How to perform Bitwise Not operation on images using Java OpenCV?

You can compute the bitwise conjunction between two images using the bitwise_not() method of the org.opencv.core.Core class.

This method accepts two Mat objects representing the source and destination matrices, calculates the inverse of each element in the source matrix and stores the result in the destination matrix.

Example

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.highgui.HighGui;
import org.opencv.imgcodecs.Imgcodecs;
public class BitwiseNOTExample {
   public static void main(String args[]) throws Exception {
      //Loading the OpenCV core library
      System.loadLibrary( Core.NATIVE_LIBRARY_NAME );
      //Reading the Image
      String file ="D://images//elephant.jpg";
      Mat src = Imgcodecs.imread(file);
      HighGui.imshow("Grayscale Image", src);
      //Creating an empty matrix to store the result
      Mat dst = new Mat(src.rows(), src.cols(), src.type());
      //Applying bitwise not operation
      Core.bitwise_not(src, dst);
      HighGui.imshow("Bitwise NOT operation", dst);
      HighGui.waitKey();
   }
}

Input Image

Output

On executing, the above program generates the following windows −