470 lines
13 KiB
C++
470 lines
13 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 1.18 2008/03/05 11:21:49 cignoni
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Heavily refactored the whole structure.
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Some interfaces have been changed. Be careful.
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Revision 1.17 2008/02/29 12:15:06 cignoni
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added maxcount
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Revision 1.16 2006/11/28 21:29:21 cignoni
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Re added typedef Histogramf and Histogramd
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Revision 1.15 2006/11/28 09:47:42 corsini
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add documentation
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fix typo
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Revision 1.14 2006/05/04 00:09:53 cignoni
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minor change: removed unused vars
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Revision 1.13 2006/03/29 09:25:47 zifnab1974
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extra includes necessary for compilation of meshlab on AMD 64 with gcc 3.4.5
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Revision 1.12 2006/01/12 13:12:54 callieri
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in FileWrite, added file closing after finishing
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Revision 1.11 2005/09/16 11:51:23 cignoni
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removed signed/unsigned warning
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Revision 1.10 2005/06/17 00:54:55 cignoni
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Corrected small bug in SetRange (H was resized to n instead of n+1)
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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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#include <string>
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#include <limits>
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#include <vcg/math/base.h>
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#include <stdio.h>
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namespace vcg {
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template <class ScalarType>
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class Distribution
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{
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private:
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std::vector<ScalarType> vec;
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bool dirty;
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double valSum;
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double sqrdValSum;
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double avg;
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double sqrdAvg;
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double rms;
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double min_v;
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double max_v;
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public:
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Distribution() { Clear(); }
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void Clear()
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{
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vec.clear();
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dirty=true;
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min_v = std::numeric_limits<float>::max();
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max_v = -std::numeric_limits<float>::max();
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}
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void Add(const ScalarType v)
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{
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vec.push_back(v);
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dirty=true;
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if(v<min_v) min_v=v;
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if(v>max_v) max_v=v;
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}
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ScalarType Min() { return min_v; }
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ScalarType Max() { return max_v; }
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ScalarType Avg(){ DirtyCheck(); return avg;}
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//! Returns the Root Mean Square of the data.
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ScalarType RMS(){ DirtyCheck(); return rms;}
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//! Returns the variance of the data.
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// the average of the squares less the square of the average.
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ScalarType Variance(){ DirtyCheck(); return sqrdAvg - avg*avg ;}
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//! Returns the standard deviation of the data.
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ScalarType StandardDeviation(){ DirtyCheck(); return sqrt( Variance() );}
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void DirtyCheck()
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{
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if(!dirty) return;
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std::sort(vec.begin(),vec.end());
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valSum=0;
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sqrdValSum=0;
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typename std::vector<ScalarType>::iterator vi;
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for(vi=vec.begin();vi!=vec.end();++vi)
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{
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valSum += double(*vi);
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sqrdValSum += double(*vi)*double(*vi);
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}
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avg = valSum/double(vec.size());
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sqrdAvg = sqrdValSum/double(vec.size());
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rms = math::Sqrt(sqrdAvg);
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dirty=false;
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}
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ScalarType Percentile(ScalarType perc)
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{
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assert(!vec.empty());
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assert(perc>=0 && perc<=1);
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DirtyCheck();
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int index = vec.size() *perc -1;
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if(index< 0 ) index = 0;
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return vec[index];
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}
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};
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/**
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* Histogram.
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*
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* This class implements a single-value histogram.
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*/
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template <class ScalarType>
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class Histogram
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{
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// public data members
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protected:
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std::vector <ScalarType> H; //! Counters for bins.
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std::vector <ScalarType> R; //! Range for bins.
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ScalarType minv; //! Minimum value.
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ScalarType maxv; //! Maximum value.
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ScalarType minElem; //! Minimum value.
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ScalarType maxElem; //! Maximum value.
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int n; //! Number of vaild intervals stored between minv and maxv.
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/// incrementally updated values
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ScalarType cnt; //! Number of accumulated samples.
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ScalarType avg; //! Average.
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ScalarType rms; //! Root mean square.
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/**
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* Returns the index of the bin which contains a given value.
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*/
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int BinIndex(ScalarType val) ;
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// public methods
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public:
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/**
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* Set the histogram values.
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*
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* This method is used to correctly initialize the bins of the histogram.
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* n is the number of valid intervals between minv and maxv.
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* for a more robust working, the Histogram class stores also the two out of range intervals (-inf, minv] and [maxv, +inf)
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* Each bin is left closed (eg it contains the value
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* The \a gamma parameter is applied to modify the distribution of the ranges of the bins. Default uniform distibution.
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*
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*/
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void SetRange(ScalarType _minv, ScalarType _maxv, int _n,ScalarType gamma=1.0 );
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ScalarType MinV() {return minv;}; //! Minimum value.
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ScalarType MaxV() {return maxv;}; //! Maximum value.
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ScalarType MinElem() {return minElem;}; //! Minimum element added to the histogram. It could be < or > than MinV;.
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ScalarType MaxElem() {return maxElem;}; //! Maximum element added to the histogram. It could be < or > than MinV;..
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/**
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* Add a new value to the histogram.
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*
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* The statistics related to the histogram data (average, RMS, etc.) are
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* also updated.
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*/
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void Add(ScalarType v, ScalarType increment=ScalarType(1.0));
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ScalarType MaxCount() const;
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int BinNum() const {return n;};
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ScalarType BinCount(ScalarType v);
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ScalarType BinCountInd(int index) {return H[index];}
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ScalarType BinCount(ScalarType v, ScalarType width);
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ScalarType BinLowerBound(int index) {return R[index];}
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ScalarType BinUpperBound(int index) {return R[index+1];};
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ScalarType RangeCount(ScalarType rangeMin, ScalarType rangeMax);
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ScalarType BinWidth(ScalarType v);
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/**
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* Returns the value corresponding to a given percentile of the data.
