[Insight-users] Testing GPU-based Median Filters

[Bradley Lowekamp]

Hello,

Just a quick comment about one of your questions.

On Jan 11, 2010, at 6:18 PM, Christopher Share wrote:

> Hi,
> 
> I'm in the process of developing several different GPU-based median filters for the ITK (as part of the 09/10 VPAC Summer Project - this year's project doesn't have a web page yet but here's a link to last years' - http://www.vpac.org/?q=node/290). I have a question regarding the testing of the filters. I'd like to test the performance of the GPU filters under different conditions, however I'm not clear about how these filters are used in practice.
> 
> For the purposes of testing the filters I have the following questions:
> 
> 1. What image sizes should be tested? I was thinking of "small", "medium" and "large" but I'm not sure what these sizes would be wrt to the ITK. 
> 
> 2. Should I test RGB/RGBA images as well as greyscale images?

The current MeanImageFilter does not work with RGB, and RGBA pixel types for the reasons outlined in section 4.1.5 of the "ITK Software Guide". I am not saying I agree with this, but it's how it is.

> 
> 3. For the median filter case, what radius's should be tested? Should different radius's in different directions be tested?

I test the boundary cases, if the documentation says the parameters are valid then it should work, or else some one will call it a bug.

> 
> Cheers,
> 
> Chris Share
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========================================================
Bradley Lowekamp  
Lockheed Martin Contractor for
Office of High Performance Computing and Communications
National Library of Medicine 
blowekamp at mail.nih.gov


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