How to detect start and end of a gesture in kinect?

There is no way you can detect the beginning of a unknown gesture within a learning engine. There must be some discrete action that tells the system that a gesture is about to be started for it to learn. Without this discrete action the system can not know what motion is the beginning of the gesture, v.s.

A motion between, v.s. A motion moving towards the beginning, v.s. An arbitrary motion the engine should care nothing about.

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