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*
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* The percentile range between 0 and 1.
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*/
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ScalarType Percentile(ScalarType frac) const;
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//! Returns the average of the data.
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ScalarType Avg(){ return avg/cnt;}
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//! Returns the Root Mean Square of the data.
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ScalarType RMS(){ return sqrt(rms/double(cnt));}
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//! Returns the variance of the data.
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ScalarType Variance(){ return fabs(rms/cnt-Avg()*Avg());}
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//! Returns the standard deviation of the data.
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ScalarType StandardDeviation(){ return sqrt(Variance());}
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//! Dump the histogram to a file.
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void FileWrite(const std::string &filename);
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//! Reset histogram data.
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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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minElem = std::numeric_limits<ScalarType>::max();
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maxElem = -std::numeric_limits<ScalarType>::max();
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}
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/*
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Note that the histogram holds <n> valid bins plus two semi-infinite bins.
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R[0] = -inf
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R[1] = minv
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R[n+1] = maxv
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R[n+2] = +inf
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Eg. SetRange(0, 10, 5) asks for 5 intervals covering the 0..10 range
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H[0] H[1] H[2] H[3] H[4] H[5] H[6]
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-inf 0 2 4 6 8 10 +inf
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R[0] R[1] R[2] R[3] R[4] R[5] R[6] R[7]
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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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// reset data
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Clear();
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minv=_minv;maxv=_maxv;n=_n;
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H.resize(n+2);
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fill(H.begin(),H.end(),0);
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R.resize(n+3);
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R[0] = - std::numeric_limits< ScalarType >::max();
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R[n+2] = std::numeric_limits< ScalarType >::max();
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double delta=(maxv-minv);
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if(gamma==1)
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{
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for(int i=0; i<=n; ++i)
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R[i+1] = minv + delta*ScalarType(i)/n;
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}
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else
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{
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for(int i=0; i<=n; ++i)
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R[i+1] = minv + delta*pow(ScalarType(i)/n,gamma);
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}
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}
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template <class ScalarType>
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int Histogram<ScalarType>::BinIndex(ScalarType val)
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{
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// lower_bound returns the furthermost iterator i in [first, last) such that, for every iterator j in [first, i), *j < value.
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// E.g. An iterator pointing to the first element "not less than" val, or end() if every element is less than val.
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typename std::vector<ScalarType>::iterator it = lower_bound(R.begin(),R.end(),val);
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assert(it!=R.begin());
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assert(it!=R.end());
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assert((*it)>=val);
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int pos = it-R.begin();
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assert(pos >=1);
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pos -= 1;
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assert (R[pos] < val);
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assert ( val <= R[pos+1] );
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return pos;
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}
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/*
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H[0] H[1] H[2] H[3] H[4] H[5] H[6]
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-inf 0 2 4 6 8 10 +inf
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R[0] R[1] R[2] R[3] R[4] R[5] R[6] R[7]
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asking for 3.14 lower bound will return an iterator pointing to R[3]==4; and will increase H[2]
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asking for 4 lower bound will return an iterator pointing to R[3]==4; and will increase H[2]
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*/
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template <class ScalarType>
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void Histogram<ScalarType>::Add(ScalarType v, ScalarType increment)
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{
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int pos=BinIndex(v);
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if(v<minElem) minElem=v;
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if(v>maxElem) maxElem=v;
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if(pos>=0 && pos<=n)
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{
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H[pos]+=increment;
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cnt+=increment;
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avg+=v*increment;
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rms += (v*v)*increment;
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}
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}
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template <class ScalarType>
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ScalarType Histogram<ScalarType>::BinCount(ScalarType v)
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{
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return H[BinIndex(v)];
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}
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template <class ScalarType>
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ScalarType Histogram<ScalarType>::BinCount(ScalarType v, ScalarType width)
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{
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return RangeCount(v-width/2.0,v+width/2.0);
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}
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template <class ScalarType>
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ScalarType Histogram<ScalarType>::RangeCount(ScalarType rangeMin, ScalarType rangeMax)
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{
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int firstBin=BinIndex(rangeMin);
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int lastBin=BinIndex (rangeMax);
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ScalarType sum=0;
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for(int i=firstBin; i<=lastBin;++i)
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sum+=H[i];
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return sum;
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}
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template <class ScalarType>
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ScalarType Histogram<ScalarType>::BinWidth(ScalarType v)
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{
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int pos=BinIndex(v);
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return R[pos+1]-R[pos];
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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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{
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FILE *fp;
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fp=fopen(filename.c_str(),"w");
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for(unsigned 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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fclose(fp);
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}
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template <class ScalarType>
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ScalarType Histogram<ScalarType>::MaxCount() const
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{
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return *(std::max_element(H.begin(),H.end()));
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}
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// Return the scalar value <r> such that there are <frac> samples <= <r>.
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// E.g. Percentile(0.0) will return R[1] e.g. min value
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// E.g. Percentile(1.0) will return R[n+1] e.g max value
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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)
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return 0;
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// check percentile range
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assert(frac >= 0 && frac <= 1);
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ScalarType sum=0,partsum=0;
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size_t i;
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// useless summation just to be sure
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for(i=0;i<H.size();i++) sum+=H[i];
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assert(sum==cnt);
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sum*=frac;
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for(i=0; i<H.size(); i++)
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{
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partsum+=H[i];
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if(partsum>=sum) break;
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}
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assert(i<H.size());
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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 (vcg)
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#endif /* __VCG_HISTOGRAM */
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