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</o:shapelayout></xml><![endif]--></head><body lang=ZH-TW link=blue vlink=purple style='text-justify-trim:punctuation'><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Hi all,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>After extracting scalar components from vector image using itkVectorIndexSelectionCastImageFilter.h and some image processing on each of them, now I want to put these scalar images back into one vector image by using, idea searched from the insight user archive, itkImageToVectorImageFilter.h, a type conversion error occurred when I tried to write the “VectorImage” image from the output of itkImageToVectorImageFilter to the image file writer.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Type definition are shown:<o:p></o:p></span></p><p class=MsoNormal style='text-indent:24.0pt'><span lang=EN-US style='font-size:9.0pt;font-family:MingLiU;color:blue'>typedef</span><span lang=EN-US style='font-size:9.0pt;font-family:MingLiU'> itk::DiffusionTensor3D< PixelType > DTIPixelType;</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal style='text-indent:24.0pt;text-autospace:none'><span lang=EN-US style='font-size:9.0pt;font-family:MingLiU;color:blue'>typedef</span><span lang=EN-US style='font-size:9.0pt;font-family:MingLiU'> itk::Image< DTIPixelType, 3 > DTIImageType;<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.0pt;font-family:MingLiU'> <span style='color:blue'>typedef</span> itk::VectorImage< DTIPixelType, 6> DTIOutputImageType;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:9.0pt;font-family:MingLiU'> <span style='color:blue'>typedef</span> itk::Image< PixelType, 3 > ScalarImageType;<o:p></o:p></span></p><p class=MsoNormal style='text-indent:24.0pt;text-autospace:none'><span lang=EN-US style='font-size:9.0pt;font-family:MingLiU;color:blue'>typedef</span><span lang=EN-US style='font-size:9.0pt;font-family:MingLiU'> itk::VectorIndexSelectionCastImageFilter< DTIImageType, <o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.0pt;font-family:MingLiU'> ScalarImageType > VectorSelectType;<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.0pt;font-family:MingLiU'> <span style='color:blue'>typedef</span> itk::ImageToVectorImageFilter< ScalarImageType > VectorCombineType;<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.0pt;font-family:MingLiU'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.0pt;font-family:MingLiU'> <span style='color:blue'>typedef</span> itk::ImageFileReader< DTIImageType > ReaderType;<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.0pt;font-family:MingLiU'> <span style='color:blue'>typedef</span> itk::ImageFileWriter< ScalarImageType > WriterType;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:9.0pt;font-family:MingLiU'> <span style='color:blue'>typedef</span> itk::ImageFileWriter< DTIOutputImageType > DTIWriterType;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Error:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>If I assign a DTIOutputImageType::Pointer for the output of the ImageToVectorImageFilter and feed the writer the pointer, I get this<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.0pt;font-family:MingLiU'>1>.\ImageReadExportNifti4.cxx(177) : error C2440: 'initializing' : cannot convert from 'itk::VectorImage<TPixel,VImageDimension> *' to 'itk::SmartPointer<TObjectType>'<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.0pt;font-family:MingLiU'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US>If I put the output of the ImageToVectorImageFilter directly to the writer, I get this</span><span lang=EN-US style='font-size:9.0pt;font-family:MingLiU'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.0pt;font-family:MingLiU'>1>.\ImageReadExportNifti4.cxx(178) : error C2664: 'itk::ImageFileWriter<TInputImage>::SetInput' : cannot convert parameter 1 from 'itk::VectorImage<TPixel,VImageDimension> *' to 'const itk::VectorImage<TPixel,VImageDimension> *'<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I wonder if the problem is caused by the typedef of the images. I’m confused between “Vector” image type and “VectorImage” image type. Is there a specific writer for the VectorImage type? Or is there another way to do what I intended, combining scalar images to one vector image?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thank you in advance for your response.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Best regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Meng-Kang Hsieh (Michael)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>OpSciTech, Erasmus Mundus<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Delft University of Technology<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>