<div>Actually I am asking this because I have an example where <span class="Apple-style-span" style="border-collapse:collapse;color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px"> itk::WarpImageFilter creates a discontinuous image.</span></div>
<div><span class="Apple-style-span" style="border-collapse:collapse;color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px"><br></span></div><div><span class="Apple-style-span" style="border-collapse:collapse;color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px">According the ThreadedGeneratedData function of the</span><span class="Apple-style-span" style="border-collapse:collapse;color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px"> </span><span class="Apple-style-span" style="border-collapse:collapse;color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px">itk::WarpImageFilter </span><span class="Apple-style-span" style="border-collapse:collapse;color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px"> there is no check about if the calculated output voxel lie inside or outside the deformation field.</span></div>
<div><span class="Apple-style-span" style="border-collapse:collapse;color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px">In the case that lie outside (field value = 0) and the value of the input image is non-zero, then a non-zero value will assign to the output voxel.</span></div>
<div><span class="Apple-style-span" style="border-collapse:collapse;color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px">How can we assign a non zero value to the output voxel if this voxel lie outside the deformation field?</span></div>
<div><span class="Apple-style-span" style="border-collapse:collapse;color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px"><br></span></div><div><span class="Apple-style-span" style="border-collapse:collapse;color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px">Regards</span><span class="Apple-style-span" style="border-collapse:collapse;color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px"> </span></div>
<div><font class="Apple-style-span" color="#222222" face="arial, sans-serif"><span class="Apple-style-span" style="border-collapse:collapse"> </span></font></div><div><font class="Apple-style-span" color="#222222" face="arial, sans-serif"><span class="Apple-style-span" style="border-collapse:collapse"><br>
</span></font></div><div><span class="Apple-style-span" style="border-collapse:collapse;color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px"><br></span></div><div><span class="Apple-style-span" style="border-collapse:collapse;color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px"> </span></div>
<div><br><div class="gmail_quote">On Sun, Jul 15, 2012 at 7:01 PM, David Doria <span dir="ltr"><<a href="mailto:daviddoria@gmail.com" target="_blank">daviddoria@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="gmail_quote"><div>On Sun, Jul 15, 2012 at 6:35 PM, Yixun Liu <span dir="ltr"><<a href="mailto:yxliuwm@gmail.com" target="_blank">yxliuwm@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>The direction of the displacement is from output to input.</div>
<div> </div>
<div>Yixun<br><br></div></blockquote><div><br></div></div><div>Fotis,</div><div><br></div><div>Now that Yixun has answered your question, it would be great if you would add this information to the Doxygen documentation so that others do not have the same confusion in the future. When you go to this page:</div>
<div><br></div><a href="http://www.itk.org/Doxygen/html/classitk_1_1WarpImageFilter.html" target="_blank">http://www.itk.org/Doxygen/html/classitk_1_1WarpImageFilter.html</a><br clear="all"><br>you will find an "Edit Comments" link near the class name at the top. It will allow you to edit the comment for the SetDisplacementField() function so you can include this crucial information. Alternatively, you could manually push a documentation patch to Gerrit, but this web interface has been designed so that you do not need to know how to do it manually for such a small patch :)<br>
<br>Please let us know if you have any problems,</div><div class="gmail_quote"><br>David</div>
</blockquote></div><br></div>