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Open Source Computer Vision Library
https://opencv.org/
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145 lines
4.9 KiB
145 lines
4.9 KiB
7 years ago
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import java.awt.BorderLayout;
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import java.awt.Container;
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import java.awt.Image;
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import javax.swing.BoxLayout;
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import javax.swing.ImageIcon;
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import javax.swing.JFrame;
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import javax.swing.JLabel;
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import javax.swing.JPanel;
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import javax.swing.JSlider;
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import javax.swing.event.ChangeEvent;
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import javax.swing.event.ChangeListener;
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import org.opencv.core.Core;
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import org.opencv.core.Mat;
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import org.opencv.highgui.HighGui;
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import org.opencv.imgcodecs.Imgcodecs;
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import org.opencv.imgproc.Imgproc;
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public class Threshold {
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private static int MAX_VALUE = 255;
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private static int MAX_TYPE = 4;
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private static int MAX_BINARY_VALUE = 255;
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private static final String WINDOW_NAME = "Threshold Demo";
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private static final String TRACKBAR_TYPE = "<html><body>Type: <br> 0: Binary <br> "
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+ "1: Binary Inverted <br> 2: Truncate <br> "
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+ "3: To Zero <br> 4: To Zero Inverted</body></html>";
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private static final String TRACKBAR_VALUE = "Value";
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private int thresholdValue = 0;
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private int thresholdType = 3;
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private Mat src;
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private Mat srcGray = new Mat();
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private Mat dst = new Mat();
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private JFrame frame;
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private JLabel imgLabel;
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public Threshold(String[] args) {
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//! [load]
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String imagePath = "../data/stuff.jpg";
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if (args.length > 0) {
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imagePath = args[0];
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}
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// Load an image
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src = Imgcodecs.imread(imagePath);
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if (src.empty()) {
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System.out.println("Empty image: " + imagePath);
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System.exit(0);
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}
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// Convert the image to Gray
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Imgproc.cvtColor(src, srcGray, Imgproc.COLOR_BGR2GRAY);
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//! [load]
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//! [window]
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// Create and set up the window.
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frame = new JFrame(WINDOW_NAME);
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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// Set up the content pane.
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Image img = HighGui.toBufferedImage(srcGray);
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addComponentsToPane(frame.getContentPane(), img);
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// Use the content pane's default BorderLayout. No need for
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// setLayout(new BorderLayout());
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// Display the window.
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frame.pack();
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frame.setVisible(true);
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//! [window]
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}
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private void addComponentsToPane(Container pane, Image img) {
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if (!(pane.getLayout() instanceof BorderLayout)) {
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pane.add(new JLabel("Container doesn't use BorderLayout!"));
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return;
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}
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JPanel sliderPanel = new JPanel();
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sliderPanel.setLayout(new BoxLayout(sliderPanel, BoxLayout.PAGE_AXIS));
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//! [trackbar]
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sliderPanel.add(new JLabel(TRACKBAR_TYPE));
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// Create Trackbar to choose type of Threshold
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JSlider sliderThreshType = new JSlider(0, MAX_TYPE, thresholdType);
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sliderThreshType.setMajorTickSpacing(1);
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sliderThreshType.setMinorTickSpacing(1);
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sliderThreshType.setPaintTicks(true);
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sliderThreshType.setPaintLabels(true);
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sliderPanel.add(sliderThreshType);
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sliderPanel.add(new JLabel(TRACKBAR_VALUE));
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// Create Trackbar to choose Threshold value
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JSlider sliderThreshValue = new JSlider(0, MAX_VALUE, 0);
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sliderThreshValue.setMajorTickSpacing(50);
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sliderThreshValue.setMinorTickSpacing(10);
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sliderThreshValue.setPaintTicks(true);
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sliderThreshValue.setPaintLabels(true);
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sliderPanel.add(sliderThreshValue);
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//! [trackbar]
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//! [on_trackbar]
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sliderThreshType.addChangeListener(new ChangeListener() {
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@Override
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public void stateChanged(ChangeEvent e) {
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JSlider source = (JSlider) e.getSource();
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thresholdType = source.getValue();
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update();
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}
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});
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sliderThreshValue.addChangeListener(new ChangeListener() {
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@Override
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public void stateChanged(ChangeEvent e) {
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JSlider source = (JSlider) e.getSource();
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thresholdValue = source.getValue();
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update();
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}
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});
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//! [on_trackbar]
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pane.add(sliderPanel, BorderLayout.PAGE_START);
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imgLabel = new JLabel(new ImageIcon(img));
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pane.add(imgLabel, BorderLayout.CENTER);
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}
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//! [Threshold_Demo]
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private void update() {
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Imgproc.threshold(srcGray, dst, thresholdValue, MAX_BINARY_VALUE, thresholdType);
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Image img = HighGui.toBufferedImage(dst);
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imgLabel.setIcon(new ImageIcon(img));
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frame.repaint();
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}
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//! [Threshold_Demo]
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public static void main(String[] args) {
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// Load the native OpenCV library
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System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
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// Schedule a job for the event dispatch thread:
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// creating and showing this application's GUI.
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javax.swing.SwingUtilities.invokeLater(new Runnable() {
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@Override
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public void run() {
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new Threshold(args);
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}
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});
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}
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}
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