[vtkusers] vtkImageReslice accuracy

[David Gobbi]

On Sun, 2 Jul 2000, Edi wrote:

>    Are there any studies on how accurate the vtkImageReslice is ?
> 
>   Thank you in advance.
> 
> Edi

The vtkImageReslice filter uses straightforward 
coordinate transformation plus lookup with interpolation.
The coordinate transformation and interpolation are both
done with floats, i.e. the precision is around 24 bits.
This means that you will lose precision if your data is
32-bit ints or doubles.

Any inaccuracies in the results provided by this filter,
beyond the 24-bit precision limit, would be the result of misuse
and/or bugs.  The only 'known' bug in the VTK 3.1 release
had to do with using vtkImageReslice with a vtkThinPlateSplineTransform.
Other than that, vtkImageReslice has been stable & widely used for well
over a year now.

Finally, to answer your question, I'm not aware of any studies
which provide a quantitative measure of how accurate vtkImageReslice
is.

 - David

--
  David Gobbi, MSc                    dgobbi at irus.rri.on.ca
  Advanced Imaging Research Group
  Robarts Research Institute, University of Western Ontario