net.sourceforge.tess4j.util

Class ImageHelper

java.lang.Object

net.sourceforge.tess4j.util.ImageHelper

public class ImageHelper
extends java.lang.Object

Common image processing routines.

Constructor Summary

Constructors

Constructor and Description
ImageHelper()

Method Summary

Modifier and Type	Method and Description
static java.awt.image.BufferedImage	cloneImage(java.awt.image.BufferedImage bi) Clones an image.
static java.awt.image.BufferedImage	convertImage2Binary(java.awt.image.BufferedImage image) Deprecated. As of release 1.1, renamed to convertImageToBinary(BufferedImage image)
static java.awt.image.BufferedImage	convertImageToBinary(java.awt.image.BufferedImage image) A simple method to convert an image to binary or B/W image.
static java.awt.image.BufferedImage	convertImageToGrayscale(java.awt.image.BufferedImage image) A simple method to convert an image to gray scale.
static java.awt.Image	getClipboardImage() Gets an image from Clipboard.
static java.awt.image.BufferedImage	getScaledInstance(java.awt.image.BufferedImage image, int targetWidth, int targetHeight) Convenience method that returns a scaled instance of the provided BufferedImage.
static javax.imageio.IIOImage	getScaledInstance(javax.imageio.IIOImage iioSource, float scale) Convenience method that returns a scaled instance of the provided IIOImage.
static java.awt.image.BufferedImage	getSubImage(java.awt.image.BufferedImage image, int x, int y, int width, int height) A replacement for the standard BufferedImage.getSubimage method.
static java.awt.image.BufferedImage	invertImageColor(java.awt.image.BufferedImage image) Inverts image color.
static java.awt.image.BufferedImage	rotateImage(java.awt.image.BufferedImage image, double angle) Rotates an image.

Methods inherited from class java.lang.Object

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

Constructor Detail

ImageHelper

public ImageHelper()

Method Detail

getScaledInstance

public static java.awt.image.BufferedImage getScaledInstance(java.awt.image.BufferedImage image,
                                                             int targetWidth,
                                                             int targetHeight)

Convenience method that returns a scaled instance of the provided BufferedImage.

Parameters:

image - the original image to be scaled

targetWidth - the desired width of the scaled instance, in pixels

targetHeight - the desired height of the scaled instance, in pixels

Returns:

a scaled version of the original BufferedImage

getScaledInstance

public static javax.imageio.IIOImage getScaledInstance(javax.imageio.IIOImage iioSource,
                                                       float scale)

Convenience method that returns a scaled instance of the provided IIOImage.

Parameters:

iioSource - the original image to be scaled

scale - the desired scale

Returns:

a scaled version of the original IIOImage

getSubImage

public static java.awt.image.BufferedImage getSubImage(java.awt.image.BufferedImage image,
                                                       int x,
                                                       int y,
                                                       int width,
                                                       int height)

A replacement for the standard BufferedImage.getSubimage method.

Parameters:

image -

x - the X coordinate of the upper-left corner of the specified rectangular region

y - the Y coordinate of the upper-left corner of the specified rectangular region

width - the width of the specified rectangular region

height - the height of the specified rectangular region

Returns:

a BufferedImage that is the subimage of image.

convertImageToBinary

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

A simple method to convert an image to binary or B/W image.

Parameters:

image - input image

Returns:

a monochrome image

convertImage2Binary

@Deprecated
public static java.awt.image.BufferedImage convertImage2Binary(java.awt.image.BufferedImage image)

Deprecated. As of release 1.1, renamed to convertImageToBinary(BufferedImage image)

A simple method to convert an image to binary or B/W image.

Parameters:

image - input image

Returns:

a monochrome image

convertImageToGrayscale

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

A simple method to convert an image to gray scale.

Parameters:

image - input image

Returns:

a monochrome image

invertImageColor

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

Inverts image color.

Parameters:

image - input image

Returns:

an inverted-color image

rotateImage

public static java.awt.image.BufferedImage rotateImage(java.awt.image.BufferedImage image,
                                                       double angle)

Rotates an image.

Parameters:

image - the original image

angle - the degree of rotation

Returns:

a rotated image

getClipboardImage

public static java.awt.Image getClipboardImage()

Gets an image from Clipboard.

Returns:

image

cloneImage

public static java.awt.image.BufferedImage cloneImage(java.awt.image.BufferedImage bi)

Clones an image. http://stackoverflow.com/questions/3514158/how-do-you-clone-a-bufferedimage

Parameters:

bi -

Returns: