How to rotate an image using Java

Problem Description

How to rotate an image using Java.

Solution

Following is the program to rotate an image using java.

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.Point;
import org.opencv.core.Size;

import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

public class RotatingAnImage {
   public static void main(String args[]) {

      //Loading the OpenCV core library
      System.loadLibrary( Core.NATIVE_LIBRARY_NAME );
      
      //Reading the Image from the file and storing it in to a Matrix object
      String file = "C:/opencv/logo.jpg";
      Mat src = Imgcodecs.imread(file);

      //Creating an empty matrix to store the result
      Mat dst = new Mat();
   
      //Creating the transformation matrix M
      Mat rotationMatrix = Imgproc.getRotationMatrix2D(new Point(300, 200), 30, 1);

      //Rotating the given image
      Imgproc.warpAffine(src, dst,rotationMatrix, new Size(src.cols(), src.cols()));

      //Writing the image
      Imgcodecs.imwrite("C:/opencv/rotate_output.jpg", dst);
      System.out.println("Image Processed");
   }
}

Input

Output