[Insight-users] [ITK Community] PadImageFilter and image origin?

[Cory Quammen]

Loic,

Yes, I think you are right. I forgot that the origin specifies the
position of the zeroth index, not the index of the image's largest
region.

Best,
Cory

On Mon, Mar 3, 2014 at 8:35 AM, Loic Le Folgoc <loic.itk at gmail.com> wrote:
> Hi,
>
> If the origin (physical coordinates of index (0,0)) has been kept the same,
> then it's likely the starting index of the padded image
> (GetLargestPossibleRegion().GetIndex()) that is modified accordingly. I'm
> pretty sure this filter works as intended but I don't have the code under my
> eyes to double-check.
>
> However, I do think there are a couple of filters with possibly suspicious
> handling of the output starting index/origin. The
> InverseDisplacementFieldImageFilter comes to mind: I could be wrong, but it
> doesn't seem to handle the starting index of the output image at all, which
> then defaults to 0. Of course the user is free to change the spacing, origin
> and size of the output domain, but I guess the expected default behaviour
> would be (that of most ImageToImage filters) for the output to replicate the
> region/spacing/origin of the input to avoid possible loss of consistency.
>
> Loïc
>
> Le 03/03/2014 12:03, Cory Quammen a écrit :
>
> Arnaud,
>
> That sounds like a bug. I would think the padding should affect the
> origin so as to keep the original image content in the padded image to
> be at the same physical location as the input.
>
> Cory
>
> On Mon, Mar 3, 2014 at 5:22 AM, Arnaud Gelas <arnaudgelas at gmail.com> wrote:
>
> Hi all,
>
> Is it normal that the output image of a PadImageFilter (and derivatives) has
> the same origin as the input?
>
> I just wonder if it is a bug, or not...
>
> Thanks,
> Arnaud
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