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How to compare 2 images using java

Posted on 2009-07-13
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Last Modified: 2013-11-23
How to compare two images are same or not using java.
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Question by:Vineel_Davuluri
7 Comments
 
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Accepted Solution

by:
objects earned 500 total points
ID: 24838336
compare the two source byte arrays

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Assisted Solution

by:objects
objects earned 500 total points
ID: 24838350
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LVL 20

Expert Comment

by:a_b
ID: 24838458
You need to convert the file into a byte array and then compare those byte arrays.
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Expert Comment

by:nkiggs
ID: 24838815
You'll need to import the following libraries:

import java.awt.Image;
import java.awt.Toolkit;
import java.awt.image.PixelGrabber;


String file1 = "pic1.png";

String file2 = "pic2.png";
 

Image image1 = Toolkit.getDefaultToolkit().getImage(file1);

Image image2 = Toolkit.getDefaultToolkit().getImage(file2);
 

try{
 

	PixelGrabber grab1 =

	new PixelGrabber(image1, 0, 0, -1, -1, false);

	PixelGrabber grab2 =

	new PixelGrabber(image2, 0, 0, -1, -1, false);
 

	int[] data1 = null;

	if (grab1.grabPixels()) {

		int width = grab1.getWidth();

		int height = grab1.getHeight();

		data1 = new int[width * height];

		data1 = (int[]) grab1.getPixels();

	}
 

	int[] data2 = null;

	if (grab2.grabPixels()) {

		int width = grab2.getWidth();

		int height = grab2.getHeight();

		data2 = new int[width * height];

		data2 = (int[]) grab2.getPixels();

	}
 

	System.out.println("Are they equal?: " + java.util.Arrays.equals(data1, data2));

} 

catch (InterruptedException e1) {

	e1.printStackTrace();

}

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LVL 17

Expert Comment

by:Thomas4019
ID: 24841958
I would use this code
import java.io.File;

import java.awt.image.*;

import javax.imageio.*;
 

class Test

{

	public boolean imagesEqual(File f1,File f2)

	{

		BufferedImage i1,i2;
 

		try

		{

			i1 = ImageIO.read(f1);

			i2 = ImageIO.read(f2);

		}

		catch(Exception e){ e.printStackTrace(); return false; }
 

		if(i1.getWidth() != i2.getWidth() || i1.getHeight() != i2.getHeight())

			return false;
 

		for(int x = 0; x < i1.getWidth(); x++)

			for(int y = 0; y < i1.getWidth(); y++)

				if(i1.getRGB(x,y) != i2.getRGB(x,y))

					return false;
 

		return true;

	}

}

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