How to draw markers on an image using Java OpenCV library?

You can draw markers on the image using the drawMarker() method of the org.opencv.imgproc.Imgproc class. This method accepts the following parameters:

• img − Mat object representing the input image.

• #position − An object of Point class used to specify the position of the mark.

• color − An object of Scalar class used to specify the color of the marker.

• markerType − An integer constant that specifies the type of marker.

• #size − An integer value specifying the size of the marker.

• thickness − An integer value that specifies the thickness of the mark.

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 DrawingMarkers {
   public static void main(String args[]) throws Exception {
      //Loading the OpenCV core library
      System.loadLibrary( Core.NATIVE_LIBRARY_NAME );
      //Reading the contents of the image
      String file ="D:\Images\elephant.jpg";
      Mat src = Imgcodecs.imread(file);
      //Preparing color and position of the marker
      Scalar color = new Scalar(0, 0, 125);
      Point point = new Point(150, 260);
      //Drawing marker
      Imgproc.drawMarker(src, point, color, Imgproc.MARKER_SQUARE, 150, 8, Imgproc.LINE_8);
      HighGui.imshow("Drawing Markers", src);
      HighGui.waitKey();
   }
}

Input picture

Output

The following window is generated when executing the above program-

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