c++ - Kalman filter inside a struct and cannot initialize it -

i want track multiple objects using kalman filter. so, doing is, using struct define object's properties , kalman filter track points. (as follows)

struct sasparagus     {         int iid;         int iframeid;         int iwidth;         int iheight;         int ix;         int iy;         int iz;         cv::kalmanfilter kf; // here defining kalman filter , cannot initialize.     }; 

then in loop, trying assign values these properties.

   (cvblobs::const_iterator = blobs.begin(); !=blobs.end();++it)     {         sasparagus sasp;         sasp.iframeid = icounter;          sasp.iwidth = (it->second->maxx - it->second->minx);         sasp.iheight = (it->second->maxy - it->second->miny);         sasp.ix = it->second->centroid.x;         sasp.iy = it->second->centroid.y;         sasp.kf(4, 2, 0);   //here getting error         vaspelements.push_back(sasp);     } 

when run, error follows.

  no match call ‘(cv::kalmanfilter) (int, int, int)’ sasp.kf(4, 2, 0); 

how can initialize kalman filter here ? approach right ? came see here (opencv kalman filter initialization error) approach multiple objects tracking using kalman filter. going wrong ?

sasp.kf(4, 2, 0); cannot used kf default constructed when sasparagus sasp;. cannot call constructor on constructed object. can assign kf temporary kalmanfilter though like:

sasp.kf = cv::kalmanfilter(4, 2, 0); 

or use init() like

sasp.kf.init(4, 2, 0);