[Insight-users] image filter ThresholdInside?

[Luis Ibanez]

Hi Sharath,

The Thresholding filter that you need is too specific and doesn't
match the profile of any of the filters we currently have.

However, it will be *very* easy for you to write one by taking
advantage of the itkUnaryFunctorImageFilter.

You just need to write a Functor, and then instantiate the
itkUnaryFunctorImageFilter over the input image, output image
and the functor.


The functor that you need will look like:
(asumming that your images are using "unsigned char" pixel type).


namespace Functor {

class MyThreshold
{
public:
   MyThreshold() {};
   ~MyThreshold() {};

   bool operator!=( const BinaryThreshold & other ) const
     { return false; }
   bool operator==( const BinaryThreshold & other ) const
     { return !(*this != other); }

   inline unsigned char operator()( const unsigned char & A )
   {
     if ( A ==   0 ) { return   0; }
     if ( A == 255 ) { return 255; }
     if ( A <  127 ) { return 255; }
     return 0;
   }
private:
};
}


Then you can instantiate:


typedef itk::UnaryFunctorImageFilter<
   InputImageType, OutputImageType, Functor::MyThreshod > FilterType;

FilterType::Pointer filter = FilterType::New();




    Regards,


       Luis



-----------------------
Sharath Cholleti wrote:
> Hi,
> 
> I am new to ITK and started reading parts of the software guide as
> required.
> 
> I need to change the pixel values of an image to 255 if its value is
> between 1-127 and to 0 if its value is between 128-254. Keep all pixels
> of 0 and 255's as they are. I noticed ThresholdOutside function in
> ThresholdImageFilter but in a way I need a "ThresholdInside" function.  Is
> there such a function that would allow me to do this?
> 
> I looked at BinaryThresholdImageFilter and ThresholdImageFilter
> classes for this particular problem.
> 
> Thanks,
> 
> Sharath
> 
> 
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