opencv Tutorial => Cascade Classifiers to detect face with Java

Example

Java

Code

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

public class FaceDetector{
 
    public static void main(String[] args) {
 
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME); 
        //Create object
        CascadeClassifier faceDetector = new CascadeClassifier(FaceDetector.class.getResource("haarcascade_frontalface_default.xml").getPath());
       
        //Read image
        Mat image = Highgui.imread("sourceimage.jpg");
       
     /*        
        //Or read from webcam
       
         * Mat image=new Mat();
         *VideoCapture videoCapture=new VideoCapture(0);
         *videoCapture.read(image);
     */
        MatOfRect faceDetections = new MatOfRect();
        //Result list
        faceDetector.detectMultiScale(image, faceDetections);

        for (Rect rect : faceDetections.toArray()) {
            //Draw rectangle on result
     
            Core.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height),
                    new Scalar(0, 255, 0));
        }
        
        //write result
        Highgui.imwrite("result.png", image);
        System.out.println("Succesfull");
    }
    
    
}

Result