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  • (4) To compute the velocity function (u, v), the Horn-Schunck method [13] minimises the error ζ(u, v) given by ζ(u,v)=∫D(Exu+Eyv+Et)2dxdy+η2∫D(ux2+uy2+vx2+vy2)dxdy,(5) where η is a weighting factor that scales global smoothness.
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