How to draw an arrowed line in OpenCV using Java?

The org.opencv.imgproc package of Java OpenCV library contains a class named Imgproc this class provides various methods to process an input image. It provides a set of methods to draw geometrical shapes on images.

To draw an arrowed line you need to invoke the arrowedLine() method of this class. This method accepts the following parameters −

  • A Mat object representing the image on which the line is to be drawn.

  • Two Point objects representing the points between which the line is to be drawn.

  • A Scalar object representing the color of the line. (BGR)

  • An integer representing the thickness of the line(default:1).


import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.Point;
import org.opencv.core.Scalar;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
import org.opencv.highgui.HighGui;
public class DrawingArrowedLine {
   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
      Point start = new Point(100, 200);
      Point end = new Point(500, 200);
      Scalar color = new Scalar(64, 64, 64);
      int thickness = 10;
      Imgproc.arrowedLine(src, start, end, color, thickness);
      //Saving and displaying the image
      Imgcodecs.imwrite("arrowed_line.jpg", src);
      HighGui.imshow("Drawing an arrowed line", src);


On executing, the above program generates the following window −

Updated on: 10-Apr-2020


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