#include <DTCombinatorialPatternReco.h>

Inheritance diagram for DTCombinatorialPatternReco:

Classes
class	TriedPattern
Public Types
typedef boost::unordered_set < TriedPattern >	TriedPatterns
Public Member Functions
virtual std::string	algoName () const
	return the algo name
	DTCombinatorialPatternReco (const edm::ParameterSet &pset)
	Constructor.
virtual edm::OwnVector < DTSLRecSegment2D >	reconstruct (const DTSuperLayer *sl, const std::vector< DTRecHit1DPair > &hits)
	this function is called in the producer
virtual void	setES (const edm::EventSetup &setup)
virtual	~DTCombinatorialPatternReco ()
	Destructor.
Private Types
typedef std::pair < DTHitPairForFit *, DTEnums::DTCellSide >	AssPoint
Private Member Functions
DTSegmentCand *	buildBestSegment (std::vector< AssPoint > &assHits, const DTSuperLayer *sl)
void	buildPointsCollection (std::vector< AssPoint > &points, std::deque< DTHitPairForFit * > &pointsNoLR, std::vector< DTSegmentCand * > &candidates, const DTSuperLayer *sl)
std::vector< DTSegmentCand * >	buildSegments (const DTSuperLayer sl, const std::vector< DTHitPairForFit > &hits)
bool	checkDoubleCandidates (std::vector< DTSegmentCand * > &segs, DTSegmentCand *seg)
std::vector< AssPoint >	findCompatibleHits (const LocalPoint &pos, const LocalVector &dir, const std::vector< DTHitPairForFit * > &hits)
std::vector< DTHitPairForFit * >	initHits (const DTSuperLayer *sl, const std::vector< DTRecHit1DPair > &hits)
Private Attributes
bool	debug
std::string	theAlgoName
double	theAlphaMaxPhi
double	theAlphaMaxTheta
DTSegmentCleaner *	theCleaner
edm::ESHandle< DTGeometry >	theDTGeometry
unsigned int	theMaxAllowedHits
TriedPatterns	theTriedPattern
DTSegmentUpdator *	theUpdator
bool	usePairs
Friends
class	DTCombinatorialPatternReco4D

Detailed Description

Algo for reconstructing 2d segment in DT using a combinatorial approach

Date:: 2009/11/27 11:59:48

Revision:: 1.12

Author:: Stefano Lacaprara - INFN Legnaro <stefano.lacaprara@pd.infn.it>; Riccardo Bellan - INFN TO <riccardo.bellan@cern.ch>

Definition at line 42 of file DTCombinatorialPatternReco.h.

Member Typedef Documentation

typedef std::pair<DTHitPairForFit*, DTEnums::DTCellSide> DTCombinatorialPatternReco::AssPoint [private]

Definition at line 71 of file DTCombinatorialPatternReco.h.

typedef boost::unordered_set<TriedPattern> DTCombinatorialPatternReco::TriedPatterns

Definition at line 145 of file DTCombinatorialPatternReco.h.

Constructor & Destructor Documentation

DTCombinatorialPatternReco::DTCombinatorialPatternReco ( const edm::ParameterSet & pset )

Constructor.

Definition at line 36 of file DTCombinatorialPatternReco.cc.

References debug, edm::ParameterSet::getParameter(), edm::ParameterSet::getUntrackedParameter(), theAlphaMaxPhi, theAlphaMaxTheta, theCleaner, theMaxAllowedHits, theUpdator, and usePairs.

                                                                                  : 
DTRecSegment2DBaseAlgo(pset), theAlgoName("DTCombinatorialPatternReco")
{
  theMaxAllowedHits = pset.getParameter<unsigned int>("MaxAllowedHits"); // 100
  theAlphaMaxTheta = pset.getParameter<double>("AlphaMaxTheta");// 0.1 ;
  theAlphaMaxPhi = pset.getParameter<double>("AlphaMaxPhi");// 1.0 ;
  debug = pset.getUntrackedParameter<bool>("debug"); //true;
  theUpdator = new DTSegmentUpdator(pset);
  theCleaner = new DTSegmentCleaner(pset);
  string theHitAlgoName = pset.getParameter<string>("recAlgo");
  usePairs = !(theHitAlgoName=="DTNoDriftAlgo");
}

DTCombinatorialPatternReco::~DTCombinatorialPatternReco ( ) [virtual]

Destructor.

