How to flip an image using Java OpenCV library?

The flip() method of OpenCV's Core class can flip the image along the x/y axis. The method accepts the following parameters:

• Source matrix, containing the data of the original image.

• An empty target matrix used to hold the data of the result image.

• A flip code that specifies the orientation of the image (0 means flipping along the x-axis, a positive number means flipping along the y-axis, and a negative number means flipping along both axes at the same time).

To flip the image, you can follow these steps:

• Use the loadLibrary() method to load the OpenCV core native library.

• Use the imread() method to read the contents of the image file into the matrix.

• Create an empty matrix to hold the results.

• Call the flip() method by passing the matrix created above.

• Use the imwrite() method to create the image, passing the target matrix as a parameter.

Example

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.imgcodecs.Imgcodecs;
public class ChangingOrientation {
   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 ="D:\Images\cat.jpg";
      Mat src = Imgcodecs.imread(file);
      //Creating an empty matrix to store the result
      Mat dst = new Mat();
      //Changing the orientation of an image
      Core.flip(src, dst, -1);
      //Writing the image
      Imgcodecs.imwrite("D:\Images\flipping.jpg", dst);
      System.out.println("Image Processed");
   }
}

Enter

Output

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