CODEWITHSUNDEEP
javaandroidcamera2
Carlos Alfonso
Carlos Alfonso

Reputation: 21

I can't detect face with camera2

I can't find information about face detection on preview in android.hardware.Camera2, would anybody help me with a complete example?

I saw some questions with camera2 examples in github but I can't understand them.

I used Camera2 sample from Google: https://github.com/googlesamples/android-Camera2Basic.

I set face recognition mode to FULL.

mPreviewRequestBuilder.set(CaptureRequest.STATISTICS_FACE_DETECT_MODE, CameraMetadata.STATISTICS_FACE_DETECT_MODE_FULL);

Also I checked STATISTICS_INFO_MAX_FACE_COUNT and STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES:

int max_count = characteristics.get(
CameraCharacteristics.STATISTICS_INFO_MAX_FACE_COUNT);
int modes [] = characteristics.get(
CameraCharacteristics.STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES); 
 Output: maxCount : 5 , modes : [0, 2]

My CaptureCallback:

private CameraCaptureSession.CaptureCallback mCaptureCallback = new CameraCaptureSession.CaptureCallback() {

private void process(CaptureResult result) {
            Integer mode = result.get(CaptureResult.STATISTICS_FACE_DETECT_MODE);
            Face [] faces = result.get(CaptureResult.STATISTICS_FACES);
            if(faces != null && mode != null)
                Log.e("tag", "faces : " + faces.length + " , mode : " + mode ); 
}

@Override
public void onCaptureProgressed(CameraCaptureSession session, CaptureRequest request,
                                CaptureResult partialResult) {
    process(partialResult);
}

@Override
public void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request,
                               TotalCaptureResult result) {
    process(result);
}     `

Output: faces : 0 , mode : 2

public static final int STATISTICS_FACE_DETECT_MODE_FULL = 2;

Faces length is constantly 0. Looks like it doesn't recognise a face properly or I missed something.

I know approach with FaceDetector. I just wanted to check how it works with new camera2 Face.

I need to detect face on preview of camera2!

Upvotes: 2

Views: 673

Answers (1)

JustASimpleLineOfCode
JustASimpleLineOfCode

Reputation: 35

I think that you can't use CameraMetadata.STATISTICS_FACE_DETECT_MODE_FULL, because some devices do not support this type of face detection. Please, can you verify if your device support STATISTICS_FACE_DETECT_MODE_FULL?

If the answer is "NO", please try to use STATISTICS_FACE_DETECT_MODE_SIMPLE

Look at this Samsung Example https://developer.samsung.com/galaxy/camera#techdocs

There is a sample explaining how to use face detection with camera2 API

Upvotes: 0

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