[Insight-users] NaryFunctorImageFilter Bug?

[Luis Ibanez]

Hi Sah,

If you compare the Binary and Ternary functor
image filters it should be quite straight
forward to figure out how to write a
Quaternary functor filter.

It comes down to adding another argument to
the functor, and capture a fourth input image
in the filter.


Please let us know if you need any help
in implementing this filter.


Thanks


   Luis



------------------
Sah Rayman wrote:

> Lius,
> 
> In fact, I need something with 4 inputs. My personal
> feeling is that iterator is much more easier to use in
> this case. 
> 
> Thanks for the help again.
> 
> Sah
> 
> --- Luis Ibanez <luis.ibanez at kitware.com> wrote:
> 
>>Hi Sah,
>>
>>
>>Thanks for pointing this out.
>>
>>This is actually a bug / design overlook.
>>
>>The simple solution in your case is to use
>>the
>>
>>
>>      itkTernaryFunctorImageFilter
>>
>>
>>which actually invokes the Functor with
>>three arguments.
>>
>>
>>As far as the itkNaryFunctorImageFitler is
>>concerned we should probably make the signature
>>of the functor to expect a FixedArray<> or an
>>Array<> as input so we can pass arbitrary numbers
>>of parameters to the functor.
>>
>>This issue has been entered in the Bug database
>>as Bug #628.
>>
>>
> 
> http://www.itk.org/Bug/bug.php?op=show&bugid=628&pos=14
> 
>>
>>
>>Please let us know if you have further questions.
>>
>>
>>Thanks
>>
>>
>>    Luis
>>
>>
>>
>>----------------------
>>Sah Rayman wrote:
>>
>>
>>>Seems I have trouble make NaryFunctorImageFilter
>>>working on 3 or more inputs.
>>>
>>>------------- Here are the code ---------------
>>>
>>>    typedef int PixelType;
>>>    typedef itk::Image< PixelType, 3> ImageType;
>>>
>>>    class TestFunctor3 {
>>>    public:
>>>        inline PixelType operator() (const
>>
>>PixelType
>>
>>>&in1, 
>>>            const PixelType &in2,
>>>            const PixelType &in3) {
>>>                
>>>                return 1;
>>>            }
>>>
>>>    };
>>>
>>>    class TestFunctor2 {
>>>    public:
>>>        inline PixelType operator() (const
>>
>>PixelType
>>
>>>&in1, 
>>>            const PixelType &in2) {
>>>                
>>>                return 1;
>>>            }
>>>
>>>    };
>>>
>>>
>>>    typedef itk::NaryFunctorImageFilter<
>>
>>ImageType,
>>
>>>ImageType, TestFunctor2> 
>>>        TestFilterType;
>>>
>>>    TestFilterType::Pointer myFilter;
>>>------------- End of the code ---------------
>>>
>>>Above code compiles fine. 
>>>But if we replace 
>>>typedef itk::NaryFunctorImageFilter< ImageType,
>>>ImageType, TestFunctor2> 
>>>        TestFilterType;
>>>with 
>>>typedef itk::NaryFunctorImageFilter< ImageType,
>>>ImageType, TestFunctor3> 
>>>        TestFilterType;
>>>
>>>the compiler will complain:
>>>
>>
> InsightToolkit-1.6.0\Code\BasicFilters\itkNaryFunctorImageFilter.txx(81)
> 
>>>: error C2064: term does not evaluate to a
>>
>>function
>>
>>>taking 2 arguments
>>>
>>>Can someone confirm this is a bug or let me know
>>
>>if I
>>
>>>did something incorrect?
>>>
>>>Thanks!
>>>
>>>
>>>
>>>
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>>
>>
>>
> 
> 
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