如何设置Camera2 API中的“控制_AE_曝露_补偿”？

Question

我目前正在开发AndroidCamer2API，而我目前的问题是，我无法设置"CONTROL_AE_EXPOSURE_COMPENSATION“。

我的代码：

-1.0 < exposureAdjustment <1.0

public void setExposure(double exposureAdjustment) {
    Range<Integer> range1 = mCameraCharacteristics.get(CameraCharacteristics.CONTROL_AE_COMPENSATION_RANGE);
    int minExposure = range1.getLower();
    int maxExposure = range1.getUpper();

    float newCalculatedValue = 0;
    if (exposureAdjustment >= 0) {
        newCalculatedValue = (float) (minExposure * exposureAdjustment);
    } else {
        newCalculatedValue = (float) (maxExposure * -1 * exposureAdjustment);
    }

    mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_EXPOSURE_COMPENSATION, (int) newCalculatedValue);
}

不幸的是它不起作用了。

Answer 1

我找到了一个对我有用的解决方案。其中exposureAdjustment参数介于-1到+1之间。

public void setExposure(double exposureAdjustment) {
    Range<Integer> range1 = mCameraCharacteristics.get(CameraCharacteristics.CONTROL_AE_COMPENSATION_RANGE);

    int minExposure = range1.getLower();
    int maxExposure = range1.getUpper();

    if (minExposure != 0 || maxExposure != 0) {
        float newCalculatedValue = 0;
        if (exposureAdjustment >= 0) {
            newCalculatedValue = (float) (minExposure * exposureAdjustment);
        } else {
            newCalculatedValue = (float) (maxExposure * -1 * exposureAdjustment);
        }

        if (mPreviewRequestBuilder != null) {
            try {
                CaptureRequest captureRequest = mPreviewRequestBuilder.build();
                mCaptureSession.setRepeatingRequest(captureRequest, camera2FocusMeteringManager.mCaptureCallbackListener, mBackgroundHandler);
                mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_EXPOSURE_COMPENSATION, (int) newCalculatedValue);
                mCaptureSession.capture(captureRequest, camera2FocusMeteringManager.mCaptureCallbackListener, mBackgroundHandler);
            } catch (CameraAccessException e) {
            }
        }
    }
}

在这里，我通过我的mPreviewRequestBuilder (捕获请求的构建器)为每次曝光调整构建一个新的mPreviewRequestBuilder。

这里，您可以找到一个完整的Camera2示例。