[Insight-users] Problem of ImageToVTKImageFilter, when displaying 2 images

[Markova Aneta]

Hi,

I am also using ImageToVTKImageFilter to visualize 2 images. As you did
I have created 2 different viewers and 2 different interactors. But I
faced the same problem. Loading the first image is fine, but after I
load the second image, the first image also becomes the second image. 

So the problem to that is not in the visualization routine but it is due
to the fact the input to the 2 viewers is the output of the same
filter(for example: resampler->GetOutput()). So you have 2 solutions: 
1. use 2 resampler filters
2. save the 2 images and then read the files and visualize it using 2
viewers and interactors. 


Hope that help,
Aneta


-----Original Message-----
From: insight-users-bounces+amarkova=etro.vub.ac.be at itk.org
[mailto:insight-users-bounces+amarkova=etro.vub.ac.be at itk.org] On Behalf
Of ask ITK
Sent: Wednesday, January 25, 2006 7:58 PM
To: Patrick Cheng
Cc: insight-users at itk.org
Subject: Re: [Insight-users] Problem of ImageToVTKImageFilter,when
displaying 2 images

Sorry...it doesn't work...
I am trying is that related to the interactor....

2006/1/26, Patrick Cheng <cheng at isis.georgetown.edu>:
>
>
> ask ITK wrote:
> > Thanks a lot for the suggestion...
> > but the problem seems to exist...but in other form.....
> > Now half of the first image is destroyed after loading the second
image....
> >
> > Error message now becomes:
> > ERROR: In D:\Research\VTK\src\Imaging\vtkImageImport.cxx, line 303
> > vtkImageImport (020D50E0): Unknown exception.
> >
> > ERROR: In D:\Research\VTK\src\Imaging\vtkImageImport.cxx, line 324
> > vtkImageImport (020D50E0): Unknown exception.
> >
> > I change my code like this....
> > =================================================
> > void ApplicationCore::callViewer(ImagePtr image, int choice)
> > {
> >       m_ImageViewer[choice]->SetupInteractor(
m_renderWindowInteractor[choice]);
> >
> >       // new the connector every time
> >       itkvtkConnectorPtr itkvtkconnector =
itkvtkConnectorType::New() ;
> >       itkvtkconnector->SetInput( image );
>         itkvtkconnector->Update()  //try add this line, see if it
helps.
> >       m_ImageViewer[choice]->SetInput( itkvtkconnector->GetOutput()
);
> >
> >
m_ImageViewer[choice]->SetSize(image->GetLargestPossibleRegion().GetSize
()[0],image->GetLargestPossibleRegion().GetSize()[1]);
> >       m_ImageViewer[choice]->Render();
> >       m_ImageViewer[choice]->SetColorWindow( 255);
> >       m_ImageViewer[choice]->SetColorLevel( 128);
> > //    m_renderWindowInteractor[choice]->Start();
> > }
> >
> > ==================================================
> >
> >
> >
> >
> > 2006/1/26, Patrick Cheng <cheng at isis.georgetown.edu>:
> >> Hi,
> >>
> >> This is a long existing problem. Trying to figure out why too.
> >>
> >> A quick and dirty fix is to instantiate a new
itkImageToVTKImageFilter
> >> every time you read a new image.
> >>
> >> Patrick
> >>
> >>
> >>
> >> ask ITK wrote:
> >>> Problem occurs when I want to use itkImageToVTKImageFilter to
display
> >>> 2 different images.
> >>>
> >>> I want to display to different image with the VTK viewer..
> >>> of coz I think it requires 2 different viewers and 2 different
interactors.
> >>> So I created 2 for both of them.
> >>>
> >>> Loading the first image is fine, but after I load teh second
image,
> >>> the first image also become the second image!
> >>> I don't know how to solve this problem...so please help...
> >>>
> >>> following error is displayed:
> >>>
> >>> ERROR: In
D:\Research\VTK\src\Filtering\vtkStreamingDemandDrivenPipeline.cxx,
> >>> line 643
> >>> vtkImageImportExecutive (020D8F78): The update extent specified in
the
> >>> information for output port 0 on algorithm
vtkImageImport(020D8AD0) is
> >>> 0 142 0 167 0 0, which is outside the whole extent 0 141 0 166 0
0.
> >>>
> >>> I attached my code below, very short, can I can run the program
> >>> smoothly except the stated error. Please help, thanks!
> >>> =======================================================
> >>>
> >>> void ApplicationCore::callViewer(ImagePtr image, int choice)
> >>> {
> >>>       m_itkvtkconnector[choice]->SetInput( image );
> >>>
> >>>       m_ImageViewer[choice]->SetupInteractor(
m_renderWindowInteractor[choice]);
> >>>       m_ImageViewer[choice]->SetInput(
m_itkvtkconnector[choice]->GetOutput() );
> >>>
m_ImageViewer[choice]->SetSize(image->GetLargestPossibleRegion().GetSize
()[0],image->GetLargestPossibleRegion().GetSize()[1]);
> >>>       m_ImageViewer[choice]->Render();
> >>>       m_ImageViewer[choice]->SetColorWindow( 255);
> >>>       m_ImageViewer[choice]->SetColorLevel( 128);
> >>> //    m_renderWindowInteractor[choice]->Start();
> >>> }
> >>> =======================================================
> >>> _______________________________________________
> >>> Insight-users mailing list
> >>> Insight-users at itk.org
> >>> http://www.itk.org/mailman/listinfo/insight-users
> >>>
> >>>
> >
> >
>
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