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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);
}
}
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