3 // Author: Constantin Loizides <mailto:loizides@ikf.uni-frankfurt.de>
4 //*-- Copyright © ALICE HLT Group
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"
21 //_____________________________________________________________
22 // AliL3HoughTransformerLUT
24 // Hough transformation class using Look-UP-Tables
27 ClassImp(AliL3HoughTransformerLUT)
29 AliL3HoughTransformerLUT::AliL3HoughTransformerLUT() : AliL3HoughBaseTransformer()
62 AliL3HoughTransformerLUT::AliL3HoughTransformerLUT(Int_t slice,Int_t patch,Int_t n_eta_segments) : AliL3HoughBaseTransformer(slice,patch,n_eta_segments)
92 Init(slice,patch,n_eta_segments);
95 AliL3HoughTransformerLUT::~AliL3HoughTransformerLUT()
107 delete[] fLUTEtaReal;
112 void AliL3HoughTransformerLUT::DeleteHistograms()
115 delete[] fLUT2sinphi0;
116 delete[] fLUT2cosphi0;
127 for(Int_t i=0; i<fNEtas; i++)
129 if(!fParamSpace[i]) continue;
130 delete fParamSpace[i];
132 delete [] fParamSpace;
136 void AliL3HoughTransformerLUT::Init(Int_t slice,Int_t patch,Int_t n_eta_segments,Int_t n_seqs)
138 AliL3HoughBaseTransformer::Init(slice,patch,n_eta_segments);
140 //delete old LUT tables
148 delete[] fLUTEtaReal;
153 fMinRow=AliL3Transform::GetFirstRow(patch);;
154 fMaxRow=AliL3Transform::GetLastRow(patch);;
155 fNRows=AliL3Transform::GetNRows(patch);;
156 fNEtas=n_eta_segments;
157 if(fNEtas!=GetNEtaSegments()) {
158 cerr << "AliL3HoughTransformerLUT::Init -> Error: Number of Etas must be equal!" << endl;
162 AliL3Transform::Slice2Sector(slice,fMinRow,fSector,fSectorRow);
163 fZSign = slice < 18 ? 1:-1;
165 fZLengthPlusOff=AliL3Transform::GetZLength()+AliL3Transform::GetZOffset();
166 fTimeWidth=AliL3Transform::GetZWidth();
169 if(fSector<AliL3Transform::GetNSectorLow())
170 fPadPitch=AliL3Transform::GetPadPitchWidthLow();
172 fPadPitch=AliL3Transform::GetPadPitchWidthUp();
174 Float_t etamax_=GetEtaMax();
175 Float_t etamin_=GetEtaMin();
176 fEtaSlice=(etamax_-etamin_)/n_eta_segments;
178 //lookup tables for X and Y
179 fLUTX=new Float_t[fNRows];
180 fLUTY=new Float_t[fNRows];
181 for(Int_t rr=0;rr<fNRows;rr++){
182 fLUTX[rr]=Float_t(AliL3Transform::Row2X(rr+fMinRow));
183 fLUTY[rr]=Float_t(0.5*(AliL3Transform::GetNPads(rr+fMinRow)-1)*fPadPitch);
184 //cout << rr << ": " << (Float_t)fLUTX[rr] << " " << (Float_t)fLUTY[rr] << endl;
187 //lookup tables for rz2s <=> etas
188 fLUTEta=new Float_t[fNEtas];
189 fLUTEtaReal=new Float_t[fNEtas];
190 for(Int_t rr=0;rr<fNEtas;rr++){
191 Float_t eta=etamin_+(rr+1)*fEtaSlice;
192 fLUTEta[rr]=CalcRoverZ2(eta);
193 fLUTEtaReal[rr]=eta-0.5*fEtaSlice;
194 //cout << rr << ": " << eta << " " << fLUTEtaReal[rr] << " " << GetEta(rr,fSlice) << " - " << fLUTEta[rr] << endl;
198 void AliL3HoughTransformerLUT::CreateHistograms(Int_t nxbin,Double_t pt_min,Int_t nybin,Double_t phimin,Double_t phimax)
200 //Create the histograms (parameter space).
