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https://github.com/zebrajr/opencv.git
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Add Java and Python code for the following imgproc tutorials: Finding contours in your image, Convex Hull, Creating Bounding boxes and circles for contours, Creating Bounding rotated boxes and ellipses for contours, Image Moments, Point Polygon Test.
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 java.util.ArrayList;
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import java.util.List;
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import java.util.Random;
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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.MatOfPoint;
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import org.opencv.core.MatOfPoint2f;
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import org.opencv.core.Point;
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import org.opencv.core.Rect;
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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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class GeneralContours1 {
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private Mat srcGray = new Mat();
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private JFrame frame;
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private JLabel imgSrcLabel;
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private JLabel imgContoursLabel;
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private static final int MAX_THRESHOLD = 255;
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private int threshold = 100;
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private Random rng = new Random(12345);
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public GeneralContours1(String[] args) {
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//! [setup]
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/// Load source image
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String filename = args.length > 0 ? args[0] : "../data/stuff.jpg";
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Mat src = Imgcodecs.imread(filename);
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if (src.empty()) {
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System.err.println("Cannot read image: " + filename);
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System.exit(0);
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}
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/// Convert image to gray and blur it
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Imgproc.cvtColor(src, srcGray, Imgproc.COLOR_BGR2GRAY);
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Imgproc.blur(srcGray, srcGray, new Size(3, 3));
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//! [setup]
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//! [createWindow]
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// Create and set up the window.
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frame = new JFrame("Creating Bounding boxes and circles for contours 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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//! [createWindow]
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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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update();
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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("Canny threshold: "));
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JSlider slider = new JSlider(0, MAX_THRESHOLD, threshold);
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slider.setMajorTickSpacing(20);
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slider.setMinorTickSpacing(10);
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slider.setPaintTicks(true);
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slider.setPaintLabels(true);
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slider.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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threshold = source.getValue();
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update();
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}
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});
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//! [trackbar]
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sliderPanel.add(slider);
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pane.add(sliderPanel, BorderLayout.PAGE_START);
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JPanel imgPanel = new JPanel();
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imgSrcLabel = new JLabel(new ImageIcon(img));
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imgPanel.add(imgSrcLabel);
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Mat blackImg = Mat.zeros(srcGray.size(), CvType.CV_8U);
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imgContoursLabel = new JLabel(new ImageIcon(HighGui.toBufferedImage(blackImg)));
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imgPanel.add(imgContoursLabel);
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pane.add(imgPanel, BorderLayout.CENTER);
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}
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private void update() {
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//! [Canny]
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/// Detect edges using Canny
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Mat cannyOutput = new Mat();
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Imgproc.Canny(srcGray, cannyOutput, threshold, threshold * 2);
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//! [Canny]
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//! [findContours]
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/// Find contours
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List<MatOfPoint> contours = new ArrayList<>();
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Mat hierarchy = new Mat();
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Imgproc.findContours(cannyOutput, contours, hierarchy, Imgproc.RETR_TREE, Imgproc.CHAIN_APPROX_SIMPLE);
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//! [findContours]
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//! [allthework]
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/// Approximate contours to polygons + get bounding rects and circles
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MatOfPoint2f[] contoursPoly = new MatOfPoint2f[contours.size()];
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Rect[] boundRect = new Rect[contours.size()];
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Point[] centers = new Point[contours.size()];
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float[][] radius = new float[contours.size()][1];
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for (int i = 0; i < contours.size(); i++) {
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contoursPoly[i] = new MatOfPoint2f();
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Imgproc.approxPolyDP(new MatOfPoint2f(contours.get(i).toArray()), contoursPoly[i], 3, true);
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boundRect[i] = Imgproc.boundingRect(new MatOfPoint(contoursPoly[i].toArray()));
