jjil.algorithm
Class Gray8Statistics

java.lang.Object
  jjil.algorithm.Gray8Statistics

public class Gray8Statistics
extends java.lang.Object

Gray8Statistics is used to measure the mean and variance of a gray image.

Author:

webb

Constructor Summary

Gray8Statistics()
Creates a new instance of Gray8Statistics

Method Summary

int	getMean() Return computed mean, times 256.
int	getStdDev() Return standard deviation, times 256 using Newton's iteration.
int	getVariance() Return computed variance, times 256.
void	push(Image image) Estimate the mean and variance of an input gray image.

Methods inherited from class java.lang.Object

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

Constructor Detail

Gray8Statistics

public Gray8Statistics()

Creates a new instance of Gray8Statistics

Method Detail

push

public void push(Image image)
          throws Error

Estimate the mean and variance of an input gray image.

Parameters:

image - the input image.

Throws:

Error - if the input image is not gray.

getMean

public int getMean()

Return computed mean, times 256.

Returns:

the mean value, times 256.

getStdDev

public int getStdDev()
              throws Error

Return standard deviation, times 256 using Newton's iteration.

Returns:

the standard deviation, times 256.

Throws:

Error - if the variance computed in push() is less than zero.

getVariance

public int getVariance()

Return computed variance, times 256.

Returns:

the computed variance value.