/*!

\page mod_dcmjpeg dcmjpeg: a compression/decompression library and utility apps

This module contains classes that convert between uncompressed and JPEG
compressed representations (transfer syntaxes) of a DICOM image object.
Both lossless and lossy JPEG processes are supported. This module implements
a family of codecs that are derived from class DcmCodec and can be registered
in the codec list maintained in module dcmdata.

The main interface classes are:
\li \b DJEncoderRegistration
\li \b DJDecoderRegistration
\li \b DJCodecEncoder
\li \b DJCodecDecoder

\section Tools

This module contains the following command line tools:
\li \ref dcmcjpeg
\li \ref dcmdjpeg
\li \ref dcmj2pnm
\li \ref dcmmkdir

\section Examples

The following example shows how to compress a DICOM image file with lossless JPEG:

\code
DJEncoderRegistration::registerCodecs(); // register JPEG codecs
DcmFileFormat fileformat;
if (fileformat.loadFile("test.dcm").good())
{
  DcmDataset *dataset = fileformat.getDataset();
  DcmItem *metaInfo = fileformat.getMetaInfo();
  DJ_RPLossless params; // codec parameters, we use the defaults

  // this causes the lossless JPEG version of the dataset to be created
  dataset->chooseRepresentation(EXS_JPEGProcess14SV1, &params);

  // check if everything went well
  if (dataset->canWriteXfer(EXS_JPEGProcess14SV1))
  {
    // force the meta-header UIDs to be re-generated when storing the file
    // since the UIDs in the data set may have changed
    delete metaInfo->remove(DCM_MediaStorageSOPClassUID);
    delete metaInfo->remove(DCM_MediaStorageSOPInstanceUID);

    // store in lossless JPEG format
    fileformat.saveFile("test_jpeg.dcm", EXS_JPEGProcess14SV1);
  }
}
DJEncoderRegistration::cleanup(); // deregister JPEG codecs
\endcode

The following example shows how to decompress a JPEG-compressed DICOM image file:

\code
DJDecoderRegistration::registerCodecs(); // register JPEG codecs
DcmFileFormat fileformat;
if (fileformat.loadFile("test_jpeg.dcm").good())
{
  DcmDataset *dataset = fileformat.getDataset();

  // decompress data set if compressed
  dataset->chooseRepresentation(EXS_LittleEndianExplicit, NULL);

  // check if everything went well
  if (dataset->canWriteXfer(EXS_LittleEndianExplicit))
  {
    fileformat.saveFile("test_decompressed.dcm", EXS_LittleEndianExplicit);
  }
}
DJDecoderRegistration::cleanup(); // deregister JPEG codecs
\endcode

*/