Hi, Melanie.<div><br></div><div>Use The metaheader format (.mha or mhd) with itkImageFileWriter. They can handle the covariant vector image type. No idea of Nrrd supports covariant vectors</div><div><br></div><div>Regards<br>
<br><div class="gmail_quote">On Thu, Apr 7, 2011 at 5:10 PM, Melanie Uks <span dir="ltr"><<a href="mailto:meluks2010@googlemail.com">meluks2010@googlemail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
I tried to design an example for the GradientRecursiveGaussianImageFilter. Now I have a problem finding a file format for the "CovariantVector"-OutputImage. I tried to use nrrd :<br><br> itk::NrrdImageIO::Pointer io = itk::NrrdImageIO::New();<br>
//io->SetNrrdVectorType( nrrdKindList );<br> io->SetFileType( itk::ImageIOBase::ASCII );<br> <br> //create the reader and writer <br> ReaderType::Pointer reader = ReaderType::New();<br> WriterType::Pointer nrrdWriter = WriterType::New();<br>
<br> //recover file names from command line arguments<br> const char * inputFilename = argv[1];<br> const char * outputFilename = argv[2];<br><br> reader->SetFileName( inputFilename );<br> nrrdWriter->UseInputMetaDataDictionaryOn();<br>
nrrdWriter->SetImageIO(io);<br> nrrdWriter->SetFileName(outputFilename);<br><br> // processing pipeline:<br> filter->SetInput( reader->GetOutput() );<br> nrrdWriter->SetInput( filter->GetOutput() );<br>
<br> try <br> { <br> //execute the pipeline<br> nrrdWriter->Update(); <br> } <br> catch( itk::ExceptionObject & err ) <br> { <br> std::cerr << "ExceptionObject caught !" << std::endl; <br>
std::cerr << err << std::endl; <br> return EXIT_FAILURE;<br> } <br><br>This didn't work! I guess the following part would help (copied from<a href="http://www.itk.org/Wiki/Getting_Started_with_the_NRRD_Format" target="_blank"> here</a>)<br>
<pre style="font-family:arial,helvetica,sans-serif"> itk::NrrdImageIO::Pointer io = itk::NrrdImageIO::New();
// This statement is to be added to the ITK CVS Release
<b>io->SetNrrdVectorType( nrrdKindList )</b>;
io->SetFileType( itk::ImageIOBase::ASCII );</pre>But it was not possible because "SetNrrdVectorType" does not exist...<br><br>Anyway: is there a file format to save vector images and how to do???<br><br>Thanks for your help!<br>
<font color="#888888">
<br>Melanie</font><div><div></div><div class="h5"><br><br><br><div class="gmail_quote">2011/4/5 Melanie Uks <span dir="ltr"><<a href="mailto:meluks2010@googlemail.com" target="_blank">meluks2010@googlemail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Ok, I try to. I will contact you, if I need help for the example...<br><font color="#888888">Melanie</font><div><div></div><div><br><br><div class="gmail_quote">2011/4/5 David Doria <span dir="ltr"><<a href="mailto:daviddoria@gmail.com" target="_blank">daviddoria@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="gmail_quote"><div>On Tue, Apr 5, 2011 at 5:32 AM, Sergio Vera <span dir="ltr"><<a href="mailto:sergio.vera@alma3d.com" target="_blank">sergio.vera@alma3d.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi, Melanie<div>Indeed, using that filter you will obtain only the gradient magnitude.</div><div><br></div><div>If you need the gradient as a vector image, use <a href="http://www.itk.org/Doxygen320/html/classitk_1_1GradientRecursiveGaussianImageFilter.html#_details" target="_blank">http://www.itk.org/Doxygen320/html/classitk_1_1GradientRecursiveGaussianImageFilter.html#_details</a> for instance</div>
<div><br></div><div>regards<br></div></blockquote><div><br></div></div><div>Melanie,</div><div><br>It looks like we do not have an example of GradientRecursiveGaussianImageFilter. If you could add one here: </div><a href="http://www.itk.org/Wiki/ITK/Examples#Image_Edges.2C_Gradients.2C_and_Derivatives" target="_blank">http://www.itk.org/Wiki/ITK/Examples#Image_Edges.2C_Gradients.2C_and_Derivatives</a><div>
<br></div><div><a href="http://www.itk.org/Wiki/ITK/Examples#Image_Edges.2C_Gradients.2C_and_Derivatives" target="_blank"></a>once you get this working it would be a great help.<br><br></div><div>David </div></div></div>
</blockquote></div><br>
</div></div></blockquote></div><br>
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