3 // Author: Constantin Loizides <mailto:loizides@ikf.uni-frankfurt.de>
4 //*-- Copyright & copy CL
6 #include "AliL3StandardIncludes.h"
8 #include "AliL3Logging.h"
9 #include "AliL3HoughTransformerLUT.h"
10 #include "AliL3Transform.h"
11 #include "AliL3MemHandler.h"
12 #include "AliL3DigitData.h"
13 #include "AliL3Histogram.h"
19 //_____________________________________________________________
20 // AliL3HoughTransformerLUT
22 // Hough transformation class using Look-UP-Tables
25 ClassImp(AliL3HoughTransformerLUT)
27 AliL3HoughTransformerLUT::AliL3HoughTransformerLUT() : AliL3HoughBaseTransformer()
52 AliL3HoughTransformerLUT::AliL3HoughTransformerLUT(Int_t slice,Int_t patch,Int_t n_eta_segments) : AliL3HoughBaseTransformer(slice,patch,n_eta_segments)
75 Init(slice,patch,n_eta_segments);
78 AliL3HoughTransformerLUT::~AliL3HoughTransformerLUT()
85 for(Int_t i=0; i<fNEtas; i++)
87 if(!fTrackID[i]) continue;
106 void AliL3HoughTransformerLUT::DeleteHistograms()
109 delete[] fLUT2sinphi0;
110 delete[] fLUT2cosphi0;
119 for(Int_t i=0; i<fNEtas; i++)
121 if(!fParamSpace[i]) continue;
122 delete fParamSpace[i];
124 delete [] fParamSpace;
128 void AliL3HoughTransformerLUT::Init(Int_t slice,Int_t patch,Int_t n_eta_segments)
130 AliL3HoughBaseTransformer::Init(slice,patch,n_eta_segments);
132 //delete old LUT tables
144 fMinRow=AliL3Transform::GetFirstRow(patch);;
145 fMaxRow=AliL3Transform::GetLastRow(patch);;
146 fNRows=AliL3Transform::GetNRows(patch);;
147 fNEtas=n_eta_segments;
148 if(fNEtas!=GetNEtaSegments()) {
149 cerr << "AliL3HoughTransformerLUT::Init -> Error: Number of Etas must be equal!" << endl;
153 AliL3Transform::Slice2Sector(slice,fMinRow,fSector,fSectorRow);
154 fZSign = slice < 18 ? 1:-1;
156 fZLengthPlusOff=AliL3Transform::GetZLength()+AliL3Transform::GetZOffset();
157 fTimeWidth=AliL3Transform::GetZWidth();
160 if(fSector<AliL3Transform::GetNSectorLow())
161 fPadPitch=AliL3Transform::GetPadPitchWidthLow();
163 fPadPitch=AliL3Transform::GetPadPitchWidthUp();
165 Float_t etamax_=GetEtaMax();
166 Float_t etamin_=GetEtaMin();
167 fEtaSlice=(etamax_-etamin_)/n_eta_segments;
169 //lookup tables for X and Y
170 fLUTX=new Float_t[fNRows];
171 fLUTY=new Float_t[fNRows];
172 for(Int_t rr=0;rr<fNRows;rr++){
173 fLUTX[rr]=Float_t(AliL3Transform::Row2X(rr+fMinRow));
174 fLUTY[rr]=Float_t(0.5*(AliL3Transform::GetNPads(rr+fMinRow)-1)*fPadPitch);
175 //cout << rr << ": " << (Float_t)fLUTX[rr] << " " << (Float_t)fLUTY[rr] << endl;
178 //lookup tables for rz2s <=> etas
179 fLUTEta=new Float_t[fNEtas];
180 for(Int_t rr=0;rr<fNEtas;rr++){
181 Float_t eta=etamin_+(rr+1)*fEtaSlice;
182 fLUTEta[rr]=CalcRoverZ2(eta);
183 //cout << rr << ": " << eta << " " << fLUTEta[rr] << " " << GetEta(rr,fSlice) << endl;
187 void AliL3HoughTransformerLUT::CreateHistograms(Int_t nxbin,Double_t pt_min,Int_t nybin,Double_t phimin,Double_t phimax)
189 //Create the histograms (parameter space).
