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/************************************************************************
*
* Copyright (C) 2022-2024 IRCAD France
*
* This file is part of Sight.
*
* Sight is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Sight is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Sight. If not, see <https://www.gnu.org/licenses/>.
*
***********************************************************************/
#pragma once
#include <sight/data/config.hpp>
#include <data/image.hpp>
#include <vector>
namespace sight::data::helper
{
/**
* @brief Helper class used to compute an image histogram.
*
*/
class SIGHT_DATA_CLASS_API histogram
{
public:
using histogram_t = std::vector<double>;
histogram(sight::data::image::csptr _image) :
m_image(_image)
{
}
/// Computes the number of pixels for every intensity
SIGHT_DATA_API void compute();
/// Samples the histogram given a bin width
[[nodiscard]] SIGHT_DATA_API histogram_t sample(size_t _bin_width) const;
[[nodiscard]] double max() const;
[[nodiscard]] double min() const;
private:
sight::data::image::csptr m_image;
histogram_t m_values;
double m_max {std::numeric_limits<double>::lowest()};
double m_min {std::numeric_limits<double>::max()};
};
//------------------------------------------------------------------------------
inline double histogram::max() const
{
return m_max;
}
//------------------------------------------------------------------------------
inline double histogram::min() const
{
return m_min;
}
} // namespace sight::data::helper
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