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The
image flow vector V=[dx, dy]
maps intensity neighborhood N1
of
(x,y) at t1 to an identical neighborhood N2 of (x+ dx,y+
dy) at t2,
which
yields:
Combining we get the image flow equation
Image Flow Equation
Using the continuity of the intensity
function and Taylor series we get:
which gives not a solution but a linear
constraint on the flow.