Another alternative to the mouse as a pointing device is to use a gaze-tracking camera, which works out where you are looking and moves an on-screen pointer accordingly.

另外一种鼠标替换物是视线跟踪系统，它能判断出你的视线移动的位置并相应地调整屏幕光标移动的位置。

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The digital photograph was made with a camera mounted on a telescope tracking the stars through dark skies above a camp ground in Virginia, USA.

这张数码照片是用架在能跟踪天体的望远镜上的照相机拍的，于美国弗吉尼亚一露营基地。

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But the camera is actually tracking where my fingers are moving.

录像机还在追踪我的手指的移动。

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The depth-sensing, motion tracking camera, designed for the XBox games console, was a hit with gamers, but also captured the imagination of hardware developers around the world.

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Another alternative to the mouse as a pointing device is to use a gaze-tracking camera, which works out where you are looking and moves an on-screen pointer accordingly.

ECONOMIST: Computer interfaces

Certified as the first Ultrabook optimized for MS Lync, the HD face tracking camera and dual array microphones ensure high quality video and voice track capability without the need to use USB peripherals.

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