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

[Kabelitz, Gordian]

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