[ITK-users] [ITK] Counting the number of pixels with specific color

[Timothee Evain]

Hello,

One simple way to do it is to use an iterator and count voxels.
You could use something like:

itk::ImageRegionConstIterator<ImageType> MyIt(MyImage,MyImage->GetLargestPossibleRegion());
MyIt.GoToBegin();
int Volume=0;
while (!MyIt.IsAtEnd())
{
if (MyIt.Get()==255) //Or whatever value is your white pixel
{ 
Volume+=1;
}
++MyIt;
}

You could also use the LabelMap workflow to detect volume of different labels.

HTH,

Tim

----- Mail original -----
De: "karolkc" <karolkc at gmail.com>
À: insight-users at itk.org
Envoyé: Vendredi 15 Avril 2016 19:37:47
Objet: [ITK] [ITK-users] Counting the number of pixels with specific color

Hello,

I would like to ask if there is a function in ITK that could count the
number of pixels with specific color.

I have already used Region Growing filter for segmentation, then I created
an image containing white pixels on black background presenting my segmented
region. 

Now I'd like to calculate the volume of this region. The simplest way is
just to calculate the number of white pixels. But how?

Do you have any ideas or suggestions?

Best Regards!



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