[u/mrichter/AliRoot.git] / TPC / AliTPCclusterer.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/*
$Log$
Revision 1.2  2000/06/30 12:07:50  kowal2
Updated from the TPC-PreRelease branch

Revision 1.1.2.1  2000/06/25 08:53:55  kowal2
Splitted from AliTPCtracking

*/

//-------------------------------------------------------
//          Implementation of the TPC clusterer
//
//   Origin: Jouri Belikov, CERN, Jouri.Belikov@cern.ch 
//-------------------------------------------------------

#include "AliTPCclusterer.h"
#include "AliTPCcluster.h"
#include <TObjArray.h>
#include <TFile.h>
#include "AliTPCClustersArray.h"
#include "AliTPCClustersRow.h"
#include "AliDigits.h"
#include "AliSimDigits.h"
#include "AliTPCParam.h"
#include <iostream.h>
#include <TTree.h>

void AliTPCclusterer::FindPeaks(Int_t k,Int_t max,
AliBin *b,Int_t *idx,UInt_t *msk,Int_t& n) {
  //find local maxima
  if (n<31)
  if (IsMaximum(k,max,b)) {
    idx[n]=k; msk[n]=(2<<n);
    n++;
  }
  b[k].SetMask(0);
  if (b[k-max].GetMask()&1) FindPeaks(k-max,max,b,idx,msk,n);
  if (b[k-1  ].GetMask()&1) FindPeaks(k-1  ,max,b,idx,msk,n);
  if (b[k+max].GetMask()&1) FindPeaks(k+max,max,b,idx,msk,n);
  if (b[k+1  ].GetMask()&1) FindPeaks(k+1  ,max,b,idx,msk,n);
}

void AliTPCclusterer::MarkPeak(Int_t k, Int_t max, AliBin *bins, UInt_t m) {
  //mark this peak
  UShort_t q=bins[k].GetQ();

  bins[k].SetMask(bins[k].GetMask()|m); 

  if (bins[k-max].GetQ() <= q)
     if ((bins[k-max].GetMask()&m) == 0) MarkPeak(k-max,max,bins,m);
  if (bins[k-1  ].GetQ() <= q)
     if ((bins[k-1  ].GetMask()&m) == 0) MarkPeak(k-1  ,max,bins,m);
  if (bins[k+max].GetQ() <= q)
     if ((bins[k+max].GetMask()&m) == 0) MarkPeak(k+max,max,bins,m);
  if (bins[k+1  ].GetQ() <= q)
     if ((bins[k+1  ].GetMask()&m) == 0) MarkPeak(k+1  ,max,bins,m);
}

void AliTPCclusterer::MakeCluster(Int_t k,Int_t max,AliBin *bins,UInt_t m,
AliTPCcluster &c) {
  //make cluster using digits of this peak
  Float_t q=(Float_t)bins[k].GetQ();
  Int_t i=k/max, j=k-i*max;

  c.SetQ(c.GetQ()+q);
  c.SetY(c.GetY()+i*q); 
  c.SetZ(c.GetZ()+j*q); 
  c.SetSigmaY2(c.GetSigmaY2()+i*i*q);
  c.SetSigmaZ2(c.GetSigmaZ2()+j*j*q);

  bins[k].SetMask(0xFFFFFFFE);
  
  if (bins[k-max].GetMask() == m) MakeCluster(k-max,max,bins,m,c);
  if (bins[k-1  ].GetMask() == m) MakeCluster(k-1  ,max,bins,m,c);
  if (bins[k+max].GetMask() == m) MakeCluster(k+max,max,bins,m,c);
  if (bins[k+1  ].GetMask() == m) MakeCluster(k+1  ,max,bins,m,c);
}

//_____________________________________________________________________________
void AliTPCclusterer::Digits2Clusters(const AliTPCParam *par, TFile *of)
{
  //-----------------------------------------------------------------
  // This is a simple cluster finder.
  //-----------------------------------------------------------------
  TDirectory *savedir=gDirectory; 

  if (!of->IsOpen()) {
     cerr<<"AliTPC::Digits2Clusters(): output file not open !\n";
     return;
  }

  const Int_t kMAXZ=par->GetMaxTBin()+2;

  TTree *t = (TTree *)gDirectory->Get("TreeD_75x40_100x60");
  AliSimDigits digarr, *dummy=&digarr;
  t->GetBranch("Segment")->SetAddress(&dummy);
  Stat_t nentries = t->GetEntries();

  of->cd();

