[Insight-developers] Calculators: Buffered or Requested regions?

[Luis Ibanez]

Hi Jim,

That sounds like a good idea.

It will be pretty useful to select the region over which the
computation is going to be performed.  We could still agree
in using the RequestedRegion() as the default region.


   Luis



-------------------------------------
Miller, James V (Research) wrote:
> I was just looking through some of the calculators.  The 
> MinimumMaximumImageCalculator performs its calculation across the 
> RequestedRegion. The OtsuThresholdImageCalculator performs its 
> calculation over the BufferedRegion.
>  
> So there is an inconsistency here.  Besides the inconsistency, the Otsu 
> method uses the MinimumMaximum to determine how to build its own 
> histogram.  So the range of values for its histogram is based on the 
> pixels in the RequestedRegion but it determines a threshold from the 
> histogram based on the BufferedRegion.  This inconsistency could bias 
> the threshold calculated.
>  
> At a minimum, I would think the calculators should be consistent.  I 
> could make a case for either region being appropriate (more than I want 
> to get into here).  Perhaps the calculators should take a region over 
> which to perform the calculation?
>  
>  
> *Jim Miller*
> */_____________________________________/*
> /Visualization & Computer Vision//
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> 
> /_james . miller at research . ge . com_/
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> 
>