Package adams.data.image.moments

Class MomentHelper

java.lang.Object

adams.data.image.moments.MomentHelper

public class MomentHelper
extends Object

Implements Image Moments for use in feature generation Only implemented for binary images For all boolean matrices the expected format is boolean[height][width]

Version:

$Revision$

Author:

sjb90

Constructor Summary

Constructors

Constructor	Description
MomentHelper()

Method Summary

Modifier and Type	Method	Description
static double	centralMoment(boolean[][] img, int p, int q)	Computes the central moment.
static double	eccentricity(boolean[][] img)	Measures the eccentricity of an object.
static List<Double>	husMoments(boolean[][] img)	Computes Hu's moments.
static void	main(String[] args)	Just for testing.
static double	majorAxisDirection(boolean[][] img)	Computes the orientation of the major axis.
static double	moment(boolean[][] img, int p, int q)	Computes the moment.
static double	normalCentralMoment(boolean[][] img, int p, int q)	Computes the (normal) central moment.
static List<Double>	orientationVector(boolean[][] img)	Computes the orientation vector.

Methods inherited from class java.lang.Object

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

Constructor Detail

MomentHelper

public MomentHelper()

Method Detail

moment

public static double moment(boolean[][] img,
                            int p,
                            int q)

Computes the moment.

Parameters:

img - the matrix

p - the p parameter, exponent for x

q - the q parameter, exponent for y

Returns:

the moment

centralMoment

public static double centralMoment(boolean[][] img,
                                   int p,
                                   int q)

Computes the central moment. See here

Parameters:

img - the matrix

p - the p parameter, exponent for x

q - the q parameter, exponent for y

Returns:

the moment

normalCentralMoment

public static double normalCentralMoment(boolean[][] img,
                                         int p,
                                         int q)

Computes the (normal) central moment.

Parameters:

img - the matrix

p - the p parameter, exponent for x

q - the q parameter, exponent for y

Returns:

the moment

See Also:

centralMoment(boolean[][], int, int)

majorAxisDirection

public static double majorAxisDirection(boolean[][] img)

Computes the orientation of the major axis.

Parameters:

img - the matrix

Returns:

the orientation

orientationVector

public static List<Double> orientationVector(boolean[][] img)

Computes the orientation vector.

Parameters:

img - the matrix

Returns:

the orientation (x, y)

eccentricity

public static double eccentricity(boolean[][] img)

Measures the eccentricity of an object. A value of 1 is for a round object and the value can range from 1 to infinity.

Parameters:

img - the matrix

Returns:

the eccentricity of the object

husMoments

public static List<Double> husMoments(boolean[][] img)

Computes Hu's moments.

Parameters:

img - the matrix to use

Returns:

the moments (1-7)

main

public static void main(String[] args)

Just for testing.

Parameters:

args - ignored