[Insight-developers] Streaming with ImageWriter and IORegion

[Stephen Aylward]

Great idea!

Tell me where and when and I'll be there.

Might be interesting to start with a discussion on how the current process
is failing / not meeting needs.

s

On Mon, Dec 29, 2008 at 12:24 PM, Luis Ibanez <luis.ibanez at kitware.com>wrote:

>
> 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
>>
>


-- 
Stephen R. Aylward, Ph.D.
Chief Medical Scientist
Kitware, Inc. - North Carolina Office
http://www.kitware.com
(518) 371-3971 x300
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