[Insight-developers] Gaussian filtering.

[Mark Foskey]

Thanks for the info -- I've added some of it to the documentation for 
those classes.  For the Discrete filter, I also documented some of the 
parameters, which had not been done.  (See the get/set methods.)  I 
couldn't figure out FilterDimensionality (how can that be different 
from the image dimensionality?) so if someone wants to add a comment 
for that, it'd be great.

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