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

[Joel Schaerer]

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?
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