如何解决OpenCV绘图轮廓误差

Question

基本上，我试图用一种颜色画出第一个轮廓。但此程序崩溃，出现以下错误：

09-11 09:56:38.390:D/DalvikVM(1920):GC_FOR_ALLOC释放170K，10%释放3702K/4100K，暂停4ms，共4ms

09-11 09:56:38.420:E/CV::error（）（1920）：OpenCV error：cv：：mat cv：：cvarrtomat（const CvArr*,bool,bool,int）中参数错误（数组类型未知），文件/home/reports/ci/slave_desktop/50-sdk/OpenCV/modules/core/src/matrix.cpp,第698行

09-11 09:56:38.430:A/libc(1920):致命信号11(SIGSEGV)在0x00000000(CODE=1)，线程1920(pencvratstudy01)

程序是

@Override
protected void onCreate(Bundle savedInstanceState) {
     
    Log.i(TAG, "called onCreate");
     super.onCreate( savedInstanceState );
     
     if (!OpenCVLoader.initDebug()) {
         // Handle initialization error
     }
     setContentView(R.layout.activity_main);

   
     // load an image from Resource directory
     Mat mMat = new Mat();
     try {
        mMat = Utils.loadResource(this, R.drawable.baby,
                                                 Highgui.CV_LOAD_IMAGE_COLOR);
        } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
  
     // Create result object with correct color
     Mat result = new Mat(); 
     Imgproc.cvtColor(mMat, result, Imgproc.COLOR_RGB2BGRA);
     
     
     // create tmpMat object for gray image and blur it
     Mat tmpMat = new Mat();
     Imgproc.cvtColor(result,tmpMat , Imgproc.COLOR_BGR2GRAY);
     Imgproc.blur(tmpMat, tmpMat, new Size(3,3));
     
     
     /* find cany of tmpMat */
     Mat canny = new Mat();
     Imgproc.Canny( tmpMat, canny , 2 , 4);
     
     // find contours
     Mat hierarchy = new Mat();
     List<MatOfPoint> contours = new ArrayList<MatOfPoint>();
     Imgproc.findContours(canny, contours, hierarchy, Imgproc.RETR_EXTERNAL, 
                                                    Imgproc.CHAIN_APPROX_SIMPLE);

     // draw contour on mask object   
     Mat mask = new Mat();
     Imgproc.drawContours(mask, contours, 0 , new Scalar(255));
    
     
     // create bitmap and draw on imageView
     Bitmap bmp;
     bmp = Bitmap.createBitmap(mask.cols(), mask.rows(), Bitmap.Config.ARGB_8888);
     Utils.matToBitmap(mask, bmp);
     
     ImageView imgView = (ImageView) findViewById(R.id.sampleImageView);
     imgView.setImageBitmap(bmp);
   
     
}

这里有什么问题？

Answer 1

问题是您给DrawControlours方法提供了错误的mat类型，您可以使用

Mat mask = Mat.zeros(result.rows(),result.cols(),result.type());

另一个建议是使用静态块在onCreate之前加载opencv：

static {
    if (!OpenCVLoader.initDebug()) {
        // Handle initialization error
    }
}