从零开发一款相机APP 第十四篇: 人脸识别

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//获取支持的人脸检测模式
int[] faceDetectModes = Characteristics.get(CameraCharacteristics
                    .STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES)；
 
//支持最大检测人脸数量
 Characteristics.get(CameraCharacteristics.STATISTICS_INFO_MAX_FACE_COUNT);
 int mFaceDetectMode = CaptureRequest.STATISTICS_FACE_DETECT_MODE_OFF;
 
for (int i = 0; i < faceDetectModes.length; i++) {
     int face = faceDetectModes[i];
      //判断人脸支持程度级别
     if (face == CaptureRequest.STATISTICS_FACE_DETECT_MODE_FULL || face == CaptureRequest.STATISTICS_FACE_DETECT_MODE_SIMPLE) {
                    Log.i(TAG, "相机硬件支持人脸检测---" + face);
                    mFaceDetectMode = CaptureRequest.STATISTICS_FACE_DETECT_MODE_FULL;
                    break;
                }
            }
            if (mFaceDetectMode == CaptureRequest.STATISTICS_FACE_DETECT_MODE_OFF) {
                Log.i(TAG, "相机硬件不支持人脸检测");
                return;
            }

previewRequestBuilder.set(CaptureRequest.STATISTICS_FACE_DETECT_MODE, 
                 CameraCharacteristics.STATISTICS_FACE_DETECT_MODE_SIMPLE);//设置人脸检测级别

Face faces[] = result.get(CaptureResult.STATISTICS_FACES);
if (faces.length > 0) {
     //检测到有人脸，控制相机进行拍照操作
 }