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

[Roger Bramon Feixas]

Hi Luis,

Yes, it's another issue. It's a problem of itkImageFileReader instead of
itkImageSeriesReader.

Let me know if it's not so well explained.

Thanks,

Roger

On Mon, Apr 11, 2011 at 12:45 AM, Luis Ibanez <luis.ibanez at kitware.com>wrote:

> Hi Roger,
>
> It this different from what this patch was fixing ?:
>
> http://review.source.kitware.com/#change,1248
>
> Please let us know,
>
>
>     Thanks
>
>
>           Luis
>
>
> ------------------------------------------
> 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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