[Insight-developers] AnisotropicDiffusionImageFilter derived class Error

[Antonio Calabrese]

Excuse me if I'm answering only now, 
I don't know if i can upload my code and an example image without some permission. I asked it to my Teacher and i'm waiting. I have to solve it as soon as possible so I'm going to express my problem in a better way than before:
I guess that my problem is that the GetDifferenceFunction(), an itkFiniteDifferenceFuction's method, which return me a null pointer.
I think I need to define the FiniteDifferenceFunction first and then pass it to my derived class.
The point is that I don't know how make it.

Thanks a lot, 
Antonio.

On 30/ago/2013, at 15:57, "Johnson, Hans J" <hans-johnson at uiowa.edu> wrote:

> Antonio,
> 
> If you post the small example to a location like github or gitorious the
> quality of response will be enormously improved.
> 
> Hans
> 
> 
> -----Original Message-----
> From: Matt McCormick <matt.mccormick at kitware.com>
> Date: Friday, August 30, 2013 8:56 AM
> To: Antonio Calabrese <calantoanto at gmail.com>
> Cc: ITK <insight-developers at itk.org>
> Subject: Re: [Insight-developers] AnisotropicDiffusionImageFilter derived
> class Error
> 
> Hi Antonio,
> 
> Welcome to the list :-).
> 
> Please include a full example with code, CMakeLists.txt, and a short test.
> 
> Thanks,
> Matt
> 
> On Fri, Aug 30, 2013 at 11:05 AM, Antonio Calabrese
> <calantoanto at gmail.com> wrote:
>> Hi to everyone
>> it's my first time that i write on this mailing list. I'm a Italian
>> Biomedical Engineer's student and i'm working on my final degree thesis.
>> I'm implementing an Anisotropic Filter that i wrote few months ago in
>> Matlab.
>> This filter is different from the other ITK's filters, because i try to
>> create an "automatic anisotropic filter" in which i don't need to set
>> conductance and number of iteration parameters, because the filter
>> calculates them alone.
>> Here below there's a part of my code where i tried to implementing the
>> ITK's
>> AnisotropicDiffusionImageFilter.
>> 
>> This's the class's derivation :
>> namespace itk
>> {
>>    template< class TInputImage, class TIOutputImage>
>>    class ITK_EXPORT MyAnisotropicDiffusionImageFilter:
>>    public AnisotropicDiffusionImageFilter<TInputImage, TIOutputImage>
>>    {
>>    public:
>>        /** Standard class typedefs. */
>>        typedef MyAnisotropicDiffusionImageFilter Self;
>>        typedef AnisotropicDiffusionImageFilter<TInputImage,
>> TIOutputImage>
>> Superclass;
>>        typedef SmartPointer< Self >       Pointer;
>>        typedef SmartPointer< const Self > ConstPointer;
>> 
>> 
>> 
>>        /** Standard method for creation through object factory. */
>>        itkNewMacro(Self);
>> 
>> 
>> 
>>        /** Extract superclass image dimension. */
>>        itkStaticConstMacro(ImageDimension, unsigned int,
>>                            Superclass::ImageDimension);
>> 
>> 
>> 
>> #ifdef ITK_USE_CONCEPT_CHECKING
>>        /** Begin concept checking */
>>        itkConceptMacro( OutputHasNumericTraitsCheck,
>>                        ( Concept::HasNumericTraits< typename
>> TInputImage::PixelType > ) );
>>        /** End concept checking */
>> #endif
>> 
>> 
>> 
>>    }; // end namspace itk
>> }
>> 
>> and this is its implementation
>> 
>> typedef itk::MyAnisotropicDiffusionImageFilter <FloatImageType,
>> FloatImageType> MyAnisotropicDiffusionImageFilterType;
>> MyAnisotropicDiffusionImageFilterType::Pointer
>> myAnisotropicDiffusionFilterPointer =
>> MyAnisotropicDiffusionImageFilterType::New();
>> 
>> myAnisotropicDiffusionFilterPointer->SetInput(workImagePointer);
>> 
>> myAnisotropicDiffusionFilterPointer->SetConductanceParameter(C);
>> myAnisotropicDiffusionFilterPointer->SetTimeStep(Time_step);
>> myAnisotropicDiffusionFilterPointer->SetNumberOfIterations(1);
>> myAnisotropicDiffusionFilterPointer->Update();
>> 
>> For the first time i subclassed it, and i don't have the experience to
>> understand which is the wrong thing that return me an error.
>> 
>> My filter crashes in an inheritance of the itkFiniteDifferenceImageFilter
>> where it dies when it reaches this point:
>> // Get the size of the neighborhood on which we are going to operate.
>> This
>> // radius is supplied by the difference function we are using.
>> RadiusType radius = this->GetDifferenceFunction()->GetRadius();
>> 
>> So, which is my error? Please someone give me a help.
>> Regards Antonio Calabrese.
>> 
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> _______________________________________________
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> 
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> 
> Kitware offers ITK Training Courses, for more information visit:
> http://kitware.com/products/protraining.php
> 
> Please keep messages on-topic and check the ITK FAQ at:
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