Package sc.fiji.snt.tracing.cost

Class OneMinusErf

java.lang.Object

sc.fiji.snt.tracing.cost.OneMinusErf

All Implemented Interfaces:

Cost

public class OneMinusErf
extends Object
implements Cost

A cost function inspired by an A* search implementation in the Janelia Workstation, where the cost of moving to a new voxel is given by the complementary error function 1 - erf(z), where

erf(x) is the Error Function

z is the Standard Score of the voxel intensity at the new point, given the intensity statistics of the underlying image

Author:

Cameron Arshadi

Constructor Summary

Constructors

Constructor	Description
OneMinusErf(double max, double average, double standardDeviation)

Method Summary

Modifier and Type	Method	Description
double	costMovingTo(double valueAtNewPoint)
double	getZFudge()
double	minStepCost()
void	setZFudge(double zFudge)	Scale factor for intensity z-score.
protected double	zScore(double valueAtNewPoint)

Methods inherited from class java.lang.Object

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

Constructor Details

OneMinusErf

public OneMinusErf(double max,
 double average,
 double standardDeviation)

Parameters:

max - the maximum intensity value of the image, used to compute the minimum step cost

average - the average intensity value of the image, used to compute the intensity z-score

standardDeviation - the standard deviation of the intensity values of the image, used to compute the intensity z-score

Method Details

costMovingTo

public double costMovingTo(double valueAtNewPoint)

Specified by:

costMovingTo in interface Cost

setZFudge

public void setZFudge(double zFudge)

Scale factor for intensity z-score. Values less than 1 help numerically distinguish very bright voxels, and will cause more nodes to be explored. Default is 1.0.

Parameters:

zFudge - the z-score is post-multiplied by this value

getZFudge

public double getZFudge()

zScore

protected double zScore(double valueAtNewPoint)

minStepCost

public double minStepCost()

Specified by:

minStepCost in interface Cost