我正在使用iOS 11的视觉框架实时获取面部标志点。我能够获得面部标志点并用UIBezierPath将其覆盖在相机层上。但是，我想要类似右下角图片中的效果。目前我得到的效果看起来像左边的图片，我尝试循环遍历这些点并添加中点，但我不知道如何从这些点生成所有这些三角形。如何从左边的点生成右边的图？
我不确定我是否可以用我所有的点完成，即使完成了也不会太有帮助，但我也有整个脸部边界框的点。最后，是否有任何框架可以让我识别我需要的所有点，例如openCV或其他东西，请告诉我。谢谢！
这是我一直在使用的代码，来源于https://github.com/DroidsOnRoids/VisionFaceDetection：
func detectLandmarks(on image: CIImage) {
try? faceLandmarksDetectionRequest.perform([faceLandmarks], on: image)
if let landmarksResults = faceLandmarks.results as? [VNFaceObservation] {
for observation in landmarksResults {
DispatchQueue.main.async {
if let boundingBox = self.faceLandmarks.inputFaceObservations?.first?.boundingBox {
let faceBoundingBox = boundingBox.scaled(to: self.view.bounds.size)
//different types of landmarks
let faceContour = observation.landmarks?.faceContour
self.convertPointsForFace(faceContour, faceBoundingBox)
let leftEye = observation.landmarks?.leftEye
self.convertPointsForFace(leftEye, faceBoundingBox)
let rightEye = observation.landmarks?.rightEye
self.convertPointsForFace(rightEye, faceBoundingBox)
let leftPupil = observation.landmarks?.leftPupil
self.convertPointsForFace(leftPupil, faceBoundingBox)
let rightPupil = observation.landmarks?.rightPupil
self.convertPointsForFace(rightPupil, faceBoundingBox)
let nose = observation.landmarks?.nose
self.convertPointsForFace(nose, faceBoundingBox)
let lips = observation.landmarks?.innerLips
self.convertPointsForFace(lips, faceBoundingBox)
let leftEyebrow = observation.landmarks?.leftEyebrow
self.convertPointsForFace(leftEyebrow, faceBoundingBox)
let rightEyebrow = observation.landmarks?.rightEyebrow
self.convertPointsForFace(rightEyebrow, faceBoundingBox)
let noseCrest = observation.landmarks?.noseCrest
self.convertPointsForFace(noseCrest, faceBoundingBox)
let outerLips = observation.landmarks?.outerLips
self.convertPointsForFace(outerLips, faceBoundingBox)
}
}
}
}
}
func convertPointsForFace(_ landmark: VNFaceLandmarkRegion2D?, _ boundingBox: CGRect) {
if let points = landmark?.points, let count = landmark?.pointCount {
let convertedPoints = convert(points, with: count)
let faceLandmarkPoints = convertedPoints.map { (point: (x: CGFloat, y: CGFloat)) -> (x: CGFloat, y: CGFloat) in
let pointX = point.x * boundingBox.width + boundingBox.origin.x
let pointY = point.y * boundingBox.height + boundingBox.origin.y
return (x: pointX, y: pointY)
}
DispatchQueue.main.async {
self.draw(points: faceLandmarkPoints)
}
}
}
func draw(points: [(x: CGFloat, y: CGFloat)]) {
let newLayer = CAShapeLayer()
newLayer.strokeColor = UIColor.blue.cgColor
newLayer.lineWidth = 4.0
let path = UIBezierPath()
path.move(to: CGPoint(x: points[0].x, y: points[0].y))
for i in 0..<points.count - 1 {
let point = CGPoint(x: points[i].x, y: points[i].y)
path.addLine(to: point)
path.move(to: point)
}
path.addLine(to: CGPoint(x: points[0].x, y: points[0].y))
newLayer.path = path.cgPath
shapeLayer.addSublayer(newLayer)
}