Using Android, what are the open-source option for face recognition.
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java
android
face-recognition
macgyver offers face detection programs via a simple to use API.
The program below takes a reference to a public image and will return an array of the coordinates and dimensions of any faces detected in the image.
https://askmacgyver.com/explore/program/face-location/5w8J9u4z
You can try Microsoft's Face API. It can detect and identify people. learn more about face API here.
You use class media.FaceDetector in android to detect face for free.
This is an example of face detection: https://github.com/betri28/FaceDetectCamera
Source: Stackoverflow.com