net.sf.javaocr.demos.android.utils.image
Class SauvolaImageProcessor

java.lang.Object
  net.sf.javaocr.demos.android.utils.image.SauvolaImageProcessor

All Implemented Interfaces:

ImageProcessor

public class SauvolaImageProcessor
extends Object
implements ImageProcessor

process image with median and Sauvola filter. image supplied for processing shall be of sufficient size to accomodate image region specified on creation

Author:

Konstantin Pribluda

Field Summary

(package private) int	arrayHeight
(package private) int	arrayWidth
(package private) int	h
static int	MEDIAN_WINDOW
(package private) PixelImage	processImage
(package private) PixelImage	returnImage
private static double	SAUVOLA_WEIGHT
static int	SAUVOLA_WINDOW
private SauvolaBinarisationFilter	sauvolaBinarisationFilter
(package private) int	w

Constructor Summary

SauvolaImageProcessor(int arrayWidth, int arrayHeight, int w, int h, int above, int below)
create image processor working over region of supplied image.

Method Summary

PixelImage

prepareImage(byte[] image, int offsetX, int offsetY) process incoming image

Methods inherited from class java.lang.Object

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

Field Detail

SAUVOLA_WINDOW

public static final int SAUVOLA_WINDOW

See Also:

Constant Field Values

MEDIAN_WINDOW

public static final int MEDIAN_WINDOW

See Also:

Constant Field Values

SAUVOLA_WEIGHT

private static final double SAUVOLA_WEIGHT

See Also:

Constant Field Values

w

final int w

h

final int h

arrayWidth

final int arrayWidth

arrayHeight

final int arrayHeight

processImage

PixelImage processImage

returnImage

PixelImage returnImage

sauvolaBinarisationFilter

private SauvolaBinarisationFilter sauvolaBinarisationFilter

Constructor Detail

SauvolaImageProcessor

public SauvolaImageProcessor(int arrayWidth,
                             int arrayHeight,
                             int w,
                             int h,
                             int above,
                             int below)

create image processor working over region of supplied image. take care in specifying offsets - window size applies to them

Parameters:

w - width of region of interest

h - height of region of interest

above - value for pixels above threshold

below - value for pixels below threshold

Method Detail

prepareImage

public PixelImage prepareImage(byte[] image,
                               int offsetX,
                               int offsetY)

process incoming image

Specified by:

prepareImage in interface ImageProcessor

Parameters:

image - incoming image. may be modified

offsetX - region of interest offset. this data is not available at creation time

offsetY - region of interest offset. this data is not available at creation time

Returns:

processed image