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)
	get value at the center of parameter cell
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

get value at the center of parameter cell

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