[Insight-users] Writing and Streaming

[Bradley Lowekamp]

Greetings all!

I am trying to stream my data set. I see that MetaIO supports  
streaming for reading and writing. But I don't seem to be able to use  
it for writing. I am trying to stream my 13GB data set from a  
ImageFileReader through a ShrinkImageFilter then write is out with a  
ImageFileWriter. If I replace the writer with a StreamingImageFilter  
it works great, the reader streams and everything.

To get the writer to stream (or not) I am doing this:

  shrinker->UpdateOutputInformation();
  RGBVolumeType::RegionType outputRegion = shrinker->GetOutput()- 
 >GetLargestPossibleRegion();

   itk::ImageRegionSplitter<3>::Pointer splitter =  
itk::ImageRegionSplitter<3>::New();
   numberOfSplits = splitter->GetNumberOfSplits(outputRegion,  
numberOfSplits);

   writer->SetFileName( outputFilePN.GetPathName());
   writer->SetInput(shrinker->GetOutput());
   for(unsigned int i = 0; i < numberOfSplits; ++i) {
       RGBVolumeType::RegionType streamRegion = splitter->GetSplit(i,  
numberOfSplits, outputRegion);
       ioRegion = streamRegion; // sudo code

       writer->SetIORegion(ioRegion);
       writer->Update();
     }


Is this the correct approach? Does anyone have an example of streaming  
writing?

I think I am going to dig though the ImageFileWriter now to see what  
are the updates going on in the pipeline execution. I still a bit  
fuzzy on these details, so  may miss something.

Please let me know of any suggestions.

Thanks,
Brad

========================================================
Bradley Lowekamp
Lockheed Martin Contractor for
Office of High Performance Computing and Communications
National Library of Medicine
blowekamp at mail.nih.gov


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