+import java.util.List;
+
+import org.opencv.core.Core;
+import org.opencv.core.Mat;
+import org.opencv.core.MatOfRect;
+import org.opencv.core.Point;
+import org.opencv.core.Rect;
+import org.opencv.core.Scalar;
+import org.opencv.core.Size;
+import org.opencv.highgui.HighGui;
+import org.opencv.imgproc.Imgproc;
+import org.opencv.objdetect.CascadeClassifier;
+import org.opencv.videoio.VideoCapture;
+
+class ObjectDetection {
+ public void detectAndDisplay(Mat frame, CascadeClassifier faceCascade, CascadeClassifier eyesCascade) {
+ Mat frameGray = new Mat();
+ Imgproc.cvtColor(frame, frameGray, Imgproc.COLOR_BGR2GRAY);
+ Imgproc.equalizeHist(frameGray, frameGray);
+
+ // -- Detect faces
+ MatOfRect faces = new MatOfRect();
+ faceCascade.detectMultiScale(frameGray, faces);
+
+ List<Rect> listOfFaces = faces.toList();
+ for (Rect face : listOfFaces) {
+ Point center = new Point(face.x + face.width / 2, face.y + face.height / 2);
+ Imgproc.ellipse(frame, center, new Size(face.width / 2, face.height / 2), 0, 0, 360,
+ new Scalar(255, 0, 255));
+
+ Mat faceROI = frameGray.submat(face);
+
+ // -- In each face, detect eyes
+ MatOfRect eyes = new MatOfRect();
+ eyesCascade.detectMultiScale(faceROI, eyes);
+
+ List<Rect> listOfEyes = eyes.toList();
+ for (Rect eye : listOfEyes) {
+ Point eyeCenter = new Point(face.x + eye.x + eye.width / 2, face.y + eye.y + eye.height / 2);
+ int radius = (int) Math.round((eye.width + eye.height) * 0.25);
+ Imgproc.circle(frame, eyeCenter, radius, new Scalar(255, 0, 0), 4);
+ }
+ }
+
+ //-- Show what you got
+ HighGui.imshow("Capture - Face detection", frame );
+ }
+
+ public void run(String[] args) {
+ String filenameFaceCascade = args.length > 2 ? args[0] : "../../data/haarcascades/haarcascade_frontalface_alt.xml";
+ String filenameEyesCascade = args.length > 2 ? args[1] : "../../data/haarcascades/haarcascade_eye_tree_eyeglasses.xml";
+ int cameraDevice = args.length > 2 ? Integer.parseInt(args[2]) : 0;
+
+ CascadeClassifier faceCascade = new CascadeClassifier();
+ CascadeClassifier eyesCascade = new CascadeClassifier();
+
+ if (!faceCascade.load(filenameFaceCascade)) {
+ System.err.println("--(!)Error loading face cascade: " + filenameFaceCascade);
+ System.exit(0);
+ }
+ if (!eyesCascade.load(filenameEyesCascade)) {
+ System.err.println("--(!)Error loading eyes cascade: " + filenameEyesCascade);
+ System.exit(0);
+ }
+
+ VideoCapture capture = new VideoCapture(cameraDevice);
+ if (!capture.isOpened()) {
+ System.err.println("--(!)Error opening video capture");
+ System.exit(0);
+ }
+
+ Mat frame = new Mat();
+ while (capture.read(frame)) {
+ if (frame.empty()) {
+ System.err.println("--(!) No captured frame -- Break!");
+ break;
+ }
+
+ //-- 3. Apply the classifier to the frame
+ detectAndDisplay(frame, faceCascade, eyesCascade);
+
+ if (HighGui.waitKey(10) == 27) {
+ break;// escape
+ }
+ }
+
+ System.exit(0);
+ }
+}
+
+public class ObjectDetectionDemo {
+ public static void main(String[] args) {
+ // Load the native OpenCV library
+ System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
+
+ new ObjectDetection().run(args);
+ }
+}