[Insight-users] Quickly get the Number of points of ConnectedThresholdImageFilter's output

[jerry z]

Hi all,
I need to know the number of points ConnectedThresholdImageFilter's output
contains.

I am trying to get that from:

            itk.itkImageRegionIterator_ISS3 iterator = new
itkImageRegionIterator_ISS3(
                connectedThresholdOutput,
                connectedThresholdOutput.LargestPossibleRegion);
            
            int count = 0;
            for (iterator.GoToBegin(); !iterator.IsAtEnd; iterator++)
            {
                short value = iterator.Get().ValueAsSS;
                if (value == 1)
                {
                    count++;
                }
            }

But it tooks 2 seconds while ConnectedThresholdImageFilter.GetOutput only
took 153ms.
Is there a faster way?

Regards,

Jerry



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