support.h

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#ifndef SUPPORT_H_
#define SUPPORT_H_

#include "deghosting.h"

#include <vigra/functorexpression.hxx>
// used in hugin_hdrmerge
// FIXME: move it to the hugin_hdrmerge
#include <vigra/combineimages.hxx>

namespace deghosting {

template <class PixelType>
class LogarithmFunctor {
    public:
        explicit LogarithmFunctor(PixelType off=0) : offset(off)  {}
        
        PixelType operator()(PixelType const& v) const {
            return std::log(v + offset);
        }
    protected:
        PixelType offset;
};

template <class ComponentType>
class LogarithmFunctor<vigra::RGBValue<ComponentType> > {
    public:
        explicit LogarithmFunctor(ComponentType off=0) : offset(off) {}
        
        vigra::RGBValue<ComponentType> operator()(vigra::RGBValue<ComponentType> const& v) const {
            vigra::RGBValue<ComponentType> retVal;
            retVal[0] = log(v[0] + offset);
            retVal[1] = log(v[1] + offset);
            retVal[2] = log(v[2] + offset);
            //cout << retVal[0] << "," << retVal[1] << "," << retVal[2] << std::endl;
            return retVal;
        }
    protected:
        ComponentType offset;
};

template <class PixelType>
class HatFunctor {
    public:
        HatFunctor() {}
        
        PixelType operator()(PixelType v) const {
            PixelType t = (v/127.5 -1);
            t *= t; // ^2
            t *= t; // ^4
            t *= t; // ^8
            t *= t; // ^16
            return 1.0 - t; 
        }
};

template <class ComponentType>
class HatFunctor<vigra::RGBValue<ComponentType> > {
    public:
        HatFunctor() {}
        
        ComponentType operator()(vigra::RGBValue<ComponentType> v) const {
            ComponentType t = (v.luminance()/127.5 -1);
            t *= t; // ^2
            t *= t; // ^4
            t *= t; // ^8
            t *= t; // ^16
            return 1.0 - t; 
        }
};

template <class PixelType>
class NormalizeFunctor {
    public:
        explicit NormalizeFunctor(PixelType f) : factor(f) {}
        NormalizeFunctor(PixelType oldMaxValue, PixelType newMaxValue) : factor(newMaxValue/oldMaxValue) {}
        
        PixelType operator()(PixelType const &v) const {
            return v*factor;
        }
    protected:
        PixelType factor;
};

template <class ComponentType>
class NormalizeFunctor<vigra::RGBValue<ComponentType> > {
    public:
        NormalizeFunctor(vigra::RGBValue<ComponentType> oldMaxValue, vigra::RGBValue<ComponentType> newMaxValue) {
            // TODO
        }
        
        vigra::RGBValue<ComponentType> operator()(vigra::RGBValue<ComponentType> const &v) {
            // TODO
        }
    protected:
        vigra::RGBValue<ComponentType> foo;
};

}  // namespace deghosting

#endif /* SUPPORT_H_ */