Definition at line 50 of file DTCombinatorialPatternReco.cc.

References theCleaner, and theUpdator.

                                                        {
  delete theUpdator;
  delete theCleaner;
}

Member Function Documentation

virtual std::string DTCombinatorialPatternReco::algoName ( void ) const [inline, virtual]

return the algo name

Implements DTRecSegment2DBaseAlgo.

Definition at line 60 of file DTCombinatorialPatternReco.h.

References theAlgoName.

{ return theAlgoName; }

DTSegmentCand * DTCombinatorialPatternReco::buildBestSegment	(	std::vector< AssPoint > &	assHits,
		const DTSuperLayer *	sl
	)		`[private]`

Definition at line 318 of file DTCombinatorialPatternReco.cc.

References buildPointsCollection(), gather_cfg::cout, debug, and DTEnums::undefLR.

Referenced by buildSegments().

                                                                     {
  if (hits.size()<3) {
    //cout << "buildBestSegment: hits " << hits.size()<< endl;
    return 0; // a least 3 point
  }

  // hits with defined LR
  vector<AssPoint> points;

  // without: I store both L and R, a deque since I need front insertion and
  // deletion
  deque<DTHitPairForFit* > pointsNoLR; 

  // first add only the hits with LR assigned
  for (vector<AssPoint>::const_iterator hit=hits.begin();
       hit!=hits.end(); ++hit) {
    if ((*hit).second != DTEnums::undefLR) {
      points.push_back(*hit);
    } else { // then also for the undef'd one
      pointsNoLR.push_back((*hit).first);
    }
  }

  if(debug) {
    cout << "points " << points.size() << endl;
    cout << "pointsNoLR " << pointsNoLR.size() << endl;
  }

  // build all possible candidates using L/R ambiguity
  vector<DTSegmentCand*> candidates ;

  buildPointsCollection(points, pointsNoLR, candidates, sl);

  if(debug)
    cout << "candidates " << candidates.size() << endl;

  // so now I have build a given number of segments, I should find the best one,
  // by #hits and chi2.
  vector<DTSegmentCand*>::const_iterator bestCandIter = candidates.end();
  double minChi2=999999.;
  unsigned int maxNumHits=0;
  for (vector<DTSegmentCand*>::const_iterator iter=candidates.begin();
       iter!=candidates.end(); ++iter) {
    if ((*iter)->nHits()==maxNumHits && (*iter)->chi2()<minChi2) {
      minChi2=(*iter)->chi2();
      bestCandIter=iter;
    } else if ((*iter)->nHits()>maxNumHits) {
      maxNumHits=(*iter)->nHits();
      minChi2=(*iter)->chi2();
      bestCandIter=iter;
    }
  }

  // delete all candidates but the best one!
  for (vector<DTSegmentCand*>::iterator iter=candidates.begin();
       iter!=candidates.end(); ++iter) if (iter!=bestCandIter) delete *iter;

       // return the best candate if any
       if (bestCandIter != candidates.end()) {
         return (*bestCandIter);
       }
       return 0;
}

void DTCombinatorialPatternReco::buildPointsCollection	(	std::vector< AssPoint > &	points,
		std::deque< DTHitPairForFit * > &	pointsNoLR,
		std::vector< DTSegmentCand * > &	candidates,
		const DTSuperLayer *	sl
	)		`[private]`

build collection of compatible hits for L/R hits: the candidates is updated with the segment candidates found

Definition at line 376 of file DTCombinatorialExtendedPatternReco.cc.

References DTCombinatorialExtendedPatternReco::buildPointsCollection(), filterCSVwithJSON::copy, gather_cfg::cout, DTCombinatorialExtendedPatternReco::debug, DTSegmentUpdator::fit(), DTEnums::Left, DTEnums::Right, and DTCombinatorialExtendedPatternReco::theUpdator.

Referenced by buildBestSegment().

