[Insight-users] Problems with fixedReader->Update();

[motes motes]

Ok the error has been related to this line:

        fieldWriter->Update();

all the time, but I still cannot understand why. Have made sure to specify :

  typedef   unsigned char  PixelType;


 Any help appreciated!





2009/7/21 motes motes <mort.motes at gmail.com>

> The error has moved on to when I try to create the deformation field in the
> BSplineWarping1.cxx example (modified slightly below)
>
>
>   typedef itk::Point<float,
> ImageDimension>                                               PointType;
>   typedef itk::Vector<float,
> ImageDimension>                                              VectorType;
>   typedef itk::Image<VectorType,
> ImageDimension>
> DeformationFieldType;
>   typedef
> TransformType::SpacingType
> SpacingType;
>   typedef
> TransformType::ParametersType
> ParametersType;
>   typedef
> TransformType::OriginType
> OriginType;
>   typedef
> itk::ImageRegionIterator<DeformationFieldType>
> FieldIterator;
>   typedef
> itk::ImageFileWriter<DeformationFieldType>
> FieldWriterType;
>
>   DeformationFieldType::Pointer field = DeformationFieldType::New();
>   FieldWriterType::Pointer fieldWriter = FieldWriterType::New();
>
> ...
> ...
>
> std::string in_field = "c:\deformed_field.png";
>
>     fieldWriter->SetInput( field );
>
>         if( !in_field.empty() )
>     {
>       fieldWriter->SetFileName(in_field);
>       try
>       {
>         fieldWriter->Update();
>       }
>       catch( itk::ExceptionObject & excp )
>       {
>         std::cerr << "Exception thrown " << std::endl;
>         std::cerr << excp << std::endl;
>         return EXIT_FAILURE;
>       }
>     }
>
>
> Should the deformation field have a certain type?
>
>
>
> 2009/7/21 motes motes <mort.motes at gmail.com>
>
> Ok in the followup its recommended to change the type of PixelType to:
>>
>> typedef unsigned char  PixelType;
>>
>> or
>>
>> typedef unsigned short   PixelType;
>>
>>
>> But I already declared it as :
>>
>> typedef unsigned char  PixelType;
>>
>> and I have also tried:
>>
>> typedef unsigned short   PixelType;
>>
>> but I still get the same error, any ideas?
>>
>>
>>
>>
>> 2009/7/21 Ramón Casero Cañas <ramon.casero at comlab.ox.ac.uk>
>>
>> motes motes wrote:
>>>
>>>>
>>>> But the call:
>>>>      fixedReader->Update();
>>>>
>>>> throws the exception:
>>>>
>>>> Exception thrown
>>>>
>>>> itk::ExceptionObject (00CAE438)
>>>> Location: "void __thiscall itk::PNGImageIO::WriteSlice(const class
>>>> std::basic_string<char,struct std::char_traits<c
>>>> har>,class std::allocator<char> > &,const void *)"
>>>> File: ..\..\..\Code\IO\itkPNGImageIO.cxx
>>>> Line: 473
>>>> Description: PNG supports unsigned char and unsigned short
>>>>
>>>>
>>>> I have tried removing the update() call but then I get an error further
>>>> down
>>>> the code. It seems that the error is related to the PNG format of the
>>>> file,
>>>> any ideas?
>>>>
>>>
>>> Hi motes,
>>>
>>> A quick search in google of the error, i.e. search for
>>>
>>> "Description: PNG supports unsigned char and unsigned short"
>>>
>>> shows that this problem has been addressed in a previous thread of this
>>> list
>>>
>>> http://www.itk.org/pipermail/insight-users/2006-September/019320.html
>>>
>>> Cheers,
>>>
>>> Ramon.
>>>
>>> --
>>> Ramón Casero Cañas, DPhil
>>>
>>> Computational Biology, Computing Laboratory
>>> University of Oxford
>>> Wolfson Building, Parks Rd
>>> Oxford OX1 3QD
>>>
>>> tlf     +44 (0) 1865 610807
>>> web     http://web.comlab.ox.ac.uk/people/Ramon.CaseroCanas
>>> photos  http://www.flickr.com/photos/rcasero/
>>>
>>>
>>
>
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