[Insight-developers] ImageFileReader/Writer read progress

[Bradley Lowekamp]

Hello,

Setting ImageFileWriter::NumberOfStreamDivisions will change the way  
the pipeline executes. This may effect the results or functionality of  
some filters. So if streaming the pipeline is not desired, call  
UpdateLargestPossibleRegion before the writer. Also only MetaImage  
files support this streaming.

The ImageFileReader does not even appear to sent the start to end  
events. It should be able to at least do that.

If you want true progress from the reader, you could place a  
StreamingImageFilter after it. Set the NumberOfStreamDivisions to an  
appropriate number, trading off number of updates and performance. If  
the ImageIO supports streaming then the progress of the  
StreamingImageFilter will reflect the progress of the reader.

Hope this helps.

Brad

On May 19, 2009, at 5:33 AM, Iván Macía wrote:

> Dear all,
>
> It seems like itk::ImageFileReader does not report any  
> ProgressEvent. On the other hand, ImageFileWriter does seem to  
> update progress for each stream division when  
> NumberOfStreamDivisions is greater than one.
>
> Are there any plans to implement this functionality? It seems like  
> the main problem is that, in that case, each ImageIO should report  
> its own progress to inform the ImageFileReader if im not wrong.
>
> In general, these operations don’t take too much time but there are  
> cases in which it takes considerable time and I would like to inform  
> users of my application about the progress of the operation, for  
> example when the file is being read directly from another place the  
> network.
>
> Thanks in advance
>
> Ivan
>
> -- 
> Iván Macía Oliver
> Investigador / Ikertzailea / Researcher
> Departamento de Aplicaciones Biomédicas - Aplikazio Biomedikoaren  
> Alorra - Biomedical Applications
> VICOMTech - Visual Interaction and Communication Technologies Center
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> E-20009 Donostia - San Sebastián, Spain
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> Fax: +[34] 943 30 93 93
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>
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>
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========================================================
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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