实时面部检测不起作用 [英] Real time face detection is not working

问题描述

此代码未显示相机中的脸部检测，即使没有错误。
我希望脸部应该在红色绅士的环绕下实时检测，但我想我没有正确放置代码或者我应该在Viewdidload或其他地方放置什么东西？

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 think I have not placed the code properly or where I should place something in Viewdidload or something else?

import UIKit
import CoreImage

class ViewController: UIViewController ,UIAlertViewDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate  {

@IBOutlet var imageView: UIImageView!
@IBAction func Moodify(_ sender: UIButton) {


    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)

        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)")
            }
        }
    }

    let picker = UIImagePickerController()
    picker.delegate = self
    picker.allowsEditing = true
    picker.sourceType = .camera
    picker.cameraDevice = .front
    self.present(picker, animated: true, completion: { _ in })

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [AnyHashable: Any]) {
        let chosenImage = info[UIImagePickerControllerEditedImage]
        self.imageView!.image = chosenImage as? UIImage
        picker.dismiss(animated: true, completion: { _ in })
    }

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

override func viewDidLoad() {

    let alert = UIAlertController(title: "Ooops!!!", message: "Camera is not connected", preferredStyle: UIAlertControllerStyle.alert)
    alert.addAction(UIAlertAction(title: "Connect", style: UIAlertActionStyle.default, handler: nil))
    self.present(alert, animated: true, completion: nil)

    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
}

推荐答案

之后通过你的代码查看，你甚至没有调用 detect（）。我尝试修复它，如下所述，然而， detect（）将返回零面部，如我在使用相机进行人脸检测。

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)")
        }
    }
}

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