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How to compare two images using Java OpenCV library?
To compare two images −
Read Both of them using the Image.IO.read() method.
Get the height and width of both of them to make sure they are equal.
Get the pixel values and, get the RGB values of both of the images.
Get the sum of the differences between the RGB values of these two images.
Calculate the percentage of the difference using the following formula −
Average = difference/weight*height*3; Percentage = (Average/255)*100;
Example
import java.awt.Color;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import java.io.File;
public class ComparingImages {
public static void main(String[] args) throws Exception {
BufferedImage img1 = ImageIO.read(new File("D:\Images\test1.jpg"));
BufferedImage img2 = ImageIO.read(new File("D:\Images\test2.jpg"));
int w1 = img1.getWidth();
int w2 = img2.getWidth();
int h1 = img1.getHeight();
int h2 = img2.getHeight();
if ((w1!=w2)||(h1!=h2)) {
System.out.println("Both images should have same dimwnsions");
} else {
long diff = 0;
for (int j = 0; j < h1; j++) {
for (int i = 0; i < w1; i++) {
//Getting the RGB values of a pixel
int pixel1 = img1.getRGB(i, j);
Color color1 = new Color(pixel1, true);
int r1 = color1.getRed();
int g1 = color1.getGreen();
int b1 = color1.getBlue();
int pixel2 = img2.getRGB(i, j);
Color color2 = new Color(pixel2, true);
int r2 = color2.getRed();
int g2 = color2.getGreen();
int b2= color2.getBlue();
//sum of differences of RGB values of the two images
long data = Math.abs(r1-r2)+Math.abs(g1-g2)+ Math.abs(b1-b2);
diff = diff+data;
}
}
double avg = diff/(w1*h1*3);
double percentage = (avg/255)*100;
System.out.println("Difference: "+percentage);
}
}
}Input1
Input2
Output
Difference: 92.54901960784314
Updated on: 09-Apr-2020
5K+ Views
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