Re: Anti-Aliasing / How to reconstruct a zoomed image

Hi Erasmo,

There are several open source image manipulation libraries. ImageMagick
(www.imagemagick.org) and its clone GraphicsMagick
(www.graphicsmagick.org) are widely known. Both are highly portable and
supported in several programing languages.

Check the available resizing algorithms here:
http://www.imagemagick.org/api/magick-image.php#MagickCommentImage

Note that most graphics libraries (including the above mentioned) are
designed for computer graphics and publishing applications, not for
medical imaging. So, they are aiming at 'visual enhancment' of an image
rather than 'correctness'. Some algorithms may add incorrect details,
like halos, which may lead to incorrect diagnostic. You should have
experienced radiologist extensively test the chosen algorithm with
different studies before it is used in actual diagnostic.

Another note is that you also should use good algorithm for
downsampling too (zoom out) as it greatly enhances the small image (in
contrast to removing rows and columns).

These libraries may also have several important functions for your
application, like importing and exporting other image formats, changing
'Levels' ('Window' in medical terminology).

Hope this helps,

Mohammad Alhashash

.

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