After creating the map and putting a marker on it, you start tracking the user.

创建地图并放置标记后，开始追踪用户。

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For visual-based tracking system, the paper discusses and carries out the selection and identification of the Marker, camera calibration and the virtual-reality registration.

在基于标志物的视觉跟踪系统中，本文对真实场景中标志物的选取和识别、摄像机标定、以及虚实物体配准等相关问题进行了论述和实现。

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You can also use the ASP to enhance such HP 4194a functions as alternate sweep, sweep timing control, and marker tracking.

你也可以用asp，以提高这类惠普4194 a功能，作为候补扫，扫定时控制，并标记追踪。

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