ios - 由于图像方向而无法检测图像中的面部

Question

我想使用此代码通过 CIFaceDetector 检测图像中的人脸。

    let Orientation: Int!

    switch ((info[UIImagePickerControllerOriginalImage] as? UIImage)?.imageOrientation)! {
    case UIImageOrientation.up:
        Orientation = 1
    case UIImageOrientation.down:
        Orientation = 3
    case UIImageOrientation.left:
        Orientation = 8
    case UIImageOrientation.right:
        Orientation = 6
    case UIImageOrientation.upMirrored:
        Orientation = 2
    case UIImageOrientation.downMirrored:
        Orientation = 4
    case UIImageOrientation.leftMirrored:
        Orientation = 5
    case UIImageOrientation.rightMirrored:
        Orientation = 7
    }

    let options = [CIDetectorAccuracy: CIDetectorAccuracyHigh, CIDetectorImageOrientation: Orientation] as [String : Any]
    let faceDetector = CIDetector(ofType: CIDetectorTypeFace, context: nil, options: options)
    let faces = faceDetector?.features(in: personciImage)

但是这仅适用于横向。我不知道为什么它在所有其他方向上不起作用。我的意思是方向应该设置正确。我还将 UIImage 转换为 CIImage。

 guard let personciImage = CIImage(image: (info[UIImagePickerControllerOriginalImage] as? UIImage)!) else {
        return
    }

问题出在哪里吗？

Answer 1

来自 CIDetector 配置文档 here看来方向键实际上并不是此类的选项。人脸检测类可能实际上更喜欢您在传递图像之前旋转图像。

旋转图像相当简单，也可以在SO上搜索，我找到了一个简单的例子，但我确信还有更多! quick rotation search example