Modified Optic Flow Algorithm
nThe algorithm compares points having similar intensities on the reference face and the new face.
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nE=Sh,f||(vhdI(h,f)/dh+vfdI(h,f)/df +DI||2
n E is minimized for every point (h,f).
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nWe need to determine v(h,f)=(Dh(h,f),Df(h,f))T such that each point I1(h,f) is mapped to I2(h+Dh,f+Df)
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