  ((AliTPCParam*)par)->Write(par->GetTitle());
  AliTPCClustersArray carray;
  carray.Setup(par);
  carray.SetClusterType("AliTPCcluster");
  carray.MakeTree();

  Int_t nclusters=0;

  for (Int_t n=0; n<nentries; n++) {
    t->GetEvent(n);
    Int_t sec, row;
    if (!par->AdjustSectorRow(digarr.GetID(),sec,row)) {
       cerr<<"AliTPC warning: invalid segment ID ! "<<digarr.GetID()<<endl;
       continue;
    }

    AliTPCClustersRow *clrow=carray.CreateRow(sec,row);

    Float_t rx=par->GetPadRowRadii(sec,row);

    Int_t npads, sign;
    {
       const Int_t kNIS=par->GetNInnerSector(), kNOS=par->GetNOuterSector();
       if (sec < kNIS) {
          npads = par->GetNPadsLow(row);
          sign = (sec < kNIS/2) ? 1 : -1;
       } else {
          npads = par->GetNPadsUp(row);
          sign = ((sec-kNIS) < kNOS/2) ? 1 : -1;
       }
    }

    const Int_t kMAXBIN=kMAXZ*(npads+2);
    AliBin *bins=new AliBin[kMAXBIN];
    for (Int_t ii=0;ii<kMAXBIN;ii++) {
       bins[ii].SetQ(0); bins[ii].SetMask(0xFFFFFFFE);
    }

    digarr.First();
    do {
       Short_t dig=digarr.CurrentDigit();
       if (dig<=par->GetZeroSup()) continue;
       Int_t j=digarr.CurrentRow()+1, i=digarr.CurrentColumn()+1;
       bins[i*kMAXZ+j].SetQ(dig);
       bins[i*kMAXZ+j].SetMask(1);
    } while (digarr.Next());

    Int_t ncl=0;
    for (Int_t i=0; i<kMAXBIN; i++) {
      if ((bins[i].GetMask()&1) == 0) continue;
      Int_t idx[32]; UInt_t msk[32]; Int_t npeaks=0;
      FindPeaks(i, kMAXZ, bins, idx, msk, npeaks);

      if (npeaks>30) continue;

      Int_t k,l;
      for (k=0; k<npeaks-1; k++){//mark adjacent peaks
        if (idx[k] < 0) continue; //this peak is already removed
        for (l=k+1; l<npeaks; l++) {
           if (idx[l] < 0) continue; //this peak is already removed
           Int_t ki=idx[k]/kMAXZ, kj=idx[k] - ki*kMAXZ;
           Int_t li=idx[l]/kMAXZ, lj=idx[l] - li*kMAXZ;
           Int_t di=TMath::Abs(ki - li);
           Int_t dj=TMath::Abs(kj - lj);
           if (di>1 || dj>1) continue;
           if (bins[idx[k]].GetQ() > bins[idx[l]].GetQ()) {
              msk[l]=msk[k];
              idx[l]*=-1;
           } else {
              msk[k]=msk[l];
              idx[k]*=-1;
              break;
           } 
        }
      }

      for (k=0; k<npeaks; k++) {
        MarkPeak(TMath::Abs(idx[k]), kMAXZ, bins, msk[k]);
      }
        
      for (k=0; k<npeaks; k++) {
         if (idx[k] < 0) continue; //removed peak
         AliTPCcluster c;
         MakeCluster(idx[k], kMAXZ, bins, msk[k], c);
         if (c.GetQ() < 5) continue; //noise cluster
         c.SetY(c.GetY()/c.GetQ());
         c.SetZ(c.GetZ()/c.GetQ());

         Float_t s2 = c.GetSigmaY2()/c.GetQ() - c.GetY()*c.GetY();
         Float_t w=par->GetPadPitchWidth(sec);
         c.SetSigmaY2((s2 + 1./12.)*w*w);
         if (s2 != 0.) {
	   c.SetSigmaY2(c.GetSigmaY2()*0.108);
	   if (sec<par->GetNInnerSector()) c.SetSigmaY2(c.GetSigmaY2()*2.07);
         }

         s2 = c.GetSigmaZ2()/c.GetQ() - c.GetZ()*c.GetZ();
         w=par->GetZWidth();
         c.SetSigmaZ2((s2 + 1./12.)*w*w);
         if (s2 != 0.) {
	   c.SetSigmaZ2(c.GetSigmaZ2()*0.169);
	   if (sec<par->GetNInnerSector()) c.SetSigmaZ2(c.GetSigmaZ2()*1.77);
         }

         c.SetY((c.GetY() - 0.5 - 0.5*npads)*par->GetPadPitchWidth(sec));
         c.SetZ(par->GetZWidth()*(c.GetZ()-1)); 
         c.SetZ(c.GetZ() - 3.*par->GetZSigma()); // PASA delay 
         c.SetZ(sign*(par->GetZLength() - c.GetZ()));

         if (rx<230./250.*TMath::Abs(c.GetZ())) continue;

