+import java.awt.BorderLayout;
+import java.awt.Container;
+import java.awt.Image;
+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.Core.MinMaxLocResult;
+import org.opencv.core.CvType;
+import org.opencv.core.Mat;
+import org.opencv.core.Point;
+import org.opencv.core.Scalar;
+import org.opencv.highgui.HighGui;
+import org.opencv.imgcodecs.Imgcodecs;
+import org.opencv.imgproc.Imgproc;
+
+class CornerDetector {
+ private Mat src = new Mat();
+ private Mat srcGray = new Mat();
+ private Mat harrisDst = new Mat();
+ private Mat shiTomasiDst = new Mat();
+ private Mat harrisCopy = new Mat();
+ private Mat shiTomasiCopy = new Mat();
+ private Mat Mc = new Mat();
+ private JFrame frame;
+ private JLabel harrisImgLabel;
+ private JLabel shiTomasiImgLabel;
+ private static final int MAX_QUALITY_LEVEL = 100;
+ private int qualityLevel = 50;
+ private double harrisMinVal;
+ private double harrisMaxVal;
+ private double shiTomasiMinVal;
+ private double shiTomasiMaxVal;
+ private Random rng = new Random(12345);
+
+ public CornerDetector(String[] args) {
+ /// Load source image and convert it to gray
+ String filename = args.length > 0 ? args[0] : "../data/building.jpg";
+ src = Imgcodecs.imread(filename);
+ if (src.empty()) {
+ System.err.println("Cannot read image: " + filename);
+ System.exit(0);
+ }
+
+ Imgproc.cvtColor(src, srcGray, Imgproc.COLOR_BGR2GRAY);
+
+ // Create and set up the window.
+ frame = new JFrame("Creating your own corner detector 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);
+
+ /// Set some parameters
+ int blockSize = 3, apertureSize = 3;
+
+ /// My Harris matrix -- Using cornerEigenValsAndVecs
+ Imgproc.cornerEigenValsAndVecs(srcGray, harrisDst, blockSize, apertureSize);
+
+ /* calculate Mc */
+ Mc = Mat.zeros(srcGray.size(), CvType.CV_32F);
+
+ float[] harrisData = new float[(int) (harrisDst.total() * harrisDst.channels())];
+ harrisDst.get(0, 0, harrisData);
+ float[] McData = new float[(int) (Mc.total() * Mc.channels())];
+ Mc.get(0, 0, McData);
+
+ for( int i = 0; i < srcGray.rows(); i++ ) {
+ for( int j = 0; j < srcGray.cols(); j++ ) {
+ float lambda1 = harrisData[(i*srcGray.cols() + j) * 6];
+ float lambda2 = harrisData[(i*srcGray.cols() + j) * 6 + 1];
+ McData[i*srcGray.cols()+j] = (float) (lambda1*lambda2 - 0.04f*Math.pow( ( lambda1 + lambda2 ), 2 ));
+ }
+ }
+ Mc.put(0, 0, McData);
+
+ MinMaxLocResult res = Core.minMaxLoc(Mc);
+ harrisMinVal = res.minVal;
+ harrisMaxVal = res.maxVal;
+
+ /// My Shi-Tomasi -- Using cornerMinEigenVal
+ Imgproc.cornerMinEigenVal(srcGray, shiTomasiDst, blockSize, apertureSize);
+ res = Core.minMaxLoc(shiTomasiDst);
+ shiTomasiMinVal = res.minVal;
+ shiTomasiMaxVal = res.maxVal;
+
+ 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("Max corners:"));
+ JSlider slider = new JSlider(0, MAX_QUALITY_LEVEL, qualityLevel);
+ 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();
+ qualityLevel = source.getValue();
+ update();
+ }
+ });
+ sliderPanel.add(slider);
+ pane.add(sliderPanel, BorderLayout.PAGE_START);
+
+ JPanel imgPanel = new JPanel();
+ harrisImgLabel = new JLabel(new ImageIcon(img));
+ shiTomasiImgLabel = new JLabel(new ImageIcon(img));
+ imgPanel.add(harrisImgLabel);
+ imgPanel.add(shiTomasiImgLabel);
+ pane.add(imgPanel, BorderLayout.CENTER);
+ }
+
+ private void update() {
+ int qualityLevelVal = Math.max(qualityLevel, 1);
+
+ //Harris
+ harrisCopy = src.clone();
+
+ float[] McData = new float[(int) (Mc.total() * Mc.channels())];
+ Mc.get(0, 0, McData);
+ for (int i = 0; i < srcGray.rows(); i++) {
+ for (int j = 0; j < srcGray.cols(); j++) {
+ if (McData[i * srcGray.cols() + j] > harrisMinVal
+ + (harrisMaxVal - harrisMinVal) * qualityLevelVal / MAX_QUALITY_LEVEL) {
+ Imgproc.circle(harrisCopy, new Point(j, i), 4,
+ new Scalar(rng.nextInt(256), rng.nextInt(256), rng.nextInt(256)), Core.FILLED);
+ }
+ }
+ }
+
+ //Shi-Tomasi
+ shiTomasiCopy = src.clone();
+
+ float[] shiTomasiData = new float[(int) (shiTomasiDst.total() * shiTomasiDst.channels())];
+ shiTomasiDst.get(0, 0, shiTomasiData);
+ for (int i = 0; i < srcGray.rows(); i++) {
+ for (int j = 0; j < srcGray.cols(); j++) {
+ if (shiTomasiData[i * srcGray.cols() + j] > shiTomasiMinVal
+ + (shiTomasiMaxVal - shiTomasiMinVal) * qualityLevelVal / MAX_QUALITY_LEVEL) {
+ Imgproc.circle(shiTomasiCopy, new Point(j, i), 4,
+ new Scalar(rng.nextInt(256), rng.nextInt(256), rng.nextInt(256)), Core.FILLED);
+ }
+ }
+ }
+
+ harrisImgLabel.setIcon(new ImageIcon(HighGui.toBufferedImage(harrisCopy)));
+ shiTomasiImgLabel.setIcon(new ImageIcon(HighGui.toBufferedImage(shiTomasiCopy)));
+ frame.repaint();
+ }
+}
+
+public class CornerDetectorDemo {
+ 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 CornerDetector(args);
+ }
+ });
+ }
+}
projects / platform / upstream / opencv.git / commitdiff
