Android的摄像机2人脸识别 [英] Android camera2 face recognition

问题描述

有没有关于摄像机2脸部识别机制足够的信息。我用摄像机2样品从谷歌：
     https://github.com/googlesamples/android-Camera2Basic 。

There is not enough info about camera2 face recognition mechanism. I used Camera2 sample from Google: https://github.com/googlesamples/android-Camera2Basic.

我设置人脸识别模式为FULL。

I set face recognition mode to FULL.

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

此外，我检查STATISTICS_INFO_MAX_FACE_COUNT和STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES：

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);

输出： MAXCOUNT：5，模式：[0,2] 的

我CaptureCallback：

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);
    }

输出：面孔：0，模式：2 的

 public static final int STATISTICS_FACE_DETECT_MODE_FULL = 2;

面长度为0不断看起来它不能正确识别到脸部或我错过了什么。

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

我知道有 FaceDetector 方法。我只是想检查它是如何工作的新的摄像机2 面。

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

推荐答案

我的企图是在Android 5.0（API 21）。更新到5.1（API 22）之后，它开始没有code变化的工作。

My attempts were on android 5.0(API 21). After update to 5.1(API 22) it started working without code changes.

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