如何在(JavaCameraView) CameraBridgeViewBase中设置自定义亮度调整？

Question

我想在使用OpenCV摄像头的应用程序中实现亮度调整。我已经找到了一些方法，并且我已经在JavaCameraView和CameraViewBridge Base的文档中找到了一些可以直接做到这一点的方法，但我还没有找到。

有没有办法做到这一点？

Answer 1

按照这些帮助您调整相机曝光的步骤，首先创建一个CustomCameraView java类

public class CustomCameraView extends JavaCameraView implements Camera.PictureCallback {
private String mPictureFileName;

public CustomCameraView(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public List<String> getEffectList() {
    return mCamera.getParameters().getSupportedFlashModes();
}

public boolean isEffectSupported() {
    return (mCamera.getParameters().getFlashMode() != null);
}

public String getEffect() {
    return mCamera.getParameters().getFlashMode();
}

public void setEffect(String effect) {
    mCamera.getParameters();
    Camera.Parameters params = mCamera.getParameters();
    params.setFlashMode(effect);
    mCamera.setParameters(params);
}

// set Camera Exposure value from input progress (0.0f - 1.0f)
public void setExposure(float progress) {
    if (progress < 0.0f && progress > 1.0f) return;
    Camera.Parameters params = mCamera.getParameters();
    int min = params.getMinExposureCompensation();
    int max = params.getMaxExposureCompensation();
    float realProgress = progress - 0.5f;
    int value;
    if (realProgress < 0) {
        value = -(int) (realProgress * 2 * min);
    } else {
        value = (int) (realProgress * 2 * max);
    }
    // if changed
    if (value != params.getExposureCompensation()) {
        params.setExposureCompensation(value);
        mCamera.setParameters(params);
    }
}

public void setPreviewFPS(double min, double max) {
    Camera.Parameters params = mCamera.getParameters();
    params.setPreviewFpsRange((int) (min * 1000), (int) (max * 1000));
    mCamera.setParameters(params);
}

public List<Camera.Size> getResolutionList() {
    return mCamera.getParameters().getSupportedPreviewSizes();
}

public void setResolution(int w, int h) {
    disconnectCamera();
    mMaxHeight = h;
    mMaxWidth = w;
    connectCamera(getWidth(), getHeight());
}

public Camera.Size getResolution() {
    return mCamera.getParameters().getPreviewSize();
}

public void takePicture(final String fileName) {
    this.mPictureFileName = fileName;
    // Postview and jpeg are sent in the same buffers if the queue is not empty when performing a capture.
    // Clear up buffers to avoid mCamera.takePicture to be stuck because of a memory issue
    mCamera.setPreviewCallback(null);

    // PictureCallback is implemented by the current class
    mCamera.takePicture(null, null, this);
}

@Override
public void onPictureTaken(byte[] data, Camera camera) {
    // The camera preview was automatically stopped. Start it again.
    mCamera.startPreview();
    mCamera.setPreviewCallback(this);

    // Write the image in a file (in jpeg format)
    try {
        FileOutputStream fos = new FileOutputStream(mPictureFileName);
        fos.write(data);
        fos.close();
    } catch (java.io.IOException e) {
        Log.e("PictureDemo", "Exception in photoCallback", e);
    }

}

public void cameraRelease() {
    if (mCamera != null) {
        mCamera.release();
    }
}
}

在此之后，在您声明JavaCameraView的活动的布局文件中，将其更改为

<your.package.CustomCameraView
    android:id="@+id/cameraViewer"
    android:layout_width="380dp"
    android:layout_height="450dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:layout_marginEnd="8dp"
    android:layout_marginBottom="8dp"
    android:visibility="gone"
    opencv:show_fps="false" />

注意:使用适当的包名更改your.package

最后，在活动中添加以下内容

cameraBridgeViewBase = (CustomCameraView) findViewById(R.id.cameraViewer);
cameraBridgeViewBase.setExposure(1.0f);

注:将此值1.0f更改为所需的值。

我希望这对你有帮助。