class ExtractImageFilterGeneric
!!!185858.cpp!!!	Process() : void
    bbtkDebugMessageInc("Core",9,
			"bbitk::ExtractImageFilterGeneric::Process<"
			<<bbtk::TypeName<T>()<<">()"<<std::endl);
    // T is the type of input image
    typedef T ImageType;
    // We define the type of the filter to use which is template 
    // on the image type
    typedef ExtractImageFilter<ImageType> FilterType;
    // Allocate the filter
    typename FilterType::Pointer f = FilterType::New("Temp");

    // Set the input In of the filter
    // Here we :
    // 1) Get **OUR** input 'In' by bbGetInputIn()
    //    It is a anyImagePointer
    // 2) We **KNOW** that the actual type stored by the anyImagePointer
    //    is ImageType* hence we get the value stored using the 
    //    unsafe_get method (which is a template method on the return type)
    f->bbSetInputIn( this->bbGetInputIn().unsafe_get<ImageType*>() );
    
    // The same for the ImageRegion except that we use 'get' and not 
    // 'unsafe get' because the region dimension passed by the user may not be 
    // compatible with the image dimension.
    // If get fails it throws an exception which must be caught outside 
    f->bbSetInputExtractionRegion ( this->bbGetInputRegion().get<typename T::RegionType>() );

    // Execute the filter
    f->bbExecute();
    // Register its output or it will be deleted we delete the filter
    f->bbGetOutputOut()->Register();
    // Set OUR output
    this->bbSetOutputOut( f->bbGetOutputOut() );
    // Delete the temporary filter
    f->bbDelete();

    bbtkDebugDecTab("Core",9);