net.sourceforge.openstego.util

Class ImageUtil

java.lang.Object

net.sourceforge.openstego.util.ImageUtil

public class ImageUtil
extends java.lang.Object

Image utilities

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	DEFAULT_IMAGE_TYPE Default image type in case not provided

Method Summary

Modifier and Type	Method and Description
static java.awt.image.BufferedImage	byteArrayToImage(byte[] imageData, java.lang.String imgFileName) Method to convert byte array to image
static java.awt.image.BufferedImage	cropImage(java.awt.image.BufferedImage image, int cropWidth, int cropHeight) Method crop an image to the given dimensions.
static java.awt.image.BufferedImage	generateRandomImage(int numOfPixels) Method to generate a random image filled with noise.
static java.awt.image.BufferedImage	getDiffImage(java.awt.image.BufferedImage leftImage, java.awt.image.BufferedImage rightImage) Method generate difference image between two given images
static java.awt.image.BufferedImage	getImageFromYuv(java.util.ArrayList yuv) Get image (with RGB data) from given YUV data
static java.util.ArrayList	getYuvFromImage(java.awt.image.BufferedImage image) Get YUV data from given image's RGB data
static byte[]	imageToByteArray(java.awt.image.BufferedImage image, java.lang.String imageFileName, OpenStegoPlugin plugin) Method to convert BufferedImage to byte array
static java.awt.image.BufferedImage	makeImageSquare(java.awt.image.BufferedImage image) Method to pad an image such that it becomes perfect square.
static int	pixelRange(double p) Utility method to limit the value within [0,255] range
static int	pixelRange(int p) Utility method to limit the value within [0,255] range

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_IMAGE_TYPE

public static java.lang.String DEFAULT_IMAGE_TYPE

Default image type in case not provided

Method Detail

generateRandomImage

public static java.awt.image.BufferedImage generateRandomImage(int numOfPixels)
                                                        throws OpenStegoException

Method to generate a random image filled with noise.

Parameters:

numOfPixels - Number of pixels required in the image

Returns:

Random image filled with noise

Throws:

OpenStegoException

imageToByteArray

public static byte[] imageToByteArray(java.awt.image.BufferedImage image,
                                      java.lang.String imageFileName,
                                      OpenStegoPlugin plugin)
                               throws OpenStegoException

Method to convert BufferedImage to byte array

Parameters:

image - Image data

imageFileName - Name of the image file

plugin - Reference to the plugin

Returns:

Image data as byte array

Throws:

OpenStegoException

byteArrayToImage

public static java.awt.image.BufferedImage byteArrayToImage(byte[] imageData,
                                                            java.lang.String imgFileName)
                                                     throws OpenStegoException

Method to convert byte array to image

Parameters:

imageData - Image data as byte array

imgFileName - Name of the image file

Returns:

Buffered image

Throws:

OpenStegoException

getYuvFromImage

public static java.util.ArrayList getYuvFromImage(java.awt.image.BufferedImage image)

Get YUV data from given image's RGB data

Parameters:

image - Image

Returns:

List with three elements of two-dimensional int's - Y, U and V

getImageFromYuv

public static java.awt.image.BufferedImage getImageFromYuv(java.util.ArrayList yuv)

Get image (with RGB data) from given YUV data

Parameters:

yuv - List with three elements of two-dimensional int's - Y, U and V

Returns:

Image

pixelRange

public static int pixelRange(int p)

Utility method to limit the value within [0,255] range

Parameters:

p - Input value

Returns:

Limited value

pixelRange

public static int pixelRange(double p)

Utility method to limit the value within [0,255] range

Parameters:

p - Input value

Returns:

Limited value

makeImageSquare

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

Method to pad an image such that it becomes perfect square. The padding uses black color

Parameters:

image - Input image

Returns:

Image with square dimensions

cropImage

public static java.awt.image.BufferedImage cropImage(java.awt.image.BufferedImage image,
                                                     int cropWidth,
                                                     int cropHeight)

Method crop an image to the given dimensions. If dimensions are more than the input image size, then the image gets padded with black color

Parameters:

image - Input image

cropWidth - Width required for cropped image

cropHeight - Height required for cropped image

Returns:

Cropped image

getDiffImage

public static java.awt.image.BufferedImage getDiffImage(java.awt.image.BufferedImage leftImage,
                                                        java.awt.image.BufferedImage rightImage)
                                                 throws OpenStegoException

Method generate difference image between two given images

Parameters:

leftImage - Left input image

rightImage - Right input image

Returns:

Difference image

Throws:

OpenStegoException