[vtkusers] How to extract vtkImageData from vtkDICOMImageReader

[Paweł~~Łubniewski]

Dear Xiaofeng,
If you want to break the pipeline, you'd better create a _shallow_, not deep
copy of the output. It prevents from creating a new physical copy of the
image.
Snippet:
//...
dicomReader->Update();
vtkImageData* output = vtkImageData::New();
output->ShallowCopy(dicomReader->GetOutput() );
dicomReader->Delete();
//...

Dear Prashanth,
Functions Register() and Unregister() are intended to object internal use,
if you don't have to, don't use them.

Regards,
Pawel~
_________________
Paweł~~Łubniewski
__________________________________________________________________________


2010/3/21 Prashanth Udupa <prashanth.udupa at gmail.com>

> You could also do this..
>
> vtkDICOMImageReader* reader = vtkDICOMImageReader::New();
> reader->...
> reader->Update();
>
> vtkImageData* image = reader->GetOutput();
> image->Register();
>
> reader->Delete();
>
> This way image will exist even after the reader is deleted...
>
> / Prashanth
>
> 2010/3/21 Xiaofeng Z <xf10036 at hotmail.com>:
> > Thanks for your reply.  I also found out that if I first create a
> > vtkImageData object and pass it into vtkDICOMImageReader for it to use as
> > output, the vtkImageData object will retain itself when
> vtkDICOMImageReader
> > is deleted:
> >
> > vtkImageData* image = vtkImageData::New();
> > reader.SetOutput(image);
> > ...
> >
> > Is this a safe way to do?
> >
> > Thanks!
> >
> > Xiaofeng
> >
> >
> >
> >
> > ________________________________
> > Date: Sun, 21 Mar 2010 13:11:50 +0900
> > Subject: Re: [vtkusers] How to extract vtkImageData from
> vtkDICOMImageReader
> > From: wangjunchen at gmail.com
> > To: xf10036 at hotmail.com; vtkusers at vtk.org
> >
> > because when you delete the reader, the imagedate(reader->GetOutput())
> has a
> > reference count 0 , so it is also recycled.
> > if you want to pertain the output of the reader, you can do either:
> > 1. connect the output to the vtk pipeline
> > or
> > 2.  vtkImageData * img = vtkImageData::New();
> >     img->DeepCopy(reader->GetOutput());
> >     reader->Delete();
> >     // then you can access to the img...
> >
> > 2010/3/21 Xiaofeng Z <xf10036 at hotmail.com>
> >
> > Hello,
> >
> > I use vtkDICOMImageReader to load a CT series:
> >
> > vtkDICOMImageReader* reader = vtkDICOMImageReader::New();
> > reader.SetDirectoryName("...");
> > reader->Update();
> > vtkImageData* image = reader->GetOutput();
> >
> > I was able to load the CT series without issue.  The problem is as soon
> as I
> > call reader::Delete(), the data in "image" appeared to be wiped out.  Is
> > there anyway to retain the vtkImageData object without having to keep the
> > vtkDICOMImageReader object?
> >
> > Thanks!
> >
> > Xiaofeng Zhao
> >
> >
> >
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> --
> Thanks and Warm Regards,
> Prashanth N Udupa
>
> prashanth.udupa at gmail.com
> http://www.prashanthudupa.com
> http://prashanthudupa.livejournal.com/
> _______________________________________________
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>
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