org.neuroph.imgrec

Class ImageUtilities

java.lang.Object

org.neuroph.imgrec.ImageUtilities

public class ImageUtilities
extends java.lang.Object

Contains various utility methods used for OCR.

Constructor Summary

Constructors

Constructor and Description
ImageUtilities()

Method Summary

Modifier and Type	Method and Description
static java.awt.image.BufferedImage	blackAndGrayCleaning(java.awt.image.BufferedImage image) This method cleans input image by replacing all pixels with RGB values from -4473925 (gray) to -1 (white) with white pixels and from -4473925 (gray) to -16777216 (black) with black pixels
static java.awt.image.BufferedImage	blackAndLightGrayCleaning(java.awt.image.BufferedImage image) This method cleans input image by replacing all pixels with RGB values from -3092272 (light gray) to -1 (white) with white pixels and from -3092272 (light gray) to -16777216 (black) with black pixels
static java.awt.image.BufferedImage	blackAndWhiteCleaning(java.awt.image.BufferedImage image) This method cleans input image by replacing all non black pixels with white pixels TODO: some should be used here
static java.awt.image.BufferedImage	colorCleaning(java.awt.image.BufferedImage image, int RGBcolor) This method cleans input image by replacing all pixels with RGB values from RGBcolor input (the input color) to -1 (white) with white pixels and from RGBcolor input (the input color) to -16777216 (black) with black pixels
static int	colorToRGB(int alpha, int red, int green, int blue)
static java.awt.image.BufferedImage	cropImage(java.awt.image.BufferedImage image, int x1, int y1, int x2, int y2) Crops (returns subimage) of specified input image at specified points.
static java.util.Map<java.lang.String,FractionRgbData>	getFractionRgbDataForImages(java.util.HashMap<java.lang.String,java.awt.image.BufferedImage> imagesData) Returns RGB data for all input images
static java.awt.image.BufferedImage	loadAndCleanImage(java.io.File file) This method loads the input Image and returns the cleaned version
static java.awt.image.BufferedImage	loadImage(java.io.File file) Loads image from the file.
static java.awt.image.BufferedImage	resizeImage(java.awt.image.BufferedImage image, int width, int height) Resize image to specified dimensions
static Image	resizeImage(Image image, int width, int height)
static void	save(java.awt.image.BufferedImage image, java.lang.String filename, java.lang.String type)
static java.awt.image.BufferedImage	trimImage(java.awt.image.BufferedImage imageToTrim) This method trims the input image and returns it as a BufferedImage

Methods inherited from class java.lang.Object

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

Constructor Detail

ImageUtilities

public ImageUtilities()

Method Detail

blackAndWhiteCleaning

public static java.awt.image.BufferedImage blackAndWhiteCleaning(java.awt.image.BufferedImage image)

This method cleans input image by replacing all non black pixels with white pixels TODO: some should be used here

Parameters:

image - - input image that will be cleaned

Returns:

- cleaned input image as BufferedImage

blackAndGrayCleaning

public static java.awt.image.BufferedImage blackAndGrayCleaning(java.awt.image.BufferedImage image)

This method cleans input image by replacing all pixels with RGB values from -4473925 (gray) to -1 (white) with white pixels and from -4473925 (gray) to -16777216 (black) with black pixels

Parameters:

image - - input image that will be cleaned

Returns:

- cleaned input image as BufferedImage

blackAndLightGrayCleaning

public static java.awt.image.BufferedImage blackAndLightGrayCleaning(java.awt.image.BufferedImage image)

This method cleans input image by replacing all pixels with RGB values from -3092272 (light gray) to -1 (white) with white pixels and from -3092272 (light gray) to -16777216 (black) with black pixels

Parameters:

image - - input image that will be cleaned

Returns:

- cleaned input image as BufferedImage

colorCleaning

public static java.awt.image.BufferedImage colorCleaning(java.awt.image.BufferedImage image,
                                                         int RGBcolor)

This method cleans input image by replacing all pixels with RGB values from RGBcolor input (the input color) to -1 (white) with white pixels and from RGBcolor input (the input color) to -16777216 (black) with black pixels

Parameters:

image - - input image that will be cleaned

RGBcolor - - input RGB value of wanted color as reference for celaning

Returns:

- cleaned input image as BufferedImage

loadAndCleanImage

public static java.awt.image.BufferedImage loadAndCleanImage(java.io.File file)

This method loads the input Image and returns the cleaned version

Parameters:

file - - input file that will be loaded as image

Returns:

- return cleaned loaded image as BufferedImage

loadImage

public static java.awt.image.BufferedImage loadImage(java.io.File file)

Loads image from the file.

Parameters:

file - image file

Returns:

loaded image

save

public static void save(java.awt.image.BufferedImage image,
                        java.lang.String filename,
                        java.lang.String type)

trimImage

public static java.awt.image.BufferedImage trimImage(java.awt.image.BufferedImage imageToTrim)

This method trims the input image and returns it as a BufferedImage

Parameters:

imageToTrim - input image that will be trimed

Returns:

return trimed input image as BufferedImage

resizeImage

public static java.awt.image.BufferedImage resizeImage(java.awt.image.BufferedImage image,
                                                       int width,
                                                       int height)

Resize image to specified dimensions

Parameters:

image - image to resize

width - new image width

height - new image height

Returns:

resized image

resizeImage

public static Image resizeImage(Image image,
                                int width,
                                int height)

cropImage

public static java.awt.image.BufferedImage cropImage(java.awt.image.BufferedImage image,
                                                     int x1,
                                                     int y1,
                                                     int x2,
                                                     int y2)

Crops (returns subimage) of specified input image at specified points.

Parameters:

image - image to crop

x1 - top left x coordinate

y1 - top left y coordinate

x2 - bottom right x coordinate

y2 - bottom right y coordinate

Returns:

image croped at specified points

getFractionRgbDataForImages

public static java.util.Map<java.lang.String,FractionRgbData> getFractionRgbDataForImages(java.util.HashMap<java.lang.String,java.awt.image.BufferedImage> imagesData)

Returns RGB data for all input images

Parameters:

imagesData - data map with characters as keys and charcter images as values

Returns:

data map with characters as keys and image rgb data as values

colorToRGB

public static int colorToRGB(int alpha,
                             int red,
                             int green,
                             int blue)