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GenFakeImage.cxx

/*=========================================================================

  Program: GDCM (Grassroots DICOM). A DICOM library
  Module:  $URL$

  Copyright (c) 2006-2010 Mathieu Malaterre
  All rights reserved.
  See Copyright.txt or http://gdcm.sourceforge.net/Copyright.html for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#include "gdcmImage.h"
#include "gdcmImageWriter.h"
#include "gdcmFileDerivation.h"
#include "gdcmUIDGenerator.h"
//#include "gdcmImageChangePhotometricInterpretation.h"

/*
 * This example shows two things:
 * 1. How to create an image ex-nihilo
 * 2. How to use the gdcm.FileDerivation filter. This filter is meant to create "DERIVED" image
 * object. FileDerivation has a simple API where you can reference *all* the input image that have been
 * used to generate the image. The API also allows user to specify the purpose of reference (see CID 7202,
 * PS 3.16 - 2008), and the image derivation type (CID 7203, PS 3.16 - 2008).
 */
int main(int, char *[])
{
  // Step 1: Fake Image
  gdcm::SmartPointer<gdcm::Image> im = new gdcm::Image;

  char * buffer = new char[ 256 * 256 * 3];
  char * p = buffer;
  int b = 128;
  int ybr[3];
  int ybr2[3];
  int rgb[3];

  for(int r = 0; r < 256; ++r)
    for(int g = 0; g < 256; ++g)
      //for(int b = 0; b < 256; ++b)
      {
      rgb[0] = r;
      rgb[1] = g;
      rgb[1] = 128;
      rgb[2] = b;
      ybr[0] = r;
      ybr[1] = g;
      ybr[1] = 128;
      ybr[2] = b;

      ybr2[0] = r;
      ybr2[1] = g;
      ybr2[1] = 128;
      ybr2[2] = b;
      //gdcm::ImageChangePhotometricInterpretation::YBR2RGB(rgb, ybr);
      //gdcm::ImageChangePhotometricInterpretation::RGB2YBR(ybr2, rgb);
      *p++ = ybr2[0];
      *p++ = ybr2[1];
      *p++ = ybr2[2];
      }

  im->SetNumberOfDimensions( 2 );
  im->SetDimension(0, 256 );
  im->SetDimension(1, 256 );

  im->GetPixelFormat().SetSamplesPerPixel(3);
  //im->SetPhotometricInterpretation( gdcm::PhotometricInterpretation::RGB );
  im->SetPhotometricInterpretation( gdcm::PhotometricInterpretation::YBR_FULL );

  unsigned long l = im->GetBufferLength();
  if( l != 256 * 256 * 3 )
    {
    return 1;
    }
  gdcm::DataElement pixeldata( gdcm::Tag(0x7fe0,0x0010) );
  pixeldata.SetByteValue( buffer, l );
  delete[] buffer;
  im->SetDataElement( pixeldata );

  gdcm::UIDGenerator uid; // helper for uid generation

  gdcm::SmartPointer<gdcm::File> file = new gdcm::File; // empty file

  // Step 2: DERIVED object
  gdcm::FileDerivation fd;
  // For the pupose of this execise we will pretend that this image is referencing
  // two source image (we need to generate fake UID for that).
  const char ReferencedSOPClassUID[] = "1.2.840.10008.5.1.4.1.1.7"; // Secondary Capture
  fd.AddReference( ReferencedSOPClassUID, uid.Generate() );
  fd.AddReference( ReferencedSOPClassUID, uid.Generate() );

  // Again for the purpose of the exercise we will pretend that the image is a
  // multiplanar reformat (MPR):
  // CID 7202 Source Image Purposes of Reference
  // {"DCM",121322,"Source image for image processing operation"},
  fd.SetPurposeOfReferenceCodeSequenceCodeValue( 121322 );
  // CID 7203 Image Derivation
  // { "DCM",113072,"Multiplanar reformatting" },
  fd.SetDerivationCodeSequenceCodeValue( 113072 );
  fd.SetFile( *file );
  // If all Code Value are ok the filter will execute properly
  if( !fd.Derive() )
    {
    std::cerr << "Sorry could not derive using input info" << std::endl;
    return 1;
    }

  // We pass both :
  // 1. the fake generated image
  // 2. the 'DERIVED' dataset object
  // to the writer.
  gdcm::ImageWriter w;
  w.SetImage( *im );
  w.SetFile( fd.GetFile() );

  // Set the filename:
  w.SetFileName( "ybr2.dcm" );
  if( !w.Write() )
    {
    return 1;
    }

  return 0;
}

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