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centers[i] = new Point();
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Imgproc.minEnclosingCircle(contoursPoly[i], centers[i], radius[i]);
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}
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//! [allthework]
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//! [zeroMat]
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Mat drawing = Mat.zeros(cannyOutput.size(), CvType.CV_8UC3);
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//! [zeroMat]
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//! [forContour]
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/// Draw polygonal contour + bonding rects + circles
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List<MatOfPoint> contoursPolyList = new ArrayList<>(contoursPoly.length);
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for (MatOfPoint2f poly : contoursPoly) {
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contoursPolyList.add(new MatOfPoint(poly.toArray()));
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}
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for (int i = 0; i < contours.size(); i++) {
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Scalar color = new Scalar(rng.nextInt(256), rng.nextInt(256), rng.nextInt(256));
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Imgproc.drawContours(drawing, contoursPolyList, i, color);
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Imgproc.rectangle(drawing, boundRect[i].tl(), boundRect[i].br(), color, 2);
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Imgproc.circle(drawing, centers[i], (int) radius[i][0], color, 2);
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}
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//! [forContour]
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//! [showDrawings]
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/// Show in a window
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imgContoursLabel.setIcon(new ImageIcon(HighGui.toBufferedImage(drawing)));
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frame.repaint();
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//! [showDrawings]
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}
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}
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public class GeneralContoursDemo1 {
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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 GeneralContours1(args);
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}
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});
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}
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}
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@@ -0,0 +1,176 @@
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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.util.ArrayList;
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import java.util.List;
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import java.util.Random;
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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.MatOfPoint;
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import org.opencv.core.MatOfPoint2f;
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import org.opencv.core.Point;
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import org.opencv.core.RotatedRect;
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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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class GeneralContours2 {
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private Mat srcGray = new Mat();
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private JFrame frame;
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private JLabel imgSrcLabel;
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private JLabel imgContoursLabel;
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private static final int MAX_THRESHOLD = 255;
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private int threshold = 100;
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private Random rng = new Random(12345);
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public GeneralContours2(String[] args) {
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//! [setup]
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/// Load source image
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String filename = args.length > 0 ? args[0] : "../data/stuff.jpg";
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Mat src = Imgcodecs.imread(filename);
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if (src.empty()) {
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System.err.println("Cannot read image: " + filename);
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System.exit(0);
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}
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/// Convert image to gray and blur it
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Imgproc.cvtColor(src, srcGray, Imgproc.COLOR_BGR2GRAY);
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Imgproc.blur(srcGray, srcGray, new Size(3, 3));
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//! [setup]
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//! [createWindow]
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// Create and set up the window.
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frame = new JFrame("Creating Bounding rotated boxes and ellipses for contours 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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//! [createWindow]
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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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update();
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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("Canny threshold: "));
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JSlider slider = new JSlider(0, MAX_THRESHOLD, threshold);
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slider.setMajorTickSpacing(20);
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slider.setMinorTickSpacing(10);
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slider.setPaintTicks(true);
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slider.setPaintLabels(true);
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slider.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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threshold = source.getValue();
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update();
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}
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});
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//! [trackbar]
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sliderPanel.add(slider);
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pane.add(sliderPanel, BorderLayout.PAGE_START);
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JPanel imgPanel = new JPanel();
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imgSrcLabel = new JLabel(new ImageIcon(img));
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imgPanel.add(imgSrcLabel);
