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<div class="moz-cite-prefix"><font size="-1">From the previous mails
I'd assume you tried this as a starting point but just in case:
you did try to pass a smaller region as requested region for the
output (filter->GetOutput()->SetRequestedRegion(my_region)
before calling filter->Update()), didn't you? From a quick
glance at the cascade of filters which the DemonsImageFilter
inherits from, it's not obvious that the filter does not respect
the requested region set by the user for the output.<br>
<br>
Otherwise, assuming your images are already affinely registered,
it should be fairly safe to only run the algorithm on cropped
images as suggested, yes, especially if you expect the motion at
the boundary of your smaller domain to be roughly null.<br>
<br>
Another silly question/comment in case none of the above helps,
and before you decide to invest time adapting the code: is the
runtime of the demons algorithm an annoying bottleneck to you?
I'd imagine it's one of the fastest algorithms out there. If
it's fast enough, maybe you can just run it on the full images
regardless. <br>
<br>
Le 31/10/2015 17:07, Nhung Pham a écrit :<br>
</font></div>
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cite="mid:CAARpg10Ptegj8O2dOKMOHoptrH_5pmV1NXrjWfD2KEL6CgmVUA@mail.gmail.com"
type="cite">
<div dir="ltr"><font size="-1">Normally with Python, I can
register one template( e.g: a center region of reference
image) to the target image to find the corresponding position
of the template in the target image. In this Demon
Registration algorithm, we of course do not know the position
of the template in the fixed image, so my goal is not to
register two smaller images but to find the best match of the
small region in the fixed image, or do you mean I should do
registration with small regions of fixed image iteratively?
(Sorry, my English is not so good)</font></div>
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<div><font size="-1">Best regards,</font></div>
<div><font size="-1">===============================</font>
<div><font size="-1">Phạm Hồng
Nhung,</font></div>
<div><font size="-1">ICT
Department,</font></div>
<div><font size="-1">University of
Science and Technology of
Hanoi.</font></div>
<div>
<div><font size="-1">Mobile:
+84979093732</font></div>
<div><font size="-1">Gmail: <a
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href="mailto:phnhung98@gmail.com"
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<div class="gmail_quote"><font size="-1">On Sat, Oct 31, 2015 at
4:51 PM, Dženan Zukić <span dir="ltr"><<a
moz-do-not-send="true" href="mailto:dzenanz@gmail.com"
target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:dzenanz@gmail.com">dzenanz@gmail.com</a></a>></span> wrote:<br>
</font>
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.8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div class="gmail_default"
style="font-family:verdana,sans-serif;font-size:small"><font
size="-1">Have you tried extracting only the regions
of interest using <a moz-do-not-send="true"
href="http://www.itk.org/Doxygen/html/classitk_1_1RegionOfInterestImageFilter.html"
target="_blank">RoI</a> filter and registering these
two smaller images? That is the usual workaround if
some filter does not respect requested region.</font></div>
<div class="gmail_default"
style="font-family:verdana,sans-serif;font-size:small"><font
size="-1"><br>
</font></div>
<div class="gmail_default"
style="font-family:verdana,sans-serif;font-size:small"><font
size="-1">HTH</font></div>
</div>
<div class="gmail_extra"><font size="-1"><br>
</font>
<div class="gmail_quote"><font size="-1">On Thu, Oct 29,
2015 at 9:49 AM, HONG NHUNG PHAM <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:hong.nhung.pham@univ-poitiers.fr"
target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:hong.nhung.pham@univ-poitiers.fr">hong.nhung.pham@univ-poitiers.fr</a></a>></span>
wrote:<br>
</font>
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.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div
style="font-family:arial,helvetica,sans-serif;font-size:12pt;color:#000000">
<div><font size="-1">Hello everyone,</font></div>
<div><font size="-1"><br>
</font></div>
<div><font size="-1">I want to apply Demons
Registration to register two medical images,
the image information is strong at the center,
therefore I want to apply registration method
on only the center region of the images. For
example, take a center region of moving image,
and find the corresponding positions of each
pixel of the region in the fixed image.
However, I can not find a method that allows
processing on a region like that in
itkDemonsRegistrationFilter.h. I tried passing
the full fixed image as SetFixedImage, and
only the center region of moving image as
SetMovingImage. However, it crashes because it
requires same size of fixed image and moving
image. </font></div>
<div><font size="-1"><br>
</font></div>
<div><font size="-1">Does anyone have any idea of
how to pass a region to demons registration
filter?</font></div>
<div><font size="-1"><br>
</font></div>
<div><font size="-1">Thank you in advance! </font></div>
<div><font size="-1"><br>
</font></div>
<div><font size="-1"><br>
</font></div>
</div>
</div>
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