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

[Loic Le Folgoc]

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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