Example usage for org.opencv.core Core fastAtan2

Introduction

In this page you can find the example usage for org.opencv.core Core fastAtan2.

Prototype

public static float fastAtan2(float y, float x) 

Source Link

Usage

From source file:ch.zhaw.facerecognitionlibrary.Helpers.FaceDetection.java

License:Open Source License

public Eyes getEyes(Mat img) {
    double halfWidth = img.cols() / 2;
    double height = img.rows();
    double[] values = new double[4];
    values[0] = 0;/* w  w  w.j a  v a 2s .c o  m*/
    values[1] = 0;
    values[2] = halfWidth;
    values[3] = height;
    Rect rightHalf = new Rect(values);
    values[0] = halfWidth;
    Rect leftHalf = new Rect(values);
    MatOfRect rightEyes = new MatOfRect();
    MatOfRect leftEyes = new MatOfRect();

    Mat rightHalfImg = img.submat(rightHalf);
    rightEyeDetector.detectMultiScale(rightHalfImg, rightEyes);
    Mat leftHalfImg = img.submat(leftHalf);
    leftEyeDetector.detectMultiScale(leftHalfImg, leftEyes);

    if (rightEyes.empty() || leftEyes.empty() || rightEyes.toArray().length > 1
            || leftEyes.toArray().length > 1) {
        return null;
    }

    Rect rightEye = rightEyes.toArray()[0];
    Rect leftEye = leftEyes.toArray()[0];

    MatOfFloat rightPoint = new MatOfFloat(rightEye.x + rightEye.width / 2, rightEye.y + rightEye.height / 2);
    MatOfFloat leftPoint = new MatOfFloat(img.cols() / 2 + leftEye.x + leftEye.width / 2,
            leftEye.y + leftEye.height / 2);

    MatOfFloat diff = new MatOfFloat();
    Core.subtract(leftPoint, rightPoint, diff);
    double angle = Core.fastAtan2(diff.toArray()[1], diff.toArray()[0]);
    double dist = Core.norm(leftPoint, rightPoint, Core.NORM_L2);
    Eyes eyes = new Eyes(dist, rightPoint, leftPoint, angle);
    return eyes;
}

---