inra.ijpb.binary.distmap

Class ChamferDistanceTransform2DFloat

java.lang.Object

inra.ijpb.algo.AlgoStub

inra.ijpb.binary.distmap.ChamferDistanceTransform2DFloat

All Implemented Interfaces:

Algo, ChamferDistanceTransform2D, DistanceTransform

public class ChamferDistanceTransform2DFloat
extends AlgoStub
implements ChamferDistanceTransform2D

Computes distance transform on binary images by propagating distances using a ChamferMask2D, and using 32-bits floating-point computation. For label maps, an equivalent algorithm exists within the inra.ijpb.label.distmap package.

Example of use:

 
 ChamferMask2D mask = ChamferMask2D.BORGEFORS();
 boolean normalize = true;
 DistanceTransform dt = new ChamferDistanceTransform2DFloat(mask, normalize);
 ImageProcessor result = dt.distanceMap(inputImage);
 
 

Author:

David Legland

See Also:

ChamferDistanceTransform2DShort, ChamferDistanceTransform2DFloat

Constructor Summary

Constructors

Constructor and Description
ChamferDistanceTransform2DFloat(ChamferMask2D mask) Creates a new algorithm for computing distance maps based on a chamfer mask.
ChamferDistanceTransform2DFloat(ChamferMask2D mask, boolean normalize) Creates a new algorithm for computing distance maps based on a chamfer mask.

Method Summary

Modifier and Type	Method and Description
ij.process.FloatProcessor	distanceMap(ij.process.ImageProcessor binaryImage) Computes the distance map of the distance to the nearest background pixel.
ChamferMask2D	mask() Return the chamfer mask used by this distance transform algorithm.

Methods inherited from class inra.ijpb.algo.AlgoStub

addAlgoListener, fireProgressChanged, fireProgressChanged, fireStatusChanged, fireStatusChanged, removeAlgoListener

Methods inherited from class java.lang.Object

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

Methods inherited from interface inra.ijpb.algo.Algo

addAlgoListener, removeAlgoListener

Constructor Detail

ChamferDistanceTransform2DFloat

public ChamferDistanceTransform2DFloat(ChamferMask2D mask)

Creates a new algorithm for computing distance maps based on a chamfer mask. The result is normalized by dividing by the weight for orthogonal shifts.

Parameters:

mask - the chamfer mask to use for propagating distances

ChamferDistanceTransform2DFloat

public ChamferDistanceTransform2DFloat(ChamferMask2D mask,
                                       boolean normalize)

Creates a new algorithm for computing distance maps based on a chamfer mask.

Parameters:

mask - the chamfer mask to use for propagating distances

normalize - whether distance map should be normalized by the weight associated to orthogonal shifts

Method Detail

mask

public ChamferMask2D mask()

Description copied from interface: ChamferDistanceTransform2D

Return the chamfer mask used by this distance transform algorithm.

Specified by:

mask in interface ChamferDistanceTransform2D

Returns:

the chamfer mask used by this distance transform algorithm.

distanceMap

public ij.process.FloatProcessor distanceMap(ij.process.ImageProcessor binaryImage)

Computes the distance map of the distance to the nearest background pixel. The function returns a new instance of FloatProcessor the same size as the input, with values greater or equal to zero.

Specified by:

distanceMap in interface DistanceTransform

Parameters:

binaryImage - a binary image with black pixels (0) as background

Returns:

a new instance of FloatProcessor containing:

• 0 for each background pixel
• the (strictly positive) distance to the nearest background pixel otherwise