Hi Micah,<br><br>The WarpImageFilter use an iterative algorithm,<br>so, probably "convergence" is not the real problem<br>here.<br><br>ITK should be managing correctly any values of <br>direction cosines that are orthogonal.<br>
<br>Tell us more about how you generated the deformation<br>field that you are passing to the WarpImageFilter.<br><br>It particular, we need to know if it has the same<br><br>* Origin<br>* Spacing<br>* Orientation<br><br>
as the parameters of the output image.<br><br>Please post to the list as well, the <br><br>* Origin<br>* Spacing<br>* Orientation<br><br>of the input image that you are trying to<br>wrap.<br><br><br> Thanks<br><br><br>
Luis<br><br>---------------------------------------------------------------------------<br><div class="gmail_quote">On Mon, Jun 14, 2010 at 12:50 PM, Micah Chambers <span dir="ltr"><<a href="mailto:micahc@vt.edu">micahc@vt.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><span style="font-family: arial,sans-serif; font-size: 13px; border-collapse: collapse;">I have a program based on the warpImageFilter that fails to converge when the direction consines for an oriented image (2D) are set to <div>
-1 0 </div><div>0 -1</div><div>I, perhaps incorrectly, thought that the direction matrix merely had to conform to the requirements that:</div><div>the direction vectors are orthogonal</div><div>the direction vectors are normal (unit length)</div>
<div>Thus this should fit the bill. However, for some reason an algorithm that works when ALL images have directions</div><div>1 0</div><div>0 1</div><div>fails to work, and more specifically the warper fails, when the directions are ALL set to </div>
<div>-1 0 </div><div>0 -1</div><div><br></div><div>Is there a known bug in the warper, am I missing something, or both? Thanks,</div><div>-Micah</div></span>
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