201 //These are 2D histograms, span by kappa (curvature of track) and phi0 (emission angle with x-axis).
202 //The arguments give the range and binning;
203 //nxbin = #bins in kappa
204 //nybin = #bins in phi0
205 //pt_min = mimium Pt of track (corresponding to maximum kappa)
206 //phi_min = mimimum phi0 (degrees)
207 //phi_max = maximum phi0 (degrees)
209 Double_t x = AliL3Transform::GetBFact()*AliL3Transform::GetBField()/pt_min;
210 Double_t torad = AliL3Transform::Pi()/180;
211 CreateHistograms(nxbin,-1.*x,x,nybin,phimin*torad,phimax*torad);
214 void AliL3HoughTransformerLUT::CreateHistograms(Int_t nxbin,Double_t xmin,Double_t xmax,Int_t nybin,Double_t ymin,Double_t ymax)
216 fParamSpace = new AliL3Histogram*[fNEtas];
218 Char_t histname[256];
219 for(Int_t i=0; i<fNEtas; i++)
221 sprintf(histname,"paramspace_%d",i);
222 fParamSpace[i] = new AliL3Histogram(histname,"",nxbin,xmin,xmax,nybin,ymin,ymax);
225 //create lookup table for sin and cos
228 fLUTphi0=new Float_t[fNPhi0];
229 fLUT2sinphi0=new Float_t[fNPhi0];
230 fLUT2cosphi0=new Float_t[fNPhi0];
231 fLUTKappa=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);
240 //cout << i << ": " << fLUTphi0[i] << " " << fLUT2sinphi0[i] << " " << fLUT2cosphi0[i] << endl;
244 void AliL3HoughTransformerLUT::Reset()
246 //Reset all the histograms
250 LOG(AliL3Log::kWarning,"AliL3HoughTransformer::Reset","Histograms")
251 <<"No histograms to reset"<<ENDLOG;
255 for(Int_t i=0; i<fNEtas; i++)
256 fParamSpace[i]->Reset();
259 Int_t AliL3HoughTransformerLUT::GetEtaIndex(Double_t eta)
261 //Return the histogram index of the corresponding eta.
264 /* try to imitate a circuit -> should
265 go into the VHDL implementation of transformer */
266 Float_t rz2=CalcRoverZ2(eta);
267 return FindIndex(rz2);
268 #else /* optimize for speed on the computer */
269 Double_t index = (eta-GetEtaMin())/fEtaSlice;
274 Int_t AliL3HoughTransformerLUT::FindIndex(Float_t rz2, Int_t start)
276 //could improve search through devide and conquere strategy
281 while((index<fNEtas)&&(rz2<=fLUTEta[index])){
285 while((index>=0)&&(rz2>fLUTEta[index])){
290 //cout << start << " - " << index << " " << ": " << rz2 << " " << fLUTEta[index] << endl;
295 inline AliL3Histogram *AliL3HoughTransformerLUT::GetHistogram(Int_t eta_index)
297 if(!fParamSpace || eta_index >= fNEtas || eta_index < 0)
299 if(!fParamSpace[eta_index])
301 return fParamSpace[eta_index];
304 Float_t AliL3HoughTransformerLUT::CalcRoverZ2(Float_t eta)
306 Float_t e=exp(2*eta);
307 Float_t ret=(e+1)/(e-1);
312 Float_t AliL3HoughTransformerLUT::CalcEta(Float_t roverz2)
314 Float_t rz=sqrt(roverz2);
316 Float_t ret=(1+rz)/(rz-1);
321 Float_t AliL3HoughTransformerLUT::CalcX(Int_t row)
326 Float_t AliL3HoughTransformerLUT::CalcY(Int_t pad,Int_t row)
328 return pad*fPadPitch-fLUTY[row];
331 Float_t AliL3HoughTransformerLUT::CalcZ(Int_t time)
333 Float_t ret=time*fTimeWidth;
334 if(fZSign>0) ret=fZLengthPlusOff-ret;
335 else ret=ret-fZLengthPlusOff;
