[Insight-users] Re sample Filter without deleting existing pixels

[Andreas Schuh]

Hi Sabine,

actually I'm not sure if you know what the resampling filter is doing.  
Definitely no pixels get overwritten when appling this filter. This  
wouldn't be a resampling anyway. The default pixel value is just set  
for the outside where no image information is defined by the input  
image. In fact you want to apply a (rigid?) transformation to the  
input image. Afterwards you may want to resample the transformed  
image. But don't know if you really need to.

In case of a rigid transformation you just need to transform the  
origin and direction of the image and set them manually. In case a non- 
rigid deformation consider using the WarpImageFilter. You could also  
apply this filter with a rigid transformation while making use of the  
TransformToDeformationFieldSource, I guess. However, just transforming  
the origin and direction should be preferred.

--
regards
Andreas

Am 26.02.2009 um 18:46 schrieb slorentz <professor_rumsdiegeige at yahoo.com 
 >:

>
> Hello,
>
> thanks for the quick answer.
>
> However: the reason I would like to use the ResampleFilter is that the
> geometric transform is already applied. The background is: I have two
> images, compute the translational transform ("registration"), and  
> then I
> need to stitch these images together. So when I use the  
> PasteImageFilter
> then I need to apply the transform myself... All I would need would  
> be the
> ResampleFilter without overwriting existing pixels...
>
> Any other hints, especially on image stitching?
>
> Regards,
> Sabine Lorentz
>
>
>
> Luis Ibanez wrote:
>>
>> Hi Sabine,
>>
>> It looks like what you really need is the itkPasteImageFilter
>> http://public.kitware.com/Insight/Doxygen/html/classitk_1_1PasteImageFilter.html
>>
>>     Regards,
>>
>>          Luis
>>
>>
>> -------------------------------------------------
>> On Wed, Feb 25, 2009 at 11:28 AM, slorentz
>> <professor_rumsdiegeige at yahoo.com
>>> wrote:
>>
>>>
>>> Hello,
>>>
>>> when using the resample filter, it is possible to specify a  
>>> default pixel
>>> value ("SetDefaultPixelValue").
>>>
>>> How can I make this filter not overwrite existing pixels? That is,  
>>> leave
>>> all
>>> pixels as they are instead of replacing them by this default value?
>>>
>>> Thanks for your help!
>>> Regards
>>> Sabine Lorentz
>>> --
>>>
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