convert jpg to dicom c++

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J. Riesmeier · #16 Post by **J. Riesmeier** » Mon, 2012-02-27, 17:04

I also create a JPEG baseline compressed DICOM image (with YBR_FULL_422) using img2dcm and opened it with the synedra viewer: The result was as expected.

Are you sure that your input JPEG image is correct? Could you send that particular image to us by email (dicom/at/offis/dot/de)?

MuhammadHemdan · #17 Post by **MuhammadHemdan** » Mon, 2012-02-27, 17:48

J. Riesmeier wrote:I also create a JPEG baseline compressed DICOM image (with YBR_FULL_422) using img2dcm and opened it with the synedra viewer: The result was as expected.

Are you sure that your input JPEG image is correct? Could you send that particular image to us by email (dicom/at/offis/dot/de)?

You are right. I did this test and works well. I will see how my jpeg is saved. Thank you for your interesting. Thanks alot.

MuhammadHemdan · #18 Post by **MuhammadHemdan** » Mon, 2012-02-27, 17:58

MuhammadHemdan wrote:
J. Riesmeier wrote:I also create a JPEG baseline compressed DICOM image (with YBR_FULL_422) using img2dcm and opened it with the synedra viewer: The result was as expected.

Are you sure that your input JPEG image is correct? Could you send that particular image to us by email (dicom/at/offis/dot/de)?
You are right. I did this test and works well. I will see how my jpeg is saved. Thank you for your interesting. Thanks alot.

How I know if the jpeg is correct?

MuhammadHemdan · #19 Post by **MuhammadHemdan** » Tue, 2012-02-28, 12:13

MuhammadHemdan wrote:
MuhammadHemdan wrote:
J. Riesmeier wrote:I also create a JPEG baseline compressed DICOM image (with YBR_FULL_422) using img2dcm and opened it with the synedra viewer: The result was as expected.

Are you sure that your input JPEG image is correct? Could you send that particular image to us by email (dicom/at/offis/dot/de)?
You are right. I did this test and works well. I will see how my jpeg is saved. Thank you for your interesting. Thanks alot.
How I know if the jpeg is correct?

Sorry for repeating the question, But how can i know if the jpeg image is correct or not? I can't send the image because of Confidentiality.

J. Riesmeier · #20 Post by **J. Riesmeier** » Tue, 2012-02-28, 12:24

Does the JPEG image show up correctly in a conventional image viewer?

What do you mean by "You are right. I did this test and works well." in your previous posting?

MuhammadHemdan · #21 Post by **MuhammadHemdan** » Tue, 2012-02-28, 12:35

J. Riesmeier wrote:Does the JPEG image show up correctly in a conventional image viewer?

What do you mean by "You are right. I did this test and works well." in your previous posting?

Yes the JPEG image show up correctly in a conventional image viewer.

My application saves image as jpeg using jpeglib. When I convert the jpeg image out from my application to dcm the problem happens.
But if I take print screen and save the image as jpeg using Paint tool then convert it to dcm there is no any problem.

J. Riesmeier · #22 Post by **J. Riesmeier** » Tue, 2012-02-28, 12:37

Maybe, you could send another problematical JPEG image to us, i.e. one without confidential information.

MuhammadHemdan · #23 Post by **MuhammadHemdan** » Tue, 2012-02-28, 13:02

J. Riesmeier wrote:Maybe, you could send another problematical JPEG image to us, i.e. one without confidential information.

I sent two images by e-mail. one jpeg out from my application and the other the dicom image.

omarelgazzar · #24 Post by **omarelgazzar** » Tue, 2012-02-28, 13:42

Hello,
I tried to view the images with Sante DICOM Viewer the result was fine and as expected. I compared your output DICOM image with the output of the img2dcm and they are using the same photometric interpretation color model YBR_FULL_422. So, it seems the problem is in the Synedra viewer which does not support non-RGB color model. Btw, when I dumped the image on Synedra viewer using their own dump viewer, I found the Photometric interpretation RGB which is probably the reason for the strange behaviour of the image viewing after converting from YBR_FULL_422 -> RGB. So, the output of img2dcm should be fine and can only work with viewers such as Sante which support YBR_FULL_422 color model.

