Nrthugu

 public EllipseParam detectAndDisplay(BufferedImage img, CascadeClassifier faceCascade) {

   // EllipseParam openCV;

    Point center = null;

    double width = 0;

    double height = 0;



    Mat image = ImagePreProcessing.bufferedImageToMat(img);



    // -- Detect faces

    MatOfRect faces = new MatOfRect(); 

    faceCascade.detectMultiScale(image, faces);



    List<Rect> listOfFaces = faces.toList();

    for (Rect face : listOfFaces) {

        center = new Point(face.x + face.width * 0.5, face.y + face.height * 0.5);

        width = face.width*0.5;

        height = face.height*0.5;



        System.out.println("OpenCV: " +center);

        System.out.println("wid:" +width);

        System.out.println("hei:" +height);

        EllipseParam openCV = new EllipseParam(center, width, height);

        System.out.println("value on EllipseParam: " +String.valueOf(openCV));

        return openCV;

    }

    return null;

}

----- in the EllipseParam class

public class EllipseParam {

public double x;

public double y;

public double a;

public double b;

public double theta;

public Point center;

public double width;

public double height;



public EllipseParam(double x,double y,double a,double b,double theta){

    this.x = x;

    this.y = y;

    this.a = a;

    this.b = b;

    this.theta = theta;

}



public EllipseParam(Point center, double width, double height){

    //this.image = image;

    this.center = center;

    this.width = width;

    this.height = height;

}

I try to setting parameter and getting that, but output I got is like this:

OpenCV: {196.5, 156.5}

wid:147.5

hei:147.5

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

value on EllipseParam: entity.EllipseParam@d34c4b

What is wrong with my code?

I read the answer, but its not solve my issue actually. Can you explain to me more?