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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Thanks Bradley. That sounds a bit beyond my C++ competence level. I'll go the page-splitting route.<br>
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Cheers<br>
Gib<br>
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<div style="direction: ltr;" id="divRpF324668"><font color="#000000" size="2" face="Tahoma"><b>From:</b> Bradley Lowekamp [blowekamp@mail.nih.gov]<br>
<b>Sent:</b> Wednesday, 3 February 2016 3:30 a.m.<br>
<b>To:</b> Gib Bogle<br>
<b>Cc:</b> insight-users<br>
<b>Subject:</b> Re: [ITK] [ITK-users] Read a frame from a 3D image<br>
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<div>Gib,
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<div class="">Currently the TIFFIO does not support streamed reading. Being able to just read a page is a straight forward first step. In fact when I refactored it I made sure it was clear how this could be done in the future [1].</div>
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<div class="">The correct way to do it would be to upgrade TIFFImageIO with this feature. This would involve changing the parent class to StreamingImageIOBase, then overloading methods to disable streamed writing, and overloading the method ( GenerateStreamableReadRegionFromRequestedRegion
) to enable stream read such that the RequestedRegion is expanded to the whole slice, and verifying all the TIFF fields are valid for this operations.</div>
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<div class="">The tricky part would be to adapt existing tests, and test the new functionality.</div>
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<div class="">After that, the streaming would happen seamlessly with the ITK pipeline, giving there are stream compatible filters and all the features are configured correctly.</div>
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<div class="">Alternatively, there are utilities to split the pages of the TIFF in to separate files.</div>
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<div class="">HTH,</div>
<div class="">Brad</div>
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<div class="">On Feb 2, 2016, at 12:25 AM, Gib Bogle <<a href="mailto:g.bogle@auckland.ac.nz" class="" target="_blank">g.bogle@auckland.ac.nz</a>> wrote:</div>
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We want to work with a 3D TIFF that is much too big to fit in memory. It would be sufficient to be able to specify a 2D frame and read that. How can this be done?<br class="">
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Thanks<br class="">
Gib<br class="">
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