[Insight-developers] Streaming with ImageWriter and IORegion

[Luis Ibanez]

Stephen,

Should we address this during the upcoming NAMIC developers meeting  ?
(Jan 4th-8th) is not that far.

The implementation of Streaming for Reading was done in one of these
meetings. It was a lot easier by the developers of several ImageIO
classes in the room.

Heavy enforcers of backward-compatibility may also be attending this
meeting... so all fronts will be cared for.  :-)


    My 2 cents suggestion,


       Luis


------------------------
Stephen Aylward wrote:
> Hi,
> 
> We use metaIO streaming reading and writing fairly heavily in several 
> apps.   Please let me know if you find problems or if you need any 
> help.   Several people have been adding features in the past year or so, 
> and I fear a bit of feature creap and bad coding might have arisen.   
> Might be time for some house cleaning.
> 
> My recent changes were to fix memory leaks, to improve reporting 
> regarding when streaming is or is not supported, and to fix a bug when 
> attempting to read a stream equal to the size of the entire image.
> 
> Also, note that changes to MetaIO cannot be committed directly to 
> Insight.   It is a locked directory in the CVS repository because MetaIO 
> in ITK and VTK share the same code which exists in a public svn repository:
> https://www.kitware.com:8443/svn/KWPublic/trunk/MetaIO
> 
> Changes made to the svn repository are automatically (and nearly 
> instantly) distributed to ITK and VTK.   It is a wonderfully unique 
> opportunity to annoy a huge number of open-source developers in a wide 
> range of fields with a single check-in :)
> 
> Stephen
> 
> On Mon, Dec 29, 2008 at 11:43 AM, Bradley Lowekamp 
> <blowekamp at mail.nih.gov <mailto:blowekamp at mail.nih.gov>> wrote:
> 
>     Hello,
> 
>     I submitted MetaImageIO  as bug #8333. The streaming pipeline is
>     working just fine; MetaIO is just failing to read it under these
>     conditions. I am going to commit the compare for
>     itkMetaImageStreamingWriterIOTest2 to verify that is just not a
>     weird mac issue. Then I will try to track it down if it's a cross
>     platform issue. I am also just discovering some problems with mhd vs
>     mha files too. I'm going to have to look at the interaction of a few
>     things here... Not sure what's going on...
>     These problems are orthogonal to the posted enhancement
>     though. Please let me know what else you need for this enhancement.
> 
>     Brad
> 
>     On Dec 27, 2008, at 4:51 PM, Luis Ibanez wrote:
> 
>>     Bradley Lowekamp wrote:
>>
>>>        Thirdly, before I left work for the holiday, I had an idea
>>>     what the  cause of itkMetaImageStreamingWriterIOTest2 not
>>>     producing the correct  results. I think that MetaImageIO,
>>>     streaming functionality does not  work with non-square voxels.
>>>     But I need to look into this further to  be certain. I was
>>>     planning on doing this on Monday.
>>
>>>     Brad
>>
>>     -------------------------
>>
>>     Hi Brad,
>>
>>     I don't quite see why pixel spacing would interfere in any way with
>>     the process of streaming the pixel data.
>>
>>     As far of the streaming process is concerned, the pixel data is simply
>>     an array of bytes...
>>
>>     It is more likely that other factors may be involved in this problem.
>>
>>
>>       Luis
>>
>>
> 
>     ========================================================
> 
>     Bradley Lowekamp  
> 
>     Lockheed Martin Contractor for
> 
>     Office of High Performance Computing and Communications
> 
>     National Library of Medicine 
> 
>     blowekamp at mail.nih.gov <mailto:blowekamp at mail.nih.gov>
> 
> 
> 
> 
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> 
> 
> 
> -- 
> Stephen R. Aylward, Ph.D.
> Chief Medical Scientist
> Kitware, Inc. - North Carolina Office
> http://www.kitware.com
> (518) 371-3971 x300