Androidcamera2人脸检测

Androidcamera2人脸检测

java
// 初始化CameraManager
CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
try {
    // 获取可用的相机列表
    String[] cameraIds = cameraManager.getCameraIdList();
    // 获取第一个相机的ID
    String cameraId = cameraIds[0];
    // 打开相机
    cameraManager.openCamera(cameraId, new CameraDevice.StateCallback() {
        @Override
        public void onOpened(@NonNull CameraDevice camera) {
            // 相机打开成功后的回调函数
            // 创建相机预览请求
            final CaptureRequest.Builder previewRequestBuilder;
            try {
                previewRequestBuilder = camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
            } catch (CameraAccessException e) {
                e.printStackTrace();
                return;
            }
            // 设置预览的Surface
            SurfaceTexture texture = mTextureView.getSurfaceTexture();
            texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
            Surface previewSurface = new Surface(texture);
            previewRequestBuilder.addTarget(previewSurface);
            // 创建人脸检测器
            final FaceDetector faceDetector = new FaceDetector.Builder(context)
                    .setLandmarkType(FaceDetector.ALL_LANDMARKS)
                    .setMode(FaceDetector.FAST_MODE)
                    .setTrackingEnabled(false)
                    .build();
            // 设置人脸检测回调
            faceDetector.setProcessor(new MultiProcessor.Builder<>(new FaceTrackerFactory())
                    .build());
            // 设置预览帧的回调
            camera.setPreviewCallback(new Camera.PreviewCallback() {
                @Override
                public void onPreviewFrame(byte[] data, Camera camera) {
                    // 将预览帧数据转换为Bitmap
                    YuvImage yuvImage = new YuvImage(data, ImageFormat.NV21, mPreviewSize.getWidth(), mPreviewSize.getHeight(), null);
                    ByteArrayOutputStream stream = new ByteArrayOutputStream();
                    yuvImage.compressToJpeg(new Rect(0, 0, mPreviewSize.getWidth(), mPreviewSize.getHeight()), 100, stream);
                    byte[] jpegData = stream.toByteArray();
                    Bitmap bitmap = BitmapFactory.decodeByteArray(jpegData, 0, jpegData.length);
                    // 对预览帧进行人脸检测
                    Frame frame = new Frame.Builder().setBitmap(bitmap).build();
                    SparseArray faces = faceDetector.detect(frame);
                    // 处理检测结果
                    for (int i = 0; i < faces.size(); i++) {
                        Face face = faces.valueAt(i);
                        // 在预览帧上绘制人脸框
                        drawFaceRect(bitmap, face);
                    }
                    // 在界面上显示预览帧
                    mTextureView.setBitmap(bitmap);
                }
            });
            // 创建相机预览会话
            camera.createCaptureSession(Arrays.asList(previewSurface),
                    new CameraCaptureSession.StateCallback() {
                        @Override
                        public void onConfigured(@NonNull CameraCaptureSession session) {
                            // 配置会话成功后的回调函数
                            try {
                                // 设置相机预览请求
                                session.setRepeatingRequest(previewRequestBuilder.build(), null, null);
                            } catch (CameraAccessException e) {
                                e.printStackTrace();
                            }
                        }
                        @Override
                        public void onConfigureFailed(@NonNull CameraCaptureSession session) {
                            // 配置会话失败后的回调函数
                        }
                    }, null);
        }
        @Override
        public void onDisconnected(@NonNull CameraDevice camera) {
            // 相机断开连接后的回调函数
        }
        @Override
        public void onError(@NonNull CameraDevice camera, int error) {
            // 相机出错后的回调函数
        }
    }, null);
} catch (CameraAccessException e) {
    e.printStackTrace();
}