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Hi David,<br>
<br>
thank you. I'll take a look at your class.<br>
<br>
Regards<br>
Imre<br>
<br>
<div class="moz-cite-prefix">Am 29.12.2015 um 13:07 schrieb David
Gobbi:<br>
</div>
<blockquote
cite="mid:CANwS1=Hf4iWqET_B8miyx-KBL=GYopGeTWpCBm-0c=VMwheNyw@mail.gmail.com"
type="cite">
<div dir="ltr">Hi Imre,
<div><br>
</div>
<div>I have a connectivity filter that works directly on images,
it can label connected regions according to size and it should
be much faster (probably 1000x) than doing voxel checks via
polydata:</div>
<div><a moz-do-not-send="true"
href="https://github.com/dgobbi/AIRS/blob/master/ImageSegmentation/vtkImageConnectivityFilter.h">https://github.com/dgobbi/AIRS/blob/master/ImageSegmentation/vtkImageConnectivityFilter.h</a></div>
<div>I'll probably be contributing this filter to VTK sometime
in the near future.</div>
<div><br>
</div>
<div> - David</div>
<div><br>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Tue, Dec 29, 2015 at 4:02 AM,
Imre Goretzki <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:goretzki.imre@gmail.com" target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:goretzki.imre@gmail.com">goretzki.imre@gmail.com</a></a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> Is there an
easier way in ITK?<br>
<br>
Thanks<span class=""><font color="#888888"><br>
Imre</font></span>
<div>
<div class="h5"><br>
<br>
<div>Am 28.12.2015 um 23:38 schrieb Imre Goretzki:<br>
</div>
<blockquote type="cite"> Hey guys,<br>
<br>
I use the vtkPolyDataConnectivityFilter from
polydata to extract several different and more
or less unknown regions. <br>
My problem is that I want to extract regions
from this filter, but if I do this, the update
process for all regions takes up to 10minutes:<br>
<br>
filter->SetExtractionModeToAllRegions();<br>
filter->Update();<br>
...<br>
<br>
for (int i = 0; i <
filter->GetNumberOfExtractedRegions(); i++)<br>
{<br>
extractFilter->InitializeSpecifiedRegionList();<br>
extractFilter->AddSpecifiedRegion(i);<br>
extractFilter->Modified();<br>
extractFilter->Update();<br>
extractRegionData->DeepCopy(extractFilter->GetOutput());<br>
}<br>
extractFilter->InitializeSpecifiedRegionList();<br>
<br>
Background for this: I want to use the points of
each region to check whether they lie within an
object in my binary<br>
mask image. So the pipeline would be like this:<br>
<br>
1) Get all Regions <br>
2) get region <i>i</i><br>
3) get points of region <i>i</i><br>
4) check if point <i>j</i> lies
within the binary mask <i>B</i> (<i>B</i>_<i>j</i>
== 255)<br>
4a) if true then add region to
the extractFilter and break (-> next region <i>i</i>)<br>
4b) if false then continue with
next point <i>j</i><br>
5) Mark all regions red (done easily)<br>
6) Mark some regions green that are above a
specific size (can be accessed with
filter->GetRegionSizes() )<br>
7) Mark some regions yellow (the regions that
are extracted during step 1-4a) <br>
<br>
I do not know if the PolyDataConnectivityFilter
is the right class for this, I think it is. <br>
If I store the extractRegionData in a vector,
all regions have the same number of points
(which is kind of strange) but different number
of cells (region size == number of cells is
correct).<br>
<br>
I would now try to get the points from the cells
and check the binary mask, because the <br>
<br>
vtkPolyData->GetNumberOfPoints()<br>
<br>
and<br>
<br>
vtkPolyData->GetPoint(pointCounter, point); <br>
<br>
are not working correctly in this scenario (all
regions are extracted because every single
region has every point?<br>
i did not verify my guess but I think there
would be the problem)<br>
<br>
The binary mask is a vtkImageData, that could be
transformed to vtkPolyData.<br>
The input image (already filtered with
vtkMarchingCubes) and the binary mask have the
same dimensions (x,y,z).<br>
<br>
I hope you can imagine what I'm trying to do and
have some tips for me, if my approach is
correct.<br>
<br>
Regards<br>
Imre<br>
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