Problem with storing RAW data with lossless compression

[zelva]

Hello,

I am trying to save RAW image data in new DICOM file. Everything is OK if the transfer syntax is EXS_LittleEndianExplicit (uncompressed data).
But I would like to store data with some lossless compression. I tried it with EXS_JPEGProcess14SV1TransferSyntax, but generated DICOM file is unreadable with DicomWorks viewer (or the image is somehow skewed). Only ezDicom can open it. Is it possible to store RAW image data with some lossless compression at all?

Here is piece of my program. First I store some imortant tags like BitsAllocated,BitsStored,HighBit,PhotometricInterpretation,SamplesPerPixel,Columns,Rows,NumberOfFrames,
PixelRepresentation,PlanarConfiguration,ImagePosition,PixelSpacing and SliceThickness. Then I do following code:

Code: Select all

char uid[100];
dataset->putAndInsertString(DCM_SOPClassUID,UID_SecondaryCaptureImageStorage);    dataset->putAndInsertString(DCM_SOPInstanceUID,dcmGenerateUniqueIdentifier(uid,SITE_INSTANCE_UID_ROOT));
dataset->putAndInsertString(DCM_PatientsName,"Joe");

dataset->putAndInsertUint8Array(DCM_PixelData, (Uint8*)data,length);

DJDecoderRegistration::registerCodecs(EDC_photometricInterpretation,EUC_default,EPC_default,OFFalse);
DJEncoderRegistration::registerCodecs(ECC_lossyYCbCr,EUC_default,OFFalse,OFTrue,0,0,0,OFTrue,ESS_444,OFFalse,OFFalse,0,0,0.0,0.0,0,0,0,0,OFTrue,OFFalse,OFFalse,OFFalse,OFTrue);

DJ_RPLossless params(6,0); // codec parameters, we use the defaults

dataset->chooseRepresentation(EXS_JPEGProcess14SV1TransferSyntax, &params);

if (dataset->canWriteXfer(EXS_JPEGProcess14SV1TransferSyntax))
{
// store in lossless JPEG format
dcmHeader.saveFile(saveName,EXS_JPEGProcess14SV1TransferSyntax,EET_ExplicitLength,EGL_recalcGL,EPD_noChange,0,0,OFFalse);
}

DJDecoderRegistration::cleanup();
DJEncoderRegistration::cleanup();

You can find generated DICOM files here:
(without compression)
http://www.izelva.cz/dicom/1.dcm
(with compression)
http://www.izelva.cz/dicom/2.dcm

Do you have any advices?
Thanks a lot!

Kuba

[Jörg Riesmeier]

I can open and view both images, so everything seems to be ok. Of course, a couple of required attributes are missing for the Secondary Capture IOD.