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How to draw an ellipse in OpenCV using Java?
The org.opencv.imgproc package of Java OpenCV library contains a class named Imgproc. To draw an ellipse you need to invoke the ellipse() method of this class. This method accepts the following parameters −
A Mat object representing the image on which the ellipse is to be drawn.
A RotatedRect object (The ellipse is drawn inscribed in this rectangle.)
A Scalar object representing the color of the Rectangle(BGR).
An integer representing the thickness of the Rectangle(default:1).
Example
import org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.core.Point; import org.opencv.core.RotatedRect; import org.opencv.core.Scalar; import org.opencv.core.Size; import org.opencv.highgui.HighGui; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; public class DrawingEllipse { public static void main(String args[]) { //Loading the OpenCV core library System.loadLibrary( Core.NATIVE_LIBRARY_NAME ); //Reading the source image in to a Mat object Mat src = Imgcodecs.imread("D:\images\blank.jpg"); //Drawing an Ellipse RotatedRect box = new RotatedRect(new Point(300, 200), new Size(260, 180), 180); Scalar color = new Scalar(64, 64, 64); int thickness = 10; Imgproc.ellipse (src, box, color, thickness); //Saving and displaying the image Imgcodecs.imwrite("arrowed_line.jpg", src); HighGui.imshow("Drawing an ellipse", src); HighGui.waitKey(); } }
Output
On executing, the above program generates the following window −
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