You can do stuff like this, which isn't meant to read the image:
int readImageInfo(std::string filename, itk::ImageIOBase::IOComponentType
*ComponentType, int *dim)
{
itk::ImageIOBase::Pointer imageIO =
itk::ImageIOFactory::CreateImageIO(filename.c_str(),
itk::ImageIOFactory::ReadMode);
if (imageIO.IsNull())
return 0;
imageIO->SetFileName(filename.c_str());
imageIO->ReadImageInformation();
*ComponentType = imageIO->GetComponentType();
*dim = imageIO->GetNumberOfDimensions();
return(1);
}
I think you'll need to look at the streaming examples to extract slices,
and that will probably depend on the reader supporting streaming.
On Tue, Dec 12, 2017 at 2:44 PM, Gib Bogle <g.bo...@auckland.ac.nz> wrote:
> Hello,
>
>
> I am wanting to work with a 50 GB LSM file (3D). The first step is to be
> able to get the image info: width, height and depth. I have code that
> works on a small LSM file
>
>
> im_u16 = reader->GetOutput();
> width = im_u16->GetLargestPossibleRegion().GetSize()[0];
> height = im_u16->GetLargestPossibleRegion().GetSize()[1];
> depth = im_u16->GetLargestPossibleRegion().GetSize()[2];
>
>
> but I see that to do this the whole image must be loaded into memory.
> When I start the program running with the big file I can see that it is
> going to exceed the host machine's 32 GB. Is there a way to get the image
> dimensions without loading the whole image? What I am hoping to do is
> split the file into 2D TIFF files - is there any way to extract a 2D slice
> without reading the whole image? Or will I be forced to run on a machine
> with more than 50 GB of RAM?
>
>
> Thanks in advance for any suggestions.
>
>
> Best regards
>
> Gib
>
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