Add Java and Python code for the following imgproc tutorials: Canny, Remap, threshold and threshold inRange. Use HSV colorspace instead of RGB for inRange threshold tutorial.
This commit is contained in:
catree
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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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@@ -0,0 +1,259 @@
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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 java.awt.event.WindowAdapter;
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import java.awt.event.WindowEvent;
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import java.util.List;
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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.SwingWorker;
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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.core.Scalar;
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import org.opencv.highgui.HighGui;
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import org.opencv.imgproc.Imgproc;
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import org.opencv.videoio.VideoCapture;
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public class ThresholdInRange {
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private static int MAX_VALUE = 255;
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private static int MAX_VALUE_H = 360/2;
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private static final String WINDOW_NAME = "Thresholding Operations using inRange demo";
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private static final String LOW_H_NAME = "Low H";
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private static final String LOW_S_NAME = "Low S";
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private static final String LOW_V_NAME = "Low V";
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private static final String HIGH_H_NAME = "High H";
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private static final String HIGH_S_NAME = "High S";
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private static final String HIGH_V_NAME = "High V";
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private JSlider sliderLowH;
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private JSlider sliderHighH;
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private JSlider sliderLowS;
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private JSlider sliderHighS;
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private JSlider sliderLowV;
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private JSlider sliderHighV;
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private VideoCapture cap;
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private Mat matFrame = new Mat();
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private JFrame frame;
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private JLabel imgCaptureLabel;
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private JLabel imgDetectionLabel;
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private CaptureTask captureTask;
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public ThresholdInRange(String[] args) {
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int cameraDevice = 0;
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if (args.length > 0) {
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cameraDevice = Integer.parseInt(args[0]);
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}
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//! [cap]
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cap = new VideoCapture(cameraDevice);
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//! [cap]
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if (!cap.isOpened()) {
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System.err.println("Cannot open camera: " + cameraDevice);
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System.exit(0);
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}
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if (!cap.read(matFrame)) {
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System.err.println("Cannot read camera stream.");
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System.exit(0);
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}
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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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frame.addWindowListener(new WindowAdapter() {
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@Override
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public void windowClosing(WindowEvent windowEvent) {
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captureTask.cancel(true);
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}
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});
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// Set up the content pane.
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Image img = HighGui.toBufferedImage(matFrame);
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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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captureTask = new CaptureTask();
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captureTask.execute();
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}
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//! [while]
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private class CaptureTask extends SwingWorker<Void, Mat> {
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@Override
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protected Void doInBackground() {
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Mat matFrame = new Mat();
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while (!isCancelled()) {
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if (!cap.read(matFrame)) {
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break;
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}
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publish(matFrame.clone());
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}
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return null;
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}
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@Override
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protected void process(List<Mat> frames) {
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Mat frame = frames.get(frames.size() - 1);
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Mat frameHSV = new Mat();
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Imgproc.cvtColor(frame, frameHSV, Imgproc.COLOR_BGR2HSV);
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Mat thresh = new Mat();
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Core.inRange(frameHSV, new Scalar(sliderLowH.getValue(), sliderLowS.getValue(), sliderLowV.getValue()),
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new Scalar(sliderHighH.getValue(), sliderHighS.getValue(), sliderHighV.getValue()), thresh);
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update(frame, thresh);
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}
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}
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//! [while]
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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(LOW_H_NAME));
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sliderLowH = new JSlider(0, MAX_VALUE_H, 0);
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sliderLowH.setMajorTickSpacing(50);
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sliderLowH.setMinorTickSpacing(10);
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sliderLowH.setPaintTicks(true);
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sliderLowH.setPaintLabels(true);
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sliderPanel.add(sliderLowH);
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sliderPanel.add(new JLabel(HIGH_H_NAME));
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sliderHighH = new JSlider(0, MAX_VALUE_H, MAX_VALUE_H);
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sliderHighH.setMajorTickSpacing(50);
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sliderHighH.setMinorTickSpacing(10);
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sliderHighH.setPaintTicks(true);
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sliderHighH.setPaintLabels(true);
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sliderPanel.add(sliderHighH);
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sliderPanel.add(new JLabel(LOW_S_NAME));
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sliderLowS = new JSlider(0, MAX_VALUE, 0);
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sliderLowS.setMajorTickSpacing(50);
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sliderLowS.setMinorTickSpacing(10);
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sliderLowS.setPaintTicks(true);
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sliderLowS.setPaintLabels(true);
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sliderPanel.add(sliderLowS);
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sliderPanel.add(new JLabel(HIGH_S_NAME));
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sliderHighS = new JSlider(0, MAX_VALUE, MAX_VALUE);
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sliderHighS.setMajorTickSpacing(50);
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sliderHighS.setMinorTickSpacing(10);
