[Insight-users] A question about neighborhood iterator and image iterator

[Joshua Cates]

Hi Feng,

If you initialize a Neighborhood iterator and a normal Region iterator
over the same region, they are guaranteed (by design) to walk the region
indicies in the same order.

Josh.
______________________________
 Josh Cates			
 Scientific Computing and Imaging Institute
 University of Utah
 Email: cates at sci . utah . edu
 Phone: (801) 587-7697
 URL:   http://www . sci . utah . edu/~cates


On Fri, 3 Oct 2003, Feng Ma wrote:

> Hi, Josh and Luis:
> 
>   I am a little confused about how to use neighborhood iterator and image 
> iterator. Josh has a code example in ITK Neighborhood ppt file:
> 
>     typedef itk::Image<float, 3> ImageType;
>     ImageType::Pointer image = SomeImageSource->GetOutput();
> 
>     itk::ConstNeighborhoodIterator<ImageType> it(radius, image,
>                                                         
> image->GetRequestedRegion());
>     itk::ImageRegionIterator<ImageType> out(output_image,
> 									   image->GetRequestedRegion());
> 
>     for (it.GoToBegin(); ! it.IsAtEnd(); ++it, ++out)
>     {
>        out.Set(0.5 * it.GetNext(2) -  0.5 * it.GetPrevious(2));
>     }
> 
>   How does ITK internal mechanism make sure that neighborhood iterator it 
> and image region iterator out are always visiting the same pixel in image?
> 
>   Thanks.
> 
> -Feng
> 
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