Package de.hsh.graja.util

Class ImageUtils

java.lang.Object

de.hsh.graja.util.ImageUtils

public class ImageUtils
extends Object

Constructor Summary

Constructors

Constructor	Description
ImageUtils()

Method Summary

Modifier and Type	Method	Description
static BufferedImage	calcDiffImage(BufferedImage img1, BufferedImage img2)	calculate an image with differences in gray scales.
static int	countDiffPixels(BufferedImage image1, BufferedImage image2)	Counts number of pixels that differ between the two images.
static BufferedImage	createBufferedImage(int width, int height, Color background)	Creates a memory buffer for a buffered image.
static BufferedImage	createBufferedImage(String base64Data, int width, int height, int imageType)	Creates a buffered image from base64 encoded bytes.

Methods inherited from class java.lang.Object

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

Constructor Detail

ImageUtils

public ImageUtils()

Method Detail

createBufferedImage

public static BufferedImage createBufferedImage(int width,
                                                int height,
                                                Color background)

Creates a memory buffer for a buffered image. In order to write pixels to the image you will have to do:

      int[] pixels = ((DataBufferInt) diff.getRaster().getDataBuffer()).getData();
      pixels[x+width*y]= new Color(r,g,b).getRGB();
 

Parameters:

width -

height -

background -

createBufferedImage

public static BufferedImage createBufferedImage(String base64Data,
                                                int width,
                                                int height,
                                                int imageType)
                                         throws IOException

Creates a buffered image from base64 encoded bytes.

Parameters:

width -

height -

imageType -

Throws:

IOException

countDiffPixels

public static int countDiffPixels(BufferedImage image1,
                                  BufferedImage image2)

Counts number of pixels that differ between the two images.

Parameters:

image1 -

image2 -

calcDiffImage

public static BufferedImage calcDiffImage(BufferedImage img1,
                                          BufferedImage img2)
                                   throws IllegalArgumentException

calculate an image with differences in gray scales. Both images must have equal sizes. The difference is calculate as a gray scale of the DeltaE (CIE76) metric, applied directly in the RGB space.

Parameters:

img1 -

img2 -

Throws:

IllegalArgumentException - thrown, when the images' sizes do not match.