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why is not "H=homomgraphy.Haffine_from_points(fp,tp)" but "H=homomgraphy.Haffine_from_points(tp,fp)" ?

In the example "def image_in_image" of chapter 3, why is not "H=homomgraphy.Haffine_from_points(fp,tp)" but "H=homomgraphy.Haffine_from_points(tp,fp)" ?
If fp is four point in im1 and tp is an area of im2, fp=H*tp. This mean that H is the transform from im2 to im1, but our target is H is the transform from im1 to im2, so I give such question.
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