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

[Joel Schaerer]

Hi Dženan,

Thanks for your answer. I have tried various interpolation functions
(NN,Linear, cubic BSpline and Windowed Sinc) with a test checkerboard
pattern, and I am still experiencing major aliasing problems.

What am I doing wrong?

PS:

The pattern is here:

http://www.creatis.insa-lyon.fr/~schaerer/checkerboard.png

You can read my code at the following location:

http://cvs.creatis.insa-lyon.fr/viewvc/clitk3/filters/clitkImageResampleGenericFilter.cxx?revision=1.10&view=markup


Dženan Zukić wrote:
> 
> 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
> 
> 

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