预览中的 Nexus 5x 帧已转为 Camera2

Nexus 5x Frames from preview are turned Camera2

我尝试在 Android 中对预览的当前帧进行一些图像处理。 对于其他所有智能手机,它都运行良好。但现在,我必须让 Nexus 5x 可以访问该应用程序。

我从预览中得到了一个 180 度旋转的图像。我该如何解决? 这是我设置相机和预览的代码:

private void resetCamera(int width, int height){
    Log.d(TAG, "Reset Camera!");
    CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
    try {
        for (String cameraId : cameraManager.getCameraIdList()) {
            CameraCharacteristics cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraId);
            mSensorOrientation = cameraCharacteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
            if (cameraCharacteristics.get(CameraCharacteristics.LENS_FACING) == CameraCharacteristics.LENS_FACING_FRONT) {
                continue;
            }
            StreamConfigurationMap map = cameraCharacteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);

            mImageReader = ImageReader.newInstance(width,
                    height,
                    ImageFormat.YUV_420_888,
                    10);
            mImageReader.setOnImageAvailableListener(mOnImageAvailableTrack,
                    mBackgroundHandler);

            mPreviewSize = getPreferredPreviewSize(map.getOutputSizes(SurfaceTexture.class), width, height);
            mCameraId = cameraId;
            return;
        }
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}

预览:

private void createTrackingPreviewSession(){
    try{
        SurfaceTexture surfaceTexture = mTextureView.getSurfaceTexture();
        surfaceTexture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
        Surface previewSurface = new Surface(surfaceTexture);
        mPreviewCaptureBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
        mPreviewCaptureBuilder.addTarget(previewSurface);
        mPreviewCaptureBuilder.addTarget(mImageReader.getSurface());

        int rotation = getWindowManager().getDefaultDisplay().getRotation();
        mPreviewCaptureBuilder.set(CaptureRequest.JPEG_ORIENTATION,
                getOrientation(rotation));

        mCameraDevice.createCaptureSession(Arrays.asList(previewSurface, mImageReader.getSurface()),
                new CameraCaptureSession.StateCallback(){
                    @Override
                    public void onConfigured(CameraCaptureSession session) {
                        if(mCameraDevice == null){
                            return;
                        }
                        try{
                        Toast.makeText(getApplicationContext(), "Create Tracking Session", Toast.LENGTH_SHORT).show();
                            mPreviewCapture = mPreviewCaptureBuilder.build();
                            mCaptureSession = session;
                            mCaptureSession.setRepeatingRequest(
                                    mPreviewCapture,
                                    mSessionCaptureCallback,
                                    mBackgroundHandler
                            );
                        } catch(CameraAccessException e){
                            e.printStackTrace();
                        }
                    }

                    @Override
                    public void onConfigureFailed(CameraCaptureSession session) {
                        Toast.makeText(
                                getApplicationContext(),
                                "create Camera session failed!",
                                Toast.LENGTH_SHORT
                        ).show();
                    }
                }, null);
    } catch(CameraAccessException e){
        e.printStackTrace();
    }
}

如您所见,我尝试使用该修复程序来捕获图像,但它并没有帮助我仍然从预览中获得经过转换的图像。

如果可能的话,我想要一个尝试更改相机设置的解决方案。通过绑定的ImageReader获取Image后不想自己转

在正确理解您的问题后,我会尝试执行以下操作(如果您还没有这样做的话)。我认为你的问题不在于你的previewCaptureSession,而是在于你拍照的代码。

我猜你正确地使用了另一个 CaptureRequest.Builder 和 CameraDevice.TEMPLATE_STILL_CAPTURE 模板。

对于此生成器,您必须设置 JPEG 方向。正如我在评论中所说,一些相机设备有 90° 和其他 270° 旋转。

要设置正确的方向,请执行以下两个代码段。

private static SparseIntArray ORIENTATIONS = new SparseIntArray();
static{
    ORIENTATIONS.append(Surface.ROTATION_0, 0);
    ORIENTATIONS.append(Surface.ROTATION_90, 90);
    ORIENTATIONS.append(Surface.ROTATION_180, 180);
    ORIENTATIONS.append(Surface.ROTATION_270, 270);
}

private int sensorToDeviceRotation(CameraCharacteristics cameraCharacteristics, int deviceOrientation){
    int sensorOrientation = cameraCharacteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
    deviceOrientation = ORIENTATIONS.get(deviceOrientation);
    return (sensorOrientation + deviceOrientation + 360) % 360;
}

或者使用你自己的逻辑/实现。

对于用于捕获图像的 captureRequestBuilder,按如下方式设置 JPEG_ORIENTATION:

int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, sensorToDevice(cameraCharacteristics, rotation));

这就是我在我的应用程序中捕捉图像的方式,我保存的图像被正确旋转了! 如果您是这样做的,我建议您添加代码以实际拍照,而不仅仅是您的预览会话。

希望对您有所帮助!