code: def _show_corners(self, image, corners):
          
          temp = image
          cv2.drawChessboardCorners(temp, (self.rows, self.columns), corners,
                                    True)
          window_name = "Chessboard"
          cv2.imshow(window_name, temp)
          if cv2.waitKey(0):
              cv2.destroyWindow(window_name)
docs: Show chessboard corners found in image.