Real time face detection is not working

Question

This code does not show the detection of face in camera, even there is no error. I want the face should be detected in realtime in camera with red squire surrounded, but I

Answer 1

After looking through your code, you didn't even call detect() after you take a snap. I tried fixed it as described below, however, the detect() will return zero face found as I describe in Face Detection with Camera.

lazy var picker: UIImagePickerController = {
    let picker = UIImagePickerController()
    picker.delegate = self
    picker.allowsEditing = true
    picker.sourceType = .camera
    picker.cameraDevice = .front
    return picker
}()

@IBOutlet var imageView: UIImageView!
override func viewDidLoad() {
    super.viewDidLoad()
    imageView.contentMode = .scaleAspectFit
}

@IBAction func TakePhoto(_ sender: Any) {
    self.present(picker, animated: true, completion: nil)
}

// MARK: - UIImagePickerControllerDelegate
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let chosenImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
        self.imageView!.image = chosenImage
        // Got the image from camera, the imageView.image is not nil, so it's time for facial detection
        detect()
        picker.dismiss(animated: true, completion: nil)
    }
}


func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
    picker.dismiss(animated: true, completion: nil)
}

// MARK: - Face Detection

func detect() {

    guard let personciImage = CIImage(image: imageView.image!) else {
        return
    }

    let accuracy = [CIDetectorAccuracy: CIDetectorAccuracyHigh]
    let faceDetector = CIDetector(ofType: CIDetectorTypeFace, context: nil, options: accuracy)
    let faces = faceDetector?.features(in: personciImage)


    // For converting the Core Image Coordinates to UIView Coordinates
    let ciImageSize = personciImage.extent.size
    var transform = CGAffineTransform(scaleX: 1, y: -1)
    transform = transform.translatedBy(x: 0, y: -ciImageSize.height)
    print("faces.count = \(faces?.count)")

    for face in faces as! [CIFaceFeature] {

        print("Found bounds are \(face.bounds)")

        // Apply the transform to convert the coordinates
        var faceViewBounds = face.bounds.applying(transform)

        // Calculate the actual position and size of the rectangle in the image view
        let viewSize = imageView.bounds.size
        let scale = min(viewSize.width / ciImageSize.width,
                        viewSize.height / ciImageSize.height)
        let offsetX = (viewSize.width - ciImageSize.width * scale) / 2
        let offsetY = (viewSize.height - ciImageSize.height * scale) / 2

        faceViewBounds = faceViewBounds.applying(CGAffineTransform(scaleX: scale, y: scale))
        faceViewBounds.origin.x += offsetX
        faceViewBounds.origin.y += offsetY

        let faceBox = UIView(frame: faceViewBounds)
        //let faceBox = UIView(frame: face.bounds)
        faceBox.layer.borderWidth = 3
        faceBox.layer.borderColor = UIColor.red.cgColor
        faceBox.backgroundColor = UIColor.clear
        imageView.addSubview(faceBox)

        if face.hasLeftEyePosition {
            print("Left eye bounds are \(face.leftEyePosition)")
        }

        if face.hasRightEyePosition {
            print("Right eye bounds are \(face.rightEyePosition)")
        }
    }
}