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Mat blackImg = Mat.zeros(srcGray.size(), CvType.CV_8U);
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imgContoursLabel = new JLabel(new ImageIcon(HighGui.toBufferedImage(blackImg)));
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imgPanel.add(imgContoursLabel);
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pane.add(imgPanel, BorderLayout.CENTER);
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}
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private void update() {
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//! [Canny]
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/// Detect edges using Canny
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Mat cannyOutput = new Mat();
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Imgproc.Canny(srcGray, cannyOutput, threshold, threshold * 2);
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//! [Canny]
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//! [findContours]
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/// Find contours
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List<MatOfPoint> contours = new ArrayList<>();
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Mat hierarchy = new Mat();
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Imgproc.findContours(cannyOutput, contours, hierarchy, Imgproc.RETR_TREE, Imgproc.CHAIN_APPROX_SIMPLE);
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//! [findContours]
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/// Find the rotated rectangles and ellipses for each contour
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RotatedRect[] minRect = new RotatedRect[contours.size()];
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RotatedRect[] minEllipse = new RotatedRect[contours.size()];
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for (int i = 0; i < contours.size(); i++) {
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minRect[i] = Imgproc.minAreaRect(new MatOfPoint2f(contours.get(i).toArray()));
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minEllipse[i] = new RotatedRect();
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if (contours.get(i).rows() > 5) {
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minEllipse[i] = Imgproc.fitEllipse(new MatOfPoint2f(contours.get(i).toArray()));
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}
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}
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//! [zeroMat]
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/// Draw contours + rotated rects + ellipses
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Mat drawing = Mat.zeros(cannyOutput.size(), CvType.CV_8UC3);
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//! [zeroMat]
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//! [forContour]
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for (int i = 0; i < contours.size(); i++) {
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Scalar color = new Scalar(rng.nextInt(256), rng.nextInt(256), rng.nextInt(256));
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// contour
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Imgproc.drawContours(drawing, contours, i, color);
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// ellipse
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Imgproc.ellipse(drawing, minEllipse[i], color, 2);
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// rotated rectangle
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Point[] rectPoints = new Point[4];
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minRect[i].points(rectPoints);
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for (int j = 0; j < 4; j++) {
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Imgproc.line(drawing, rectPoints[j], rectPoints[(j+1) % 4], color);
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}
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}
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//! [forContour]
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//! [showDrawings]
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/// Show in a window
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imgContoursLabel.setIcon(new ImageIcon(HighGui.toBufferedImage(drawing)));
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frame.repaint();
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//! [showDrawings]
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}
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}
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public class GeneralContoursDemo2 {
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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 GeneralContours2(args);
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}
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});
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}
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}
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@@ -0,0 +1,137 @@
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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.util.ArrayList;
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import java.util.List;
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import java.util.Random;
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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.MatOfPoint;
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import org.opencv.core.Point;
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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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class FindContours {
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private Mat srcGray = new Mat();
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private JFrame frame;
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private JLabel imgSrcLabel;
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private JLabel imgContoursLabel;
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private static final int MAX_THRESHOLD = 255;
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private int threshold = 100;
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private Random rng = new Random(12345);
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public FindContours(String[] args) {
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/// Load source image
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String filename = args.length > 0 ? args[0] : "../data/HappyFish.jpg";
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Mat src = Imgcodecs.imread(filename);
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if (src.empty()) {
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System.err.println("Cannot read image: " + filename);
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System.exit(0);
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}
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/// Convert image to gray and blur it
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Imgproc.cvtColor(src, srcGray, Imgproc.COLOR_BGR2GRAY);
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Imgproc.blur(srcGray, srcGray, new Size(3, 3));
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// Create and set up the window.
