How to change image Orientation in imagePicker (swift3)

How can I change the image orientation when taking a photo using the image picker function. I am not trying to rotate the imageView. I just want the image taken to be displayed in the imageView upside down using the image orientation.

      import UIKit

   class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate   {
   @IBOutlet var displayImage: UIImageView!

  var currentImageView: UIImageView?
   func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
let image = info[UIImagePickerControllerOriginalImage] as! UIImage
self.currentImageView?.image = image
self.dismiss(animated: true)


    @IBAction func takePhoto(_ sender: Any) {

self.currentImageView = self.displayImage

let imagePicker = UIImagePickerController()
imagePicker.delegate = self

imagePicker.sourceType =;
imagePicker.allowsEditing = false
self.present(imagePicker, animated: true, completion: nil)