各方位的IOS CoreImage面部检测

Question

我CoreImage在IOS上使用它来检测图像中的面部.当有多个面时,它可以正常工作,但不适用于这样的简单面:

脸很大很明显,但CoreImage无法察觉.我想这可能是因为我的kCGImagePropertyOrientation.

我把它设置为5,因为这就是在线教程所做的.但是,我正在处理的图像是用户上传的,所以我事先并不知道脸部的方向.有没有办法尝试所有方向？CoreImage当手头不知道图像时,实施面部检测的正确方法是什么？

这是我的代码:

var imageOptions = Dictionary<String,Any>()
imageOptions[CIDetectorImageOrientation] = 5
imageOptions[CIDetectorSmile] = true

let image = CIImage(cgImage: imageView.image!.cgImage!)
let accuracy = [CIDetectorAccuracy: CIDetectorAccuracyHigh]

let faceDetector = CIDetector(ofType: CIDetectorTypeFace, context: nil, options: accuracy)
let faces = faceDetector?.features(in: image, options: imageOptions as? [String : AnyObject])

Answer 1

你可以这样做

   var imageOrienttion = 0
   switch (YourUIImage.imageOrientation) {
    case UIImageOrientation.up:
        imageOrienttion = 1
        break;
    case UIImageOrientation.down:
        imageOrienttion = 3
        break;
    case UIImageOrientation.left:
        imageOrienttion = 8
        break;
    case UIImageOrientation.right:
        imageOrienttion = 6
        break;
    case UIImageOrientation.upMirrored:
        imageOrienttion = 2
        break;
    case UIImageOrientation.downMirrored:
        imageOrienttion = 4
        break;
    case UIImageOrientation.leftMirrored:
        imageOrienttion = 5
        break;
    case UIImageOrientation.rightMirrored:
        imageOrienttion = 7
        break;
   }
   imageOptions[CIDetectorImageOrientation] = imageOrienttion