[Insight-users] how to construct affine registration matrix from registration

[pinpress]

Thank both for the help.

I have found out that the affine transformation matrix was indeed
constructed by reshaping the 12 values into a 3-by-4 matrix in column major,
i.e., 

1 4 7 10
2 5 8 11
3 6 9 12

and the last row is [0 0 0 1]. However, it specifies the transformation from
the fixed to the moving image!! This is important, not the other way around.
In addition to make the transformation work correctly, one must also notice
the "center" returned from the program (because we used Centered
Transformation). We must de-mean the center first before applying the affine
transformation and then add the mean (i.e, center component) after the
transformation. 
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