FaceDetection

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.highgui.Highgui;
import org.opencv.objdetect.CascadeClassifier;

//
// Detects faces in an image, draws boxes around them, and writes the results
// to "faceDetection.png".
//
class DetectFaceDemo {

    public void run() {
        System.out.println("\nRunning DetectFaceDemo");

    // Create a face detector from the cascade file in the resources
        // directory.
        CascadeClassifier faceDetector = new CascadeClassifier("C:\\opencv\\sources\\data\\lbpcascades\\lbpcascade_frontalface.xml");
        //CascadeClassifier faceDetector = new CascadeClassifier("C:\\opencv\\sources\\data\\lbpcascades\\haarcascade_frontalface_alt.xml");
        //Mat image = Highgui.imread("C:\\opencv\\shekhar.JPG");
        Mat image = Highgui.imread("FotoTest1.jpg");

    // Detect faces in the image.
        // MatOfRect is a special container class for Rect.
        MatOfRect faceDetections = new MatOfRect();
        faceDetector.detectMultiScale(image, faceDetections);

        System.out.println(String.format("Detected %s faces", faceDetections.toArray().length));

        // Draw a bounding box around each face.
        for (Rect rect : faceDetections.toArray()) {
            Core.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height), new Scalar(0, 255, 0));
        }

        // Save the visualized detection.
        String filename = "faceDetection.png";
        System.out.println(String.format("Writing %s", filename));
        Highgui.imwrite(filename, image);
    }
}

public class OCV_FaceDetection {

    public static void main(String[] args) {
        System.out.println("Hello, OpenCV");

        // Load the native library.
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        new DetectFaceDemo().run();
    }
}