[Insight-users] neighborhood of a neighborhood

[Miller, James V (Research)]

This may be the same as Josh suggested:

The key here is that an iterator walks a prescribed region. So use two 
neighborhood iterators.  The first walks the full region of interest and 
has a large radius.  As the first iteration moves, you define a region off
this iterator (convert its location and radius to an start index and size 
for a region, start index = location - radius, size = 2*radius+1).  Define
a second iterator that walks this newly defined region.

    outer_iter = NeighborhoodIteratorType(largeRadius,
                                      this->GetInput(), largeRegion);
    while ( !outer_iter.IsAtEnd() )
      {
      // these next two lines probably won't compile, but you get the idea.
      smallRegion.SetIndex( outer_iter.GetLocation() - 2 * largeRadius );
      smallRegion.SetSize( 2 * largeRadius + 1 );

	inner_iter = NeighborhoodIterator(smallRadius, this->GetInput(),
smallRegion);	 

      while ( !inner_iter.IsAtEnd() )
        {
	  // do something

        ++inner_iter;
        }	    

      ++outer_iter;
      }


> -----Original Message-----
> From: Joshua Cates [mailto:cates at sci . utah . edu]
> Sent: Wednesday, August 27, 2003 1:21 PM
> To: John M. Galeotti
> Cc: insight-developers at itk . org; insight-users at itk . org
> Subject: Re: [Insight-users] neighborhood of a neighborhood
> 
> 
> Hi John
> 
> One way to do this would be to define a region R and a neighborhood 
> iterator N on R.  You would have to "manually" iterate R through the 
> image by incrementing its Index and modifying the Size.  You 
> could grab 
> the Index from a regular iterator moving through the image.
> 
> Josh.
> 
> On Tue, 26 Aug 2003, John M. Galeotti wrote:
> 
> > Is it possible to iterate a small neighborhood through a large 
> > neighborhood which is itself iterating through a much larger image?
> > 
> > John Galeotti
> > jgaleotti at cmu . edu
> > 
> > _______________________________________________
> > Insight-users mailing list
> > Insight-users at itk . org
> > http://www . itk . org/mailman/listinfo/insight-users
> > 
> 
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