Get perspective quadrangle vertices


FwStatus   fwiGetPerspectiveQuad ( FwiRect srcRoidouble quad[4][2]const double coeffs[3][3] );


coeffs[3][3]   Coefficients for Warp Affine Perspective transform.
quad[4][2]   Quadrangle vertex coordinates.
srcRoi   Source image ROI.


This function is used with the GetPerspectiveBound function. It computes the vertex coordinates of the quadrangular destination ROI for the WarpPerspectiveQuad functions.

Quad[0] contains the top right x and y coordinates

Quad[1] contains the top left x and y coordinates

Quad[2] contains the bottom right x and y coordinates

Quad[3] contains the bottom left x and y coordinates