                                                                          {

  if(debug) {
    cout << "DTCombinatorialExtendedPatternReco::buildPointsCollection " << endl;
    cout << "points: " << points.size() << " NOLR: " << pointsNoLR.size()<< endl;
  }
  if (pointsNoLR.size()>0) { // still unassociated points!
    DTHitPairForFit* unassHit = pointsNoLR.front();
    // try with the right
    if(debug)
      cout << "Right hit" << endl;
    points.push_back(AssPoint(unassHit, DTEnums::Right));
    pointsNoLR.pop_front();
    buildPointsCollection(points, pointsNoLR, candidates, sl);
    pointsNoLR.push_front((unassHit));
    points.pop_back();

    // try with the left
    if(debug)
      cout << "Left hit" << endl;
    points.push_back(AssPoint(unassHit, DTEnums::Left));
    pointsNoLR.pop_front();
    buildPointsCollection(points, pointsNoLR, candidates, sl);
    pointsNoLR.push_front((unassHit));
    points.pop_back();
  } else { // all associated

    if(debug) {
      cout << "The Hits were" << endl;
      copy(points.begin(), points.end(),
           ostream_iterator<DTSegmentCand::AssPoint>(std::cout));
      cout << "----" << endl;
      cout << "All associated " << endl;
    }
    DTSegmentCand::AssPointCont pointsSet;

    // for (vector<AssPoint>::const_iterator point=points.begin();
    //      point!=points.end(); ++point) 
    pointsSet.insert(points.begin(),points.end());

    if(debug) {
      cout << "The Hits are" << endl;
      copy(pointsSet.begin(), pointsSet.end(),
           ostream_iterator<DTSegmentCand::AssPoint>(std::cout));
      cout << "----" << endl;
    }

    DTSegmentCand* newCand = new DTSegmentCand(pointsSet,sl);
    if (theUpdator->fit(newCand)) candidates.push_back(newCand);
    else delete newCand; // bad seg, too few hits
  }
}

vector< DTSegmentCand * > DTCombinatorialPatternReco::buildSegments	(	const DTSuperLayer *	sl,
		const std::vector< DTHitPairForFit * > &	hits
	)		`[private]`

get two hits in different layers and see if there are other / hits

Definition at line 106 of file DTCombinatorialPatternReco.cc.

References buildBestSegment(), checkDoubleCandidates(), DTSegmentCleaner::clean(), gather_cfg::cout, debug, findCompatibleHits(), DTSegmentCand::good(), DTSuperLayer::id(), DTEnums::Left, query::result, DTEnums::Right, theAlphaMaxPhi, theAlphaMaxTheta, theCleaner, theMaxAllowedHits, PV3DBase< T, PVType, FrameType >::theta(), theTriedPattern, GeomDet::toGlobal(), and csvLumiCalc::unit.

Referenced by DTMeantimerPatternReco4D::buildPhiSuperSegmentsCandidates(), and reconstruct().

                                                                                  {
  // clear the patterns tried
  if (debug) {
      cout << "theTriedPattern.size is " << theTriedPattern.size() << "\n";
  }
  theTriedPattern.clear();

  typedef vector<DTHitPairForFit*> hitCont;
  typedef hitCont::const_iterator  hitIter;
  vector<DTSegmentCand*> result;
  
  if(debug) {
    cout << "buildSegments: " << sl->id() << " nHits " << hits.size() << endl;
    for (vector<DTHitPairForFit*>::const_iterator hit=hits.begin();
         hit!=hits.end(); ++hit) cout << **hit<< endl;
  }

  // 10-Mar-2004 SL
  // put a protection against heavily populated chambers, for which the segment
  // building could lead to infinite memory usage...
  if (hits.size() > theMaxAllowedHits ) {
    if(debug) {
      cout << "Warning: this SuperLayer " << sl->id() << " has too many hits : "
        << hits.size() << " max allowed is " << theMaxAllowedHits << endl;
      cout << "Skipping segment reconstruction... " << endl;
    }
    return result;
  }

  //  compatible with them
  for (hitCont::const_iterator firstHit=hits.begin(); firstHit!=hits.end();
       ++firstHit) {
    for (hitCont::const_reverse_iterator lastHit=hits.rbegin(); 
         (*lastHit)!=(*firstHit); ++lastHit) {
      //if ( (*lastHit)->id().layerId() == (*firstHit)->id().layerId() ) continue; // hits must be in different layers!
      // hits must nor in the same nor in adiacent layers
      if ( fabs((*lastHit)->id().layerId()-(*firstHit)->id().layerId())<=1 ) continue;
      if(debug) {
        cout << "Selected these two hits pair " << endl;
        cout << "First " << *(*firstHit) << " Layer Id: " << (*firstHit)->id().layerId() << endl;
        cout << "Last "  << *(*lastHit)  << " Layer Id: " << (*lastHit)->id().layerId()  << endl;
      }