MuhammadHemdan · #25 Post by **MuhammadHemdan** » Tue, 2012-02-28, 14:10

omarelgazzar wrote:Hello,
I tried to view the images with Sante DICOM Viewer the result was fine and as expected. I compared your output DICOM image with the output of the img2dcm and they are using the same photometric interpretation color model YBR_FULL_422. So, it seems the problem is in the Synedra viewer which does not support non-RGB color model. Btw, when I dumped the image on Synedra viewer using their own dump viewer, I found the Photometric interpretation RGB which is probably the reason for the strange behaviour of the image viewing after converting from YBR_FULL_422 -> RGB. So, the output of img2dcm should be fine and can only work with viewers such as Sante which support YBR_FULL_422 color model.

Thank you so much for your interesting. I spent alot of time in this problem. Everything is well now.

J. Riesmeier · #26 Post by **J. Riesmeier** » Tue, 2012-02-28, 14:33

omarelgazzar wrote:So, it seems the problem is in the Synedra viewer which does not support non-RGB color model.

No, the Synedra viewer can display such images correctly, but for some reason not the one "MuhammadHemdan" has provided by email. This could also be a bug in img2dcm.

J. Riesmeier · #27 Post by **J. Riesmeier** » Tue, 2012-02-28, 15:07

To me it seems that the input JPEG image uses RGB color space instead of YCbCr. When I decompress the JPEG-compressed DICOM image image with dcmdjpeg --conv-guess, the output looks ok.

Btw, the Synedra viewer is based on DCMTK ...

MuhammadHemdan · #28 Post by **MuhammadHemdan** » Tue, 2012-02-28, 16:04

J. Riesmeier wrote:To me it seems that the input JPEG image uses RGB color space instead of YCbCr. When I decompress the JPEG-compressed DICOM image image with dcmdjpeg --conv-guess, the output looks ok.

Btw, the Synedra viewer is based on DCMTK ...

How can i do this in my application using c++? is this by DJDecoderRegistration?

MuhammadHemdan · #29 Post by **MuhammadHemdan** » Tue, 2012-02-28, 16:44

MuhammadHemdan wrote:
J. Riesmeier wrote:To me it seems that the input JPEG image uses RGB color space instead of YCbCr. When I decompress the JPEG-compressed DICOM image image with dcmdjpeg --conv-guess, the output looks ok.

Btw, the Synedra viewer is based on DCMTK ...

How can i do this in my application using c++? is this by DJDecoderRegistration?

I write the following code but the generated dicom image can't be viewed.
What is the problem? Are the parameteres of the function correct?

DJDecoderRegistration::registerCodecs(EDC_guess); // register JPEG codecs
if (dcmff.loadFile(pDICOM).good())
{
// decompress data set if compressed
dataset->chooseRepresentation(EXS_LittleEndianExplicit, NULL);

// check if everything went well
if (dataset->canWriteXfer(EXS_LittleEndianExplicit))
{
result = dcmff.saveFile(pDICOM, EXS_LittleEndianExplicit);
}
}
DJDecoderRegistration::cleanup(); // deregister JPEG codecs

J. Riesmeier · #30 Post by **J. Riesmeier** » Tue, 2012-02-28, 18:03

Where do you define "dataset"? Its value should be the pointer returned by dcmff.getDataset().

Btw, the color space conversion flags are also available to dcmj2pnm ...

Code: Select all

color space conversion (compressed images only):

  +cp   --conv-photometric
          convert if YCbCr photometric interpretation (default)

  +cl   --conv-lossy
          convert YCbCr to RGB if lossy JPEG

  +cg   --conv-guess
          convert to RGB if YCbCr is guessed by library

  +cgl  --conv-guess-lossy
          convert to RGB if lossy JPEG and YCbCr is
          guessed by the underlying JPEG library

  +ca   --conv-always
          always convert YCbCr to RGB

  +cn   --conv-never
          never convert color space

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