How do I handle videos?I've found that if a person lies on their legs and can't detect it, how can it be improved?

[Pocfeis]

Yes, I used to want to use this processing video, tried many times but failed, someone knows how to modify can detect video? In addition, I found that when I lie down or flat body, especially when the legs do not bend the detection effect is not very good, I adjusted the threshold effect is not obvious, someone knows what to do?

[jackjackmei]

Have you solved the above problems，share please