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sliderHighS.setPaintTicks(true);
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sliderHighS.setPaintLabels(true);
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sliderPanel.add(sliderHighS);
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sliderPanel.add(new JLabel(LOW_V_NAME));
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sliderLowV = new JSlider(0, MAX_VALUE, 0);
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sliderLowV.setMajorTickSpacing(50);
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sliderLowV.setMinorTickSpacing(10);
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sliderLowV.setPaintTicks(true);
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sliderLowV.setPaintLabels(true);
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sliderPanel.add(sliderLowV);
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sliderPanel.add(new JLabel(HIGH_V_NAME));
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sliderHighV = new JSlider(0, MAX_VALUE, MAX_VALUE);
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sliderHighV.setMajorTickSpacing(50);
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sliderHighV.setMinorTickSpacing(10);
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sliderHighV.setPaintTicks(true);
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sliderHighV.setPaintLabels(true);
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sliderPanel.add(sliderHighV);
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//! [trackbar]
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//! [low]
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sliderLowH.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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int valH = Math.min(sliderHighH.getValue()-1, source.getValue());
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sliderLowH.setValue(valH);
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}
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});
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//! [low]
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//! [high]
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sliderHighH.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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int valH = Math.max(source.getValue(), sliderLowH.getValue()+1);
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sliderHighH.setValue(valH);
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}
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});
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//! [high]
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sliderLowS.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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int valS = Math.min(sliderHighS.getValue()-1, source.getValue());
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sliderLowS.setValue(valS);
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}
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});
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sliderHighS.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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int valS = Math.max(source.getValue(), sliderLowS.getValue()+1);
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sliderHighS.setValue(valS);
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}
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});
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sliderLowV.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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int valV = Math.min(sliderHighV.getValue()-1, source.getValue());
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sliderLowV.setValue(valV);
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}
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});
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sliderHighV.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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int valV = Math.max(source.getValue(), sliderLowV.getValue()+1);
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sliderHighV.setValue(valV);
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}
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});
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pane.add(sliderPanel, BorderLayout.PAGE_START);
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JPanel framePanel = new JPanel();
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imgCaptureLabel = new JLabel(new ImageIcon(img));
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framePanel.add(imgCaptureLabel);
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imgDetectionLabel = new JLabel(new ImageIcon(img));
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framePanel.add(imgDetectionLabel);
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pane.add(framePanel, BorderLayout.CENTER);
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}
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private void update(Mat imgCapture, Mat imgThresh) {
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//! [show]
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imgCaptureLabel.setIcon(new ImageIcon(HighGui.toBufferedImage(imgCapture)));
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imgDetectionLabel.setIcon(new ImageIcon(HighGui.toBufferedImage(imgThresh)));
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frame.repaint();
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//! [show]
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}
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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 ThresholdInRange(args);
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}
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});
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}
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}
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@@ -0,0 +1,110 @@
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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.CvType;
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import org.opencv.core.Mat;
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import org.opencv.core.Scalar;
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import org.opencv.core.Size;
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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 CannyDetectorDemo {
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private static final int MAX_LOW_THRESHOLD = 100;
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private static final int RATIO = 3;
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private static final int KERNEL_SIZE = 3;
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private static final Size BLUR_SIZE = new Size(3,3);
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private int lowThresh = 0;
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private Mat src;
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private Mat srcBlur = new Mat();
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private Mat detectedEdges = 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 CannyDetectorDemo(String[] args) {
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String imagePath = args.length > 0 ? args[0] : "../data/fruits.jpg";
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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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// Create and set up the window.
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frame = new JFrame("Edge Map (Canny detector demo)");
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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(src);
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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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}
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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();
|
||||
sliderPanel.setLayout(new BoxLayout(sliderPanel, BoxLayout.PAGE_AXIS));
|
||||
|
||||
sliderPanel.add(new JLabel("Min Threshold:"));
|
||||
JSlider slider = new JSlider(0, MAX_LOW_THRESHOLD, 0);
|
||||
slider.setMajorTickSpacing(10);
|
||||
slider.setMinorTickSpacing(5);
|
||||
slider.setPaintTicks(true);
|
||||
slider.setPaintLabels(true);
|
||||
slider.addChangeListener(new ChangeListener() {
|
||||
@Override
|
||||
public void stateChanged(ChangeEvent e) {
|
||||
JSlider source = (JSlider) e.getSource();
|
||||
lowThresh = source.getValue();
|
||||
update();
|
||||
}
|
||||
});
|
||||
sliderPanel.add(slider);
|
||||
|
||||
pane.add(sliderPanel, BorderLayout.PAGE_START);
|
||||
imgLabel = new JLabel(new ImageIcon(img));
|
||||
pane.add(imgLabel, BorderLayout.CENTER);
|
||||
}
|
||||
|
||||
private void update() {
|
||||
Imgproc.blur(src, srcBlur, BLUR_SIZE);
|
||||
Imgproc.Canny(srcBlur, detectedEdges, lowThresh, lowThresh * RATIO, KERNEL_SIZE, false);
|
||||
dst = new Mat(src.size(), CvType.CV_8UC3, Scalar.all(0));
|
||||
src.copyTo(dst, detectedEdges);
|
||||
Image img = HighGui.toBufferedImage(dst);
|
||||
imgLabel.setIcon(new ImageIcon(img));
|
||||
frame.repaint();
|
||||
}
|
||||
|
||||
public static void main(String[] args) {
|
||||
// Load the native OpenCV library
|
||||
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
|
||||
|
||||
// Schedule a job for the event dispatch thread:
|
||||
// creating and showing this application's GUI.
