[Insight-users] How to re-use a filter output?

[Luis Ibanez]

Hi Lemeur,

When you create a filter with a mini-pipeline inside
You should use GraftOutput() in order to take the output
image of your mini-pipeline and graft it as the output of
your own filter.


For an example, you may want to look a the files

   Insight/Code/BasicFilter/
    itkSmoothingRecursiveGaussianImageFilter.txx


In your code it will be something like

        this->GraftOutput( M->GetOutput() );

instead of

        this->SetNthOutput( output ).


Regards,


    Luis,


------------------

Lemeur Yann wrote:

> Hi all!
> 
> I'm confronted to a problem with filters derived from itkProcessObject.
> I've made my own filters (3 filters: A, B and C) which use some DataObjects I've also created.
> In order to simplify the use of these filters, I've packed them in one filter called M.
> In the GenerateData() of M, the three filters are executed to produce the output of M (this output is a Tree, a class I've made):
> 
> M::GenerateData()
> {
> 		.....
> 		.....
> 		.....
> 		
> typename TreeType::Pointer output= this->GetOutput();
> 
> A->SetInput(M->GetInput());
> B->SetInput(A->GetOutput());
> C->SetInput(B->GetOutput());
> 
> output=M->GetOutput();
> C->Update();
> 
> this->SetNthOutput(0,output);
> 
> } // end of M::GenerateData()
> 
> In a main file, I've written:
> 
> TreeType::Pointer tree=M->GetOutput();
> M->Update();
> 
> I've seen that the output var is ok after the C->Update() in the M::GenerateData() method. But in my main program, the pointer tree seems to be assigned to an empty Tree.
> 
> I think the problem is that the GetOutput() method return a raw pointer so the output var is not available outside the scope of GenerateData() (it might be deleted somewhere...).
> So I can't produce the output of M!
> 
> Daes anybody know how to link the output of M whith the output of C, without copying the Tree objects (ie without making *output=*(C->GetOutput()) ) ?
> 
> Thanks.    
> 
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