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//===========================================================================
// The Level-Set Segmentation Library (LSSEG)
//
//
// Copyright (C) 2000-2005 SINTEF ICT, Applied Mathematics, Norway.
//
// This program is free software; you can redistribute it and/or          
// modify it under the terms of the GNU General Public License            
// as published by the Free Software Foundation version 2 of the License. 
//
// This program 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 General Public License for more details.                           
//
// You should have received a copy of the GNU General Public License      
// along with this program; if not, write to the Free Software            
// Foundation, Inc.,                                                      
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//
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// SINTEF ICT, Department of Applied Mathematics,                         
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// Other licenses are also available for this software, notably licenses
// for:
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//===========================================================================
//===========================================================================
//                                                                           
// File: Histogram.h                                                         
//                                                                           
// Created: Fri Mar 31 16:41:35 2006                                         
//                                                                           
// Author: Odd A. Andersen <Odd.Andersen@sintef.no>
//                                                                           
// Revision: $Id: Histogram.h,v 1.5 2006/11/13 02:29:25 oan Exp $
//                                                                           
// Description:
//                                                                           
//===========================================================================

#ifndef _HISTOGRAM_H
#define _HISTOGRAM_H

#include <vector>
#include <iostream>

namespace lsseg {

//===========================================================================
class Histogram
//===========================================================================
{
public:
    Histogram() {} 

    Histogram(double min, double max, int num_bins) 
    {
        init(min, max, num_bins); 
    }
    
    void init (double min, double max, int num_bins) 
    {
        range_min_ = min;
        range_max_ = max;
        dist_ = std::vector<double>(num_bins, 0);
        bin_factor_ = double(num_bins) / (max - min);
    }

    int numBins() const { return dist_.size(); }

    double rangeMin() const { return range_min_; }

    double rangeMax() const { return range_max_; }
    std::vector<double>& binValues() { return dist_; }
    
    void blur(double sigma);

    int getBin(double val) const ;
    
    double valueFor(double val) const ;

    void write(std::ostream& os) const;

    void read(std::istream& is);

private:

    double range_min_;
    double range_max_;
    
    double bin_factor_;

    std::vector<double> dist_;
};

}; // end namespace lsseg

#endif // _HISTOGRAM_H

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