Question

我正在编写代码以在camerapreview中从drawable中找到类似的对象。我使用的是最新的Opencv 2.4.4。

下面是我的函数和logcat的输出。我得到这样的输出我做错了什么？

 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的：

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

只是为了结束这个问题：

根据您的评论，以下行导致了问题：

dm.match(object_desc, scene_desc, matches);

我建议你手动验证：

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

问题最终是第一帧object_desc.cols() != scene_desc.cols()。一个简单的if足以解决问题。

Answer 2

（打开Cv Mat没有类型方法）尝试此方法..

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);
    }

}

Matcher Assertions失败错误opencv Android

2 个答案: