checking pixel Identical

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Java

image-processing

i am checking pixel similarity
original image is-http://puu.sh/5xEyy[^]
image can be split into four different parts
each part is different
code for split image

package testing1;;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
public class imagesplit {
	BufferedImage img;
	static BufferedImage img1;
	static BufferedImage img2;
	static BufferedImage img3;
	static BufferedImage img4;
	public static void main(String[] args) throws IOException {
		BufferedImage img=ImageIO.read(new File("paint1.png"));
		int height=img.getHeight()/2;
		int width=img.getWidth()/2;
		img1=img.getSubimage(0, 0, height, width);
		ImageIO.write(img1, "png", new File("out1.png"));
		img2=img.getSubimage(width, 0, height, width);
		ImageIO.write(img2, "png", new File("out2.png"));
		img3=img.getSubimage(0, height, height, width);
		ImageIO.write(img3, "png", new File("out3.png"));
		img4=img.getSubimage(width, height, width, height);
		ImageIO.write(img4, "png", new File("out4.png"));
		}
	
	}

I want to check group of pixel similarity means i want to match part1,part2,part3,part4 only road pixel if pixel match then display image.