[ITK-users] Image Rotation while preserving image

[Emma Ryan]

HI Matt,

 Thank you for your reply. Attached is a snapshot of what is happening. The square needs to rotate and become a diamond. But after rotation, I get a chopped image. Ideally, I would just expect a larger sized matrix holding the larger image. So I'm not sure I understand how the 'content' could be missing.

I couldn't experiment with SetExtrapolator as it is probably not available in the version of itk that I am using . Version 3.X.

Are you suggesting that using Extrapolation, I would be able to address this specific problem ?

regards,
Emma








On Wednesday, September 24, 2014 7:44 AM, Matt McCormick <matt.mccormick at kitware.com> wrote:
 


Hi Emma,

If there is no content to resample from after the transformation, then
a default pixel value is used.  To use extrapolation instead, call
SetExtrapolator() [1] on the ResampleImageFilter.

HTH,
Matt

[1] http://www.itk.org/Insight/Doxygen/html/classitk_1_1ResampleImageFilter.html#a89d912b5608fbe73a9a2ca0ebcfebb69


On Wed, Sep 24, 2014 at 7:27 AM, Emma Ryan via Insight-users
<insight-users at itk.org> wrote:
> Hi,
>
>   I would like to rotate an input mage by a few degrees. I was able to
> easily do this using rigid transforms available in itk. But the output image
> is cropped. The extent of cropping is directly related to the angle of
> rotation. How can one disallow this kind of cropping ?
>
> Thank you for your help.
> regards,
> Emma
>
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