如果探测器函数返回TRUE，该帧被传递给流，如果返回FALSE，该帧将被丢弃。
If the probe function returns TRUE, the frame is passed down the stream, but if it returns FALSE, the frame is dropped.
针对令牌传递与数据帧通信提出确有实效的时间参量软件控制方法。
In accordance with the token passing transmission and data frame communication, a effective software control method in time domain is proposed.
特别采用了中断挂接、事件同步、消息传递、双帧存交替以及优先级设定等技术确保图像采集的实时性。
Specially, such techniques as interrupt hook, event synchronization, message passing, double frame memory alternation and priority setup are used to insure the real-time performance.
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