[Insight-users] GradientImageFilter vs GradientRecursiveGaussianImageFilter

[Will Schroeder]

Hi Pieter-

I believe that I am speaking for the whole group of ITK developers here: we 
very much appreciate your patient evaluation of ITK. Your work goes a long 
way to making the system realize its true potential and towards building 
the ITK community. Thank you.

We will correct the inconsistency.

Will

At 11:54 AM 4/25/2002 +0200, Pieter Vos wrote:
>Hello,
>
>I compaired the outputs of the filter GradientImageFilter and the
>GradientRecursiveGaussianImageFilter.
>Both filters had the same 3D image: a black image with a white spot in the
>middle. The vectoroutputs however, where not the same:
>
>The vectors of the GradientImageFilter where pointing away form the spot.
>
>------------------
>|
>|       ^
>|       |
>|    <-   ->
>|    <-   ->
>|       |
>|
>|
>------------------
>
>And the vectors of the GradientRecursiveGaussian where pointing to the
>white spot:
>
>------------------
>|
>|
>|        |
>|    ->     <-
>|    ->     <-
>|        ^
>|        |
>|
>------------------
>
>The second picture is as how it should be.
>
>So, am I forgetting some basic theory (and should I study again)
>or should the outcome of the GradientImageFilter not be the opposite?
>
>Please help.
>
>Greetings,
>
>--
>Pieter Vos
>UMC Radboud Nijmegen
>The Netherlands
>mailto:pieterv@radiology.azn.nl
>
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