[Insight-users] GetPixel() in LabelMap images.

[Cagatay Bilgin]

Hi Sergio,

I don't see any problems with the code you
attached. What you are observing might be
due to code you have not attached. Are you
making sure to call update on the filter that
gives you the label map prior to this piece of
code? That would be my
first guess. My second guess would be that
the foreground/background values you use
in your binaryimagetolabelmap filter might be
set incorrectly resulting in an empty labelmap.

In any case, it is always a good idea to attach
minimal code that compiles and illustrates the
problem with the input image you use.

Let us know,
Cagatay

On Thu, Jun 21, 2012 at 9:51 AM, Sergio Vera <sergio.vera at alma3d.com> wrote:

> Hello all!
>
> I have a LabelMap Image and I want to remove all labels except the ones
> that have a seed.
>
> Sadly,
>
> std::vector<size_t> selectedLabels;
> BOOST_FOREACH(const ITKImgInType::IndexType& seed, d_seeds) {
>   ITKImgInType::PixelType value = labelMap->GetPixel(seed);
>   if (value != 0) {
>     selectedLabels.push_back(value);
>     d_os << "Label " << value << " has been selected as a valid label.\n";
>   } else {
>     d_os << "0 found on " << seed << " :( \n";
>   }
> }
>
> always return a zero value, even if there should be a correct label in
> that seed position (I've checked that on the binary image that generated
> the LabelMap). The label map has over 1000 LabelObjects
>
> Theoretically LabelImages support the GetPixel() Method (even if it's
> slower).
>
> Any ideas on why this may be happening? I'm using itk 3.20.0 on windows.
>
> Thanks in advance
>
> --
> Sergio Vera
>
>  Alma IT Systems
>  C/ Vilana, 4B, 4º 1ª
>  08022 Barcelona
>  T. (+34) 932 380 592
>  www.alma3d.com
>
> _____________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Kitware offers ITK Training Courses, for more information visit:
> http://www.kitware.com/products/protraining.php
>
> Please keep messages on-topic and check the ITK FAQ at:
> http://www.itk.org/Wiki/ITK_FAQ
>
> Follow this link to subscribe/unsubscribe:
> http://www.itk.org/mailman/listinfo/insight-users
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.itk.org/pipermail/insight-users/attachments/20120621/6948bd47/attachment.htm>