[Insight-developers] Re: ShapedNeighborhoodIterators

[Joshua Cates]

Hi Jim,

Yes, the best options are GetNext/Previous and the shaped iterator.  In 
theory the shaped iterator should be faster.  The trade-off is a more 
limited API for accessing and setting pixels, which could make your code a 
little uglier.

Currently you will have to manually activate the face connected neighbors
and the center pixel.  Probably we should set up an 
ActivateFaceConnectedNeighbors() method since this is likely a common 
case.

Let me know if you have problems/suggestions as so far I have not made 
very extensive use of the shaped iterators.

Josh.


______________________________
 Josh Cates			
 School of Computer Science	
 University of Utah
 Email: cates at sci . utah . edu
 Phone: (801) 587-7697
 URL:   http://www . sci . utah . edu/~cates


On Tue, 27 May 2003, Miller, James V (Research) wrote:

> Josh,
>  
> What is the recommended way to access the face connected neighbors of a
> pixel using the NeighborhoodIterators? The options seem to be
> NeighborhoodIterator:GetNext()/GetPrevious() and setting up a
> ShapedNeighborhoodIterator.
>  
> The ShapedNeighborhoodIterator "should" be faster when moving the iterator
> since it only updates a few of the pointers.  But are there convenience
> methods for activating the face connected neighbors (and the center pixel)
> of an iterator? Or do I need to call ActivateOffset() manually for each face
> connected pixel?
>  
> Jim
>  
>  
> 
> Jim Miller 
> _____________________________________
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> 
> james . miller at research . ge . com
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> 
>  
>