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frame = new JFrame("Finding contours in your image 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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update();
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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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sliderPanel.add(new JLabel("Canny threshold: "));
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JSlider slider = new JSlider(0, MAX_THRESHOLD, threshold);
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slider.setMajorTickSpacing(20);
|
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slider.setMinorTickSpacing(10);
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slider.setPaintTicks(true);
|
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slider.setPaintLabels(true);
|
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slider.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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threshold = source.getValue();
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update();
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}
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});
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sliderPanel.add(slider);
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pane.add(sliderPanel, BorderLayout.PAGE_START);
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JPanel imgPanel = new JPanel();
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imgSrcLabel = new JLabel(new ImageIcon(img));
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imgPanel.add(imgSrcLabel);
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Mat blackImg = Mat.zeros(srcGray.size(), CvType.CV_8U);
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imgContoursLabel = new JLabel(new ImageIcon(HighGui.toBufferedImage(blackImg)));
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imgPanel.add(imgContoursLabel);
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pane.add(imgPanel, BorderLayout.CENTER);
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}
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||||
|
||||
private void update() {
|
||||
/// Detect edges using Canny
|
||||
Mat cannyOutput = new Mat();
|
||||
Imgproc.Canny(srcGray, cannyOutput, threshold, threshold * 2);
|
||||
|
||||
/// Find contours
|
||||
List<MatOfPoint> contours = new ArrayList<>();
|
||||
Mat hierarchy = new Mat();
|
||||
Imgproc.findContours(cannyOutput, contours, hierarchy, Imgproc.RETR_TREE, Imgproc.CHAIN_APPROX_SIMPLE);
|
||||
|
||||
/// Draw contours
|
||||
Mat drawing = Mat.zeros(cannyOutput.size(), CvType.CV_8UC3);
|
||||
for (int i = 0; i < contours.size(); i++) {
|
||||
Scalar color = new Scalar(rng.nextInt(256), rng.nextInt(256), rng.nextInt(256));
|
||||
Imgproc.drawContours(drawing, contours, i, color, 2, Core.LINE_8, hierarchy, 0, new Point());
|
||||
}
|
||||
|
||||
imgContoursLabel.setIcon(new ImageIcon(HighGui.toBufferedImage(drawing)));
|
||||
frame.repaint();
|
||||
}
|
||||
}
|
||||
|
||||
public class FindContoursDemo {
|
||||
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 FindContours(args);
|
||||
}
|
||||
});
|
||||
}
|
||||
}
|
||||
154
samples/java/tutorial_code/ShapeDescriptors/hull/HullDemo.java
Normal file
154
samples/java/tutorial_code/ShapeDescriptors/hull/HullDemo.java
Normal file
@@ -0,0 +1,154 @@
|
||||
import java.awt.BorderLayout;
|
||||
import java.awt.Container;
|
||||
import java.awt.Image;
|
||||
import java.util.ArrayList;
|
||||
import java.util.List;
|
||||
import java.util.Random;
|
||||
|
||||
import javax.swing.BoxLayout;
|
||||
import javax.swing.ImageIcon;
|
||||
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.CvType;
|
||||
import org.opencv.core.Mat;
|
||||
import org.opencv.core.MatOfInt;
|
||||
import org.opencv.core.MatOfPoint;
|
||||
import org.opencv.core.Point;
|
||||
import org.opencv.core.Scalar;
|
||||
import org.opencv.core.Size;
|
||||
import org.opencv.highgui.HighGui;
|
||||
import org.opencv.imgcodecs.Imgcodecs;
|
||||
import org.opencv.imgproc.Imgproc;
|
||||
|
||||
class Hull {
|
||||
private Mat srcGray = new Mat();
|
||||
private JFrame frame;
|
||||
private JLabel imgSrcLabel;
|
||||
private JLabel imgContoursLabel;
|
||||
private static final int MAX_THRESHOLD = 255;
|
||||
private int threshold = 100;
|
||||
private Random rng = new Random(12345);
|
||||
|
||||
public Hull(String[] args) {
|
||||
/// Load source image
|
||||
String filename = args.length > 0 ? args[0] : "../data/stuff.jpg";
|
||||
Mat src = Imgcodecs.imread(filename);
|
||||
if (src.empty()) {
|
||||
System.err.println("Cannot read image: " + filename);
|
||||
System.exit(0);
|
||||
}
|
||||
|
||||
/// Convert image to gray and blur it
|
||||
Imgproc.cvtColor(src, srcGray, Imgproc.COLOR_BGR2GRAY);
|
||||
Imgproc.blur(srcGray, srcGray, new Size(3, 3));
|
||||
|
||||
// Create and set up the window.
|
||||
frame = new JFrame("Convex Hull demo");
|
||||
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
|
||||
// Set up the content pane.
