Threshold.hxx

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/* ImLib3D
 * Copyright (c) 2001, ULP-IPB Strasbourg.
 *
 * 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; either version 2 of the License, or (at
 * your option) any later version.
 * 
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#ifndef _Threshold_hxx
#define _Threshold_hxx

#include<ImLib3D/ImageStats.hpp>


template <class ImageType>
void
IP3D::OtsuThresholds(const ImageType& src, Mask3D& res,int nbClasses,vector<double> *pthresholds,int nbBins)
{
    res.Resize(src.Size());
    // inplace
    
    vector<float> values;
    typename ImageType::const_iteratorFast p;
    for(p=src.begin();p!=src.end();++p){values.push_back((float)*p);}

    ProbabilityDistribution dist;
    dist.SetWithSamples(values,nbBins);

    vector<double> thresholds;
    dist.OtsuThreshholds(nbClasses,thresholds);

    mprintf("OtsuThreshholds::Apply: thresholds:\n");
    for(uint i=0;i<thresholds.size();i++)
    {
        mprintf("   thresholds:%d:%f\n",i,thresholds[i]);
    }

    Mask3D::iteratorFast rp;
    for(p=src.begin(),rp=res.begin();rp!=res.end();p++,rp++)
    {
        *rp=0;
        for(uint i=0;i<thresholds.size();i++){if(*p>=thresholds[i]){*rp=i+1;}}
    }
    if(pthresholds){*pthresholds=thresholds;}
}




#endif // _Threshold_hxx

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