[Insight-users] neighborhood iterator

[robert tamburo]

Check out the ShapedNeighborhoodIterator class. I have not used it before,
but the description sounds like it may work. You can set the neighborhood
pixels to iterate by adding the offsets to an active list.

On Wed, Feb 16, 2011 at 1:13 PM, Jiao Lin <jiao.lin at gmail.com> wrote:

> Hi Robert,
>
> Thanks for your quick response! That is certainly a solution. But the
> SetLocation method is not optimized for speed so I wonder if there is
> a better way to do it.
>
> --Jiao
>
> On Wed, Feb 16, 2011 at 10:11 AM, robert tamburo
> <robert.tamburo at gmail.com> wrote:
> > As you iterate the image, check to see if you're on the grid. If you are,
> > then set and iterate the neighborhood. Something like:
> > while(!it.IsAtEnd())
> >   {
> >   index = it.GetIndex();
> >   if( (index[0] % 2 == 0) && (index[1] % 3 == 0) )  // or whatever
> >     {
> >     neighborhoodIt.SetLocation(index);
> >     // iterateTheNeighborhood
> >     .
> >     .
> >     .
> >     }
> >   ++it;
> >   }
> >
> > On Wed, Feb 16, 2011 at 12:40 PM, linjiao <jiao.lin at gmail.com> wrote:
> >>
> >> Have a question regarding neighborhood iterator. My understanding is
> that
> >> after creating a neighborhood iterator, one can move the center of a
> >> neighborhood around an image region by increment the iterator:
> >>
> >> while (!it.IsAtEnd()) {
> >>  ...
> >>  ++it;
> >> }
> >>
> >> Each increment will bring the center to the next pixel in the image
> >> region.
> >> I am now wondering if it is possible to define a "grid" in the image
> >> region,
> >> and only let the center to move to the next pixel in that grid.
> >>
> >> So for example, we have a 10X10 image, right now we can define a
> >> neighborhood iterator whose center walks like this
> >>
> >> (0,0), (1,0), (2,0), .... (9,0), (0,1), (1,1) ....
> >>
> >> I am wondering if we can define a neighborhood iterator whose center
> walks
> >> in 2 steps in x direction, and 3 steps in y direction
> >>
> >> (0,0), (2,0), (4,0), ... (8,0), (0,3), (2,3), (4,3), ...
> >>
> >> Any hints are very appreciated.
> >>
> >> --Jiao
> >> --
> >> View this message in context:
> >> http://old.nabble.com/neighborhood-iterator-tp30936654p30936654.html
> >> Sent from the ITK - Users mailing list archive at Nabble.com.
> >>
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