[ITK-users] Conversion from cv::mat to writable itk::image

[Dženan Zukić]

Hi Gordian,

can you try giving the filename .nrrd or .mha extension instead of .dcm?

Regards,
Dženan

On Fri, Nov 25, 2016 at 10:20 AM, Kabelitz, Gordian <
Gordian.Kabelitz at medma.uni-heidelberg.de> wrote:

> Hello,
>
> i started working on a program that uses ITK in combination with OpenCV.
> At the moment I encounter the problem with the image conversion from
> cv::Mat to itk::image.
> Using OpenCVImageBridge:: ITKImageToCVMat() can convert ITK images to
> cv::Mat and works pretty well. That part is similar to [1].
>
> A problem occurs, when I want to convert the images back to ITK images by
> using OpenCVImageBridge:: CVMatToITKImage ().
> Here is a code snippet (similar to [2]):
> [...]
> cv::Mat outimage = cvImage; // outimage is an image previously converted
> from itk::image to cv::Mat
> typedef itk::OpenCVImageBridge BridgeType;
> CVImageType::Pointer outputImage = BridgeType::CVMatToITKImage<
> CVImageType>(outimage);
>
> typedef itk::CastImageFilter< CVImageType, OutImage > CastFilterType;
> CastFilterType::Pointer caster = CastFilterType::New();
>  caster->SetInput(outputImage);
>
> typedef itk::ImageFileWriter<OutImage> WriterType;
> WriterType::Pointer outputWriter = WriterType::New();
> outputWriter->SetImageIO(gdcmIO);
> outputWriter->SetInput(caster->GetOutput());
> outputWriter->SetFileName(argv[2]);
> try  {
>           outputWriter->Update();
>   }   catch (itk::ExceptionObject err)  {
>           std::cout << "EXCEPTION CAUGHT!" << std::endl;
>           std::cout << err << std::endl;
>           return EXIT_FAILURE;
>   }
>
> It compiles and runs with only the following error:
> Description: itk::ERROR: GDCMImageIO(0000000003B22290): A Floating point
> buffer was passed but the stored pixel type was not specified. This is
> currently not supported.
>
> Is there an option to get a writable image? Did I make an obvious mistake?
> Is there a website to get more examples working for ITK with Opencv?
>
> Thanks in advance,
> Gordian
>
> [1]: https://github.com/InsightSoftwareConsortium/ITK-
> OpenCV-Bridge-Tutorial
> [2]: https://github.com/InsightSoftwareConsortium/ITK-
> OpenCV-Bridge-Tutorial/blob/master/Exercises/ITKOpenCVBridge/exercise2/
> BasicVideoFilteringITKOpenCVBridge.cxx
>
>
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