How to find the Euclidean distance between the center of gravity of an object in one frame and an adjacent frame

I'm going to assume that the camera hasn't moved between captures, so you don't have to worry about registration.

You should have two objects cv::Point

representing the two acquired centroids. Euclidean distance can be calculated as follows:

double euclideanDist(Point p, Point q)
{
    Point diff = p - q;
    return cv::sqrt(diff.x*diff.x + diff.y*diff.y);
}

int main(int /*argc*/, char** /*argv*/)
{
    Point centroid1(0.0, 0.0);
    Point centroid2(3.0, 4.0);

    cout << euclideanDist(centroid1, centroid2) << endl;

    return 0;
}

      

        
        
        
      

    

This outputs 5 (i.e. 3-4-5 triangle) ...

Hope it helps!