Re: [Gimias-developers] the .png image from a Data Entity

Xavier Planes Fri, 10 Feb 2012 06:06:53 -0800

Hi Miriam,


                Sorry for the late answer. I forgot your email

 

                What you are trying to do is very interesting!!! We already
have a thumbnail viewer widget that allows to visualize snapshots. There are
several medical imaging software that uses snapshots to easily identify the
currently loaded images and allow the user to select the data using
snapshots instead of names in the data tree. One of this software is Osirix:
http://www.osirix-viewer.com/screenshots/Picture1.png. We would like to add
this feature in GIMIAS.

 

                What the other software does is to use a single 2D DICOM
image, and use it as snapshot. This feature is easy to develop in GIMIAS,
adding the 2D image in the MetaData of the DataEntity and retrieve it when
needed. However, this approach only works for DICOM images and not for other
types of data.

 

                If you want to visualize a snapshot for all types of data,
we need to take another approach. I propose you to take the snapshot from a
rendering window, using the code you provided. For example, there could be a
button that allows the user to take a snapshot of the current 3D view and
save it as a snapshot. You can store the 2D image using the MetaData.  When
the data is stored into disk, you can store the snapshot together and load
it again when the data is loaded again. So the snapshot only needs to be
created once.

 

                Let me know if this can help you.

 

Best,

Xavi

 

 

From: Ana Maria Quintero Padron [mailto:[email protected]] 
Sent: viernes, 03 de febrero de 2012 11:56
To: [email protected]
Subject: [Gimias-developers] the .png image from a Data Entity

 

Hello everyone,

 

I'm writing you this email because we need to get the .png image from a Data
Entity.

 

We browse through the data tree like this:

 

      Core::DataEntity::Pointer dataEntity1;

      Core::DataEntityList::Pointer dataEntityList =
GetListBrowser()->GetDataEntityList();

      Core::DataEntityList::iterator it = dataEntityList->Begin();

      Core::DataEntityHelper helper;

 

      for ( int i=0; it != dataEntityList->End(); ++it,i++) 

      {

            dataEntity1 = dataEntityList->Get(it);

                  ()

}

 

We need to get a file with the .png image from each dataEntity. I have tried
to find an example in the existing source code, I have found the following
lines after:

 

vtkRenderer* vtkrenderer;

      wxColour paleWhite(241,244,250);

      vtkrenderer = Get3D()->GetRenderer()->GetVtkRenderer();

      vtkrenderer->SetBackground(1,1,1);

      vtkRenderLargeImage* renderLarge = vtkRenderLargeImage::New();

      renderLarge->SetInput(vtkrenderer);

      vtkPNGWriter* writer=vtkPNGWriter::New();

      writer->SetInputConnection(renderLarge->GetOutputPort());

      writer->SetFileName(imageName.c_str()) ;

      writer->Write();

      vtkrenderer->SetBackground(0,0,0);

 

Which is perfect for saving image of the current view, but the image has to
be already loaded in the working area, and we need to get the image .png
from the data entity, maybe going through vtkSmartPointer< vtkImageData >
vtkImage; but I do not know how I could do this.

 

 

Do you have any idea to solve this? I would appreciate your help.

Thank you very much in advance.

Best regards,

 

Miriam Quintero Padrón

 

 

 

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Re: [Gimias-developers] the .png image from a Data Entity

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