[ITK-users] why can the itkStatisticsImageFilter not stream?

[Bradley Lowekamp]

Hello fellow mailing list member,

Currently in ITK there are two base classes for streaming images in ITK. The ImageToImageFilter provide the framework of streaming one input region to one output region. The other is the StreamingImageFilter which provides the framework to stream multiple image regions and merge them together into a single output image. This StatisticsImageFilter needs a framework which consumes multiple input image regions and reduces the data produced. I happen to have implemented such a framework here [1]. It currently has the LabelStatisticsImageFilter implemented in a streaming fashion.

Let me give it a try and see how quickly I can get the StatisticsImageFilter in this framework. Help writing tests would be appreciated.

Thanks,
Brad


[1] https://github.com/blowekamp/itkStreamingSinc

On Apr 17, 2015, at 5:08 AM, Dr. Roman Grothausmann <grothausmann.roman at mh-hannover.de> wrote:

> Dear mailing list members,
> 
> 
> I'm wondering why the itkStatisticsImageFilter cannot stream?
> Looking into itkStatisticsImageFilter.hxx it requests the whole input in GenerateInputRequestedRegion and EnlargeOutputRequestedRegion but in ThreadedGenerateData only iterates over the outputRegionForThread.
> Where in the code is the whole input image needed as one single block?
> 
> Thanks for any hints
> Roman
> 
> -- 
> Dr. Roman Grothausmann
> 
> Tomographie und Digitale Bildverarbeitung
> Tomography and Digital Image Analysis
> 
> Institut für Funktionelle und Angewandte Anatomie, OE 4120
> Medizinische Hochschule Hannover
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> D-30625 Hannover
> 
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