IOS CoreImage 全方位人脸检测

Question

我在 IOS 上使用 CoreImage 来检测图像中的人脸。当有多个面孔时它工作正常，但不适用于像这样的简单面孔：

脸真的很大很明显，但是CoreImage检测不到。我想这可能是因为我的 kCGImagePropertyOrientation.

我将其设置为 5，仅仅是因为在线教程就是这样做的。但是，我正在处理的图像是用户上传的，所以我事先不知道脸部的方向。有没有办法尝试所有方向？当事先不知道图像时，实施 CoreImage 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

IOS CoreImage 全方位人脸检测

IOS CoreImage Facial Detection at All Orientations

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