[vtkusers] vtkImageErode3D

[Jon Haitz Legarreta]

Dear Elena,
another alternative would be to vary the kernel size to some extreme values
so that you can really be aware of any changes.
Another possibility would be to use the erode/dilate filters separately.
And yes, you are right, if you erode an object to the ground it cannot be
dilated anymore however hard you try.

HTH,
JON HAITZ


On 27 November 2013 13:29, Marco Nawijn <nawijn at gmail.com> wrote:

> Hi Elena,
>
> Although I probably cannot help you directly, I would advise you
> isolate your problem to the smallest compilable piece of code
> and post this so experts can take a look at it. One thing that
> bit me in the past is that ones you apply a filter, you have to
> a.) call Update() on it and b.) call GetOutput() to get the result
> you are looking for. Without seeing your code however it is
> difficult to judge.
>
> Kind regards,
>
> Marco
>
> P.S. There is nothing wrong with your english!
>
>
>
> On Wed, Nov 27, 2013 at 12:24 PM, elena bresciani <
> elena.bresciani87 at gmail.com> wrote:
>
>> I'm getting started with vtk and I'm still unable to solve a lot of
>> problems.
>>
>> I'm trying to apply the vtk filter vtkImageDilateErode3D to a CT image
>> but I
>> can't obtain the result I'm looking for.
>> In fact I expect the result to be a at least slightly different image but
>> the output is instead an image identical to the one given as input (I even
>> checked subtracting the two images with vtkImageMathematics and after the
>> operation there's really nothing left!).
>> I don't understand if the problem is in the setting of the Erode and
>> Dilate
>> values and in the kernel size or maybe in the function of the filter
>> itself,
>> i.e. I expect that the output image has something less compared to the
>> original one after erosion and dilatation (what has been eroded "to the
>> ground" canot be dilated back - is this correct?)
>>
>> Thank you in advance
>> Sorry for the bad english
>>
>> Elena
>>
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