Matcher Assertions fehlgeschlagen Fehler opencv Android

Question

Ich schreibe Code, um ähnliche Objekte aus Drawable in Kamerapreview zu finden. Ich benutze das neueste Opencv 2.4.4.

Unten sind meine Funktionen und eine Ausgabe von logcat. Was mache ich falsch, dass ich eine solche Ausgabe bekomme?

public void detect_image (Mat mRgba) { 

    object_desc = new Mat(); 
    scene_desc = new Mat(); 

    object_keys = new MatOfKeyPoint(); 
    scene_keys = new MatOfKeyPoint(); 

    matches = new MatOfDMatch(); 
    good_matches = new MatOfDMatch(); 

    Bitmap image = BitmapFactory.decodeResource(getResources(), R.drawable.sto); 
    Utils.bitmapToMat(image,object); 

    surf = FeatureDetector.create(FeatureDetector.FAST); 
    surf.detect(object, object_keys); 
    surf.detect(mRgba, scene_keys); 
    surfEX = DescriptorExtractor.create(DescriptorExtractor.BRIEF); 
    surfEX.compute(object, object_keys, object_desc);  
    surfEX.compute(mRgba, scene_keys, scene_desc); 
    dm = DescriptorMatcher.create(DescriptorMatcher.BRUTEFORCE_SL2);  
    dm.match(object_desc, scene_desc, matches); 

    double max_dist = 0; 
    double min_dist = 100; 

    for(int i = 0; i < object_desc.rows(); i++) 
     { double dist = matches.toArray()[i].distance; 
     if(dist < min_dist) min_dist = dist; 
     if(dist > max_dist) max_dist = dist; 
     } 

    for(int i = 0; i < object_desc.rows(); i++) 
     { MatOfDMatch temp = new MatOfDMatch(); 
     if(matches.toArray()[i].distance < 3*min_dist) 
     { temp.fromArray(matches.toArray()[i]); 
      good_matches.push_back(temp); 
      }   
     } 

} 



public Mat onCameraFrame(CvCameraViewFrame inputFrame) {   
    mRgba = inputFrame.rgba(); 
      detect_image(mRgba); 
    return inputFrame.rgba(); 
} 

Logcat:

03-27 01:55:31.258: E/cv::error()(564): OpenCV Error: Assertion failed 
(type == src2.type() && src1.cols == src2.cols && 
(type == CV_32F || type == CV_8U)) in void cv::batchDistance(cv::InputArray, 
cv::InputArray, cv::OutputArray, int, cv::OutputArray, int, int, cv::InputArray, 
int, bool), file /home/reports/ci/slave/50-SDK/opencv/modules/core/src/stat.cpp, 
line 1803 

Answer 1

Nur um diese Frage der Schließung:

nach Ihrem Kommentar, die folgende Zeile wurde das Problem verursacht:

dm.match(object_desc, scene_desc, matches); 

I empfohlen, dass Sie dies manuell überprüfen:

(object_desc.type == scene_desc.type && 
object_desc.cols == object_scene.cols) 

Das Problem war schließlich, dass für den ersten Rahmen, object_desc.cols() != scene_desc.cols(). Ein einfaches if war genug, um das Problem zu lösen.

Answer 2

(Offene Cv Mat doestn't haben Typ-Methode) versuchen, diese Methode ..

public void match(Mat object_desc, Mat scene_desc, MatOfDMatch matches) 
{ 
    if(object_desc.type() == scene_desc.type() && 
      object_desc.cols() == scene_desc.cols()) {    
     match_1(nativeObj, object_desc.nativeObj, scene_desc.nativeObj, matches.nativeObj); 
    } 

}