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opencv - opencv4android的相机焦点

问题描述

我想模糊图像，所以我需要更改 OpenCV 的对焦模式。我创建了一个新类来继承 javacameraview 并在类中设置焦点模式。现在只需将 mopencvcameraview 参数更改为 crash。我找不到原因。请看一下，谢谢。另一个问题是如何更改 javacamera2view 中的相机参数？

MyJavaCameraView

public class MyJavaCameraView extends JavaCameraView {

    public MyJavaCameraView(Context context, int cameraId) {
        super(context, cameraId);
    }

    public MyJavaCameraView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
I want to blur the image, so I need to change the focus mode of OpenCV. I created a new class to inherit javacameraview and set the focus mode in the class. Now just change the mopencvcameraview parameter to crash. I can't find the reason. Please take a look, thank you. Another question is how to change camera parameters in javacamera2view?

    public void setFocusMode() {
        Camera camera = mCamera;
        Camera.Parameters mParameters = camera.getParameters();
        if (camera != null) {
            List<String> supportedFocusModes = mParameters.getSupportedFocusModes();
            if (supportedFocusModes != null && supportedFocusModes.contains(Camera.Parameters.FOCUS_MODE_INFINITY)) {
                mParameters.setFocusMode(Camera.Parameters.FOCUS_MODE_INFINITY);
                camera.setParameters(mParameters);
            }

        }

    }
}

ImageManipulationsActivity

    @Override
    public void onCreate(Bundle savedInstanceState) {
        Log.i(TAG, "called onCreate");
        super.onCreate(savedInstanceState);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

        setContentView(R.layout.image_manipulations_surface_view);

        mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.image_manipulations_activity_surface_view);
        //Change it to the following crash
        //mOpenCvCameraView = (MyJavaCameraView) findViewById(R.id.image_manipulations_activity_surface_view);
        mOpenCvCameraView.setVisibility(CameraBridgeViewBase.VISIBLE);
        mOpenCvCameraView.setCvCameraViewListener(this);
    }

标签： opencvopencv4android

解决方案

我认为您可能会发现使用相机正常拍摄图像然后使用openCV进行模糊处理会更容易。

这也将使您不必在不同设备上测试和适应不同的相机功能。

这里有一些关于图像模糊的优秀 OpenCV 文档：https ://docs.opencv.org/master/d4/d13/tutorial_py_filtering.html

对于大多数 OpenCV 文档，我发现了解 Python 示例中的方法然后将其应用于 Android 对我们来说通常是件好事，请参阅 Android Python 类文档。

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