android camera2API中传感器ISO和曝光时间的控制

我正在尝试添加手动相机控制新的曝光值和ISO值。我使用的是Camera2基本示例。我现在面临的问题是我对安卓系统还不熟悉。我试着看L-Camera，但它在Scala中，这让我更加困惑

我尝试了以下更改，但图像预览没有更新

 private void createCameraPreviewSession() {
    try {
        SurfaceTexture texture = mTextureView.getSurfaceTexture();
        assert texture != null;

        // We configure the size of default buffer to be the size of camera preview we want.
        texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());

        // This is the output Surface we need to start preview.
        Surface surface = new Surface(texture);

        // We set up a CaptureRequest.Builder with the output Surface.
        mPreviewRequestBuilder
                = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
        mPreviewRequestBuilder.addTarget(surface);

        // Here, we create a CameraCaptureSession for camera preview.
        mCameraDevice.createCaptureSession(Arrays.asList(surface, mImageReader.getSurface()),
                new CameraCaptureSession.StateCallback() {

                    @Override
                    public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {
                        // The camera is already closed
                        if (null == mCameraDevice) {
                            return;
                        }

                        // When the session is ready, we start displaying the preview.
                        mCaptureSession = cameraCaptureSession;
                        try {
                            // Auto focus should be continuous for camera preview.
                            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,
                                    CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);

                            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE,
                                    CaptureRequest.CONTROL_AE_MODE_OFF);

                            mPreviewRequestBuilder.set(CaptureRequest.SENSOR_EXPOSURE_TIME,Long.valueOf("100000"));
                            mPreviewRequestBuilder.set(CaptureRequest.SENSOR_SENSITIVITY,1600);

                            // Flash is automatically enabled when necessary.
                            setAutoFlash(mPreviewRequestBuilder);

                            // Finally, we start displaying the camera preview.
                            mPreviewRequest = mPreviewRequestBuilder.build();
                            mCaptureSession.setRepeatingRequest(mPreviewRequest,
                                    mCaptureCallback, mBackgroundHandler);
                        } catch (CameraAccessException e) {
                            e.printStackTrace();
                        }
                    }

                    @Override
                    public void onConfigureFailed(
                            @NonNull CameraCaptureSession cameraCaptureSession) {
                        showToast("Failed");
                    }
                }, null
        );
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}

---

首先，您必须将模板更改为

template\u STILL\u CAPTURE

或

template\u MANUAL

以查看预览中的值更改。另外，请记住将

控制模式和“控制模式”设置为关闭

此控件仅在android.control.aeMode或android.control.mode设置为OFF时有效；否则，自动曝光算法将覆盖此值

从

第二，用以下方法设置您的值：

builder.set(CaptureRequest.SENSOR_SENSITIVITY, isoValue);
builder.set(CaptureRequest.SENSOR_EXPOSURE_TIME, exposureTimeValueInMilliseconds);

最后，在所有更改之后，不要忘记使用CaptureSession.setRepeatingRequest更新预览

希望它能帮助你
 因此，我对代码做了以下更改

mPreviewRequestBuilder
    = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_MANUAL);
mPreviewRequestBuilder.addTarget(surface);


mPreviewRequestBuilder.set(CaptureRequest.CONTROL_MODE,
    CaptureRequest.CONTROL_MODE_OFF);

mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,
    CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);

mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE,
    CaptureRequest.CONTROL_AE_MODE_OFF);

mPreviewRequestBuilder.set(CaptureRequest.SENSOR_EXPOSURE_TIME,Long.valueOf("22000"));
mPreviewRequestBuilder.set(CaptureRequest.SENSOR_SENSITIVITY,200);

mCaptureSession.setRepeatingRequest(mPreviewRequest,
    mCaptureCallback, mBackgroundHandler);

然而，我得到了一个奇怪的预览，有很多绿灯作为输入

给你

这是使用我的内置照相机应用程序时的样子：
这将解决问题：

mPreviewBuilder.set(
    CaptureRequest.CONTROL_AWB_MODE, 
    CaptureRequest.CONTROL_AWB_MODE_AUTO
);

在使用camera 2 API手动曝光时，我也遇到了绿色捕捉的问题。
我可以通过停用
控制模式
而不是
控制模式
和
控制模式
来修复它。
这是我的配置：

final CaptureRequest.Builder captureBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);

captureBuilder.set(CaptureRequest.CONTROL_AE_MODE, CameraCharacteristics.CONTROL_AE_MODE_OFF);
captureBuilder.set(CaptureRequest.CONTROL_MODE, CameraCharacteristics.CONTROL_MODE_AUTO);
captureBuilder.set(CaptureRequest.SENSOR_EXPOSURE_TIME, Long.valueOf("8000000")); // 8000000 ns = 8 ms

设置为自动“控制AWB模式”或禁用它。不，它没有。我想这和帧速率有关。我需要设置吗？有任何地方我可以与你联系我的疑问吗？你在我的个人资料中有我的电子邮件。让我知道我是否能在那里帮助你，我会试试看。我在个人资料中找不到你的电子邮件。我应该在哪里找它！你能帮我解决同样的问题吗。。。我已经花了5天没有成功了。。我需要设置iso，但每一步我都会遇到不同的问题。。。也许，如果你有代码样本，你最终如何解决这个问题，它将帮助不仅是我。因为正如你所知道的，关于camera2api的示例很少，关于如何设置自定义设置的示例也几乎没有……这只是一个让我感到困扰的要点。曝光时间不是以毫秒为单位，而是以纳秒为单位。