[Insight-users] A basic Image question

Fri Jun 25 15:47:36 EDT 2010

Hi Dirk,

What resampling filter are you using ?

--

The convention of coordinate systems in ITK
is that the Origin is located in the lower left
pixel of the image (e.g. the mathematical
standard, not the computer graphics standard).

For the image that you describe,

yes, the physical extent is

x = [-1,+1]
y = [-0.5,+0.5]

If you are using the itkResampleImageFilter, it is
your responsibility to pick the new origin,
(since any new origin will be a possible choice).

    Regards,

        Luis

--------------------------------------------------------
On Fri, Jun 25, 2010 at 2:16 AM, Dirk Boye <body at nabla.org> wrote:

> Dear list,
>
> I am using some tool for resampling images and found something disturbing.
>
> Let's say I have a 2d image with only 1 pixel. The origin is in 0,0 and
> the spacing is dx=2mm, dy=1mm.
> The origin is the center of the lower left pixel/voxel, right?
> That means my 'image' has the physical boundaries (pixel coverage)
>  in x [-1,+1] and in y [-0.5,+0.5]
>
> Now i want to resample my 1 pixel image into 2x2 pixels.
> After resampling the origin should be moved so the physical boundaries
> are preserved, is that correct? (Because the origin is always the center
> of the lower left voxel)
>
> The tool I'm using does not do the movement of the origin so i programmed
> my own.
> Or am i mistaken? :)
>
> Cheers,
> Dirk
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