net.sourceforge.javaocr.filter
Class MedianFilter

java.lang.Object
  net.sourceforge.javaocr.filter.MedianFilter

All Implemented Interfaces:

ImageFilter

Direct Known Subclasses:

SauvolaBinarisationFilter

public class MedianFilter
extends Object
implements ImageFilter

applies median filter to image (pixel is Mx from his surrounding window) result is collected in destination image. Pixels outside source image are treated as non existing. Border pixels are considered invalid, and their treatment is upon user

Field Summary

protected Image	destination
protected int	halfWindow
protected IntegralImageFilter	integralImageFilter
private PixelImage	meanImage
protected int	squareWindow

Constructor Summary

MedianFilter(Image destination, int window)
create median filter

Method Summary

protected int	computePixel(Image image, int y, int x) compute median pixel value
int	getHalfWindow()
IntegralImageFilter	getIntegralImageFilter()
int	getSquareWindow()
void	process(Image image) perform image processing possibly overwriting the image with the result

Methods inherited from class java.lang.Object

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

Field Detail

destination

protected final Image destination

halfWindow

protected final int halfWindow

squareWindow

protected final int squareWindow

meanImage

private final PixelImage meanImage

integralImageFilter

protected final IntegralImageFilter integralImageFilter

Constructor Detail

MedianFilter

public MedianFilter(Image destination,
                    int window)

create median filter

Parameters:

destination - overscan image where result is collected.

window - window size, in case of even value will be treated as one less

Method Detail

process

public void process(Image image)

Description copied from interface: ImageFilter

perform image processing possibly overwriting the image with the result

Specified by:

process in interface ImageFilter

computePixel

protected int computePixel(Image image,
                           int y,
                           int x)

compute median pixel value

getHalfWindow

public int getHalfWindow()

getSquareWindow

public int getSquareWindow()

getIntegralImageFilter

public IntegralImageFilter getIntegralImageFilter()