[Insight-developers] Gaussian filtering.

[Joshua Cates]

Hi Mark,

Feel free to add a SetStandardDeviation and 
SetStandardDeviationWorldCoordinates (or however you want to name them) 
to the DiscreteGaussianImageFilter if you would like.  Consistency is 
nice.  These are some of the things (way down) on my todo list.

Josh.

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


On Mon, 28 Apr 2003, Mark Foskey wrote:

> Shouldn't we make the variance parameter consistent in name and what 
> coordinates it uses?
> 
> Miller, James V (Research) wrote:
> > RecursiveGaussianImageFilter measures Sigma in world coordinates.
> > 
> > DiscreteGaussianImageFilter measures Variance in pixels.
> > 
> > I used the DiscreteGaussian for small kernels and when I will be taking
> > many different types of digital derivatives of the smoothed image.
> > 
> > I use the RecursiveGaussian for large kernels and when I want to take the
> > derivative of a smoothed image in one step.
> > 
> > 
> > 
> > 
> > 
> >>-----Original Message-----
> >>From: Mark Foskey [mailto:mark_foskey@unc.edu]
> >>Sent: Monday, April 28, 2003 11:24 AM
> >>To: insight-developers@public.kitware.com
> >>Subject: [Insight-developers] Gaussian filtering.
> >>
> >>
> >>In itk::RecursiveGaussianImageFilter, is Sigma measured in pixels? 
> >>Assuming that it is, do we want to have an easy way select a sigma in 
> >>world coordinates?  With anisotropic voxels, it might be nice 
> >>if there 
> >>were an easy way to simulate a spherical convolution kernel.
> >>
> >>Also, when would you want to use DiscreteGaussianImageFilter 
> >>instead of 
> >>the Recursive version?  Is there a rule of thumb, along the lines of 
> >>"if you aren't sure, use this one"?  Are there other Gaussian 
> >>blurring 
> >>filters I haven't noticed?
> >>
> >>-- 
> >>Mark Foskey    (919) 843-5436  Computer-Aided Diagnosis and 
> >>Display Lab
> >>mark_foskey@unc.edu            Department of Radiology, CB 7515, UNC
> >>http://www.cs.unc.edu/~foskey  Chapel Hill, NC  27599-7515
> >>
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> >>
> > 
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> 
> -- 
> Mark Foskey    (919) 843-5436  Computer-Aided Diagnosis and Display Lab
> mark_foskey@unc.edu            Department of Radiology, CB 7515, UNC
> http://www.cs.unc.edu/~foskey  Chapel Hill, NC  27599-7515
> 
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