|
||||
Image img = HighGui.toBufferedImage(src);
|
||||
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);
|
||||
update();
|
||||
}
|
||||
|
||||
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));
|
||||
|
||||
sliderPanel.add(new JLabel("Canny threshold: "));
|
||||
JSlider slider = new JSlider(0, MAX_THRESHOLD, threshold);
|
||||
slider.setMajorTickSpacing(20);
|
||||
slider.setMinorTickSpacing(10);
|
||||
slider.setPaintTicks(true);
|
||||
slider.setPaintLabels(true);
|
||||
slider.addChangeListener(new ChangeListener() {
|
||||
@Override
|
||||
public void stateChanged(ChangeEvent e) {
|
||||
JSlider source = (JSlider) e.getSource();
|
||||
threshold = source.getValue();
|
||||
update();
|
||||
}
|
||||
});
|
||||
sliderPanel.add(slider);
|
||||
pane.add(sliderPanel, BorderLayout.PAGE_START);
|
||||
|
||||
JPanel imgPanel = new JPanel();
|
||||
imgSrcLabel = new JLabel(new ImageIcon(img));
|
||||
imgPanel.add(imgSrcLabel);
|
||||
|
||||
Mat blackImg = Mat.zeros(srcGray.size(), CvType.CV_8U);
|
||||
imgContoursLabel = new JLabel(new ImageIcon(HighGui.toBufferedImage(blackImg)));
|
||||
imgPanel.add(imgContoursLabel);
|
||||
|
||||
pane.add(imgPanel, BorderLayout.CENTER);
|
||||
}
|
||||
|
||||
private void update() {
|
||||
/// Detect edges using Canny
|
||||
Mat cannyOutput = new Mat();
|
||||
Imgproc.Canny(srcGray, cannyOutput, threshold, threshold * 2);
|
||||
|
||||
/// Find contours
|
||||
List<MatOfPoint> contours = new ArrayList<>();
|
||||
Mat hierarchy = new Mat();
|
||||
Imgproc.findContours(cannyOutput, contours, hierarchy, Imgproc.RETR_TREE, Imgproc.CHAIN_APPROX_SIMPLE);
|
||||
|
||||
/// Find the convex hull object for each contour
|
||||
List<MatOfPoint> hullList = new ArrayList<>();
|
||||
for (MatOfPoint contour : contours) {
|
||||
MatOfInt hull = new MatOfInt();
|
||||
Imgproc.convexHull(contour, hull);
|
||||
|
||||
Point[] contourArray = contour.toArray();
|
||||
Point[] hullPoints = new Point[hull.rows()];
|
||||
List<Integer> hullContourIdxList = hull.toList();
|
||||
for (int i = 0; i < hullContourIdxList.size(); i++) {
|
||||
hullPoints[i] = contourArray[hullContourIdxList.get(i)];
|
||||
}
|
||||
hullList.add(new MatOfPoint(hullPoints));
|
||||
}
|
||||
|
||||
/// Draw contours + hull results
|
||||
Mat drawing = Mat.zeros(cannyOutput.size(), CvType.CV_8UC3);
|
||||
for (int i = 0; i < contours.size(); i++) {
|
||||
Scalar color = new Scalar(rng.nextInt(256), rng.nextInt(256), rng.nextInt(256));
|
||||
Imgproc.drawContours(drawing, contours, i, color);
|
||||
Imgproc.drawContours(drawing, hullList, i, color );
|
||||
}
|
||||
|
||||
imgContoursLabel.setIcon(new ImageIcon(HighGui.toBufferedImage(drawing)));
|
||||
frame.repaint();
|
||||
}
|
||||
}
|
||||
|
||||
public class HullDemo {
|
||||
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 Hull(args);
|
||||
}
|
||||
});
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,178 @@
|
||||
import java.awt.BorderLayout;
|
||||
import java.awt.Container;
|
||||
import java.awt.Image;
