[Insight-users] Simultaneous iterators

[Dan Mueller]

Hi David,

Perhaps you could store your four images as one vector image, and then
use one iterator...

HTH

Cheers, Dan

On 15 December 2010 13:48, David Doria <daviddoria at gmail.com> wrote:
> I have identified a bottleneck in my program to be a function
> (PatchDifference()). The callgraph is here:
> http://rpi.edu/~doriad/callgraph.jpg
>
> The function looks like this:
>
>  itk::ImageRegionConstIterator<TImage> queryPatchIterator(image, queryRegion);
>  itk::ImageRegionConstIterator<TMask> queryMaskIterator(mask, queryRegion);
>
>  itk::ImageRegionConstIterator<TImage> currentPatchIterator(image,
> currentRegion);
>  itk::ImageRegionConstIterator<TMask> currentMaskIterator(mask, currentRegion);
>
>  while(!queryPatchIterator.IsAtEnd())
>    {
>    // Do a small computation with the 4 pixels here
>
>    ++queryPatchIterator;
>    ++currentPatchIterator;
>    ++queryMaskIterator;
>    ++currentMaskIterator;
>    }
>
> You can see that almost 20% of the total program time is spent in each
> of these iterator ++ functions. Is there a faster way to do this?
>
> Thanks,
>
> David
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