         Int_t ki=idx[k]/kMAXZ, kj=idx[k] - ki*kMAXZ;
         c.SetLabel(digarr.GetTrackID(kj-1,ki-1,0),0);
         c.SetLabel(digarr.GetTrackID(kj-1,ki-1,1),1);
         c.SetLabel(digarr.GetTrackID(kj-1,ki-1,2),2);

         c.SetQ(bins[idx[k]].GetQ());

         if (ki==1 || ki==npads || kj==1 || kj==kMAXZ-2) {
           c.SetSigmaY2(c.GetSigmaY2()*25.);
           c.SetSigmaZ2(c.GetSigmaZ2()*4.);
         }
         clrow->InsertCluster(&c); ncl++;
      }
    }
    carray.StoreRow(sec,row);
    carray.ClearRow(sec,row);

    cerr<<"sector, row, compressed digits, clusters: "
    <<sec<<' '<<row<<' '<<digarr.GetSize()<<' '<<ncl<<"                  \r";

    nclusters+=ncl;

    delete[] bins;  
  }

  cerr<<"Number of found clusters : "<<nclusters<<"                        \n";

  carray.GetTree()->Write();
  savedir->cd();
}
Commit	Line	Data
73042f01	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	/*
	17	$Log$
c3c63118	18	Revision 1.2 2000/06/30 12:07:50 kowal2
	19	Updated from the TPC-PreRelease branch
	20
73042f01	21	Revision 1.1.2.1 2000/06/25 08:53:55 kowal2
	22	Splitted from AliTPCtracking
	23
	24	*/
	25
	26	//-------------------------------------------------------
	27	// Implementation of the TPC clusterer
	28	//
	29	// Origin: Jouri Belikov, CERN, Jouri.Belikov@cern.ch
	30	//-------------------------------------------------------
	31
	32	#include "AliTPCclusterer.h"
	33	#include "AliTPCcluster.h"
	34	#include <TObjArray.h>
	35	#include <TFile.h>
	36	#include "AliTPCClustersArray.h"
	37	#include "AliTPCClustersRow.h"
	38	#include "AliDigits.h"
	39	#include "AliSimDigits.h"
	40	#include "AliTPCParam.h"
	41	#include <iostream.h>
c3c63118	42	#include <TTree.h>
73042f01	43
	44	void AliTPCclusterer::FindPeaks(Int_t k,Int_t max,
	45	AliBin b,Int_t idx,UInt_t *msk,Int_t& n) {
	46	//find local maxima
	47	if (n<31)
	48	if (IsMaximum(k,max,b)) {
	49	idx[n]=k; msk[n]=(2<<n);
	50	n++;
	51	}
	52	b[k].SetMask(0);
	53	if (b[k-max].GetMask()&1) FindPeaks(k-max,max,b,idx,msk,n);
	54	if (b[k-1 ].GetMask()&1) FindPeaks(k-1 ,max,b,idx,msk,n);
	55	if (b[k+max].GetMask()&1) FindPeaks(k+max,max,b,idx,msk,n);
	56	if (b[k+1 ].GetMask()&1) FindPeaks(k+1 ,max,b,idx,msk,n);
	57	}
	58
	59	void AliTPCclusterer::MarkPeak(Int_t k, Int_t max, AliBin *bins, UInt_t m) {
	60	//mark this peak
	61	UShort_t q=bins[k].GetQ();
	62
	63	bins[k].SetMask(bins[k].GetMask()\|m);
	64
	65	if (bins[k-max].GetQ() <= q)
	66	if ((bins[k-max].GetMask()&m) == 0) MarkPeak(k-max,max,bins,m);
	67	if (bins[k-1 ].GetQ() <= q)
	68	if ((bins[k-1 ].GetMask()&m) == 0) MarkPeak(k-1 ,max,bins,m);
	69	if (bins[k+max].GetQ() <= q)
	70	if ((bins[k+max].GetMask()&m) == 0) MarkPeak(k+max,max,bins,m);
	71	if (bins[k+1 ].GetQ() <= q)
	72	if ((bins[k+1 ].GetMask()&m) == 0) MarkPeak(k+1 ,max,bins,m);
