"Francisco Seixas" wrote in message <email@example.com>... > I mean I have the coordinates of the *centers* of the cells in each corner, and I'd like to find the coordinates of the *centers* of all other cells.
If you have the image processing toolbox, this is easy to do with the functions maketform and tformfwd/tforminv. Otherwise it's only slightly harder... it's just a simple linear transformation. See e.g. http://en.wikipedia.org/wiki/Transformation_matrix