For building up the equation system I need least 8 correspondences (so 8 interest points in each Image or perspective).
The equation system A is solved with the SVD, but before I need to scale and shift all interest points to [-1 .. 1] by applying the transformation matrix.
After solving the equation system using SVD with:
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[U, D, V'] = SVD(A,0);
Until now, there is no understanding problem (I suppose).
But now for solving this problem, F_tilde should be of rank(F_tilde) = 2. (Slides 74-79)
Why we need rank of 2 ?
I do not understand this step.