/ Miscellaneous

Face detection for your Android app

Face detection for your Android app

FaceDetector

Want to detect human faces on a camera preview stream in real time? Well, you came to the right place.

Want-to-detect-human-faces

FaceDetector is a library which:

  • detects faces
  • works on Android
  • very simple to use
  • works greatly with Fotoapparat
  • you can use it with whichever camera library or source you like
  • uses C++ core which can easily be ported to iOS (we have plans for that)

Detecting faces with Fotoapparat is as simple as:

Fotoapparat
    .with(context)
    .into(cameraView)
    .frameProcessor(
      FaceDetectorProcessor
        .with(context)
        .build()
    )
    .build()

How it works

Step One (optional)

To display detected faces on top of the camera view, set up your layout as following.

<io.fotoapparat.facedetector.view.CameraOverlayLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    <!-- Adjust parameters as you like. But cameraView has to be inside CameraOverlayLayout -->
    <io.fotoapparat.view.CameraView
        android:id="@+id/cameraView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <!-- This view will display detected faces -->
    <io.fotoapparat.facedetector.view.RectanglesView
        android:id="@+id/rectanglesView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:rectanglesColor="@color/colorAccent"
        app:rectanglesStrokeWidth="2dp"/>

</io.fotoapparat.facedetector.view.CameraOverlayLayout>

Step Two

Create FaceDetectorProcessor:

Java:

FaceDetectorProcessor processor = FaceDetectorProcessor.with(this)
    .listener(faces -> {
        rectanglesView.setRectangles(faces);  // (Optional) Show detected faces on the view.

        // ... or do whatever you want with the result
    })
    .build()

or Kotlin:

private val processor = FaceDetectorProcessor.with(this)
    .listener({ faces ->
        rectanglesView.setRectangles(faces)  // (Optional) Show detected faces on the view.

        // ... or do whatever you want with the result
    })
    .build()

Step Three

Attach the processor to Fotoapparat

Fotoapparat.with(this)
    .into(cameraView)
    // the rest of configuration
    .frameProcessor(processor)
    .build()

And you are good to go!

Set up

Add dependency to your build.gradle

repositories {
    maven { 
        url  "http://dl.bintray.com/fotoapparat/fotoapparat" 
    }
}

implementation 'io.fotoapparat:facedetector:1.0.0'

// If you are using Fotoapparat add this one as well
implementation 'io.fotoapparat.fotoapparat:library:1.2.0' // or later version

GitHub