Camera2basic应用程序,在Android 6.0 LGG3中有非常暗的预览

Question

新API,也许只在LG G3上,似乎有些变化.

我正在使用示例代码.

在我的nexus 4上,代码运行完美,但在LGG3上更新到Android 6.0却没有.有任何想法吗？

我玩设置,但没有运气,这仍然适用于Nexus 4:

mPreviewRequestBuilder.set(CaptureRequest.BLACK_LEVEL_LOCK, false);


mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AWB_LOCK, false);
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AWB_MODE, CaptureRequest.CONTROL_AWB_MODE_AUTO);


mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_LOCK, false);

mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON);
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_ANTIBANDING_MODE, CaptureRequest.CONTROL_AE_ANTIBANDING_MODE_AUTO);
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_EXPOSURE_COMPENSATION, 0);
//mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, Range.create(1000,1000));
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER, 0);


mPreviewRequestBuilder.set(CaptureRequest.CONTROL_MODE, CaptureRequest.CONTROL_MODE_AUTO);
mPreviewRequestBuilder.set(CaptureRequest.COLOR_CORRECTION_MODE, CaptureRequest.CONTROL_MODE_AUTO);


mPreviewRequestBuilder.set(CaptureRequest.CONTROL_CAPTURE_INTENT,
        CaptureRequest.CONTROL_CAPTURE_INTENT_PREVIEW);

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

Answer 1

我找到了适合我的解决方案。解决方案是设置设备支持的 FPS 范围。

mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, getRange());

获取范围的函数：

private Range<Integer> getRange() {
    CameraCharacteristics chars = mCameraManager.getCameraCharacteristics(mCameraId);
    Range<Integer>[] ranges = chars.get(CameraCharacteristics.CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES);

    Range<Integer> result = null;

    for (Range<Integer> range : ranges) {
        int upper = range.getUpper();

        // 10 - min range upper for my needs
        if (upper >= 10) {
            if (result == null || upper < result.getUpper().intValue()) {
                result = range;
            }
        }
    }

    if (result == null) {
        result = ranges[0];
    }

    return result;
}

更新：其他设置（如果有人感兴趣）

mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_LOCK, false);
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_ON);
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AWB_MODE, CameraMetadata.CONTROL_AWB_MODE_AUTO);
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
mPreviewRequestBuilder.set(CaptureRequest.STATISTICS_FACE_DETECT_MODE, CameraMetadata.STATISTICS_FACE_DETECT_MODE_SIMPLE);

Answer 2

Camera2 API 的 FPS 范围似乎使用了与旧版 Camera API 不同的比例。因此，如果您收到支持的预览 fps 范围 (0, 30000)，则应将值设置为除以 1000：

mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, Range.create(0, 30));

尝试一下这是否有帮助，因为它对旧版相机 API 有帮助。