190 //These are 2D histograms, span by kappa (curvature of track) and phi0 (emission angle with x-axis).
191 //The arguments give the range and binning;
192 //nxbin = #bins in kappa
193 //nybin = #bins in phi0
194 //pt_min = mimium Pt of track (corresponding to maximum kappa)
195 //phi_min = mimimum phi0 (degrees)
196 //phi_max = maximum phi0 (degrees)
198 Double_t x = AliL3Transform::GetBFact()*AliL3Transform::GetBField()/pt_min;
199 Double_t torad = AliL3Transform::Pi()/180;
200 CreateHistograms(nxbin,-1.*x,x,nybin,phimin*torad,phimax*torad);
203 void AliL3HoughTransformerLUT::CreateHistograms(Int_t nxbin,Double_t xmin,Double_t xmax,Int_t nybin,Double_t ymin,Double_t ymax)
205 fParamSpace = new AliL3Histogram*[fNEtas];
207 Char_t histname[256];
208 for(Int_t i=0; i<fNEtas; i++)
210 sprintf(histname,"paramspace_%d",i);
211 fParamSpace[i] = new AliL3Histogram(histname,"",nxbin,xmin,xmax,nybin,ymin,ymax);
217 AliL3Histogram *hist = fParamSpace[0];
218 Int_t ncells = (hist->GetNbinsX()+2)*(hist->GetNbinsY()+2);
219 cout<<"Allocating "<<fNEtas*ncells*sizeof(TrackIndex)<<" bytes to fTrackID"<<endl;
220 fTrackID = new TrackIndex*[fNEtas];
221 for(Int_t i=0; i<fNEtas; i++)
222 fTrackID[i] = new TrackIndex[ncells];
226 //create lookup table for sin and cos
229 fLUTphi0=new Float_t[fNPhi0];
230 fLUT2sinphi0=new Float_t[fNPhi0];
231 fLUT2cosphi0=new Float_t[fNPhi0];
232 Float_t diff=(ymax-ymin)/nybin;
233 Float_t phi0=ymin-0.5*diff;
234 for(Int_t i=0; i<fNPhi0; i++){
237 fLUT2sinphi0[i]=2.*sin(phi0);
238 fLUT2cosphi0[i]=2.*cos(phi0);
239 //cout << i << ": " << fLUTphi0[i] << " " << fLUT2sinphi0[i] << " " << fLUT2cosphi0[i] << endl;
243 void AliL3HoughTransformerLUT::Reset()
245 //Reset all the histograms
249 LOG(AliL3Log::kWarning,"AliL3HoughTransformer::Reset","Histograms")
250 <<"No histograms to reset"<<ENDLOG;
254 for(Int_t i=0; i<fNEtas; i++)
255 fParamSpace[i]->Reset();
259 AliL3Histogram *hist = fParamSpace[0];
260 Int_t ncells = (hist->GetNbinsX()+2)*(hist->GetNbinsY()+2);
261 for(Int_t i=0; i<fNEtas; i++)
262 memset(fTrackID[i],0,ncells*sizeof(TrackIndex));
267 Int_t AliL3HoughTransformerLUT::GetEtaIndex(Double_t eta)
269 //Return the histogram index of the corresponding eta.
