Wie zeichne Rechteck um Konturen in Opencv (Android)?

Question

Ich möchte Rechteck um Konturen zeichnen. Ich habe es in Python perfekt gemacht, aber wenn ich diesen Code in Android übersetze, stürzt die Anwendung jedes Mal ab.

ImageView im = (ImageView) findViewById(R.id.sampleImageView); 
// Bitmap bitmap = ((BitmapDrawable) im.getDrawable()).getBitmap(); 
Bitmap bitmap = BitmapFactory.decodeResource(getApplicationContext().getResources(), R.drawable.room); 

Mat src = new Mat(); 
Utils.bitmapToMat(bitmap, src); 
Mat gray = new Mat(); 
Imgproc.cvtColor(src, gray, Imgproc.COLOR_RGBA2GRAY); 
Imgproc.Canny(gray, gray, 50, 200); 
Imgproc.threshold(gray, gray, 10, 255, Imgproc.THRESH_OTSU); 

List<MatOfPoint> contours = new ArrayList<>(); 
Mat hierarchy = new Mat(); 
Imgproc.findContours(gray, contours, hierarchy, Imgproc.RETR_TREE, Imgproc.CHAIN_APPROX_SIMPLE, new Point(0, 0)); 
Imgproc.drawContours(src, contours, -1, new Scalar(0, 0, 255), -1); 

/********************************/ 
MatOfPoint2f approxCurve = new MatOfPoint2f(); 

// For each contour found 
for (int i = 0; i < contours.size(); i++) 
{ 
    //Convert contours(i) from MatOfPoint to MatOfPoint2f 
    MatOfPoint2f contour2f = new MatOfPoint2f(contours.get(i).toArray()); 
    //Processing on mMOP2f1 which is in type MatOfPoint2f 
    double approxDistance = Imgproc.arcLength(contour2f, true) * 0.02; 
    Imgproc.approxPolyDP(contour2f, approxCurve, approxDistance, true); 

    // Convert back to MatOfPoint 
    MatOfPoint points = new MatOfPoint(approxCurve.toArray()); 

    // Get bounding rect of contour 
    Rect rect = Imgproc.boundingRect(points); 

    // draw enclosing rectangle (all same color, but you could use variable i to make them unique) 
    Imgproc.rectangle(src, new Point(rect.x,rect.y), new Point(rect.x+rect.width,rect.y+rect.height), new Scalar(255,0,255), 3); 
} 


/*******************************/ 
Utils.matToBitmap(src, bitmap); 
im.setImageBitmap(bitmap); 

Fehler

No implementation found for void org.opencv.imgproc.Imgproc.rectangle_1(long, double, double, double, double, double, double, double, double, int) (tried Java_org_opencv_imgproc_Imgproc_rectangle_11 and Java_org_opencv_imgproc_Imgproc_rectangle_11__JDDDDDDDDI) 
04-27 11:38:30.655 12221-12221/com.objectdetection.mrawan.objectdetection D/AndroidRuntime: Shutting down VM 
04-27 11:38:30.665 12221-12221/com.objectdetection.mrawan.objectdetection E/AndroidRuntime: FATAL EXCEPTION: main 
04-27 11:38:30.665 12221-12221/com.objectdetection.mrawan.objectdetection E/AndroidRuntime: Process: com.objectdetection.mrawan.objectdetection, PID: 12221 
04-27 11:38:30.665 12221-12221/com.objectdetection.mrawan.objectdetection E/AndroidRuntime: java.lang.IllegalStateException: Could not execute method of the activity 
04-27 11:38:30.665 12221-12221/com.objectdetection.mrawan.objectdetection E/AndroidRuntime:  at android.view.View$1.onClick(View.java:4096) 
04-27 11:38:30.665 12221-12221/com.objectdetection.mrawan.objectdetection E/AndroidRuntime:  at android.view.View.performClick(View.java:4856) 
04-27 11:38:30.665 12221-12221/com.objectdetection.mrawan.objectdetection E/AndroidRuntime:  at android.view.View$PerformClick.run(View.java:19956) 
04-27 11:38:30.665 12221-12221/com.objectdetection.mrawan.objectdetection E/AndroidRuntime:  at android.os.Handler.handleCallback(Handler.java:739) 
04-27 11:38:30.665 12221-12221/com.objectdetection.mrawan.objectdetection E/AndroidRuntime:  at android.os.Handler.dispatchMessage(Handler.java:95) 
04-27 11:38:30.665 12221-12221/com.objectdetection.mrawan.objectdetection E/AndroidRuntime:  at android.os.Looper.loop(Looper.java:211) 
04-27 11:38:30.665 12221-12221/com.objectdetection.mrawan.objectdetection E/AndroidRuntime:  at android.app.ActivityThread.main(ActivityThread.java:5371) 
04-27 11:38:30.665 12221-12221/com.objectdetection.mrawan.objectdetection E/AndroidRuntime:  at java.lang.reflect.Method.invoke(Native Method) 
04-27 11:38:30.665 12221-12221/com.objectdetection.mrawan.objectdetection E/AndroidRuntime:  at java.lang.reflect.Method.invoke(Method.java:372) 
04-27 11:38:30.665 12221-12221/com.objectdetection.mrawan.objectdetection E/AndroidRuntime:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:945) 
04-27 11:38:30.665 12221-12221/com.objectdetection.mrawan.objectdetection E/AndroidRuntime:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:740) 

Answer 1

@Override 
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) { 
    mRgba = inputFrame.rgba(); 
    contours = new ArrayList<MatOfPoint>(); 
    hierarchy = new Mat(); 
    Imgproc.GaussianBlur(mRgba,mIntermediateMat,new Size(9,9),2,2); 
    Imgproc.Canny(mRgba, mIntermediateMat, 80, 100); 
    Imgproc.findContours(mIntermediateMat, contours, hierarchy, Imgproc.RETR_TREE, Imgproc.CHAIN_APPROX_SIMPLE, new Point(0, 0)); 
/* Mat drawing = Mat.zeros(mIntermediateMat.size(), CvType.CV_8UC3); 
for(int i = 0; i< contours.size(); i++) 
{ 
Scalar color =new Scalar(Math.random()*255, Math.random()*255, Math.random()*255); 
Imgproc.drawContours(drawing, contours, i, color, 2, 8, hierarchy, 0, new Point()); 
}*/ 
    hierarchy.release(); 
      // Imgproc.cvtColor(mIntermediateMat, mRgba, Imgproc.COLOR_GRAY2RGBA, 4) 
/* Mat drawing = Mat.zeros(mIntermediateMat.size(), CvType.CV_8UC3); 
for(int i = 0; i< contours.size(); i++) 
{ 
Scalar color =new Scalar(Math.random()*255, Math.random()*255, Math.random()*255); 
Imgproc.drawContours(drawing, contours, i, color, 2, 8, hierarchy, 0, new Point()); 
}*/ 
    for (int contourIdx=0; contourIdx < contours.size(); contourIdx++) 
    { 
     // Minimum size allowed for consideration 
     MatOfPoint2f approxCurve = new MatOfPoint2f(); 
     MatOfPoint2f contour2f = new MatOfPoint2f(contours.get(contourIdx).toArray()); 
     //Processing on mMOP2f1 which is in type MatOfPoint2f 
     double approxDistance = Imgproc.arcLength(contour2f, true)*0.02; 
     Imgproc.approxPolyDP(contour2f, approxCurve, approxDistance, true); 

     //Convert back to MatOfPoint 
     MatOfPoint points = new MatOfPoint(approxCurve.toArray()); 

     // Get bounding rect of contour 
     Rect rect = Imgproc.boundingRect(points); 

      Core.rectangle(mRgba, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height), new Scalar(255, 0, 0, 255), 3); 



    } 
    return mRgba; 
} 

Versuchen Sie dies es perfekt für mich gearbeitet (wenn Fehler, Code entsprechend der opencv Bibliothek Version). core.rectangle wurde wie folgt in Imgproc.rectangle geändert