[Insight-users] LandmarkWarping2.cxx artifact

[Sara Rolfe]

Thanks!  That solved my issue.

Sara


On May 2, 2010, at 3:20 PM, Luis Ibanez wrote:

> Hi Sara,
>
> The planes that you are seeing in the borders of the image
> are caused when the deformation is such that points of the
> image are mapped outside of the domain of the input image.
>
> In such cases, the itkWarpImageFilter by default sets those
> pixels to a zero value.  If the background value of your image
> is not zero, then an artificial boundary is created in those
> regions.
>
>
> You can fix this, by calling the method:
>
>         wrapper->SetEdgePaddingValue( VV );
>
> where VV should be a value equal to the background
> of your image.
>
> For example,
> in a CT scan you probably want to set VV
> to the value:    -1024.
>
>
>   Regards,
>
>
>        Luis
>
>
> --------------------------------------------------------------------------------------
> On Thu, Apr 29, 2010 at 6:15 PM, Sara Rolfe  
> <smrolfe at u.washington.edu> wrote:
>> Hello,
>>
>> I am testing DeformableRegistration7.cxx and would like to generate  
>> my own
>> example data.  I have a 3D image and would like to warp it using  
>> landmark
>> warping.  I am using the example LandmarkWarping2.cxx to do this.  My
>> problem is that when I warp the image I get a result that has a  
>> plane on one
>> or more edges of the image.  When I use a landmark file that has no
>> difference between the original and transformed points, I get no  
>> error in
>> the output.   I am using the same image for the moving and fixed  
>> image since
>> I assume they should stay in the same space.
>>
>> Please let me know if you have any idea what might cause artifacts  
>> in the
>> output of LandmarkWarping2.cxx.
>>
>> Thanks,
>>
>> Sara
>>
>>
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