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

[Dženan Zukić]

Hi Joel,

Aliasing artifacts appear only with nearest neighbor interpolation. Linear
interpolation should be enough to avoid them (higher order interpolations
also). And by doing a low-pass filtering, you are effectively destroying
part of information in the image. However, depending on what will you be
doing next with that image, low-pass filter might be justified.

Regards,
Dženan

On Fri, Jun 11, 2010 at 13:08, Joel Schaerer <joelthelion at laposte.net>wrote:

>
> Hi Dan,
>
> Thanks for your answer. I've already looked at that paper, but it only
> considers the choice of the interpolation function. My understanding is
> that
> for image downsampling, regardless of the interpolation function you use,
> you have to apply a low-pass filter to the image prior to resampling in
> order to avoid aliasing effects. My question is about this low-pass
> filtering step, not the interpolation function.
>
>
>
> Dan Mueller-2 wrote:
> >
> > 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}
> > }
> >
> >
> >
>
> --
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>
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