将opencv视频设置为全屏android [英] setting opencv video to fullscreen android

问题描述

我正在尝试使用opencv将视频设置为全屏显示.输入来自相机.它显示在中间的屏幕上，但不是全屏显示.相关代码:

i am trying to set a video to fullscreen using opencv. the input is coming from the camera. it shows on the screen in the center but not as full screen. relevant code:

public class Sample3Native extends Activity implements CvCameraViewListener {
private static final String TAG = "OCVSample::Activity";

private Mat                    mRgba;
private Mat                    mGrayMat;
private Mat                    mFinalMat;

private CameraBridgeViewBase   mOpenCvCameraView;


private BaseLoaderCallback     mLoaderCallback = new BaseLoaderCallback(this) {
    @Override
    public void onManagerConnected(int status) {
        switch (status) {
            case LoaderCallbackInterface.SUCCESS:
            {
                Log.i(TAG, "OpenCV loaded successfully");

                // Load native library after(!) OpenCV initialization
                System.loadLibrary("native_sample");




                mOpenCvCameraView.enableView();



            } break;
            default:
            {
                super.onManagerConnected(status);
            } break;
        }
    }
};

public Sample3Native() {
    Log.i(TAG, "Instantiated new " + this.getClass());
}

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    Log.i(TAG, "called onCreate");
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

    setContentView(R.layout.tutorial3_surface_view);

    mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.tutorial4_activity_surface_view);
    mOpenCvCameraView.setCvCameraViewListener(this);


}

我尝试使用:

//mOpenCvCameraView.setScaleX(0.8f);
                   // mOpenCvCameraView.setScaleY(0.4f);

                //mOpenCvCameraView.setMinimumHeight(800);
               // mOpenCvCameraView.setMinimumWidth(1000);

但是它不起作用.

我如何伸展框架以填满整个屏幕?

how can i strech the frames to fill all of the screen?

推荐答案

您可以获取可用分辨率的列表或手动进行设置.

You can get a list of the available resolutions or setup manually.

如果要获取可用尺寸的列表并获得最佳的相机尺寸.

If you want to get the list of the available sizes and get the optimal camera size.

   if (mOpenCvCameraView != null) {
        List<Size> sizes = mOpenCvCameraView.getSupportedPreviewSizes();
        int mFrameWidth = width;
        int mFrameHeight = height;

        // selecting optimal camera size
        {

            double minDiff = Double.MAX_VALUE;
            for (Size size : sizes) {
                if (Math.abs(size.height - height) < minDiff) {
                    mFrameWidth = (int) size.width;
                    mFrameHeight = (int) size.height;
                    minDiff = Math.abs(size.height - height);
                }
            }
        }

        mOpenCvCameraView.set(Highgui.CV_CAP_PROP_FRAME_WIDTH, mFrameWidth);
        mOpenCvCameraView.set(Highgui.CV_CAP_PROP_FRAME_HEIGHT, mFrameHeight);
    }

如果最佳的相机尺寸不是全屏显示，则很容易从列表中获得相机支持的最大尺寸.

If the optimal camera size is not fullscreen, it is easy to get the great size that the camera support from the list.

其他选项是手动设置尺寸:

Other option is to set manually the size:

        mOpenCvCameraView.set(Highgui.CV_CAP_PROP_FRAME_WIDTH, 1000);
        mOpenCvCameraView.set(Highgui.CV_CAP_PROP_FRAME_HEIGHT, 800);

代码源于人脸检测OpenCV 2.4.2版.

The source of the code is from Face Detection OpenCV version 2.4.2.

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