[Insight-users] What is the *correct* way to downsample an image with ITK?

[Dan Mueller]

Hi Joel,

You may be interested in the following paper:

http://www.imagescience.org/meijering/publications/download/miccai1999.pdf
@inproceedings{Meijering1999a,
   Author = {E. Meijering and W. Niessen and J. Pluim and M. Viergever},
   Title = {Quantitative Comparison of Sinc-Approximating Kernels for
Medical Image Interpolation},
   Booktitle = {Proceedings of Medical Image Computing and
Computer-Assisted Intervention (MICCAI)},
   Page = {210--217},
   Publisher = {Springer},
   Volume = {1679},
   Year = {1999}
}

Some of these interpolation kernels are implemented in ITK, see:
    http://www.itk.org/cgi-bin/viewcvs.cgi/Code/Common/itkWindowedSincInterpolateImageFunction.h?root=Insight&view=markup

Of course, doing things the "correct" way costs performance...

HTH

Cheers, Dan

On 11 June 2010 11:42, Joel Schaerer <joelthelion at laposte.net> wrote:
>
> I've been looking at correct image resampling for vv
> (http://www.creatis.insa-lyon.fr/rio/vv).
>
> In the case of subsampling, the ITK software guide (p244) instructs to use a
> Gaussian filter as a low-pass before doing the actual subsampling. However,
> it seems to me that a Gaussian is far from ideal as a low-pass filter, since
> it doesn't have a flat frequency response in the passband. The wikipedia
> page on low pass filters does not mention the use of the Gaussian filter as
> a low-pass filter.
>
> My question is: can this issue be safely ignored for medical images? Is a
> Gaussian filter really good enough to perform subsampling of medical images?
> --
> View this message in context: http://old.nabble.com/What-is-the-*correct*-way-to-downsample-an-image-with-ITK--tp28853063p28853063.html
> Sent from the ITK - Users mailing list archive at Nabble.com.
>
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