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In the below pic, I can not understand what U vector is? It says flow field but I can not imagie what really is the flow field?

enter image description here

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  • $\begingroup$ I think it is derivative of I, dI / dt (frame to frame). And you aim to solve for it $\endgroup$ – MimSaad Jul 3 '18 at 19:51
  • $\begingroup$ u is the displacement field which deforms your initial frame. each intensity value at pixel x moved to x+u in the next frame. $\endgroup$ – Mohammad M Jul 4 '18 at 13:16

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