CIDetector , detected face image is not showing? - ios

Question

I am using CIDetector to detect face in a UIImage. i am getting the face rect correctly but when i crop the image to detected face rect. it is not showing on my image view.
I have already checked. my image is not nil
Here is my code :-
#IBAction func detectFaceOnImageView(_: UIButton) {
let image = myImageView.getFaceImage()
myImageView.image = image
}
extension UIView {
func getFaceImage() -> UIImage? {
let faceDetectorOptions: [String: AnyObject] = [CIDetectorAccuracy: CIDetectorAccuracyHigh as AnyObject]
let faceDetector: CIDetector = CIDetector(ofType: CIDetectorTypeFace, context: nil, options: faceDetectorOptions)!
let viewScreenShotImage = generateScreenShot(scaleTo: 1.0)
if viewScreenShotImage.cgImage != nil {
let sourceImage = CIImage(cgImage: viewScreenShotImage.cgImage!)
let features = faceDetector.features(in: sourceImage)
if features.count > 0 {
var faceBounds = CGRect.zero
var faceImage: UIImage?
for feature in features as! [CIFaceFeature] {
faceBounds = feature.bounds
let faceCroped: CIImage = sourceImage.cropping(to: faceBounds)
faceImage = UIImage(ciImage: faceCroped)
}
return faceImage
} else {
return nil
}
} else {
return nil
}
}
func generateScreenShot(scaleTo: CGFloat = 3.0) -> UIImage {
let rect = self.bounds
UIGraphicsBeginImageContextWithOptions(rect.size, false, 0.0)
let context = UIGraphicsGetCurrentContext()
self.layer.render(in: context!)
let screenShotImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
let aspectRatio = screenShotImage.size.width / screenShotImage.size.height
let resizedScreenShotImage = screenShotImage.scaleImage(toSize: CGSize(width: self.bounds.size.height * aspectRatio * scaleTo, height: self.bounds.size.height * scaleTo))
return resizedScreenShotImage!
}
}
For More Information, I am attaching Screen Shots of values .
Screen Shot 1
Screen Shot 2
Screen Shot 3

Answer 1

Try this:
let faceCroped: CIImage = sourceImage.cropping(to: faceBounds)
//faceImage = UIImage(ciImage: faceCroped)
let cgImage: CGImage = {
let context = CIContext(options: nil)
return context.createCGImage(faceCroped, from: faceCroped.extent)!
}()
faceImage = UIImage(cgImage: cgImage)