[vtkusers] itk transform vs vtk transform

[Quy Pham Sy]

Hi,
I going to implement a program that enable user to match two image manually.
All the user made transform is implemented in VTK, and then use ITK's metric
to evaluate the matching. because there are some difference in ITK's and
VTK's coordinate system convention so I need to confirm some information
about ITK and VTK images coordinate system:

1. ITK image's origin is  associated with first pixel which is *the pixel at
top-right corner* of image, while VTK image's origin is at *the pixel at
bottom-right* of image, is that correct?

2. Using metric class in ITK, at the beginning, the origins of both fixed
image and moving image are at the same position, is it right? and the
transform parameter pass to function GetValue of metric class is actually
applied to FixedImage instead of moving image?

3. If i transform an image in VTK, is that the same if i use this transform
matrix in ITK? (which mean that if i use the transformation in VTK to
evaluate the matching using ITK's metric can i get the correct result?)


Plz help, really appreciate!

Quyps
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