Clarification on Transform classes description

[Eduardo Henrique Arnold]

Hi. I have been trying to use the *ProjectiveTransform* class to fix 
perspective deformation and it took me a while to realize the *estimate* method 
uses (x, y) coordinates and that was the source of my unexpected results. 
Even though the vector is described in the class description, I think it 
should either explicitly define the form of coordinates or use the default 
convention for images (y, x).

I appreciate your attention,
   Eduardo.
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