[Insight-users] How to use conditional iterators

[Miller, James V (Research)]

Conditional iterators based on flood fill operations (region 
growing) are used in the

Code/BasicFilters/itkConnectedThresholdImageFilter.[h|txx]
Code/BasicFilters/itkIsolatedConnectedImageFilter.[h|txx]
Code/BasicFilters/itkNeighborhoodConnectedImageFilter.[h|txx]
Code/BasicFilters/itkConfidenceConnectedImageFilter.[h|txx]

You basically define an ImageFunction that returns true or false
based on whether a given pixel meets the condition or not.  

I believe that the conditional iterators can also be used to
traverse an entire image and skip over pixels that do not 
meet the condition.  But I have never used them that way. I 
have only used the flood fill variants.  But the idea is basically
the same.  You defined an image function and use an iterator 
to walk a region.  If a pixel does not satisfy the image function
the iterator will skip over it.

Jim 




> -----Original Message-----
> From: Dr. Jorg Seemann (V2T) [mailto:seemann at v2t . de]
> Sent: Monday, June 23, 2003 2:32 PM
> To: insight-users at itk . org
> Subject: [Insight-users] How to use conditional iterators
> 
> 
> Dear ITK users,
> 
> I like to use a conditional iterator to walk over all pixels 
> of an image
> with a grey value exceeding a threshold. My intention is to 
> apply some image
> processing algorithms to the selected pixels and to write the 
> result to an
> output image.
> 
> Has somebody written an example or can give me a hint how to 
> define and to
> use the iterator?
> 
> Best regards,
> 
> Jorg
> 
> 
> 
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