Catalano.Math.Functions

Class Gaussian

java.lang.Object

Catalano.Math.Functions.Gaussian

public class Gaussian
extends java.lang.Object

Gaussian function.
The class is used to calculate 1D and 2D Gaussian functions for specified Sigma (s) value:

1-D: f(x) = exp( x * x / ( -2 * s * s ) ) / ( s * sqrt( 2 * PI ) )

2-D: f(x, y) = exp( x * x + y * y / ( -2 * s * s ) ) / ( s * s * 2 * PI )

Constructor Summary

Constructors

Constructor and Description
Gaussian(double sigma) Initializes a new instance of the Gaussian class.

Method Summary

Modifier and Type	Method and Description
double	Function1D(double x) 1-D Gaussian function.
double	Function2D(double x, double y) 2-D Gaussian function.
double	getSigma() Sigma value.
double[]	Kernel1D(int size) 1-D Gaussian kernel.
double[][]	Kernel2D(int size) 2-D Gaussian kernel.
void	setSigma(double sigma) Sigma value.

Methods inherited from class java.lang.Object

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

Constructor Detail

Gaussian

public Gaussian(double sigma)

Initializes a new instance of the Gaussian class.

Parameters:

sigma - Sigma value.

Method Detail

getSigma

public double getSigma()

Sigma value.

Returns:

Sigma value.

setSigma

public void setSigma(double sigma)

Sigma value.
Default value is set to 1. Minimum allowed value is 0.00000001.

Parameters:

sigma - Sigma value.

Function1D

public double Function1D(double x)

1-D Gaussian function.

Parameters:

x - value.

Returns:

Function's value at point x.

Function2D

public double Function2D(double x,
                         double y)

2-D Gaussian function.

Parameters:

x - value.

y - value.

Returns:

Function's value at point (x,y).

Kernel1D

public double[] Kernel1D(int size)

1-D Gaussian kernel.

Parameters:

size - Kernel size (should be odd), [3, 101].

Returns:

Returns 1-D Gaussian kernel of the specified size.

Kernel2D

public double[][] Kernel2D(int size)

2-D Gaussian kernel.

Parameters:

size - Kernel size (should be odd), [3, 101].

Returns:

Returns 2-D Gaussian kernel of specified size.