init - 初始化项目

samples/java/tutorial_code/ImgProc/erosion_dilatation/MorphologyDemo1.java

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+import java.awt.BorderLayout;
+import java.awt.Container;
+import java.awt.Image;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+import javax.swing.BoxLayout;
+import javax.swing.ImageIcon;
+import javax.swing.JComboBox;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JSlider;
+import javax.swing.event.ChangeEvent;
+import javax.swing.event.ChangeListener;
+
+import org.opencv.core.Core;
+import org.opencv.core.Mat;
+import org.opencv.core.Point;
+import org.opencv.core.Size;
+import org.opencv.highgui.HighGui;
+import org.opencv.imgcodecs.Imgcodecs;
+import org.opencv.imgproc.Imgproc;
+
+public class MorphologyDemo1 {
+    private static final String[] ELEMENT_TYPE = { "Rectangle", "Cross", "Ellipse" };
+    private static final String[] MORPH_OP = { "Erosion", "Dilatation" };
+    private static final int MAX_KERNEL_SIZE = 21;
+    private Mat matImgSrc;
+    private Mat matImgDst = new Mat();
+    private int elementType = Imgproc.CV_SHAPE_RECT;
+    private int kernelSize = 0;
+    private boolean doErosion = true;
+    private JFrame frame;
+    private JLabel imgLabel;
+
+    //! [constructor]
+    public MorphologyDemo1(String[] args) {
+        String imagePath = args.length > 0 ? args[0] : "../data/LinuxLogo.jpg";
+        matImgSrc = Imgcodecs.imread(imagePath);
+        if (matImgSrc.empty()) {
+            System.out.println("Empty image: " + imagePath);
+            System.exit(0);
+        }
+
+        // Create and set up the window.
+        frame = new JFrame("Erosion and dilatation demo");
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        // Set up the content pane.
+        Image img = HighGui.toBufferedImage(matImgSrc);
+        addComponentsToPane(frame.getContentPane(), img);
+        // Use the content pane's default BorderLayout. No need for
+        // setLayout(new BorderLayout());
+        // Display the window.
+        frame.pack();
+        frame.setVisible(true);
+    }
+    //! [constructor]
+
+    //! [components]
+    private void addComponentsToPane(Container pane, Image img) {
+        if (!(pane.getLayout() instanceof BorderLayout)) {
+            pane.add(new JLabel("Container doesn't use BorderLayout!"));
+            return;
+        }
+
+        JPanel sliderPanel = new JPanel();
+        sliderPanel.setLayout(new BoxLayout(sliderPanel, BoxLayout.PAGE_AXIS));
+
+        JComboBox<String> elementTypeBox = new JComboBox<>(ELEMENT_TYPE);
+        elementTypeBox.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                @SuppressWarnings("unchecked")
+                JComboBox<String> cb = (JComboBox<String>)e.getSource();
+                if (cb.getSelectedIndex() == 0) {
+                    elementType = Imgproc.CV_SHAPE_RECT;
+                } else if (cb.getSelectedIndex() == 1) {
+                    elementType = Imgproc.CV_SHAPE_CROSS;
+                } else if (cb.getSelectedIndex() == 2) {
+                    elementType = Imgproc.CV_SHAPE_ELLIPSE;
+                }
+                update();
+            }
+        });
+        sliderPanel.add(elementTypeBox);
+
+        sliderPanel.add(new JLabel("Kernel size: 2n + 1"));
+        JSlider slider = new JSlider(0, MAX_KERNEL_SIZE, 0);
+        slider.setMajorTickSpacing(5);
+        slider.setMinorTickSpacing(5);
+        slider.setPaintTicks(true);
+        slider.setPaintLabels(true);
+        slider.addChangeListener(new ChangeListener() {
+            @Override
+            public void stateChanged(ChangeEvent e) {
+                JSlider source = (JSlider) e.getSource();
+                kernelSize = source.getValue();
+                update();
+            }
+        });
+        sliderPanel.add(slider);
+
+        JComboBox<String> morphOpBox = new JComboBox<>(MORPH_OP);
+        morphOpBox.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                @SuppressWarnings("unchecked")
+                JComboBox<String> cb = (JComboBox<String>)e.getSource();
+                doErosion = cb.getSelectedIndex() == 0;
+                update();
+            }
+        });
+        sliderPanel.add(morphOpBox);
+
+        pane.add(sliderPanel, BorderLayout.PAGE_START);
+        imgLabel = new JLabel(new ImageIcon(img));
+        pane.add(imgLabel, BorderLayout.CENTER);
+    }
+    //! [components]
+
+    //! [update]
+    private void update() {
+        //! [kernel]
+        Mat element = Imgproc.getStructuringElement(elementType, new Size(2 * kernelSize + 1, 2 * kernelSize + 1),
+                new Point(kernelSize, kernelSize));
+        //! [kernel]
+
+        if (doErosion) {
+            //! [erosion]
+            Imgproc.erode(matImgSrc, matImgDst, element);
+            //! [erosion]
+        } else {
+            //! [dilation]
+            Imgproc.dilate(matImgSrc, matImgDst, element);
+            //! [dilation]
+        }
+        Image img = HighGui.toBufferedImage(matImgDst);
+        imgLabel.setIcon(new ImageIcon(img));
+        frame.repaint();
+    }
+    //! [update]
+
+    //! [main]
+    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 MorphologyDemo1(args);
+            }
+        });
+    }
+    //! [main]
+}