1 #ifndef ALIMUONCLUSTERFINDERMLEM_H
2 #define ALIMUONCLUSTERFINDERMLEM_H
3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
9 /// \class AliMUONClusterFinderMLEM
10 /// \brief Cluster finder in MUON arm of ALICE
12 // Author Alexander Zinchenko, JINR Dubna; Laurent Aphecetche, SUBATECH
19 #ifndef ROOT_TObjArray
20 # include "TObjArray.h"
23 # include "TVector2.h"
28 #include "AliMUONVClusterFinder.h"
30 class AliMUONClusterSplitterMLEM;
32 class AliMUONClusterFinderMLEM : public AliMUONVClusterFinder
35 AliMUONClusterFinderMLEM(Bool_t plot, AliMUONVClusterFinder* clusterFinder); // Constructor
36 virtual ~AliMUONClusterFinderMLEM(); // Destructor
38 virtual Bool_t NeedSegmentation() const { return kTRUE; }
40 using AliMUONVClusterFinder::Prepare;
42 virtual Bool_t Prepare(Int_t detElemId,
43 TClonesArray* pads[2],
44 const AliMpArea& area,
45 const AliMpVSegmentation* segmentations[2]);
47 virtual AliMUONCluster* NextCluster();
49 virtual void Print(Option_t* opt="") const;
51 virtual void Paint(Option_t* opt="");
53 // Status flags for pads
55 /// Return pad "basic" state flag
56 static Int_t GetZeroFlag() { return fgkZero; }
57 /// Return do not kill flag
58 static Int_t GetMustKeepFlag() { return fgkMustKeep; }
59 /// Return should be used for fit flag
60 static Int_t GetUseForFitFlag() { return fgkUseForFit; }
61 /// Return processing is over flag
62 static Int_t GetOverFlag() { return fgkOver; }
63 /// Return modified pad charge flag
64 static Int_t GetModifiedFlag() { return fgkModified; }
65 /// Return coupled pad flag
66 static Int_t GetCoupledFlag() { return fgkCoupled; }
70 AliMUONClusterFinderMLEM(const AliMUONClusterFinderMLEM& rhs);
72 AliMUONClusterFinderMLEM& operator=(const AliMUONClusterFinderMLEM& rhs);
74 Bool_t WorkOnPreCluster();
76 /// Check precluster to simplify it (if possible), and return the simplified cluster
77 AliMUONCluster* CheckPrecluster(const AliMUONCluster& cluster);
78 AliMUONCluster* CheckPreclusterTwoCathodes(AliMUONCluster* cluster);
80 /// Checks whether a pad and a pixel have an overlapping area.
81 Bool_t Overlap(const AliMUONPad& pad, const AliMUONPad& pixel);
83 /// build array of pixels
84 void BuildPixArray(AliMUONCluster& cluster);
85 void BuildPixArrayOneCathode(AliMUONCluster& cluster);
86 void PadOverHist(Int_t idir, Int_t ix0, Int_t iy0, AliMUONPad *pad,
87 TH2D *hist1, TH2D *hist2);
89 void RemovePixel(Int_t i);
91 AliMUONPad* Pixel(Int_t i) const;
93 Bool_t MainLoop(AliMUONCluster& cluster, Int_t iSimple); // repeat MLEM algorithm until pixels become sufficiently small
95 void Mlem(AliMUONCluster& cluster, const Double_t *coef, Double_t *probi, Int_t nIter); // use MLEM for cluster finding
97 void FindCOG(Double_t *xyc); // find COG position around maximum bin
98 Int_t FindNearest(const AliMUONPad *pixPtr0); // find nearest neighbouring pixel to the given one
100 Int_t FindLocalMaxima(TObjArray *pixArray, Int_t *localMax, Double_t *maxVal); // find local maxima
101 void FlagLocalMax(TH2D *hist, Int_t i, Int_t j, Int_t *isLocalMax); // flag local max
102 void FindCluster(AliMUONCluster& cluster, const Int_t *localMax, Int_t iMax); // find cluster around local max
103 void AddVirtualPad(AliMUONCluster& cluster); // add virtual pads for some clusters (if necessary)
105 void PadsInXandY(AliMUONCluster& cluster, Int_t &nInX, Int_t &nInY) const; // get number of pads in X and Y
107 /// Process simple cluster
108 void Simple(AliMUONCluster& cluster);
110 void Plot(const char* outputfile);
112 void ComputeCoefficients(AliMUONCluster& cluster,
113 Double_t* coef, Double_t* probi);
115 void CheckOverlaps();
116 void AddBinSimple(TH2D *mlem, Int_t ic, Int_t jc);
117 void MaskPeaks(Int_t mask);
120 // Status flags for pads
121 static const Int_t fgkZero; ///< pad "basic" state
122 static const Int_t fgkMustKeep; ///< do not kill (for pixels)
123 static const Int_t fgkUseForFit; ///< should be used for fit
124 static const Int_t fgkOver; ///< processing is over
125 static const Int_t fgkModified; ///< modified pad charge
126 static const Int_t fgkCoupled; ///< coupled pad
129 static const Double_t fgkZeroSuppression; ///< average zero suppression value
130 static const Double_t fgkDistancePrecision; ///< used to check overlaps and so on
131 static const TVector2 fgkIncreaseSize; ///< idem
132 static const TVector2 fgkDecreaseSize; ///< idem
134 AliMUONVClusterFinder* fPreClusterFinder; //!< the pre-clustering worker
135 AliMUONCluster* fPreCluster; //!< current pre-cluster
136 TObjArray fClusterList; //!< clusters corresponding to the current pre-cluster
138 Int_t fEventNumber; //!< current event being processed
139 Int_t fDetElemId; //!< current DE being processed
140 Int_t fClusterNumber; //!< current cluster number
142 const AliMpVSegmentation *fkSegmentation[2]; //!< new segmentation
144 //Int_t fCathBeg; //!< starting cathode (for combined cluster / track reco)
145 //Int_t fPadBeg[2]; //!< starting pads (for combined cluster / track reco)
147 //static TMinuit* fgMinuit; //!< Fitter
148 TH2D *fHistMlem; //!< histogram for MLEM procedure
149 TH2D *fHistAnode; //!< histogram for local maxima search
151 TObjArray* fPixArray; //!< collection of pixels
152 Int_t fDebug; //!< debug level
153 Bool_t fPlot; //!< whether we should plot thing (for debug only, quite slow!)
155 AliMUONClusterSplitterMLEM* fSplitter; //!< helper class to go from pixel arrays to clusters
156 Int_t fNClusters; //!< total number of clusters
157 Int_t fNAddVirtualPads; //!< number of clusters for which we added virtual pads
159 ClassDef(AliMUONClusterFinderMLEM,0) // cluster finder in MUON arm of ALICE