[vtkusers] vtkImageReader

[Oliver Fleig]

Naveen Kumar Polapally wrote:

> I have a task where i should be able to read any part of the volume, i see
> that using  vtkImageReader i have to read slice by slice.
> 
> suppose i have 0 511 0 511 1 100, i want to be able to read
>         0 255 0 255 1 50.
> with vtkImageReader  even if i use
>         setDataVOI(0,255,0,255,1,50) i still have to give the whole extent
> setDataExtent(0,511,0,511,1,100).
> 
> Is the any other reader which can read only a subvolume, with out any
> restrictions.
 
  unsigned char * volume_raw = new unsigned char[xdim*ydim*zdim];
  volfile.read(volume_raw,xdim*ydim*zdim*sizeof(unsigned char)) ;
 
  
  vtkImageImport * vol = vtkImageImport :: New() ;
  vol-> SetDataScalarTypeToUnsignedChar ();
  vol->SetDataExtent(0,xdim-1,0,ydim-1,0,zdim-1);
  vol->CopyImportVoidPointer ( (void*)  volume_raw, 
                   xdim*ydim*zdim*sizeof(unsigned char) ) ;
  delete[] volume_raw;

To read a sub volume used the appropriate offsets!!
I think there is also a version that does not copy over. 

Cheers

Oliver


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mailto:Oliver.Fleig at univ-rennes1.fr