Draw Ellipse on Image using OpenCV

OpenCV provides many functions to draw geometric shapes such as line, rectangle, circle, etc.

The ellipse function can be used to draw ellipse or ellipse arc by providing x and y center coordinates, axes length, angle and other parameters.

import cv2
import numpy as np

img = np.zeros((100, 300, 3), dtype=np.uint8)

center = (150, 50)
axes = (60, 30)
angle = 0
startAngle = 0
endAngle = 360
color = (0, 255, 0)
thickness = 2
cv2.ellipse(img, center, axes, angle, startAngle, endAngle, color, thickness)

cv2.imshow('Image', img)
cv2.waitKey(0)
cv2.destroyAllWindows()

#include <opencv2/opencv.hpp>

using namespace cv;

int main()
{
    Mat img = Mat::zeros(100, 300, CV_8UC3);

    Point center(150, 50);
    Size axes(60, 30);
    int angle = 0;
    int startAngle = 0;
    int endAngle = 360;
    Scalar color(0, 255, 0);
    int thickness = 2;
    ellipse(img, center, axes, angle, startAngle, endAngle, color, thickness);

    imshow("Image", img);
    waitKey(0);
    destroyAllWindows();

    return 0;
}

package app;

import org.opencv.core.*;
import org.opencv.highgui.HighGui;
import org.opencv.imgproc.Imgproc;

public class Main
{
    static { System.loadLibrary(Core.NATIVE_LIBRARY_NAME); }

    public static void main(String[] args)
    {
        Mat img = Mat.zeros(100, 300, CvType.CV_8UC3);

        Point center = new Point(150, 50);
        Size axes = new Size(60, 30);
        int angle = 0;
        int startAngle = 0;
        int endAngle = 360;
        Scalar color = new Scalar(0, 255, 0);
        int thickness = 2;
        Imgproc.ellipse(img, center, axes, angle, startAngle, endAngle, color, thickness);

        HighGui.imshow("Image", img);
        HighGui.waitKey(0);
        HighGui.destroyAllWindows();

        System.exit(0);
    }
}

Result: