奇怪的情況顯示墊在Android opencv

我正在做一個簡單的測試，以顯示在opencv4android中的Mat對象的內容。我發現dump（）方法起作用，它在get（）方法失敗時給了我矩陣的所有條目，我打算從矩陣中獲取單個條目。這兩種方式在主要活動中的onTouchEvent中實現，一個執行正常，另一個則使程序崩潰。我不知道爲什麼。任何想法？奇怪的情況顯示墊在Android opencv

public class puzzle15Activity extends Activity 
{ 
     Mat showMat; 
private static final String TAG = "Sample::Activity"; 
public double[] a; 
     double b; 
     private SampleCvViewBase mView=null; 
     private BaseLoaderCallback mOpenCVCallBack = new BaseLoaderCallback(this) 
{ 
    @Override 
    public void onManagerConnected(int status) { 
     switch (status) { 
      case LoaderCallbackInterface.SUCCESS: 
      { 
       Log.i(TAG, "OpenCV loaded successfully"); 
       //mView = new puzzle15View(mAppContext); 
       mView=new SampleCvViewBase(mAppContext); 
       setContentView(mView); 
       mView.openCamera(); 

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

    } 
}; 


@Override 
public void onCreate(Bundle savedInstanceState) 
{ 
    Log.i(TAG, "onCreate"); 
    super.onCreate(savedInstanceState); 
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_2,this,mOpenCVCallBack); 

} 


@Override 
public boolean onTouchEvent(MotionEvent m) 
{ 
    Toast.makeText(this,mView.mrgba.dump(),Toast.LENGTH_SHORT).show(); 
    a= mView.mrgba.get(1,1); 
       //b=a[1];//here b can't be assigned this way....... 
    //Toast.makeText(this,Double.toString(b),Toast.LENGTH_SHORT).show(); 
    return false; 
} 
} 



class SampleCvViewBase extends SurfaceView implements SurfaceHolder.Callback, Runnable { 
private static final String TAG = "Sample::SurfaceView"; 

private SurfaceHolder  mHolder; 
private VideoCapture  mCamera; 
Mat mrgba; 
public int[] list={1,2,3}; 

public SampleCvViewBase(Context context) { 
    super(context); 
    mrgba=new Mat(4,4,CvType.CV_16S); 
    mHolder = getHolder(); 
    mHolder.addCallback(this); 
} 

public boolean openCamera() { 
    synchronized (this) { 
     releaseCamera(); 
     mCamera = new VideoCapture(Highgui.CV_CAP_ANDROID); 
     if (!mCamera.isOpened()) { 
      mCamera.release(); 
      mCamera = null; 
      return false; 
     } 
    } 
    return true; 
} 

public void releaseCamera() { 
    Log.i(TAG, "releaseCamera"); 
    synchronized (this) { 
     if (mCamera != null) { 
       mCamera.release(); 
       mCamera = null; 
     } 
    } 
} 

public void setupCamera(int width, int height) { 
    Log.i(TAG, "setupCamera("+width+", "+height+")"); 
    synchronized (this) { 
     if (mCamera != null && mCamera.isOpened()) { 
      List<Size> sizes = mCamera.getSupportedPreviewSizes(); 
      int mFrameWidth = width; 
      int mFrameHeight = height; 
      { 
       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); 
        } 
       } 
      } 

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

} 

public void surfaceChanged(SurfaceHolder _holder, int format, int width, int height) { 
    Log.i(TAG, "surfaceChanged"); 
    setupCamera(width, height); 
} 

public void surfaceCreated(SurfaceHolder holder) { 
    Log.i(TAG, "surfaceCreated"); 
    (new Thread(this)).start(); 
} 

public void surfaceDestroyed(SurfaceHolder holder) { 
    Log.i(TAG, "surfaceDestroyed"); 
    releaseCamera(); 
} 

public void run() { 
    Log.i(TAG, "Starting processing thread"); 
    while (true) { 
     Bitmap bmp = null; 

     synchronized (this) { 
      if (mCamera == null) 
       break; 

      if (!mCamera.grab()) { 
       Log.e(TAG, "mCamera.grab() failed"); 
       break; 
      } 

     } 

      } 

    Log.i(TAG, "Finishing processing thread"); 
} 
}

來源

2012-11-19 Yiyangchen

糟糕，我犯了一個錯誤，稱爲從不存在的矩陣組件。最初，矩陣只有一個通道。這解釋了這個麻煩。謝謝。

來源

2012-11-20 01:16:50 Yiyangchen

奇怪的情況顯示墊在Android opencv

回答

相關問題