      GlobalPoint IP;
      float DAlphaMax;
      if ((sl->id()).superlayer()==2)  // Theta SL
        DAlphaMax=theAlphaMaxTheta;
      else // Phi SL
        DAlphaMax=theAlphaMaxPhi;

      DTEnums::DTCellSide codes[2]={DTEnums::Right, DTEnums::Left};
      for (int firstLR=0; firstLR<2; ++firstLR) {
        for (int lastLR=0; lastLR<2; ++lastLR) {
          // TODO move the global transformation in the DTHitPairForFit class
          // when it will be moved I will able to remove the sl from the input parameter
          GlobalPoint gposFirst=sl->toGlobal( (*firstHit)->localPosition(codes[firstLR]) );
          GlobalPoint gposLast= sl->toGlobal( (*lastHit)->localPosition(codes[lastLR]) );

          GlobalVector gvec=gposLast-gposFirst;
          GlobalVector gvecIP=gposLast-IP;

          // difference in angle measured
          float DAlpha=fabs(gvec.theta()-gvecIP.theta());

          // cout << "DAlpha " << DAlpha << endl;
          if (DAlpha<DAlphaMax) {

            // create a segment hypotesis
            // I don't need a true segment, just direction and position
            LocalPoint posIni = (*firstHit)->localPosition(codes[firstLR]);
            LocalVector dirIni = 
              ((*lastHit)->localPosition(codes[lastLR])-posIni).unit();

            // search for other compatible hits, with or without the L/R solved
            vector<AssPoint> assHits = findCompatibleHits(posIni, dirIni, hits);
            if(debug) 
              cout << "compatible hits " << assHits.size() << endl;

            // get the best segment with these hits: it's just one! 
            // (is it correct?)
            DTSegmentCand* seg = buildBestSegment(assHits, sl);

            if (seg) {
              if(debug) 
                cout << "segment " << *seg<< endl;

              // check if the chi2 and #hits are ok
              if (!seg->good()) {
                delete seg;
              } else { 

                // remove duplicated segments (I know, would be better to do it before the
                // fit...)
                if (checkDoubleCandidates(result,seg)) {
                  // add to the vector of hypotesis
                  result.push_back(seg);
                  if(debug) 
                    cout << "result is now " << result.size() << endl;
                } else { // delete it!
                  delete seg;
                  if(debug) 
                    cout << "already existing" << endl;
                }
              }
            }
          }
        }
      }
    }
  }
  if (debug) {
    for (vector<DTSegmentCand*>::const_iterator seg=result.begin();
         seg!=result.end(); ++seg) 
      cout << *(*seg) << endl;
  }

  // now I have a couple of segment hypotesis, should check for ghost
  result = theCleaner->clean(result);
  if (debug) {
    cout << "result no ghost  " << result.size() << endl;
    for (vector<DTSegmentCand*>::const_iterator seg=result.begin();
         seg!=result.end(); ++seg) 
      cout << *(*seg) << endl;
  }

  return result;
}

bool DTCombinatorialPatternReco::checkDoubleCandidates	(	std::vector< DTSegmentCand * > &	segs,
		DTSegmentCand *	seg
	)		`[private]`

Referenced by buildSegments().

vector< DTCombinatorialPatternReco::AssPoint > DTCombinatorialPatternReco::findCompatibleHits	(	const LocalPoint &	pos,
		const LocalVector &	dir,
		const std::vector< DTHitPairForFit * > &	hits
	)		`[private]`

Definition at line 240 of file DTCombinatorialExtendedPatternReco.cc.

References filterCSVwithJSON::copy, gather_cfg::cout, DTCombinatorialExtendedPatternReco::debug, spr::find(), DTEnums::Left, query::result, DTEnums::Right, matplotRender::t, DTCombinatorialExtendedPatternReco::theTriedPattern, DTEnums::undefLR, and DTCombinatorialExtendedPatternReco::usePairs.

Referenced by buildSegments().