|
||||
import java.util.ArrayList;
|
||||
import java.util.List;
|
||||
import java.util.Random;
|
||||
|
||||
import javax.swing.BoxLayout;
|
||||
import javax.swing.ImageIcon;
|
||||
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.CvType;
|
||||
import org.opencv.core.Mat;
|
||||
import org.opencv.core.MatOfPoint;
|
||||
import org.opencv.core.MatOfPoint2f;
|
||||
import org.opencv.core.Point;
|
||||
import org.opencv.core.Scalar;
|
||||
import org.opencv.core.Size;
|
||||
import org.opencv.highgui.HighGui;
|
||||
import org.opencv.imgcodecs.Imgcodecs;
|
||||
import org.opencv.imgproc.Imgproc;
|
||||
import org.opencv.imgproc.Moments;
|
||||
|
||||
class MomentsClass {
|
||||
private Mat srcGray = new Mat();
|
||||
private JFrame frame;
|
||||
private JLabel imgSrcLabel;
|
||||
private JLabel imgContoursLabel;
|
||||
private static final int MAX_THRESHOLD = 255;
|
||||
private int threshold = 100;
|
||||
private Random rng = new Random(12345);
|
||||
|
||||
public MomentsClass(String[] args) {
|
||||
//! [setup]
|
||||
/// Load source image
|
||||
String filename = args.length > 0 ? args[0] : "../data/stuff.jpg";
|
||||
Mat src = Imgcodecs.imread(filename);
|
||||
if (src.empty()) {
|
||||
System.err.println("Cannot read image: " + filename);
|
||||
System.exit(0);
|
||||
}
|
||||
|
||||
/// Convert image to gray and blur it
|
||||
Imgproc.cvtColor(src, srcGray, Imgproc.COLOR_BGR2GRAY);
|
||||
Imgproc.blur(srcGray, srcGray, new Size(3, 3));
|
||||
//! [setup]
|
||||
|
||||
//! [createWindow]
|
||||
// Create and set up the window.
|
||||
frame = new JFrame("Image Moments demo");
|
||||
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
|
||||
// Set up the content pane.
|
||||
Image img = HighGui.toBufferedImage(src);
|
||||
addComponentsToPane(frame.getContentPane(), img);
|
||||
//! [createWindow]
|
||||
// Use the content pane's default BorderLayout. No need for
|
||||
// setLayout(new BorderLayout());
|
||||
// Display the window.
|
||||
frame.pack();
|
||||
frame.setVisible(true);
|
||||
update();
|
||||
}
|
||||
|
||||
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));
|
||||
|
||||
//! [trackbar]
|
||||
sliderPanel.add(new JLabel("Canny threshold: "));
|
||||
JSlider slider = new JSlider(0, MAX_THRESHOLD, threshold);
|
||||
slider.setMajorTickSpacing(20);
|
||||
slider.setMinorTickSpacing(10);
|
||||
slider.setPaintTicks(true);
|
||||
slider.setPaintLabels(true);
|
||||
slider.addChangeListener(new ChangeListener() {
|
||||
@Override
|
||||
public void stateChanged(ChangeEvent e) {
|
||||
JSlider source = (JSlider) e.getSource();
|
||||
threshold = source.getValue();
|
||||
update();
|
||||
}
|
||||
});
|
||||
//! [trackbar]
|
||||
sliderPanel.add(slider);
|
||||
pane.add(sliderPanel, BorderLayout.PAGE_START);
|
||||
|
||||
JPanel imgPanel = new JPanel();
|
||||
imgSrcLabel = new JLabel(new ImageIcon(img));
|
||||
imgPanel.add(imgSrcLabel);
|
||||
|
||||
Mat blackImg = Mat.zeros(srcGray.size(), CvType.CV_8U);
|
||||
