Cannot assign value of type 'NSObject' file to type 'UIImage' - Apple Swift - arrays

Question

I'm trying to create a photo album via UIImagePicker into a CollectionView and cannot get it to segue to said photo again in a detailed UIViewController. Pulling my hair out and this is just a tutorial as I have just started coding!
Can anyone tell me what I'm doing wrong?
var testItems = [Person]()
#IBAction func addItem() {
addNewPerson()
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "DetailSegue" {
if let dest = segue.destination as? DetailsViewController,
let index = sender as? IndexPath {
dest.detailedImageHi = testItems[index.row]
}
}
}
THE NS OBJECT FILE IS AS FOLLOWS:
class Person: NSObject {
var imageHi: String
init(imageHi: String){
self.imageHi = imageHi
}
}
DetailsViewController:
class DetailsViewController: UIViewController {
var selection: String!
var detailedImageHi: UIImage!
#IBOutlet private weak var detailsLabel: UILabel!
#IBOutlet private weak var detailedImage: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
detailsLabel.text = selection
detailedImage.image = detailedImageHi
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
import UIKit
class CollectionViewCell: UICollectionViewCell {
#IBOutlet weak var titleLabel: UILabel!
#IBOutlet weak var selectionImage: UIImageView!
}