188 lines
5.6 KiB
C++
188 lines
5.6 KiB
C++
/****************************************************************************
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* VCGLib o o *
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* Visual and Computer Graphics Library o o *
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* _ O _ *
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* Copyright(C) 2004 \/)\/ *
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* Visual Computing Lab /\/| *
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* ISTI - Italian National Research Council | *
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* \ *
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* All rights reserved. *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License (http://www.gnu.org/licenses/gpl.txt) *
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* for more details. *
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* *
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****************************************************************************/
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/****************************************************************************
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History
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$Log: not supported by cvs2svn $
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Revision 1.9 2005/06/14 14:27:00 ganovelli
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added include of algorithm
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Revision 1.8 2005/06/10 14:59:39 cignoni
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Added include assert.h and cast to ScalarType for a pow in SetRange() function.
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Revision 1.7 2005/06/09 14:19:55 cignoni
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Added typedef Histogramf and Histogramd
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Revision 1.6 2005/06/07 09:37:33 ponchio
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Added fabs() to variance, which can sometime be negative in case
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of rounding errors (and sqrt chokes on it).
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Revision 1.5 2005/06/07 07:44:08 cignoni
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Added Percentile and removed small bug in Add
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Revision 1.4 2005/04/04 10:48:35 cignoni
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Added missing functions Avg, rms etc, now fully (almost) functional
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Revision 1.3 2005/03/14 09:23:40 cignoni
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Added missing include<vector>
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Revision 1.2 2004/08/25 15:15:26 ganovelli
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minor changes to comply gcc compiler (typename's and stuff)
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Revision 1.1 2004/06/24 09:12:28 cignoni
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Initial Release
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****************************************************************************/
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#ifndef __VCG_HISTOGRAM
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#define __VCG_HISTOGRAM
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#include <vector>
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#include <algorithm>
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#include <assert.h>
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namespace vcg {
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/**
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*/
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template <class ScalarType>
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class Histogram {
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public:
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std::vector <int> H; /// counters for bins
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std::vector <ScalarType> R; /// Range for bins (
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ScalarType minv;
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ScalarType maxv;
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int n; // numero di intervalli
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int cnt; // numero di campioni accumulati
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ScalarType avg;
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ScalarType rms;
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void SetRange(ScalarType _minv, ScalarType _maxv, int _n);
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void SetRange(ScalarType _minv, ScalarType _maxv, int _n, ScalarType gamma);
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int Interize(ScalarType val);
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void Add(ScalarType v);
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ScalarType Percentile(ScalarType frac) const;
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ScalarType Avg() { return avg/cnt; }
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ScalarType RMS() { return sqrt(rms/double(cnt));}
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ScalarType Variance() { return fabs(rms/cnt-Avg()*Avg()); }
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ScalarType StandardDeviation() { return sqrt(Variance()); }
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void FileWrite(const std::string &filename);
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void Clear();
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};
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template <class ScalarType>
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void Histogram<ScalarType> ::Clear()
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{
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H.clear();
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R.clear();
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cnt=0;
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avg=0;
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rms=0;
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n=0;
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minv=0;
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maxv=1;
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}
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template <class ScalarType>
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void Histogram<ScalarType>::SetRange(ScalarType _minv, ScalarType _maxv, int _n)
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{
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Clear();
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minv=_minv;maxv=_maxv;n=_n;
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H.resize(n+1);
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fill(H.begin(),H.end(),0);
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R.resize(n+1);
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ScalarType dlt=(maxv-minv)/n;
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for(int i=0;i<n+1;++i)
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R[i]=minv+dlt*i;
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}
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template <class ScalarType>
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void Histogram<ScalarType>::SetRange(ScalarType _minv, ScalarType _maxv, int _n, ScalarType gamma)
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{
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Clear();
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minv=_minv;maxv=_maxv;n=_n;
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H.resize(n+1);
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fill(H.begin(),H.end(),0);
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R.resize(n+1);
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double dlt=(maxv-minv);
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for(int i=0;i<n+1;++i)
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R[i]=minv+dlt*pow(ScalarType(i)/n,gamma);
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}
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template <class ScalarType>
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int Histogram<ScalarType>::Interize(ScalarType val)
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{
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int pos = lower_bound(R.begin(),R.end(),val) - R.begin() - 1;
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if(pos>n) pos=n;
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return pos;
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}
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template <class ScalarType>
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void Histogram<ScalarType>::Add(ScalarType v){
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int pos= lower_bound(R.begin(),R.end(),v)-R.begin()-1;
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if(pos>=0 && pos<=n){
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++H[pos];
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++cnt;
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avg+=v;
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rms += v*v;
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}
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}
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template <class ScalarType>
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void Histogram<ScalarType>::FileWrite(const std::string &filename){
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FILE *fp;
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fp=fopen(filename.c_str(),"w");
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for(int i=0;i<H.size();i++)
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fprintf (fp,"%12.8lf , %12.8lf \n",R[i],double(H[i])/cnt);
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}
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template <class ScalarType>
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ScalarType Histogram<ScalarType>::Percentile(ScalarType frac) const
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{
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if(H.size()==0 && R.size()==0) return 0;
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assert(frac>=0 && frac<=1);
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ScalarType sum=0,partsum=0;
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int isum=0,ipartsum=0;
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int i;
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for(i=0;i<n+1;i++) { sum+=H[i]; isum+=H[i];}
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assert(isum==cnt);
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assert(sum==cnt);
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sum*=frac;
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for(i=0;i<n;i++) {
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partsum+=H[i];
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if(partsum>=sum) break;
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}
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return R[i+1];
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}
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typedef Histogram<double> Histogramd ;
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typedef Histogram<float> Histogramf ;
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}// end namespace
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#endif
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