within a video, when groups of person are formed....those groups are detected on the basis of spatio-temporal distance.....
The answer can be found using Google search "spatio temporal distance". For instance, a paper at https://paginas.fe.up.pt/~prodei/dsie12/papers/paper_13.pdf should answer to your question.
Best regards,
Jüri Vedru
Point (x,y) at frame 1 it is approximately the same at the frame 2
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