271 Float_t rz2=CalcRoverZ2(eta);
272 return FindIndex(rz2);
275 Int_t AliL3HoughTransformerLUT::FindIndex(Float_t rz2)
277 Int_t index=0; //could improve search through devide and conquere strategy
278 while((index<fNEtas)&&(rz2<=fLUTEta[index])){
280 //cout << index << ": " << rz2 << " " << fLUTEta[index] << endl;
285 inline AliL3Histogram *AliL3HoughTransformerLUT::GetHistogram(Int_t eta_index)
287 if(!fParamSpace || eta_index >= fNEtas || eta_index < 0)
289 if(!fParamSpace[eta_index])
291 return fParamSpace[eta_index];
294 Float_t AliL3HoughTransformerLUT::CalcRoverZ2(Float_t eta)
296 Float_t e=exp(2*eta);
297 Float_t ret=(e+1)/(e-1);
302 Float_t AliL3HoughTransformerLUT::CalcEta(Float_t roverz2)
304 Float_t rz=sqrt(roverz2);
306 Float_t ret=(1+rz)/(rz-1);
311 Float_t AliL3HoughTransformerLUT::CalcX(Int_t row)
316 Float_t AliL3HoughTransformerLUT::CalcY(Int_t pad,Int_t row)
318 return pad*fPadPitch-fLUTY[row];
321 Float_t AliL3HoughTransformerLUT::CalcZ(Int_t time)
323 Float_t ret=time*fTimeWidth;
324 if(fZSign>0) ret=fZLengthPlusOff-ret;
325 else ret=ret-fZLengthPlusOff;
329 Double_t AliL3HoughTransformerLUT::GetEta(Int_t eta_index,Int_t slice)
331 if(eta_index >= fNEtas || eta_index < 0){
332 //LOG(AliL3Log::kWarning,"AliL3HoughTransformerLUT::GetEta","Index") << "Index out of range."<<ENDLOG;
336 //LOG(AliL3Log::kWarning,"AliL3HoughTransformerLUT::GetEta","Index") << "Given slice does not match internal slice."<<ENDLOG;
340 return (CalcEta(fLUTEta[eta_index])-0.5*fEtaSlice);
343 void AliL3HoughTransformerLUT::TransformCircle()
345 //Transform the input data with a circle HT.
346 //The function loops over all the data, and transforms each pixel with the equation:
348 //kappa = 2/R^2 * (y*cos(phi0) - x*sin(phi0) )
350 //where R^2 = x^2 + y^2
352 //Each pixel then transforms into a curve in the (kappa,phi0)-space. In order to find
353 //which histogram in which the pixel should be transformed, the eta-value is calcluated
354 //and the proper histogram index is found by GetEtaIndex(eta).
356 AliL3DigitRowData *tempPt = GetDataPointer();
359 LOG(AliL3Log::kError,"AliL3HoughTransformerLUT::TransformCircle","Data")
360 <<"No input data "<<ENDLOG;
364 //Loop over the padrows:
365 for(Int_t i=fMinRow, row=0; i<=fMaxRow; i++, row++)
367 //Get the data on this padrow:
368 AliL3DigitData *digPt = tempPt->fDigitData;
369 if(i != (Int_t)tempPt->fRow)
371 LOG(AliL3Log::kError,"AliL3HoughTransformerLUT::TransformCircle","Data")
372 <<"AliL3HoughTransformerLUT::TransformCircle : Mismatching padrow numbering "<<i<<" != "<<(Int_t)tempPt->fRow<<ENDLOG;
376 //Loop over the data on this padrow:
377 for(UInt_t j=0; j<tempPt->fNDigit; j++)
379 UShort_t charge = digPt[j].fCharge;
382 if((Int_t)charge <= GetLowerThreshold() || (Int_t)charge > GetUpperThreshold())
385 UChar_t pad = digPt[j].fPad;
386 UShort_t time = digPt[j].fTime;
388 Float_t x = CalcX(row);
389 Float_t y = CalcY(pad,row);
390 Float_t z = CalcZ(time);
393 Float_t rz2 = 1 + (x*x+y*y)/(z*z);
394 Int_t eta_index = FindIndex(rz2);
396 if(eta_index < 0 || eta_index >= fNEtas){
397 //LOG(AliL3Log::kWarning,"AliL3HoughTransformerLUT::TransformCircle","Histograms")<<"No histograms corresponding to eta index value of "<<eta_index<<"."<<ENDLOG;
