Nodding frequency is obtained by tracking head movements.

点头频率特征是通过跟踪头部运动获得的。

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And with head tracking available, placement options are increased: the UI can be placed to the user's side, or above the normal line of sight, for instance.

由于具有头部跟踪可用，需要增加放置选项：比如，UI可以放置到用户的一侧，或在正常视线之上。

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The cutting head equips with automatic tracking system, focusing automatically, responding quickly and accurately.

全自动激光切割头高度跟踪系统，自动对焦、反应灵敏、准确。

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The eye tracking system supports leading head and motion tracking technologies such as A.R.

ENGADGET: SMI Eye-Tracking 3D Glasses use rim-based cameras to adjust perspective

The modification still needs refining, but it already incorporates head tracking and warping.

ENGADGET

In order to get the functionality it needed, APX grafted a 5 megapixel camera, mic and a full suite of motion sensors to provide nine-axis head tracking onto a Moverio headset.

ENGADGET