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TrackIR is an optical motion tracking game controller for Microsoft Windows, created by NaturalPoint Inc. that tracks head motions with up to six degrees of freedom (6DOF) in later models, allowing handsfree view control for improved game immersiveness and situational awareness. Head position and orientation are measured by a purpose-built video camera, mounted on top of the user's monitor, which observes invisible infrared (IR) light (hence the name) reflected or emitted by markers on a rigid model worn by the user. TrackIR software is used to access and control the camera, as well as adjust tracking and manage game profiles. The ratio of actual head movement to virtual head movement can be changed, allowing the virtual head to turn 180 degrees whilst the user still looks at the monitor. TrackIR has promoted and established head tracking in PC games, achieving support from many developers, particularly those involved in the simulation genre. In the process its interface has become the de facto standard for head-tracking game view control, although other commercial and non-commercial solutions exist. NaturalPoint have maintained the possibility of TrackIR eventually entering the video game console market.〔(【引用サイトリンク】 url=http://www.simhq.com/_technology/technology_004a.html )〕〔(【引用サイトリンク】 author = Blythe )〕 ==Technical details== TrackIR cameras have a monochrome sensor with an on-board programmable logic device which pre-processes grayscale video into a thresholded binary video. This is sent to the computer via USB and further processed by TrackIR software to locate markers and from this estimate head position and orientation, all using only a small amount of bandwidth and CPU. Tracking is made possible by the user wearing one of three different types of models. A single dot can be used for 2DOF, typically placed on the tip of a baseball cap, while 6DOF requires a special rigid model with three markers. Of the 6DOF models, the ''TrackClip'' model is intended to be cap mounted, with reflective material used for markers, and the ''TrackClip PRO'' model is headset mounted, with infrared LEDs used for markers. The front of the camera has a plastic infrared filter which appears black, this reduces the brightness of non-IR light sources. This allows infrared light reflected or emitted by trackable objects on the user to be better isolated and tracked. The TrackClip requires infrared LEDs to be activated in the camera, which are directed towards the user, to illuminate the model's reflective markers. The power output of these LEDs is about 500 times lower than the ANSI safe limit for extended exposure (more than 16 minutes)〔(【引用サイトリンク】 author = NaturalPoint – Vincent )〕 so is no more harmful than ambient light. 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「TrackIR」の詳細全文を読む スポンサード リンク
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