401 //Get the correct histogrampointer:
402 AliL3Histogram *hist = fParamSpace[eta_index];
404 //LOG(AliL3Log::kWarning,"AliL3HoughTransformerLUT::TransformCircle","Histograms")<<"Error getting histogram in index "<<eta_index<<"."<<ENDLOG;
408 //Fill the histogram along the phirange
409 Float_t R2=1/(x*x+y*y);
410 for(Int_t b=0; b<fNPhi0; b++){
411 Float_t kappa=R2*(y*fLUT2cosphi0[b]-x*fLUT2sinphi0[b]);
413 hist->Fill(kappa,fLUTphi0[b],charge);
414 //cout << kappa << " " << fLUTphi0[b] << " " << charge << endl;
419 Int_t bin = hist->FindBin(kappa,phi0);
420 for(Int_t t=0; t<3; t++)
422 Int_t label = digPt[j].fTrackID[t];
425 for(c=0; c<MaxTrack; c++)
426 if(fTrackID[eta_index][bin].fLabel[c] == label || fTrackID[eta_index][bin].fNHits[c] == 0)
428 if(c == MaxTrack-1) LOG(AliL3Log::kError,"AliL3HoughTransformerLUT::TransformCircle","MCData") <<"Array reached maximum!! "<<c<<endl;
429 fTrackID[eta_index][bin].fLabel[c] = label;
430 fTrackID[eta_index][bin].fNHits[c]++;
436 //Move the data pointer to the next padrow:
437 AliL3MemHandler::UpdateRowPointer(tempPt);
441 Int_t AliL3HoughTransformerLUT::GetTrackID(Int_t eta_index,Double_t kappa,Double_t psi)
445 cerr<<"AliL3HoughTransformer::GetTrackID : Flag switched off"<<endl;
450 if(eta_index < 0 || eta_index > fNEtas)
452 cerr<<"AliL3HoughTransformer::GetTrackID : Wrong etaindex "<<eta_index<<endl;
455 AliL3Histogram *hist = fParamSpace[eta_index];
456 Int_t bin = hist->FindBin(kappa,psi);
459 for(UInt_t i=0; i<MaxTrack; i++)
461 Int_t nhits=fTrackID[eta_index][bin].fNHits[i];
462 if(nhits == 0) break;
466 label = fTrackID[eta_index][bin].fLabel[i];
471 cout<<"AliL3HoughTransformer::GetTrackID : Compile with do_mc flag!"<<endl;
475 void AliL3HoughTransformerLUT::Print()
477 cout << "fSlice: " << GetSlice() << endl;
478 cout << "fPatch: " << GetPatch() << endl;
479 cout << "fSector: " << fSector << endl;
480 cout << "fSectorRow: " << fSectorRow << endl;
481 cout << "fMinRow: " << fMinRow << endl;
482 cout << "fMaxRow: " << fMaxRow << endl;
483 cout << "fNRows: " << fNRows << endl;
484 cout << "fNEtas: " << fNEtas << endl;
485 cout << "fNPhi0: " << fNPhi0 << endl;
486 cout << "fZSign: " << fZSign << endl;
487 cout << "fZLengthPlusOff: " << fZLengthPlusOff << endl;
488 cout << "fPadPitch: " << fPadPitch << endl;
489 cout << "fTimeWidth: " << fTimeWidth << endl;
492 cout << "fLUTX " << fNRows << endl;
493 for(Int_t i=0;i<fNRows;i++) cout << "fLUTX[" << i << "]=" << (Float_t)fLUTX[i] << endl;
494 cout << "fLUTY " << fNRows << endl;
495 for(Int_t i=0;i<fNRows;i++) cout << "fLUTY[" << i << "]=" << fLUTY[i] << endl;
497 cout << "fLUTEta " << fNEtas << endl;
498 for(Int_t i=0;i<fNEtas;i++) cout << "fLUTEta[" << i << "]=" << fLUTEta[i] << endl;
500 cout << "fLUTphi0 " << fNPhi0 << endl;
501 for(Int_t i=0;i<fNPhi0;i++) cout << "fLUTPhi0[" << i << "]=" << fLUTphi0[i] << endl;
502 cout << "fLUT2sinphi0 " << fNPhi0 << endl;
503 for(Int_t i=0;i<fNPhi0;i++) cout << "fLUT2sinphi0[" << i << "]=" << fLUT2sinphi0[i] << endl;
504 cout << "fLUT2cosphi0 " << fNPhi0 << endl;
505 for(Int_t i=0;i<fNPhi0;i++) cout << "fLUT2cosphi0[" << i << "]=" << fLUT2cosphi0[i] << endl;