Этот вопрос о функциях OpenCVfindHomography, getPerspectiveTransform & Амп;getAffineTransform

What is the difference between findHomography and getPerspectiveTransform?. My understanding from the documentation is that getPerspectiveTransform computes the transform using 4 correspondences (which is the minimum required to compute a homography/perspective transform) where as findHomography computes the transform even if you provide more than 4 correspondencies (presumably using something like a least squares method?). Is this correct? (In which case the only reason OpenCV still continues to support getPerspectiveTransform should be legacy? )

My next concern is that I want to know if there is an equivalent to findHomography for computing an Affine transformation? i.e. a function which uses a least squares or an equivalent robust method to compute and affine transformation. According to the documentation getAffineTransform takes in only 3 correspondences (which is the min required to compute an affine transform).

Лучший,