用CIDetector和CIFaceFeature中的人脸裁剪圆形图像

如何将我作为faceViewBounds收到的框架剪裁成一个围绕脸的大圆圈？ 这就像一个人脸上的徽章。

也许我应该得到faceViewBounds的中心，然后我必须在ImageView.image中find这个中心，然后绘制一个大直径的圆，然后通过逻辑将其余的圆以外的部分剪掉，但是用代码我不知道该怎么做.. 有什么build议么？

func detectFaceFrom(ImageView theImageView: UIImageView) { guard let personImage = CIImage(image: theImageView.image!) else { return } let accuracy = [CIDetectorAccuracy: CIDetectorAccuracyLow] let faceDetector = CIDetector(ofType: CIDetectorTypeFace, context: nil, options: accuracy) let faces = faceDetector?.features(in: personImage) let ciImageSize = personImage.extent.size var transform = CGAffineTransform(scaleX: 1, y: -1) transform = transform.translatedBy(x: 0, y: -ciImageSize.height) if(faces?.count==1){ for face in faces as! [CIFaceFeature] { var faceViewBounds = face.bounds.applying(transform) let viewSize = theImageView.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) faceBox.layer.borderWidth = 3 faceBox.layer.borderColor = UIColor.green.cgColor faceBox.backgroundColor = UIColor.clear drawCircleFromCenter(faceViewBounds.center ??? } return cuttedCircleWithFace }else{ return theImageView.image } } 

我刚刚在Facebook上看到一个广告，我想完成的事情完全一样：

Answer 1

问题是你应该使用你的image.size而不是使用theImageView.bounds.size 。 您还应该处理CIDetectorImageOrientation的function选项。

 func detectFaces(from image: UIImage) -> [UIImage] { guard let ciimage = CIImage(image: image) else { return [] } var orientation: NSNumber { switch image.imageOrientation { case .up: return 1 case .upMirrored: return 2 case .down: return 3 case .downMirrored: return 4 case .leftMirrored: return 5 case .right: return 6 case .rightMirrored: return 7 case .left: return 8 } } return CIDetector(ofType: CIDetectorTypeFace, context: nil, options: [CIDetectorAccuracy: CIDetectorAccuracyLow])? .features(in: ciimage, options: [CIDetectorImageOrientation: orientation]) .flatMap { let rect = $0.bounds.insetBy(dx: -10, dy: -10) let ciimage = ciimage.cropping(to: rect) UIGraphicsBeginImageContextWithOptions(rect.size, false, image.scale) defer { UIGraphicsEndImageContext() } UIImage(ciImage: ciimage).draw(in: CGRect(origin: .zero, size: rect.size)) guard let face = UIGraphicsGetImageFromCurrentImageContext() else { return nil } // now that you have your face image you need to properly apply a circle mask to it let size = face.size let breadth = min(size.width, size.height) let breadthSize = CGSize(width: breadth, height: breadth) UIGraphicsBeginImageContextWithOptions(breadthSize, false, image.scale) defer { UIGraphicsEndImageContext() } guard let cgImage = face.cgImage?.cropping(to: CGRect(origin: CGPoint(x: size.width > size.height ? (size.width-size.height).rounded(.down).divided(by: 2) : 0, y: size.height > size.width ? (size.height-size.width).rounded(.down).divided(by: 2) : 0), size: breadthSize)) else { return nil } let faceRect = CGRect(origin: .zero, size: CGSize(width: min(size.width, size.height), height: min(size.width, size.height))) UIBezierPath(ovalIn: faceRect).addClip() UIImage(cgImage: cgImage).draw(in: faceRect) return UIGraphicsGetImageFromCurrentImageContext() } ?? [] } 

---

 let profilePicture = UIImage(data: try! Data(contentsOf: URL(string:"http://i.stack.imgur.com/Xs4RX.jpg")!))! let faces = detectFaces(from: profilePicture) 

Answer 2

如果你只是想专注于图像内的一张脸。 您应该首先设置一个图像视图并将其掩盖成一个圆圈：

 let image = UIImage(named: "face.jpg") let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 50.0, height: 50.0)) imageView.image = image imageView.contentMode = .scaleAspectFill imageView.layer.cornerRadius = imageView.bounds.height * 0.5 imageView.layer.masksToBounds = true 

接下来运行CIDetector

 func focusOnFace(in imageView: UIImageView) { guard let image = imageView.image, var personImage = CIImage(image: image) else { return } let accuracy = [CIDetectorAccuracy: CIDetectorAccuracyLow] let faceDetector = CIDetector(ofType: CIDetectorTypeFace, context: nil, options: accuracy) // This will just take the first detected face but you can do something more sophisticated guard let face = faceDetector?.features(in: personImage).first as? CIFaceFeature else { return } // Make the facial rect a square so it will mask nicely to a circle (may not be strictly necessary as `CIFaceFeature` bounds is typically a square) var rect = face.bounds rect.size.height = max(face.bounds.height, face.bounds.width) rect.size.width = max(face.bounds.height, face.bounds.width) rect = rect.insetBy(dx: -30, dy: -30) // Adds padding around the face so it's not so tightly cropped // Crop to the face detected personImage = personImage.cropping(to: rect) // Set the new cropped image as the image view image imageView.image = UIImage(ciImage: personImage) } 

例

运行focusOnFace之前：

运行focusOnFace ：

更新示例

运行focusOnFace之前：

运行focusOnFace ：