[Insight-developers] How to cast the itk::Image<PixelType, 3> * to itk::Image<itk::VariableLengthVector<PixelType>, 3> *

[Luis Ibanez]

Hi Binjie,


If you want to pass an itk::VectorImage as input to your filter:


VectorImageRegisterVersorRigidFilter<TInputImage,TOutputImage>


Then you MUST use

                                  itk::VectorImage<>

as the template argument of the VectorImageRegisterVersorRigidFilter.


Right now you are, incorrectly, using

                       NrrdImageType

as the template arguments of


> typedef itk::VectorImageRegisterVersorRigidFilter<NrrdImageType,
> NrrdImageType> RegisterFilterType;


That's the reason why the compiler tells you that it :


: cannot convert parameter 1 from '

             itk::VectorImage<TPixel,VImageDimension> > *

to          itk::Image<TPixel,VImageDimension> *


In your typedef of


> typedef itk::VectorImageRegisterVersorRigidFilter<NrrdImageType,
> NrrdImageType> RegisterFilterType;


You are promising this filter to give it a NrrdImageType, as input,
and instead you are giving it an itk::VectorImage.


Please make your template instantiations consistent with
your pipeline.


      Regards,


          Luis


--------------------------------------------------------------------------------------------
On Wed, Jan 27, 2010 at 10:43 PM, Binjie Qin <bjqin at sjtu.edu.cn> wrote:
> Dear Luis:
>
>   We follow your advice by using the ImageToVectorImageFilter to convert
> "itk::Image<PixelType, 3>*" to
> "itk::Image<itk::VariableLengthVector<PixelType>, 3>*", those codes are:
>
>   typedef itk::Image<PixelType,2>        ScalarImageType;
>   typedef itk::ImageToVectorImageFilter<ScalarImageType> FilterType;
>   FilterType::Pointer filter = FilterType::New();
>
>   typedef
> itk::VectorIndexSelectionCastImageFilter<NrrdImageType,IndexImageType>
> FixedImageType;
>   FixedImageType::Pointer fixedImageExtractionFilter =
> FixedImageType::New();
>   .
>   .
>   .
>
>   filter->SetInput(0,fixedImageExtractionFilter->GetOutput( ));
>   filter->Update();
>
>   typedef itk::VectorImageRegisterVersorRigidFilter<NrrdImageType,
> NrrdImageType> RegisterFilterType;
>   RegisterFilterType::Pointer registerImageFilter =
> RegisterFilterType::New();
>    .
>    .
>    .
>
>   registerImageFilter->SetFixedImage( filter->GetOutput());
>
>   However, the last line code still results in the same conversion error:
> error C2664:
> 'itk::VectorImageRegisterVersorRigidFilter<TInputImage,TOutputImage>::SetFixedImage'
> : cannot convert parameter 1 from 'itk::VectorImage<TPixel,VImageDimension>
> *' to 'itk::Image<TPixel,VImageDimension> *'
> 1>        with
> 1>        [
> 1>            TInputImage=NrrdImageType,
> 1>            TOutputImage=NrrdImageType
> 1>        ]
> 1>        and
> 1>        [
> 1>            TPixel=PixelType,
> 1>            VImageDimension=3
> 1>        ]
> 1>        and
> 1>        [
> 1>            TPixel=itk::VariableLengthVector<PixelType>,
> 1>            VImageDimension=3
> 1>        ]
> 1>        Types pointed to are unrelated; conversion requires
> reinterpret_cast, C-style cast or function-style cast
>
>
>
>
>
>
>
> On Tue, 26 Jan 2010 23:18:18 +0800, Luis Ibanez <luis.ibanez at kitware.com>
> wrote:
>
>> Hi bjqin at SJTU,
>>
>>
>> You may want to use the filter:
>>
>> Insight/Code/BasicFilters/
>>      itkImageToVectorImageFilter.h
>>
>>
>>   Regards,
>>
>>
>>        Luis
>>
>>
>>
>> ------------------------------------
>> On Mon, Jan 25, 2010 at 10:44 PM, Binjie Qin <bjqin at sjtu.edu.cn> wrote:
>>>
>>> Dear insight-developers:
>>>
>>>  There is PixelType (typedef signed short PixelType) conversion error of
>>> building gtractCoregBvalues at the GTRACT in the following code:
>>>
>>>  typedef
>>> itk::VectorIndexSelectionCastImageFilter<NrrdImageType,IndexImageType>
>>> FixedImageType;
>>>  FixedImageType::Pointer fixedImageExtractionFilter =
>>> FixedImageType::New();
>>>   .
>>>   .
>>>   .
>>>
>>>  typedef itk::VectorImageRegisterVersorRigidFilter<NrrdImageType,
>>> NrrdImageType> RegisterFilterType;
>>>   RegisterFilterType::Pointer registerImageFilter =
>>> RegisterFilterType::New();
>>>   .
>>>   .
>>>   .
>>>
>>>   registerImageFilter->SetFixedImage(
>>> fixedImageExtractionFilter->GetOutput( ) );
>>>
>>>
>>>   The outputimage PixelType of "fixedImageExtractionFilter->GetOutput( )"
>>> is TPixel=PixelType, PixelType is signed short.
>>>
>>>   However the inputimage PixelType of "registerImageFilter->SetFixedImage
>>> (itk::Image<TPixel,VImageDimension> *)" is
>>> TPixel=itk::VariableLengthVector<PixelType>
>>>
>>>   How to cast the "itk::Image<PixelType,3> *" to
>>> "itk::Image<itk::VariableLengthVector<PixelType>,3> *"?
>>>
>>>   The itkScalarToArrayCastImageFilter is not useful because the
>>> VariableLengthVector<PixelType> is not a fixed array .
>>>
>>>   If the cast should be implemented with static_cast of each PixelType by
>>> accessing each pixel value?
>>>
>>>
>>>   Thank you in advance.
>>>
>>>
>>> bjqin at SJTU
>>>
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>
>
> --
> Binjie Qin, Ph.D.
> Associate Professor
> Dept. of Biomedical Engineering
> Shanghai Jiao Tong University
> 800 Dongchuan Road, Min Hang
> Shanghai, P. R. China, 200240
> Phone: 86-21-34204382,86-138-1635-5349
> Fax: 86-21-34205709
> Email:bjqin at sjtu.edu.cn
>