vcglib/vcg/math/histogram.h

118 lines
3.7 KiB
C++

/****************************************************************************
* VCGLib o o *
* Visual and Computer Graphics Library o o *
* _ O _ *
* Copyright(C) 2004 \/)\/ *
* Visual Computing Lab /\/| *
* ISTI - Italian National Research Council | *
* \ *
* All rights reserved. *
* *
* 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 (http://www.gnu.org/licenses/gpl.txt) *
* for more details. *
* *
****************************************************************************/
/****************************************************************************
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****************************************************************************/
#ifndef __VCG_HISTOGRAM
#define __VCG_HISTOGRAM
//#include <vcg/Box2.h>
namespace vcg {
/**
*/
template <class ScalarType>
class Histogram {
public:
std::vector <int> H; /// counters for bins
std::vector <ScalarType> R; /// Range for bins (
ScalarType minv;
ScalarType maxv;
int n; // numero di intervalli
int cnt; // numero di campioni accumulati
ScalarType avg;
ScalarType rms;
void SetRange(ScalarType _minv, ScalarType _maxv, int _n);
void SetRange(ScalarType _minv, ScalarType _maxv, int _n, ScalarType gamma);
int Interize(ScalarType val);
void Add(ScalarType v);
ScalarType Percentile(ScalarType frac) const;
ScalarType Avg();
ScalarType RMS();
ScalarType Variance();
ScalarType StandardDeviation();
void Clear();
};
template <class ScalarType>
void Histogram<ScalarType> ::Clear()
{
H.clear();
R.clear();
cnt=0;
avg=0;
rms=0;
n=0;
minv=0;
maxv=1;
}
template <class ScalarType>
void Histogram<ScalarType>::SetRange(ScalarType _minv, ScalarType _maxv, int _n)
{
Clear();
minv=_minv;maxv=_maxv;n=_n;
H.resize(n+1);
fill(H.begin(),H.end(),0);
R.resize(n+1);
ScalarType dlt=(maxv-minv)/n;
for(int i=0;i<n+1;++i)
R[i]=minv+dlt*i;
}
template <class ScalarType>
void Histogram<ScalarType>::SetRange(ScalarType _minv, ScalarType _maxv, int _n, ScalarType gamma)
{
Clear();
minv=_minv;maxv=_maxv;n=_n;
H.resize(n);
fill(H.begin(),H.end(),0);
R.resize(n+1);
double dlt=(maxv-minv);
for(int i=0;i<n+1;++i)
R[i]=minv+dlt*pow(double(i)/n,gamma);
}
template <class ScalarType>
int Histogram<ScalarType>::Interize(ScalarType val)
{
int pos = lower_bound(R.begin(),R.end(),val) - R.begin() - 1;
if(pos>n) pos=n;
return pos;
}
template <class ScalarType>
void Histogram<ScalarType>::Add(ScalarType v){
int pos= lower_bound(R.begin(),R.end(),v)-R.begin()-1;
if(pos<=n){
++H[pos];
++cnt;
avg+=v;
rms += v*v;
}
}
}// end namespace
#endif