Solved

How to compare 2 images using java

Posted on 2009-07-13
7
3,213 Views
Last Modified: 2013-11-23
How to compare two images are same or not using java.
0
Comment
Question by:Vineel_Davuluri
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
7 Comments
 
LVL 92

Accepted Solution

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

0
 
LVL 92

Assisted Solution

by:objects
objects earned 500 total points
ID: 24838350
0
 
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.
0
 
LVL 2

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();
}

Open in new window

0
 
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;
	}
}

Open in new window

0

Featured Post

Get 15 Days FREE Full-Featured Trial

Benefit from a mission critical IT monitoring with Monitis Premium or get it FREE for your entry level monitoring needs.
-Over 200,000 users
-More than 300,000 websites monitored
-Used in 197 countries
-Recommended by 98% of users

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
Viewers will learn about arithmetic and Boolean expressions in Java and the logical operators used to create Boolean expressions. We will cover the symbols used for arithmetic expressions and define each logical operator and how to use them in Boole…
The viewer will learn how to synchronize PHP projects with a remote server in NetBeans IDE 8.0 for Windows.
Suggested Courses

630 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question