[Insight-developers] Trying to minimize the memory needed by itkImageFileReader

[Luis Ibanez]

Hi Roger,

It this different from what this patch was fixing ?:

http://review.source.kitware.com/#change,1248

Please let us know,


     Thanks


           Luis


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On Tue, Apr 5, 2011 at 3:32 AM, Roger Bramon Feixas
<rogerbramon at gmail.com> wrote:
> Hi,
> I'm trying to minimize the memory needed at the same time to read a DICOM
> file using itkImageFileReader. Basically, the problem is related with the
> pixel type chosen. I always use "signed short" because I actually work with
> CT and MR but sometimes GDCMImageIO chooses another pixel type and a
> conversion has to be done. It means that when GDCMImageIO is reading, 3
> buffers are allocated:
> - Buffer allocated by this->AllocateOutputs(); in
> ImageFileReader::GenerateData() (line 370 of itkImageFileReader.txx)
> - Buffer allocated by loadBuffer = new char[ sizeOfActualIORegion ]; in
> ImageFileReader::GenerateData() (line 414 of itkImageFileReader.txx)
> - Buffer allocated by reader.Read() in GDCMImageIO::Read of
> itkGDCMImageIO.cxx
> but not all of them are used at the same time. I mean, the memory needed to
> the outputs is allocated at the top of ImageFileReader::GenerateData()
> when this->AllocateOutputs() is called. However, if a conversion has to be
> done, this buffer is used after reading since the buffer used
> is loadBuffer.
> Could be possible to allocate the output memory after the reading (if a
> conversion is needed)? It would allow us to have 2 buffers instead of 3 at
> the same time and it would be great to minimize memory problems reading huge
> multiframes DICOM files which are really common.
> I hope you understand my problem.
> Thanks,
> Roger
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