要为一个位置定义命名策略，您可以在该位置创建之后将策略直接应用到其上。
To define a named policy for a place, you can apply the policy directly to a place after it's created.
光流法虽可进一步给出运动场中每个像素位置的运动特性，但它所涉及的计算量庞大，难以直接应用于有实时需求的场合。
Optical flow can make up this shortcoming, while the high demand of computing has restricted its application in real-time situation.
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