Hi Luis, all,<br><br>My fault, seems a false alarm :S I was pretty sure I had an InsideBuffer() check in all Evaluate() calls (I have several of these) but this one was missing. Then it reminded me the linear interpolator bug I had, but this seem to have been fixed when ITK_USE_PIXEL_CENTERED_COORDINATES_CONSISTENTLY is used (thanks for this to the author btw). I tried several times and it seems to be robust, at least I could not reproduce any error at the image borders. I will try to check that the rest of programs that were failing due to
this old bug are now working with the latest changes in this class.<br><br>Anyway, a method or something could be considered in order to check which is actually the image region covered by the interpolator.<br><br>Sorry for the inconvenience <br>
<br>Iván<br><br><br><div class="gmail_quote">2010/6/17 Luis Ibanez <span dir="ltr"><<a href="mailto:luis.ibanez@kitware.com">luis.ibanez@kitware.com</a>></span><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Hi Ivan,<br><br>From your description, this looks like a bug in the IsInsideBuffer() method.<br><br>It would seem that the method that we use in the IsInsideBuffer() method<br>is not consistent with what we do when we call Evaluate().<br>
<br>Could you provide a minimal example that illustrates this problem ?<br><br><br> Thanks<br><br><br> Luis<br><br><br>-------------------------------------------------------------<br><div class="gmail_quote">
2010/6/17 Iván Macía <span dir="ltr"><<a href="mailto:imacia@vicomtech.org" target="_blank">imacia@vicomtech.org</a>></span><br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div><div></div><div class="h5">
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<p class="MsoNormal"><span style="color: rgb(31, 73, 125);" lang="EN-US">Dear all,</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);" lang="EN-US">I am experiencing an
extremely annoying problem again and again in recent developments when I
perform calculations that rely on linear interpolators. This is related to the
fact that, even if I check if the point is inside the buffer (
interpolator->IsInsideBuffer( point ), when performing the interpolation
sometimes the buffer tries to access and index that is outside bounds and the
program crashes, because the interpolated point lies very close to the
boundaries. This at least happens with LinearInterpolateImageFunction. I even
had to implement my own dirty interpolator with extra bounds checking, which is
slower but safer.</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);" lang="EN-US">Should not the
interpolator check if any of the indexes that it has to access might be out of
bounds? If so I can open an issue in Mantis with an example test program (I
cannot post this right now since I have to extract the offending code from my
prototype). How could this be handled without severely affecting the performance?
Somehow each interpolator knows which would be the extent of pixels that will
be accessed but I think this is not made explicit anywhere in the interpolator.</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);" lang="EN-US">Any other ideas to
tackle this problem?</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);" lang="EN-US">Thanks in advance.</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);" lang="EN-US">Iván Macía</span></p>
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