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// Copyright (C) 2010 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#ifndef DLIB_MR_FUNCTION_ObJECTS_H__
#define DLIB_MR_FUNCTION_ObJECTS_H__
#include "function_objects_abstract.h"
#include "../matrix.h"
#include <cmath>
#include <limits>
namespace dlib
{
// ----------------------------------------------------------------------------------------
struct squared_euclidean_distance
{
squared_euclidean_distance (
) :
lower(0),
upper(std::numeric_limits<double>::infinity())
{}
squared_euclidean_distance (
const double l,
const double u
) :
lower(l),
upper(u)
{}
const double lower;
const double upper;
template <typename sample_type>
double operator() (
const sample_type& a,
const sample_type& b
) const
{
const double len = length_squared(a-b);
if (lower <= len && len <= upper)
return len;
else
return std::numeric_limits<double>::infinity();
}
};
// ----------------------------------------------------------------------------------------
struct use_weights_of_one
{
template <typename edge_type>
double operator() (
const edge_type&
) const
{
return 1;
}
};
// ----------------------------------------------------------------------------------------
struct use_gaussian_weights
{
use_gaussian_weights (
)
{
gamma = 0.1;
}
use_gaussian_weights (
double g
)
{
gamma = g;
}
double gamma;
template <typename edge_type>
double operator() (
const edge_type& e
) const
{
return std::exp(-gamma*e.distance());
}
};
// ----------------------------------------------------------------------------------------
}
#endif // DLIB_MR_FUNCTION_ObJECTS_H__
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