	73	}
	74
	75	void AliTPCclusterer::MakeCluster(Int_t k,Int_t max,AliBin *bins,UInt_t m,
	76	AliTPCcluster &c) {
	77	//make cluster using digits of this peak
	78	Float_t q=(Float_t)bins[k].GetQ();
	79	Int_t i=k/max, j=k-i*max;
	80
	81	c.SetQ(c.GetQ()+q);
	82	c.SetY(c.GetY()+i*q);
	83	c.SetZ(c.GetZ()+j*q);
	84	c.SetSigmaY2(c.GetSigmaY2()+iiq);
	85	c.SetSigmaZ2(c.GetSigmaZ2()+jjq);
	86
	87	bins[k].SetMask(0xFFFFFFFE);
	88
	89	if (bins[k-max].GetMask() == m) MakeCluster(k-max,max,bins,m,c);
	90	if (bins[k-1 ].GetMask() == m) MakeCluster(k-1 ,max,bins,m,c);
	91	if (bins[k+max].GetMask() == m) MakeCluster(k+max,max,bins,m,c);
	92	if (bins[k+1 ].GetMask() == m) MakeCluster(k+1 ,max,bins,m,c);
	93	}
	94
	95	//_____________________________________________________________________________
	96	void AliTPCclusterer::Digits2Clusters(const AliTPCParam par, TFile of)
	97	{
	98	//-----------------------------------------------------------------
	99	// This is a simple cluster finder.
	100	//-----------------------------------------------------------------
	101	TDirectory *savedir=gDirectory;
	102
	103	if (!of->IsOpen()) {
	104	cerr<<"AliTPC::Digits2Clusters(): output file not open !\n";
	105	return;
	106	}
107
108	const Int_t kMAXZ=par->GetMaxTBin()+2;
109
110	TTree t = (TTree )gDirectory->Get("TreeD_75x40_100x60");
111	AliSimDigits digarr, *dummy=&digarr;
112	t->GetBranch("Segment")->SetAddress(&dummy);
113	Stat_t nentries = t->GetEntries();
114
115	of->cd();
116
117	((AliTPCParam*)par)->Write(par->GetTitle());
118	AliTPCClustersArray carray;
119	carray.Setup(par);
120	carray.SetClusterType("AliTPCcluster");
121	carray.MakeTree();
122
123	Int_t nclusters=0;
124
125	for (Int_t n=0; n<nentries; n++) {
126	t->GetEvent(n);
127	Int_t sec, row;
128	if (!par->AdjustSectorRow(digarr.GetID(),sec,row)) {
129	cerr<<"AliTPC warning: invalid segment ID ! "<<digarr.GetID()<<endl;
130	continue;
131	}
132
133	AliTPCClustersRow *clrow=carray.CreateRow(sec,row);
134
135	Float_t rx=par->GetPadRowRadii(sec,row);
136
137	Int_t npads, sign;
138	{
139	const Int_t kNIS=par->GetNInnerSector(), kNOS=par->GetNOuterSector();
140	if (sec < kNIS) {
141	npads = par->GetNPadsLow(row);
142	sign = (sec < kNIS/2) ? 1 : -1;
143	} else {
144	npads = par->GetNPadsUp(row);
145	sign = ((sec-kNIS) < kNOS/2) ? 1 : -1;
146	}
147	}
148
149	const Int_t kMAXBIN=kMAXZ*(npads+2);
150	AliBin *bins=new AliBin[kMAXBIN];
151	for (Int_t ii=0;ii<kMAXBIN;ii++) {
152	bins[ii].SetQ(0); bins[ii].SetMask(0xFFFFFFFE);
153	}
154
155	digarr.First();
156	do {
157	Short_t dig=digarr.CurrentDigit();
158	if (dig<=par->GetZeroSup()) continue;
159	Int_t j=digarr.CurrentRow()+1, i=digarr.CurrentColumn()+1;
160	bins[i*kMAXZ+j].SetQ(dig);
161	bins[i*kMAXZ+j].SetMask(1);
162	} while (digarr.Next());
163
