Android OpenCV 无法检测圆圈

Question

目前我正在开发 Android 应用程序来检测相机 View 中的圆圈。我是 OpenCV 的新手，现在我正在尝试检测图像中的圆圈而不是初学者的相机。我写了这段代码:

Bitmap photo = BitmapFactory.decodeResource(getResources(), 
        R.drawable.circle);

Toast.makeText(getBaseContext(), "It works!", Toast.LENGTH_LONG).show();
Mat imgSource = new Mat(), imgCirclesOut = new Mat();

Utils.bitmapToMat(photo , imgSource);

Imgproc.cvtColor(imgSource, imgSource, Imgproc.COLOR_BGR2GRAY);
Imgproc.GaussianBlur( imgSource, imgSource, new Size(9, 9), 2, 2 );
Imgproc.HoughCircles( imgSource, imgCirclesOut, Imgproc.CV_HOUGH_GRADIENT, 1, imgSource.rows()/8, 200, 100, 0, 0 );

float circle[] = new float[3];

for (int i = 0; i < imgCirclesOut.cols(); i++)
{
        imgCirclesOut.get(0, i, circle);
    org.opencv.core.Point center = new org.opencv.core.Point();
    center.x = circle[0];
    center.y = circle[1];
    Core.circle(imgSource, center, (int) circle[2], new Scalar(0,0,255), 5);
    }
    Bitmap bmp = Bitmap.createBitmap(photo.getWidth(), photo.getHeight(), Bitmap.Config.ARGB_8888);

    Utils.matToBitmap(imgSource, bmp);




image.setImageBitmap(bmp);

当我按下一个按钮时，它就起作用了。根据所有问题、教程等，我检查过它应该可以工作并检测到我的圆圈，但它所做的只是将我的图像处理为灰度。这是它在我的应用中的样子:

帮助。

Answer 1

你需要先加载opencv native so's，然后才能执行任何opencv相关代码:

private BaseLoaderCallback  mLoaderCallback = new BaseLoaderCallback(this) {
    @Override
    public void onManagerConnected(int status) {
        switch (status) {
            case LoaderCallbackInterface.SUCCESS:
            {
                Log.i(TAG, "OpenCV loaded successfully");
                // either call your opencv code from **here**
                // or from onCameraViewStarted(). either way, you will have 
                // to wait, until this thing finished (async!)
            } break;
            default:
            {
                super.onManagerConnected(status);
            } break;
        }
    }
};


@Override
public void onResume()
{
    super.onResume();
    OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_3, this, mLoaderCallback);
}