- Trending Categories
- Data Structure
- Networking
- RDBMS
- Operating System
- Java
- MS Excel
- iOS
- HTML
- CSS
- Android
- Python
- C Programming
- C++
- C#
- MongoDB
- MySQL
- Javascript
- PHP
- Physics
- Chemistry
- Biology
- Mathematics
- English
- Economics
- Psychology
- Social Studies
- Fashion Studies
- Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to draw a rectangle in OpenCV using Java?
The org.opencv.imgproc package of Java OpenCV library contains a class named Imgproc. To draw a rectangle you need to invoke the rectangle() method of this class. This method accepts the following parameters −
A Mat object representing the image on which the rectangle is to be drawn.
Two Point objects representing the vertices of the rectangle that is to be drawn.
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.Scalar; import org.opencv.highgui.HighGui; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; public class DrawingRectangle { public static void main(String args[]) { // Loading the OpenCV core library System.loadLibrary( Core.NATIVE_LIBRARY_NAME ); //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 a Rectangle Point point1 = new Point(100, 100); Point point2 = new Point(500, 300); Scalar color = new Scalar(64, 64, 64); int thickness = 10; Imgproc.rectangle (src, point1, point2, color, thickness); //Saving and displaying the image Imgcodecs.imwrite("arrowed_line.jpg", src); HighGui.imshow("Drawing a rectangle", src); HighGui.waitKey(); } }
Output
On executing, the above program generates the following window −
Advertisements