339 Double_t AliL3HoughTransformerLUT::GetEta(Int_t eta_index,Int_t slice)
341 if(eta_index >= fNEtas || eta_index < 0){
342 //LOG(AliL3Log::kWarning,"AliL3HoughTransformerLUT::GetEta","Index") << "Index out of range."<<ENDLOG;
346 //LOG(AliL3Log::kWarning,"AliL3HoughTransformerLUT::GetEta","Index") << "Given slice does not match internal slice."<<ENDLOG;
350 //return (CalcEta(fLUTEta[eta_index])-0.5*fEtaSlice);
351 return(fLUTEtaReal[eta_index]);
354 void AliL3HoughTransformerLUT::AddCurveToHistogram(Int_t new_eta_index)
356 //Get the correct histogrampointer:
357 AliL3Histogram *hist = fParamSpace[fLastIndex];
359 //LOG(AliL3Log::kWarning,"AliL3HoughTransformerLUT::TransformCircle","Histograms")<<"Error getting histogram in index "<<fLastIndex<<"."<<ENDLOG;
363 //Fill the histogram along the phirange
364 for(Int_t b=0; b<fNPhi0; b++){
365 hist->Fill(fLUTKappa[b],fLUTphi0[b],fAccCharge);
366 //cout << kappa << " " << fLUTphi0[b] << " " << fAccCharge << endl;
370 fLastIndex=new_eta_index;
373 void AliL3HoughTransformerLUT::TransformCircle()
375 //Transform the input data with a circle HT.
376 //The function loops over all the data, and transforms each pixel with the equation:
378 //kappa = 2/R^2 * (y*cos(phi0) - x*sin(phi0) )
380 //where R^2 = x^2 + y^2
382 //Each pixel then transforms into a curve in the (kappa,phi0)-space. In order to find
383 //which histogram in which the pixel should be transformed, the eta-value is calcluated
384 //and the proper histogram index is found by GetEtaIndex(eta).
386 AliL3DigitRowData *tempPt = GetDataPointer();
389 LOG(AliL3Log::kError,"AliL3HoughTransformerLUT::TransformCircle","Data")
390 <<"No input data "<<ENDLOG;
394 //Loop over the padrows:
395 for(Int_t i=fMinRow, row=0; i<=fMaxRow; i++, row++)
397 //Get the data on this padrow:
398 AliL3DigitData *digPt = tempPt->fDigitData;
399 if(i != (Int_t)tempPt->fRow)
401 LOG(AliL3Log::kError,"AliL3HoughTransformerLUT::TransformCircle","Data")
402 <<"AliL3HoughTransformerLUT::TransformCircle : Mismatching padrow numbering "<<i<<" != "<<(Int_t)tempPt->fRow<<ENDLOG;
406 //calculate x for this row
407 Float_t x = CalcX(row);
414 if(fAccCharge>0) cerr << "Big error " << endl;
416 //accumulate charge per histogram
420 //Loop over the data on this padrow:
421 for(UInt_t j=0; j<tempPt->fNDigit; j++)
423 UShort_t charge = digPt[j].fCharge;
426 if((Int_t)charge <= GetLowerThreshold() || (Int_t)charge > GetUpperThreshold())
429 UChar_t pad = digPt[j].fPad;
430 UShort_t time = digPt[j].fTime;
432 if(fLastPad!=pad){ //only update if necessary
434 //if there is accumalated charge, put it in the right histogram
435 if(fAccCharge>0) AddCurveToHistogram(-1);
441 //calculate hough for the new pad
442 Float_t y = CalcY(pad,row);
448 //AliL3Histogram *hist = fParamSpace[0];
449 //Int_t bb=hist->GetFirstYbin();
450 //if(fNPhi0-1!=hist->GetLastYbin()) cerr << "should not be" << endl;
451 for(Int_t b=0; b<fNPhi0; b++){
452 fLUTKappa[b]=(yr2*fLUT2cosphi0[b]-xr2*fLUT2sinphi0[b]);
454 //Float_t phi=atan2(y,x);
