[Insight-developers] CurvatureAnisotropicDiffusionTest failing

[Bill Lorensen]

Great!

I just added a few more Filtering tests that involve anisotropic diffusion. I think these examples also need tuning. The smoothed output does not look smoothed to me. The examples are VectorGradient, VectorCurvature, RGBGradient and RGBCurvatureAnisotropicDiffusion filters.

Luis, could you verify that these need to be tuned. Then we can change the baselines.

Bill

At 07:38 AM 3/20/03 -0500, Luis Ibanez wrote:
>Hi Bill,
>
>It's great to have the regression testing working !
>
>---
>
>Looking at the images,
>http://www.itk.org/Testing/Sites/starsend.kitware.com/WinXP-VC7/20030320-1144-Experimental/Results/__Examples_Filtering_CurvatureAnisotropicDiffusionImageFilterTest.html
>
>Here is what seems to happen,
>
>Some day ago a glitch was found in the anisotropic diffusion
>filters that was preventing the TimeStep from being used.
>
>That is, the User settings were not being honored. Instead,
>a default time step was always being used.  Josh rapidly
>fixed this bug, and as a consequence all the code that was
>using anisotropic filters suddenly started to actually use
>the TimeStep parameters. It happened that most of these settings
>were incorrectly tuned, often leading to numerical instabilities.
>
>The Baselineimage for this filter seems to have been generated
>just after the bug was fixed but before the new parameters were
>tunned. The 'chekers'-like  appearance of the image is due to
>the numerical instabilities originated from too large values
>of the time step.
>
>So, to summarize:
>
>  Please update the Baseline image with the current one.
>  The smooth image appearing as "Testimage" is the right one.
>
>
>BTW, this may be happening with other tests...
>
>
>    Luis
>
>
>-----------------
>Lorensen, William E (Research) wrote:
>>Luis and Josh,
>>The subject regression test from Examples/Filtering is failing. I think the
>>changes Josh made yesterday to the filter have had an effect. Do you want me
>>check in a new baseline image or is there a problem?
>>http://public.kitware.com/Insight/Testing/HTML/TestingResults/Sites/coffee.k
>>itware/Linux-gcc296/20030320-0500-Nightly/Results/__Examples_Filtering_Curva
>>tureAnisotropicDiffusionImageFilterTest.html
>>Bill
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>
>
>
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