de.unihalle.informatik.MiToBo.segmentation.activecontours.energies

Class MTBActiveContourEnergy_MeanSep

java.lang.Object

de.unihalle.informatik.MiToBo.segmentation.activecontours.energies.MTBActiveContourEnergy_MeanSep

@ALDParametrizedClass
public class MTBActiveContourEnergy_MeanSep
extends Object

Active contour energy based on region mean separation.

This energy model tries to best separate the average intensity values of the inner and outer regions of a contour:

\begin{equation} E^{mean} = -\frac{1}{2} \cdot (\mu_{in} - \mu_{out})^2 \end{equation}

The Gataeux derivative is given by

\begin{equation} \frac{ \partial }{ \partial c(s) } E^{mean} = - (\mu_{in} - \mu_{out}) \cdot \left( \frac{I(x,y) - \mu_{in}}{A_{in}} + \frac{I(x,y) - \mu_{out}}{A_{out}} \right) \end{equation}

For details refer to:

Yezzi, Tsai, Willsky, "A Fully Global Approach to Image Segmentation via Coupled Curve Evolution Equations", JVCIR, 13, 195-216 (2002)

Author:

moeller

Field Summary

Fields

Modifier and Type	Field and Description
protected int[]	areas Region sizes.
protected int	iDepth Depth of working image.
protected int	iHeight Height of working image.
protected CalcSegmentationStatistics	imgStatsOp Operator to calculate energy parameters.
protected MTBImage	inImg Image to work on.
protected double	inRange Dynamic range of image intensities.
protected int	iSize Total area/volume of working image.
protected int	iWidth Width of working image.
protected double[]	means Average intensities.

Constructor Summary

Constructors

Constructor and Description
MTBActiveContourEnergy_MeanSep() Default constructor.
MTBActiveContourEnergy_MeanSep(MTBImage im) Default constructor with parameter.

Method Summary

Modifier and Type	Method and Description
protected double	getDerivative(MTBSegmentationInterface seg, int x, int y, int z) Returns the energy derivative value at position (x,y,z).
protected double	getEnergyDerivativeMaxVal() Returns the maximum possible derivative value this energy may yield.
double	getEnergyDerivativeMinVal() Returns the minimum possible derivative value this energy may yield.
protected void	init() Method to properly initialize instances of this class.
String	toString()
protected void	updateParameters(MTBSegmentationInterface seg) Updates internal parameters according to given segmentation.

Methods inherited from class java.lang.Object

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

Field Detail

inImg

@ALDClassParameter(label="Input Image",
                   mode=ADVANCED,
                   dataIOOrder=-10)
protected transient MTBImage inImg

Image to work on.

iWidth

protected transient int iWidth

Width of working image.

iHeight

protected transient int iHeight

Height of working image.

iDepth

protected transient int iDepth

Depth of working image.

iSize

protected transient int iSize

Total area/volume of working image.

inRange

protected transient double inRange

Dynamic range of image intensities.

imgStatsOp

protected transient CalcSegmentationStatistics imgStatsOp

Operator to calculate energy parameters.

Parameter are basically the region sizes and intensity averages.

areas

protected transient int[] areas

Region sizes.

means

protected transient double[] means

Average intensities.

Constructor Detail

MTBActiveContourEnergy_MeanSep

public MTBActiveContourEnergy_MeanSep()

Default constructor.

MTBActiveContourEnergy_MeanSep

public MTBActiveContourEnergy_MeanSep(MTBImage im)

Default constructor with parameter.

Parameters:

im - Image to work on.

Method Detail

init

protected void init()
             throws MTBActiveContourException

Method to properly initialize instances of this class.

Throws:

de.unihalle.informatik.Alida.exceptions.ALDOperatorException

MTBActiveContourException

updateParameters

protected void updateParameters(MTBSegmentationInterface seg)
                         throws MTBActiveContourException

Updates internal parameters according to given segmentation.

Parameters:

seg - Current segmentation.

Throws:

MTBActiveContourException

getDerivative

protected double getDerivative(MTBSegmentationInterface seg,
                               int x,
                               int y,
                               int z)

Returns the energy derivative value at position (x,y,z).

toString

public String toString()

Overrides:

toString in class Object

getEnergyDerivativeMaxVal

protected double getEnergyDerivativeMaxVal()

Returns the maximum possible derivative value this energy may yield.

Returns:

Maximal derivative value.

getEnergyDerivativeMinVal

public double getEnergyDerivativeMinVal()

Returns the minimum possible derivative value this energy may yield.

Returns:

Minimal derivative value.