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How to draw a polygon in OpenCV using Java?
A polygon with all the interior angles less than 180 is known as a convex polygon. The org.opencv.imgproc package of Java OpenCV library contains a class named Imgproc. To draw a polygon you need to invoke the fillConvexPoly() method of this class. This method accepts 3 parameters −
A Mat object representing the image on which the polygon is to be drawn.
A MatOfPoint object points between which the polygon is to be drawn.
A Scalar object representing the color of the polygon.
Example
import org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.core.MatOfPoint; 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 DrawingConvexPolygon { 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 arrowed line MatOfPoint points = new MatOfPoint ( new Point(108, 71), new Point(232, 52), new Point(321, 161), new Point(269, 250), new Point(126, 232), new Point(108, 71) ); Scalar color = new Scalar(64, 64, 64); Imgproc.fillConvexPoly (src, points, color); //Saving and displaying the image Imgcodecs.imwrite("arrowed_line.jpg", src); HighGui.imshow("Drawing an polygon", src); HighGui.waitKey(); } }
Output
On executing, the above program generates the following window −
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