                                                                                     {
  if (debug) cout << "Pos: " << posIni << " Dir: "<< dirIni << endl;
  vector<AssPoint> result;

  // counter to early-avoid double counting in hits pattern
  vector<int> tried;
  int nCompatibleHits=0;

  typedef vector<DTHitPairForFit*> hitCont;
  typedef hitCont::const_iterator  hitIter;
  for (hitIter hit=hits.begin(); hit!=hits.end(); ++hit) {
    pair<bool,bool> isCompatible = (*hit)->isCompatible(posIni, dirIni);
    if (debug) 
      cout << "isCompatible " << isCompatible.first << " " <<
        isCompatible.second << endl;

    // if only one of the two is compatible, then the LR is assigned,
    // otherwise is undefined

    DTEnums::DTCellSide lrcode;
    if (isCompatible.first && isCompatible.second) {
      usePairs ? lrcode=DTEnums::undefLR : lrcode=DTEnums::Left ; // if not usePairs then only use single side 
      tried.push_back(3);
      nCompatibleHits++;
    }
    else if (isCompatible.first) {
      lrcode=DTEnums::Left;
      tried.push_back(2);
      nCompatibleHits++;
    }
    else if (isCompatible.second) {
      lrcode=DTEnums::Right;
      tried.push_back(1);
      nCompatibleHits++;
    }
    else {
      tried.push_back(0);
      continue; // neither is compatible
    }
    result.push_back(AssPoint(*hit, lrcode));
  }
  

  // check if too few associated hits or pattern already tried
  if ( nCompatibleHits < 3 || find(theTriedPattern.begin(), theTriedPattern.end(),tried) == theTriedPattern.end()) {
    theTriedPattern.push_back(tried);
  } else {
    if (debug) {
      vector<vector<int> >::const_iterator t=find(theTriedPattern.begin(),
                                                  theTriedPattern.end(),
                                                  tried);
      cout << "Already tried";
      copy((*t).begin(), (*t).end(), ostream_iterator<int>(std::cout));
      cout << endl;
    }
    // empty the result vector
    result.clear();
  }
  return result;
}

vector< DTHitPairForFit * > DTCombinatorialPatternReco::initHits	(	const DTSuperLayer *	sl,
		const std::vector< DTRecHit1DPair > &	hits
	)		`[private]`

Definition at line 94 of file DTCombinatorialPatternReco.cc.

References query::result, and theDTGeometry.

Referenced by DTMeantimerPatternReco4D::buildPhiSuperSegmentsCandidates(), and reconstruct().

                                                                           {  
  
  vector<DTHitPairForFit*> result;
  for (vector<DTRecHit1DPair>::const_iterator hit=hits.begin();
       hit!=hits.end(); ++hit) {
    result.push_back(new DTHitPairForFit(*hit, *sl, theDTGeometry));
  }
  return result;
}

edm::OwnVector< DTSLRecSegment2D > DTCombinatorialPatternReco::reconstruct	(	const DTSuperLayer *	sl,
		const std::vector< DTRecHit1DPair > &	hits
	)		`[virtual]`

this function is called in the producer

Implements DTRecSegment2DBaseAlgo.

Definition at line 57 of file DTCombinatorialPatternReco.cc.

References edm::OwnVector< T, P >::back(), buildSegments(), gather_cfg::cout, debug, initHits(), edm::OwnVector< T, P >::push_back(), query::result, theUpdator, and DTSegmentUpdator::update().

Referenced by DTCombinatorialPatternReco4D::reconstruct().

                                                                               {

  edm::OwnVector<DTSLRecSegment2D> result;
  vector<DTHitPairForFit*> hitsForFit = initHits(sl, pairs);

  vector<DTSegmentCand*> candidates = buildSegments(sl, hitsForFit);

  vector<DTSegmentCand*>::const_iterator cand=candidates.begin();
  while (cand<candidates.end()) {
    
    DTSLRecSegment2D *segment = (**cand);

    theUpdator->update(segment);

    result.push_back(segment);

    if (debug) {
      cout<<"Reconstructed 2D segments "<< result.back() <<endl;
    }

    delete *(cand++); // delete the candidate!
  }

  for (vector<DTHitPairForFit*>::iterator it = hitsForFit.begin(), ed = hitsForFit.end(); 
        it != ed; ++it) delete *it;

  return result;
}

void DTCombinatorialPatternReco::setES ( const edm::EventSetup & setup ) [virtual]

Through this function the EventSetup is percolated to the objs which request it

Implements DTRecSegment2DBaseAlgo.

Definition at line 87 of file DTCombinatorialPatternReco.cc.

References edm::EventSetup::get(), DTSegmentUpdator::setES(), theDTGeometry, and theUpdator.

Referenced by DTCombinatorialPatternReco4D::setES().

                                                                {
  // Get the DT Geometry
  setup.get<MuonGeometryRecord>().get(theDTGeometry);
  theUpdator->setES(setup);
}