org.lcsim.emcluster
Class EMConeClusterBuilder

java.lang.Object
  hep.lcd.util.driver.AbstractProcessor
      org.lcsim.emcluster.EMConeClusterBuilder

All Implemented Interfaces:

hep.lcd.util.driver.Processor

public class EMConeClusterBuilder

extends hep.lcd.util.driver.AbstractProcessor

EMConeClusterBuilder implements a q-f cone clustering algorithm that assigns all neighboring hits to the same cluster if they fall within a radius R of the cluster axis. The axis is originally defined by a seed cell, and is iteratively updated as cells are added. This version of the ClusterBuilder splits overlapping clusters by assigning cells in the overlap region to the nearest cluster axis.

Author:

Norman A. Graf

Field Summary

Fields inherited from class hep.lcd.util.driver.AbstractProcessor

context

Constructor Summary

EMConeClusterBuilder(double radius, double seed, double minE)
Constructor

Method Summary

java.util.List	cluster(hep.lcd.event.CalorimeterHits hits) Takes a list of CalorimeterHits, clusters them, and returns a list of EMClusters
java.util.List	cluster(java.util.Vector in) Takes a list of CalorimeterHits, clusters them, and returns a list of EMClusters
double	dTheta(EMCluster c1, EMCluster c2) Calculate the angle between two EMClusters
void	process(hep.lcd.event.LCDEvent event) Processes an LCDEvent to find EMClusters
void	resolve(EMCluster c1, EMCluster c2) Given two overlapping clusters, assign cells to nearest axis.

Methods inherited from class hep.lcd.util.driver.AbstractProcessor

clearContext, getDebugLevel, getDebugStream, getEventPrefix, getHistogramLevel, getName, getParameterFile, getParameters, getParameters, getRandom, histogram, init, setContext, setDebugLevel, setDetector, setEventPrefix, setHistogramLevel, start, stop

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

EMConeClusterBuilder

public EMConeClusterBuilder(double radius,
                            double seed,
                            double minE)

Constructor

Parameters:

radius - The cone radius in q-f space

seed - The minimum energy for a cone seed cell (in GeV)

minE - The minimum energy for a cluster (in GeV)

Method Detail

process

public void process(hep.lcd.event.LCDEvent event)

Processes an LCDEvent to find EMClusters

Parameters:

event - The LCDEvent to process

cluster

public java.util.List cluster(hep.lcd.event.CalorimeterHits hits)

Takes a list of CalorimeterHits, clusters them, and returns a list of EMClusters

Parameters:

hits - The CalorimeterHits collection of CalorimeterHits

Returns:

Vector of found EMClusters

cluster

public java.util.List cluster(java.util.Vector in)

Takes a list of CalorimeterHits, clusters them, and returns a list of EMClusters

Returns:

Vector of found EMClusters

dTheta

public double dTheta(EMCluster c1,
                     EMCluster c2)

Calculate the angle between two EMClusters

Parameters:

c1 - First EMCluster

c2 - Second EMCluster

Returns:

The angle between the two clusters

resolve

public void resolve(EMCluster c1,
                    EMCluster c2)

Given two overlapping clusters, assign cells to nearest axis. The cluster axes are not iterated. Cluster quantities are recalculated after the split.

Parameters:

c1 - First EMCluster

c2 - Second EMCluster