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How to draw a circle in OpenCV using Java?
The org.opencv.imgproc package of Java OpenCV library contains a class named Imgproc.
To draw a circle you need to invoke the circle() method of this class. This method accepts the following parameters −
A Mat object representing the image on which the circle is to be drawn.
A Point object representing the center of the circle.
An integer variable representing the radius of the circle.
A Scalar object representing the color of the circle(BGR).
An integer representing the thickness of the circle(default 1).
Example
import org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.core.Point; import org.opencv.core.Scalar; import org.opencv.highgui.HighGui; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; public class DrawingCircle { 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 String file ="D:\images\blank.jpg"; Mat src = Imgcodecs.imread(file); //Drawing a Circle Point center = new Point(300, 200); int radius = 100; Scalar color = new Scalar(64, 64, 64); int thickness = 10; Imgproc.circle (src, center, radius, color, thickness); //Saving and displaying the image Imgcodecs.imwrite("circle.jpg", src); HighGui.imshow("Drawing a Circle", src); HighGui.waitKey(); } }
Output
On executing, the above program generates the following window −
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