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In my application, I use OpenCV for face detection throw ImageReader and jni. It works ok, but performance of that solution isn't so good as I wanted, also I want to reduce size of my app. I read some information about face detection in camera 2 API, and I have some questions about it.

1) Why the function below can return STATISTICS_FACE_DETECT_MODE_OFF? Not all devices support face detection feature? What type of devices doesn't support it and why? Do you know any examples of unsupported devices? In my project, I use only front facing camera, does it matter to me?

characteristics.get(CameraCharacteristics.STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES);

2) What about performance? Is there any performance difference between STATISTICS_FACE_DETECT_MODE_FULL and STATISTICS_FACE_DETECT_MODE_SIMPLE?

Данил Вагапов
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    In my experience, the built-in camera2 face detection is not a match to OpenCV. But maybe, on latest devices with extra AI capabilities, its results are more reliable. At any rate, it is much faster than OpenCV. – Alex Cohn Aug 28 '18 at 19:46
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    You might find some more hints in this discussion: *[Android camera2 face recognition](https://stackoverflow.com/questions/30334319/android-camera2-face-recognition)* – Alex Cohn Aug 30 '18 at 07:44

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