Package com.openstego.desktop.util

Class ImageUtil

java.lang.Object

com.openstego.desktop.util.ImageUtil

public class ImageUtil
extends Object

Image utilities

Field Summary

Fields

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

Method Summary

Modifier and Type	Method	Description
static ImageHolder	byteArrayToImage(byte[] imageData, String imgFileName)	Method to convert byte array to image
static void	cropImage(ImageHolder image, int cropWidth, int cropHeight)	Method crop an image to the given dimensions.
static ImageHolder	generateRandomImage(int numOfPixels)	Method to generate a random image filled with noise.
static ImageHolder	getDiffImage(ImageHolder leftImage, ImageHolder rightImage)	Method generate difference image between two given images
static BufferedImage	getImageFromRgb(List<int[][]> rgb)	Get image from given RGB data
static BufferedImage	getImageFromYuv(List<int[][]> yuv, int imgType)	Get image (with RGB data) from given YUV data
static List<int[][]>	getRgbFromImage(BufferedImage image)	Get RGB data array from given image
static List<int[][]>	getYuvFromImage(BufferedImage image)	Get YUV data from given image's RGB data
static byte[]	imageToByteArray(ImageHolder image, String imageFileName, OpenStegoPlugin<?> plugin)	Method to convert BufferedImage to byte array
static void	makeImageSquare(ImageHolder 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 final String DEFAULT_IMAGE_TYPE

Default image type in case not provided

See Also:

Constant Field Values

Method Detail

generateRandomImage

public static ImageHolder 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 - Processing issues

imageToByteArray

public static byte[] imageToByteArray(ImageHolder image,
                                      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 - Processing issues

byteArrayToImage

public static ImageHolder byteArrayToImage(byte[] imageData,
                                           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 - Processing issues

getRgbFromImage

public static List<int[][]> getRgbFromImage(BufferedImage image)

Get RGB data array from given image

Parameters:

image - Image

Returns:

List with three elements of two-dimensional int's - R, G and B

getYuvFromImage

public static List<int[][]> getYuvFromImage(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

getImageFromRgb

public static BufferedImage getImageFromRgb(List<int[][]> rgb)

Get image from given RGB data

Parameters:

rgb - List with three elements of two-dimensional int's - R, G and B

Returns:

Image

getImageFromYuv

public static BufferedImage getImageFromYuv(List<int[][]> yuv,
                                            int imgType)

Get image (with RGB data) from given YUV data

Parameters:

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

imgType - Type of image (e.g. BufferedImage.TYPE_INT_RGB)

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 void makeImageSquare(ImageHolder image)

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

Parameters:

image - Input image

cropImage

public static void cropImage(ImageHolder 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

getDiffImage

public static ImageHolder getDiffImage(ImageHolder leftImage,
                                       ImageHolder 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 - Processing issues