imgContoursLabel = new JLabel(new ImageIcon(HighGui.toBufferedImage(blackImg)));
|
||||
imgPanel.add(imgContoursLabel);
|
||||
|
||||
pane.add(imgPanel, BorderLayout.CENTER);
|
||||
}
|
||||
|
||||
private void update() {
|
||||
//! [Canny]
|
||||
/// Detect edges using Canny
|
||||
Mat cannyOutput = new Mat();
|
||||
Imgproc.Canny(srcGray, cannyOutput, threshold, threshold * 2);
|
||||
//! [Canny]
|
||||
|
||||
//! [findContours]
|
||||
/// Find contours
|
||||
List<MatOfPoint> contours = new ArrayList<>();
|
||||
Mat hierarchy = new Mat();
|
||||
Imgproc.findContours(cannyOutput, contours, hierarchy, Imgproc.RETR_TREE, Imgproc.CHAIN_APPROX_SIMPLE);
|
||||
//! [findContours]
|
||||
|
||||
/// Get the moments
|
||||
List<Moments> mu = new ArrayList<>(contours.size());
|
||||
for (int i = 0; i < contours.size(); i++) {
|
||||
mu.add(Imgproc.moments(contours.get(i)));
|
||||
}
|
||||
|
||||
/// Get the mass centers
|
||||
List<Point> mc = new ArrayList<>(contours.size());
|
||||
for (int i = 0; i < contours.size(); i++) {
|
||||
//add 1e-5 to avoid division by zero
|
||||
mc.add(new Point(mu.get(i).m10 / (mu.get(i).m00 + 1e-5), mu.get(i).m01 / (mu.get(i).m00 + 1e-5)));
|
||||
}
|
||||
|
||||
//! [zeroMat]
|
||||
/// Draw contours
|
||||
Mat drawing = Mat.zeros(cannyOutput.size(), CvType.CV_8UC3);
|
||||
//! [zeroMat]
|
||||
//! [forContour]
|
||||
for (int i = 0; i < contours.size(); i++) {
|
||||
Scalar color = new Scalar(rng.nextInt(256), rng.nextInt(256), rng.nextInt(256));
|
||||
Imgproc.drawContours(drawing, contours, i, color, 2);
|
||||
Imgproc.circle(drawing, mc.get(i), 4, color, -1);
|
||||
}
|
||||
//! [forContour]
|
||||
|
||||
//! [showDrawings]
|
||||
/// Show in a window
|
||||
imgContoursLabel.setIcon(new ImageIcon(HighGui.toBufferedImage(drawing)));
|
||||
frame.repaint();
|
||||
//! [showDrawings]
|
||||
|
||||
/// Calculate the area with the moments 00 and compare with the result of the OpenCV function
|
||||
System.out.println("\t Info: Area and Contour Length \n");
|
||||
for (int i = 0; i < contours.size(); i++) {
|
||||
System.out.format(" * Contour[%d] - Area (M_00) = %.2f - Area OpenCV: %.2f - Length: %.2f\n", i,
|
||||
mu.get(i).m00, Imgproc.contourArea(contours.get(i)),
|
||||
Imgproc.arcLength(new MatOfPoint2f(contours.get(i).toArray()), true));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
public class MomentsDemo {
|
||||
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 MomentsClass(args);
|
||||
}
|
||||
});
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,93 @@
|
||||
import java.util.ArrayList;
|
||||
import java.util.List;
|
||||
|
||||
import org.opencv.core.Core;
|
||||
import org.opencv.core.Core.MinMaxLocResult;
|
||||
import org.opencv.core.CvType;
|
||||
import org.opencv.core.Mat;
|
||||
import org.opencv.core.MatOfPoint;
|
||||
import org.opencv.core.MatOfPoint2f;
|
||||
import org.opencv.core.Point;
|
||||
import org.opencv.core.Scalar;
|
||||
import org.opencv.core.Size;
|
||||
import org.opencv.highgui.HighGui;
|
||||
import org.opencv.imgproc.Imgproc;
