de.unihalle.informatik.MiToBo.segmentation.levelset.core.energies.derivable

Class MTBLevelEnergyDerivable_Length

java.lang.Object

de.unihalle.informatik.MiToBo.segmentation.levelset.core.energies.derivable.MTBLevelEnergyDerivable_Length

All Implemented Interfaces:

MTBActiveContourEnergy, MTBActiveContourEnergyDerivable, MTBLevelsetEnergyDerivable

@ALDDerivedClass
 @ALDParametrizedClass
public class MTBLevelEnergyDerivable_Length
extends Object
implements MTBLevelsetEnergyDerivable

Energy minimizing the length of a level set's isocontour.

Author:

Michael Schneider

Field Summary

Fields

Modifier and Type	Field and Description
private DeltaApproxHelper	deltaHelper Helper object for calculating approximated values of Heaviside function.
private boolean	useHeavisideApprox Flag to indicate if the Heaviside function should be approximated.

Constructor Summary

Constructors

Constructor and Description
MTBLevelEnergyDerivable_Length() Default constructor.

Method Summary

Modifier and Type	Method and Description
double	getDerivative(MTBLevelsetFunctionDerivable phi, int x, int y, int z) Get the energy derivative value, i.e. velocity, for position (x,y,z).
double	getDerivativeWithoutDelta(MTBLevelsetFunctionDerivable phi, int x, int y, int z) Get the energy derivative value, i.e. velocity, for position (x,y,z).
boolean	initEnergy(LevelsetSolverDerivatives solver) Initializes the energy object according to given solver settings.
void	updateStatus(MTBLevelsetFunctionDerivable phi) Function which updates the internal status of the energy.
void	useHeavideApproximation(boolean flag) Enable or disable approximation of Heaviside function.
String	validate() Function to validate configuration of energy object.

Methods inherited from class java.lang.Object

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

Field Detail

useHeavisideApprox

private boolean useHeavisideApprox

Flag to indicate if the Heaviside function should be approximated.

deltaHelper

private DeltaApproxHelper deltaHelper

Helper object for calculating approximated values of Heaviside function.

Constructor Detail

MTBLevelEnergyDerivable_Length

public MTBLevelEnergyDerivable_Length()

Default constructor.

Method Detail

initEnergy

public boolean initEnergy(LevelsetSolverDerivatives solver)

Description copied from interface: MTBLevelsetEnergyDerivable

Initializes the energy object according to given solver settings.

Specified by:

initEnergy in interface MTBLevelsetEnergyDerivable

Parameters:

solver - Reference to solver which uses this energy.

Returns:

True, if initialization was successful.

updateStatus

public void updateStatus(MTBLevelsetFunctionDerivable phi)

Description copied from interface: MTBLevelsetEnergyDerivable

Function which updates the internal status of the energy.

Specified by:

updateStatus in interface MTBLevelsetEnergyDerivable

Parameters:

phi - Current level set function.

getDerivative

public double getDerivative(MTBLevelsetFunctionDerivable phi,
                            int x,
                            int y,
                            int z)

Description copied from interface: MTBLevelsetEnergyDerivable

Get the energy derivative value, i.e. velocity, for position (x,y,z).

Specified by:

getDerivative in interface MTBLevelsetEnergyDerivable

Parameters:

phi - Level set function.

x - x coordinate of requested position.

y - y coordinate of requested position.

z - z coordinate of requested position.

Returns:

Derivative value at given location.

getDerivativeWithoutDelta

public double getDerivativeWithoutDelta(MTBLevelsetFunctionDerivable phi,
                                        int x,
                                        int y,
                                        int z)

Description copied from interface: MTBLevelsetEnergyDerivable

Get the energy derivative value, i.e. velocity, for position (x,y,z).

Here the value of the Dirac impulse function is ignored (if present).

Specified by:

getDerivativeWithoutDelta in interface MTBLevelsetEnergyDerivable

Parameters:

phi - Level set function.

x - x coordinate of requested position.

y - y coordinate of requested position.

z - z coordinate of requested position.

Returns:

Derivative value without Dirac factor at given location.

validate

public String validate()

Description copied from interface: MTBLevelsetEnergyDerivable

Function to validate configuration of energy object.

Specified by:

validate in interface MTBLevelsetEnergyDerivable

Returns:

If null, everything is ok, otherwise an error message.

useHeavideApproximation

public void useHeavideApproximation(boolean flag)

Description copied from interface: MTBLevelsetEnergyDerivable

Enable or disable approximation of Heaviside function.

Specified by:

useHeavideApproximation in interface MTBLevelsetEnergyDerivable

Parameters:

flag - If true, approximation is enabled, otherwise disabled.