Detect Day or Night from Image Java

          Java provides few inbuilt classes for view, edit and manage images. This is very simple program to detect an image is taken day or night.

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import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GraphicsEnvironment;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
/*

    Coded By Ajith Kp (c) http://TerminalCoders.BlogSpot.in (c)
*/
public class DayNight extends JFrame {
    JButton openB = new JButton("Open");
    JPanel imagePanel = new JPanel();
    JPanel menuPanel = new JPanel();
    DayNight()
    {
        super("DayNight Detector Java By Ajith Kp [ ajithklp560 ");
        GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
        setMaximizedBounds(env.getMaximumWindowBounds());
        setExtendedState(getExtendedState() | MAXIMIZED_BOTH);
        openB.addActionListener(new ActionListener(){
            @Override
            public void actionPerformed(ActionEvent e) {
                JFileChooser fc = new JFileChooser();
                int returnVal = fc.showOpenDialog(DayNight.this);
                if (returnVal == JFileChooser.APPROVE_OPTION) {
                    try {
                        File imgf = fc.getSelectedFile();
                        imagePanel.removeAll();
                        setPic(imgf);
                    } catch (IOException ex) {
                    }
                }
            }
        });
        menuPanel.add(openB);
        add(menuPanel, BorderLayout.NORTH);
        add(imagePanel, BorderLayout.CENTER);
    }
    public void setPic(File imgf) throws IOException
    {
        BufferedImage myImg = ImageIO.read(imgf);
        int w = myImg.getWidth();
        int h = myImg.getHeight();
        
        JLabel picLabel = new JLabel(new ImageIcon(myImg));
        imagePanel.add(picLabel);
        imagePanel.revalidate();
        imagePanel.repaint();
        
        double sr = 0, sg = 0, sb = 0;
        double R, G, B;
        int len = w*h;
        for(int i=0;i<w;i++)
        {
            for(int j=0;j<h;j++)
            {
                Color c = new Color(myImg.getRGB(i, j));
                sr+=c.getRed();
                sg+=c.getGreen();
                sb+=c.getBlue();
            }
        }
        sr = (sr/len)/255.0;
        sg = (sg/len)/255.0;
        sb = (sg/len)/255.0;
        if(sr <= 0.03928)
        {
            R = sr/12.92;
        }
        else
        {
            R = Math.pow((sr+0.055)/1.055, 2.4);
        }
        if(sg <= 0.03928)
        {
            G = sg/12.92;
        }
        else
        {
            G = Math.pow((sg+0.055)/1.055, 2.4);
        }
        if(sb <= 0.03928)
        {
            B = sb/12.92;
        }
        else
        {
            B = Math.pow((sb+0.055)/1.055, 2.4);
        }
        double y = 0.2126*R+0.7152*G+0.0722*B;
        if(y<0.07)
        {
            JOptionPane.showMessageDialog(null, "Night Photo", "Day Or Night", JOptionPane.INFORMATION_MESSAGE);
        }
        else
        {
            JOptionPane.showMessageDialog(null, "Day Photo", "Day Or Night", JOptionPane.INFORMATION_MESSAGE);
        }
    }
    public static void main(String[] args) {
        // TODO code application logic here
        DayNight dn = new DayNight();
        dn.setSize(700, 500);
        dn.setVisible(true);
        dn.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    
}