasive Computing, IEEE, 12(2), 14-16.〕 if following the original definition by NASA.〔Prinzel, L., & Risser, M. Head-up displays and attention capture. In ''NASA TechnicalMemorandum'', 213000. 2004.〕 While NASA defined this term over centuries of space flight research,〔 it actually describes a display that addresses the eyes-free problem, by absolving the user from the need to angle down their head. Furthermore, it provides augmented information in the user’s forward Field-of-View (FOV), which is commonly projected on a windshield. In contrast, the Head-Down Display (HDD) is located at the instrument control panel.〔 Also, a HUD is mainly used to augment additional information into reality, which is technically not feasible yet for products such as Google Glass (lens focus on the display causes a blurred environment – see figure below). This taxonomy for head-mounted displays is based on the property of its functionality and the ability of the human eye to perceive peripheral information, instead of being technology-dependent. In this article Human Factors for visual perception are being summarized, which are important to be taken into consideration when designing visual interfaces for PHMDs. ==Characteristics==
The most important uniqueness is that the user’s FOV is not being fully covered, allowing the user to perform real world tasks without limitations, while not having the pretension to raise or create immersion, such as HMDs often aim for. For current display technologies, while projecting image onto the eye, the screen needs to be focused by the pupil to enable a clear reading of the screen, thus the environment becomes blurred and out-of-focus. So a PHMD such as Google Glass is capable of displaying detailed information, when the pupil is focusing the display itself, as it also allows for peripheral information when the eye focuses on the real world. Still, simple information such as notifications are perceivable when focusing on the real world instead of the display.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Peripheral Head-Mounted Display (PHMD)」の詳細全文を読む
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