opencv/imgproc.go
func GetPerspectiveTransform(rect, dst []CvPoint2D32f) *Mat {
	mat := CreateMat(3, 3, CV_64F)
	result := C.cvGetPerspectiveTransform(
		(*C.CvPoint2D32f)(&rect[0]),
		(*C.CvPoint2D32f)(&dst[0]),
		(*C.struct_CvMat)(mat))
	return (*Mat)(result)
}
func GetPerspectiveTransform(rect, dst []CvPoint2D32f) *Mat {
	mat := CreateMat(3, 3, CV_64F)
	result := C.cvGetPerspectiveTransform(
		(*C.CvPoint2D32f)(&rect[0]),
		(*C.CvPoint2D32f)(&dst[0]),
		(*C.struct_CvMat)(mat))
	return (*Mat)(result)
}
// GetPerspectiveTransform calculates a perspective transform from four pairs of the corresponding points.
//
// Parameters:
// 	src – Coordinates of quadrangle vertices in the source image.
// 	dst – Coordinates of the corresponding quadrangle vertices in the destination image.
// 	Returns the computed matrix