[Insight-developers] Gaussian filtering.

[Miller, James V (Research)]

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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