|
||||
|
||||
class PointPolygonTest {
|
||||
public void run() {
|
||||
/// Create an image
|
||||
int r = 100;
|
||||
Mat src = Mat.zeros(new Size(4 * r, 4 * r), CvType.CV_8U);
|
||||
|
||||
/// Create a sequence of points to make a contour
|
||||
List<Point> vert = new ArrayList<>(6);
|
||||
vert.add(new Point(3 * r / 2, 1.34 * r));
|
||||
vert.add(new Point(1 * r, 2 * r));
|
||||
vert.add(new Point(3 * r / 2, 2.866 * r));
|
||||
vert.add(new Point(5 * r / 2, 2.866 * r));
|
||||
vert.add(new Point(3 * r, 2 * r));
|
||||
vert.add(new Point(5 * r / 2, 1.34 * r));
|
||||
|
||||
/// Draw it in src
|
||||
for (int i = 0; i < 6; i++) {
|
||||
Imgproc.line(src, vert.get(i), vert.get((i + 1) % 6), new Scalar(255), 3);
|
||||
}
|
||||
|
||||
/// Get the contours
|
||||
List<MatOfPoint> contours = new ArrayList<>();
|
||||
Mat hierarchy = new Mat();
|
||||
Imgproc.findContours(src, contours, hierarchy, Imgproc.RETR_TREE, Imgproc.CHAIN_APPROX_SIMPLE);
|
||||
|
||||
/// Calculate the distances to the contour
|
||||
Mat rawDist = new Mat(src.size(), CvType.CV_32F);
|
||||
float[] rawDistData = new float[(int) (rawDist.total() * rawDist.channels())];
|
||||
for (int i = 0; i < src.rows(); i++) {
|
||||
for (int j = 0; j < src.cols(); j++) {
|
||||
rawDistData[i * src.cols() + j] = (float) Imgproc
|
||||
.pointPolygonTest(new MatOfPoint2f(contours.get(0).toArray()), new Point(j, i), true);
|
||||
}
|
||||
}
|
||||
rawDist.put(0, 0, rawDistData);
|
||||
|
||||
MinMaxLocResult res = Core.minMaxLoc(rawDist);
|
||||
double minVal = Math.abs(res.minVal);
|
||||
double maxVal = Math.abs(res.maxVal);
|
||||
|
||||
/// Depicting the distances graphically
|
||||
Mat drawing = Mat.zeros(src.size(), CvType.CV_8UC3);
|
||||
byte[] drawingData = new byte[(int) (drawing.total() * drawing.channels())];
|
||||
for (int i = 0; i < src.rows(); i++) {
|
||||
for (int j = 0; j < src.cols(); j++) {
|
||||
if (rawDistData[i * src.cols() + j] < 0) {
|
||||
drawingData[(i * src.cols() + j) * 3] =
|
||||
(byte) (255 - Math.abs(rawDistData[i * src.cols() + j]) * 255 / minVal);
|
||||
} else if (rawDistData[i * src.cols() + j] > 0) {
|
||||
drawingData[(i * src.cols() + j) * 3 + 2] =
|
||||
(byte) (255 - rawDistData[i * src.cols() + j] * 255 / maxVal);
|
||||
} else {
|
||||
drawingData[(i * src.cols() + j) * 3] = (byte) 255;
|
||||
drawingData[(i * src.cols() + j) * 3 + 1] = (byte) 255;
|
||||
drawingData[(i * src.cols() + j) * 3 + 2] = (byte) 255;
|
||||
}
|
||||
}
|
||||
}
|
||||
drawing.put(0, 0, drawingData);
|
||||
|
||||
/// Show your results
|
||||
HighGui.imshow("Source", src);
|
||||
HighGui.imshow("Distance", drawing);
|
||||
|
||||
HighGui.waitKey();
|
||||
System.exit(0);
|
||||
}
|
||||
}
|
||||
|
||||
public class PointPolygonTestDemo {
|
||||
public static void main(String[] args) {
|
||||
// Load the native OpenCV library
|
||||
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
|
||||
|
||||
new PointPolygonTest().run();
|
||||
}
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user