[Insight-users] Warp Image Filter

[Luis Ibanez]

Hi Micah,

The WarpImageFilter use an iterative algorithm,
so, probably "convergence" is not the real problem
here.

ITK should be managing correctly any values of
direction cosines that are orthogonal.

Tell us more about how you generated the deformation
field that you are passing to the WarpImageFilter.

It particular, we need to know if it has the same

* Origin
* Spacing
* Orientation

as the parameters of the output image.

Please post to the list as well, the

* Origin
* Spacing
* Orientation

of the input image that you are trying to
wrap.


    Thanks


         Luis

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On Mon, Jun 14, 2010 at 12:50 PM, Micah Chambers <micahc at vt.edu> wrote:

> I have a program based on the warpImageFilter that fails to converge when
> the direction consines for an oriented image (2D) are set to
> -1 0
> 0 -1
> I, perhaps incorrectly, thought that the direction matrix merely had to
> conform to the requirements that:
> the direction vectors are orthogonal
> the direction vectors are normal (unit length)
> Thus this should fit the bill. However, for some reason an algorithm that
> works when ALL images have directions
> 1 0
> 0 1
> fails to work, and more specifically the warper fails, when the directions
> are ALL set to
> -1 0
> 0 -1
>
> Is there a known bug in the warper, am I missing something, or both?
> Thanks,
> -Micah
>
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