164	Int_t ncl=0;
165	for (Int_t i=0; i<kMAXBIN; i++) {
166	if ((bins[i].GetMask()&1) == 0) continue;
167	Int_t idx[32]; UInt_t msk[32]; Int_t npeaks=0;
168	FindPeaks(i, kMAXZ, bins, idx, msk, npeaks);
169
170	if (npeaks>30) continue;
171
172	Int_t k,l;
173	for (k=0; k<npeaks-1; k++){//mark adjacent peaks
174	if (idx[k] < 0) continue; //this peak is already removed
175	for (l=k+1; l<npeaks; l++) {
176	if (idx[l] < 0) continue; //this peak is already removed
177	Int_t ki=idx[k]/kMAXZ, kj=idx[k] - ki*kMAXZ;
178	Int_t li=idx[l]/kMAXZ, lj=idx[l] - li*kMAXZ;
179	Int_t di=TMath::Abs(ki - li);
180	Int_t dj=TMath::Abs(kj - lj);
181	if (di>1 \|\| dj>1) continue;
182	if (bins[idx[k]].GetQ() > bins[idx[l]].GetQ()) {
183	msk[l]=msk[k];
184	idx[l]*=-1;
185	} else {
186	msk[k]=msk[l];
187	idx[k]*=-1;
188	break;
189	}
190	}
191	}
192
193	for (k=0; k<npeaks; k++) {
194	MarkPeak(TMath::Abs(idx[k]), kMAXZ, bins, msk[k]);
195	}
196
197	for (k=0; k<npeaks; k++) {
198	if (idx[k] < 0) continue; //removed peak
199	AliTPCcluster c;
200	MakeCluster(idx[k], kMAXZ, bins, msk[k], c);
201	if (c.GetQ() < 5) continue; //noise cluster
202	c.SetY(c.GetY()/c.GetQ());
203	c.SetZ(c.GetZ()/c.GetQ());
204
205	Float_t s2 = c.GetSigmaY2()/c.GetQ() - c.GetY()*c.GetY();
206	Float_t w=par->GetPadPitchWidth(sec);
207	c.SetSigmaY2((s2 + 1./12.)ww);
208	if (s2 != 0.) {
209	c.SetSigmaY2(c.GetSigmaY2()*0.108);
210	if (sec<par->GetNInnerSector()) c.SetSigmaY2(c.GetSigmaY2()*2.07);
211	}
212
213	s2 = c.GetSigmaZ2()/c.GetQ() - c.GetZ()*c.GetZ();
214	w=par->GetZWidth();
215	c.SetSigmaZ2((s2 + 1./12.)ww);
216	if (s2 != 0.) {
217	c.SetSigmaZ2(c.GetSigmaZ2()*0.169);
218	if (sec<par->GetNInnerSector()) c.SetSigmaZ2(c.GetSigmaZ2()*1.77);
219	}
220
221	c.SetY((c.GetY() - 0.5 - 0.5npads)par->GetPadPitchWidth(sec));
222	c.SetZ(par->GetZWidth()*(c.GetZ()-1));
223	c.SetZ(c.GetZ() - 3.*par->GetZSigma()); // PASA delay
224	c.SetZ(sign*(par->GetZLength() - c.GetZ()));
225
226	if (rx<230./250.*TMath::Abs(c.GetZ())) continue;
227
228	Int_t ki=idx[k]/kMAXZ, kj=idx[k] - ki*kMAXZ;
229	c.SetLabel(digarr.GetTrackID(kj-1,ki-1,0),0);
230	c.SetLabel(digarr.GetTrackID(kj-1,ki-1,1),1);
231	c.SetLabel(digarr.GetTrackID(kj-1,ki-1,2),2);
232
233	c.SetQ(bins[idx[k]].GetQ());
234
235	if (ki==1 \|\| ki==npads \|\| kj==1 \|\| kj==kMAXZ-2) {
236	c.SetSigmaY2(c.GetSigmaY2()*25.);
237	c.SetSigmaZ2(c.GetSigmaZ2()*4.);
238	}
239	clrow->InsertCluster(&c); ncl++;
240	}
241	}
242	carray.StoreRow(sec,row);
243	carray.ClearRow(sec,row);
244
245	cerr<<"sector, row, compressed digits, clusters: "
246	<<sec<<' '<<row<<' '<<digarr.GetSize()<<' '<<ncl<<" \r";
247
248	nclusters+=ncl;
249
250	delete[] bins;
251	}
252
253	cerr<<"Number of found clusters : "<<nclusters<<" \n";
254
255	carray.GetTree()->Write();
256	savedir->cd();
257	}
258