455 //Float_t phi0 = hist->GetBinCenterY(bb);
456 //Float_t R=sqrt(r2);
457 //Float_t kappa = 2*sin(phi - phi0)/R;
458 //cout << fLUTKappa[b] << " " << kappa << endl;
460 //Int_t bina=hist->FindBin(fLUTphi0[b],fLUTKappa[b]);
461 //Int_t binb=hist->FindBin(phi0,kappa);
462 //if(bina!=binb) cout << bina << " " << binb << endl;
469 Float_t z = CalcZ(time);
473 Float_t rz2 = 1 + r2/z2;
474 Int_t eta_index = FindIndex(rz2,fLastIndex);
476 Double_t r = sqrt(r2+z2);
477 Double_t etaval = 0.5 * log((r+z)/(r-z));
478 Int_t eta_index = GetEtaIndex(etaval);
480 //cout << row << " " << (int)pad << " " << (int)time << " " << eta_index << " " << fLastIndex << endl;
481 if(eta_index < 0 || eta_index >= fNEtas){
482 //LOG(AliL3Log::kWarning,"AliL3HoughTransformerLUT::TransformCircle","Histograms")<<"No histograms corresponding to eta index value of "<<eta_index<<"."<<ENDLOG;
487 if(fLastIndex==-1) fLastIndex=eta_index;
490 if(fLastIndex!=eta_index){
491 AddCurveToHistogram(eta_index);
498 //in case there is charge, store it before moving to the next row
499 if(fAccCharge>0) AddCurveToHistogram(-1);
501 //Move the data pointer to the next padrow:
502 AliL3MemHandler::UpdateRowPointer(tempPt);
505 if(fAccCharge>0) cerr << "Big error " << endl;
508 Int_t AliL3HoughTransformerLUT::GetTrackID(Int_t eta_index,Double_t kappa,Double_t psi)
512 cerr<<"AliL3HoughTransformerLUT does not provide MC information..."<<endl;
519 void AliL3HoughTransformerLUT::Print()
521 cout << "fSlice: " << GetSlice() << endl;
522 cout << "fPatch: " << GetPatch() << endl;
523 cout << "fSector: " << fSector << endl;
524 cout << "fSectorRow: " << fSectorRow << endl;
525 cout << "fMinRow: " << fMinRow << endl;
526 cout << "fMaxRow: " << fMaxRow << endl;
527 cout << "fNRows: " << fNRows << endl;
528 cout << "fNEtas: " << fNEtas << endl;
529 cout << "fNPhi0: " << fNPhi0 << endl;
530 cout << "fZSign: " << fZSign << endl;
531 cout << "fZLengthPlusOff: " << fZLengthPlusOff << endl;
532 cout << "fPadPitch: " << fPadPitch << endl;
533 cout << "fTimeWidth: " << fTimeWidth << endl;
536 cout << "fLUTX " << fNRows << endl;
537 for(Int_t i=0;i<fNRows;i++) cout << "fLUTX[" << i << "]=" << (Float_t)fLUTX[i] << endl;
538 cout << "fLUTY " << fNRows << endl;
539 for(Int_t i=0;i<fNRows;i++) cout << "fLUTY[" << i << "]=" << fLUTY[i] << endl;
541 cout << "fLUTEta " << fNEtas << endl;
542 for(Int_t i=0;i<fNEtas;i++) cout << "fLUTEta[" << i << "]=" << fLUTEta[i] << endl;
543 cout << "fLUTEtaReal " << fNEtas << endl;
544 for(Int_t i=0;i<fNEtas;i++) cout << "fLUTEtaReal[" << i << "]=" << fLUTEtaReal[i] << endl;
546 cout << "fLUTphi0 " << fNPhi0 << endl;
547 for(Int_t i=0;i<fNPhi0;i++) cout << "fLUTPhi0[" << i << "]=" << fLUTphi0[i] << endl;
548 cout << "fLUT2sinphi0 " << fNPhi0 << endl;
549 for(Int_t i=0;i<fNPhi0;i++) cout << "fLUT2sinphi0[" << i << "]=" << fLUT2sinphi0[i] << endl;
550 cout << "fLUT2cosphi0 " << fNPhi0 << endl;
551 for(Int_t i=0;i<fNPhi0;i++) cout << "fLUT2cosphi0[" << i << "]=" << fLUT2cosphi0[i] << endl;