CDCTrigger3DFitterModule::HoughVoter Class Reference

Class for the Hough voter. More...

Public Member Functions
void	vote (const std::vector< std::vector< double > > &sCand, const std::vector< std::vector< double > > &zCand)
std::tuple< double, double, int >	findPeak ()

Private Member Functions
int	digitizeZ0 (double z0)
int	digitizeCot (double cot)
double	getZ0CellValue (double iZ0)
double	getCotCellValue (double iCot)

Private Attributes
const int	nCellZ0 = 16
const int	nCellCot = 16
const double	minZ0 = -50
const double	maxZ0 = 78
const double	minCot = -0.8
const double	maxCot = 1.5
const double	cellWidthZ0 = (maxZ0 - minZ0) / nCellZ0
const double	cellWidthCot = (maxCot - minCot) / nCellCot
std::vector< std::vector< int > >	votingCell

Detailed Description

Class for the Hough voter.

Definition at line 53 of file CDCTrigger3DFitterModule.h.

Constructor & Destructor Documentation

HoughVoter()

HoughVoter

(

)

Definition at line 238 of file CDCTrigger3DFitterModule.cc.

{
  votingCell.resize(nCellZ0, vector<int>(nCellZ0, 0));
}

Member Function Documentation

digitizeCot()

int digitizeCot ( double  cot )

inlineprivate

Definition at line 68 of file CDCTrigger3DFitterModule.h.

{return floor((cot - minCot) / cellWidthCot);}

digitizeZ0()

int digitizeZ0 ( double  z0 )

inlineprivate

Definition at line 67 of file CDCTrigger3DFitterModule.h.

{return floor((maxZ0 - z0) / cellWidthZ0);}

findPeak()

tuple< double, double, int > findPeak

(

)

Definition at line 275 of file CDCTrigger3DFitterModule.cc.

{
  int maxCount = 0;
  double z0, cot;
  for (int iZ0 = 0; iZ0 < nCellZ0; iZ0++) {
    for (int iCot = nCellCot - 1; iCot >= 0; iCot--) {
      int count = __builtin_popcount(votingCell[iZ0][iCot]);
      if (maxCount <= count) {
        maxCount = count;
        z0 = getZ0CellValue(iZ0);
        cot = getCotCellValue(iCot);
      }
    }
  }
  return make_tuple(z0, cot, maxCount);
}

getCotCellValue()

double getCotCellValue ( double  iCot )

inlineprivate

Definition at line 71 of file CDCTrigger3DFitterModule.h.

{return minCot + (iCot + 0.5) * cellWidthCot;}

getZ0CellValue()

double getZ0CellValue ( double  iZ0 )

inlineprivate

Definition at line 70 of file CDCTrigger3DFitterModule.h.

{return maxZ0 - (iZ0 + 0.5) * cellWidthZ0;}

vote()

void vote	(	const std::vector< std::vector< double > > &	sCand,
		const std::vector< std::vector< double > > &	zCand
	)

Definition at line 244 of file CDCTrigger3DFitterModule.cc.

{
  //              iCot=0(minCot) ... iCot=m(maxCot)
  // iZ0=0(maxZ0)
  // ...
  // iZ0=n(minZ0)
  for (int iLayer = 0; iLayer < m_nStereoLayer; iLayer++) {
    for (int iHit = 0; iHit < (int)sCand[iLayer].size(); iHit++) {
      double s = sCand[iLayer][iHit];
      double z = zCand[iLayer][iHit];
 
      for (int iCot = 0; iCot < nCellCot; iCot++) {
        int iZ0Shift = floor((z - (-cellWidthZ0 / 2)) / cellWidthZ0);
 
        double cotLower = getCotCellValue(iCot - 0.5);
        double z0Lower = -s * cotLower;
        int iZ0Lower = digitizeZ0(z0Lower) - iZ0Shift;
 
        double cotUpper = getCotCellValue(iCot + 0.5);
        double z0Upper = -s * cotUpper;
        int iZ0Upper = digitizeZ0(z0Upper) - iZ0Shift;
 
        for (int iZ0 = max(iZ0Lower, 0); iZ0 < min(iZ0Upper + 1, nCellZ0); iZ0++) {
          votingCell[iZ0][iCot] |= (1 << iLayer);
        }
      }
    }
  }
}

Member Data Documentation

cellWidthCot

const double cellWidthCot = (maxCot - minCot) / nCellCot

private

Definition at line 62 of file CDCTrigger3DFitterModule.h.

cellWidthZ0

const double cellWidthZ0 = (maxZ0 - minZ0) / nCellZ0

private

Definition at line 61 of file CDCTrigger3DFitterModule.h.

maxCot

const double maxCot = 1.5

private

Definition at line 60 of file CDCTrigger3DFitterModule.h.

maxZ0

const double maxZ0 = 78

private

Definition at line 58 of file CDCTrigger3DFitterModule.h.

minCot

const double minCot = -0.8

private

Definition at line 59 of file CDCTrigger3DFitterModule.h.

minZ0

const double minZ0 = -50

private

Definition at line 57 of file CDCTrigger3DFitterModule.h.

nCellCot

const int nCellCot = 16

private

Definition at line 56 of file CDCTrigger3DFitterModule.h.

nCellZ0

const int nCellZ0 = 16

private

Definition at line 55 of file CDCTrigger3DFitterModule.h.

votingCell

std::vector<std::vector<int> > votingCell

private

Definition at line 65 of file CDCTrigger3DFitterModule.h.

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The documentation for this class was generated from the following files:

• trg/cdc/modules/fitting/include/CDCTrigger3DFitterModule.h
• trg/cdc/modules/fitting/src/CDCTrigger3DFitterModule.cc