|
||||
javax.swing.SwingUtilities.invokeLater(new Runnable() {
|
||||
@Override
|
||||
public void run() {
|
||||
new CannyDetectorDemo(args);
|
||||
}
|
||||
});
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,98 @@
|
||||
import org.opencv.core.Core;
|
||||
import org.opencv.core.CvType;
|
||||
import org.opencv.core.Mat;
|
||||
import org.opencv.highgui.HighGui;
|
||||
import org.opencv.imgcodecs.Imgcodecs;
|
||||
import org.opencv.imgproc.Imgproc;
|
||||
|
||||
class Remap {
|
||||
private Mat mapX = new Mat();
|
||||
private Mat mapY = new Mat();
|
||||
private Mat dst = new Mat();
|
||||
private int ind = 0;
|
||||
|
||||
//! [Update]
|
||||
private void updateMap() {
|
||||
float buffX[] = new float[(int) (mapX.total() * mapX.channels())];
|
||||
mapX.get(0, 0, buffX);
|
||||
|
||||
float buffY[] = new float[(int) (mapY.total() * mapY.channels())];
|
||||
mapY.get(0, 0, buffY);
|
||||
|
||||
for (int i = 0; i < mapX.rows(); i++) {
|
||||
for (int j = 0; j < mapX.cols(); j++) {
|
||||
switch (ind) {
|
||||
case 0:
|
||||
if( j > mapX.cols()*0.25 && j < mapX.cols()*0.75 && i > mapX.rows()*0.25 && i < mapX.rows()*0.75 ) {
|
||||
buffX[i*mapX.cols() + j] = 2*( j - mapX.cols()*0.25f ) + 0.5f;
|
||||
buffY[i*mapY.cols() + j] = 2*( i - mapX.rows()*0.25f ) + 0.5f;
|
||||
} else {
|
||||
buffX[i*mapX.cols() + j] = 0;
|
||||
buffY[i*mapY.cols() + j] = 0;
|
||||
}
|
||||
break;
|
||||
case 1:
|
||||
buffX[i*mapX.cols() + j] = j;
|
||||
buffY[i*mapY.cols() + j] = mapY.rows() - i;
|
||||
break;
|
||||
case 2:
|
||||
buffX[i*mapX.cols() + j] = mapY.cols() - j;
|
||||
buffY[i*mapY.cols() + j] = i;
|
||||
break;
|
||||
case 3:
|
||||
buffX[i*mapX.cols() + j] = mapY.cols() - j;
|
||||
buffY[i*mapY.cols() + j] = mapY.rows() - i;
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
mapX.put(0, 0, buffX);
|
||||
mapY.put(0, 0, buffY);
|
||||
ind = (ind+1) % 4;
|
||||
}
|
||||
//! [Update]
|
||||
|
||||
public void run(String[] args) {
|
||||
String filename = args.length > 0 ? args[0] : "../data/chicky_512.png";
|
||||
//! [Load]
|
||||
Mat src = Imgcodecs.imread(filename, Imgcodecs.IMREAD_COLOR);
|
||||
if (src.empty()) {
|
||||
System.err.println("Cannot read image: " + filename);
|
||||
System.exit(0);
|
||||
}
|
||||
//! [Load]
|
||||
|
||||
//! [Create]
|
||||
mapX = new Mat(src.size(), CvType.CV_32F);
|
||||
mapY = new Mat(src.size(), CvType.CV_32F);
|
||||
//! [Create]
|
||||
|
||||
//! [Window]
|
||||
final String winname = "Remap demo";
|
||||
HighGui.namedWindow(winname, HighGui.WINDOW_AUTOSIZE);
|
||||
//! [Window]
|
||||
|
||||
//! [Loop]
|
||||
for (;;) {
|
||||
updateMap();
|
||||
Imgproc.remap(src, dst, mapX, mapY, Imgproc.INTER_LINEAR);
|
||||
HighGui.imshow(winname, dst);
|
||||
if (HighGui.waitKey(1000) == 27) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
//! [Loop]
|
||||
System.exit(0);
|
||||
}
|
||||
}
|
||||
|
||||
public class RemapDemo {
|
||||
public static void main(String[] args) {
|
||||
// Load the native OpenCV library
|
||||
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
|
||||
|
||||
new Remap().run(args);
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user