[Insight-users] GetLargestPossibleRegion() and GetBufferedRegion()

[Luis Ibanez]

Hi Andrew,

Please read the ITK Software Guide

   http://www.itk.org/ItkSoftwareGuide.pdf

where the difference between the regions
is explained in detail.

---

In summary:

* LargestPossibleRegion is the total size of the image

* BufferedRegion is the portion of the image that is
                  currently loaded in memory
* RequestedRegion is the portion that the pipeline
                  request from a filter at the moment
                  of execution.


If you are writing a filter, you should only generate
the RequestedRegion.

If you are planning to visit pixels with Image Iterators
you should use *at most* the BufferedRegion

If you are computing features from the entire image
geometry, then you should use the LargestPossibleRegion.


The concepts of these three regions are closely related
to streaming.


Regards,


    Luis



----------------
Andrew Li wrote:
> Dear ITK users:
> 
> It seems to me that both GetLargestPossibleRegion() and
> GetBufferedRegion()are available to some (if not all) image filter
> classes. They are both mentioned in itkSoftwareGuide and they are both
> used in our current code.
> 
> Is there any difference between those two functions? 
> 
> If they are different in some cases, is there a way to decide which one
> to use? 
> For example, the input to a function is a pointer to <a
> filter>.GetOutput(). Could and how this function choose which one to
> use?
> 
> I appreciate your help. 
> 
> -Andrew
>  
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