I want to add a button to take snapshot of the video. How can I achieve this????

[Anonymous]

My requirement is to save a snapshot of a video when I click on a button name "Take Snapshot". Please guide me how to implement this.

[Jonathon Hare]

This example should get you going:

package org.openimaj.examples.video;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

import org.openimaj.image.ImageUtilities;
import org.openimaj.image.MBFImage;
import org.openimaj.video.Video;
import org.openimaj.video.VideoDisplay;
import org.openimaj.video.capture.VideoCapture;

/**
 * Example showing how to play a video and save single frame snapshots on a
 * button-press.
 * 
 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
 * 
 */
public class VideoSnapshotExample {
    private static void createUI(final Video<MBFImage> video) {
        // create the window
        final JFrame frame = new JFrame("Snapshot Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // setup the video
        final JPanel videoPanel = new JPanel();
        final VideoDisplay<MBFImage> display = VideoDisplay.createVideoDisplay(video, videoPanel);
        frame.add(videoPanel, BorderLayout.CENTER);

        // add the button
        final JButton button = new JButton("Take Snapshot");
        final String SNAPSHOT_COMMAND = "snapshot";
        button.setActionCommand(SNAPSHOT_COMMAND);
        frame.getContentPane().add(button, BorderLayout.SOUTH);
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent evt) {
                if (evt.getActionCommand() == SNAPSHOT_COMMAND) {
                    // this gets called if the button is pressed

                    // pause the video
                    display.setMode(VideoDisplay.Mode.PAUSE);

                    // display a file save dialog
                    final JFileChooser saveFile = new JFileChooser();
                    if (saveFile.showSaveDialog(frame) == JFileChooser.APPROVE_OPTION) {
                        // if a file was selected write the image
                        try {
                            // we're just going to add .jpg to the filename and
                            // save it... should be much more intelligent here
                            // in reality...
                            File outfile = saveFile.getSelectedFile();
                            outfile = new File(outfile.getParentFile(), outfile.getName() + ".jpg");

                            ImageUtilities.write(video.getCurrentFrame(), outfile);
                        } catch (final IOException ioe) {
                            // display an error if the file couldn't be saved
                            JOptionPane.showMessageDialog(null, "Unable to save file.");
                        }
                    }

                    // start the video playing again
                    display.setMode(VideoDisplay.Mode.PLAY);
                }
            }
        });

        // prepare the window for display
        frame.pack();

        // and display it
        frame.setVisible(true);
    }

    /**
     * Run the example
     * 
     * @param args
     */
    public static void main(String[] args) {
        try {
            // Open the video. Here we're using the default webcam, but this
            // could
            // be any type of video, such as a XuggleVideo which reads from a
            // file.
            final Video<MBFImage> video = new VideoCapture(320, 240);

            // create and display the UI
            createUI(video);
        } catch (final IOException e) {
            // an error occured
            JOptionPane.showMessageDialog(null, "Unable to open video.");
        }
    }
}