Calculate optical flow using Horn & Schunck. USAGE [Vx,Vy] = optFlowHorn( I1, I2, [sigma], [show] ) INPUTS I1, I2 - input images to calculate flow between sigma - [1] amount to smooth by (may be 0) show - [0] figure to use for display (no display if == 0) OUTPUTS Vx, Vy - x,y components of flow [Vx>0->right, Vy>0->down] EXAMPLE See also OPTFLOWCORR, OPTFLOWLK