问在Opencv findContours函数检测到的等高线中发现了过多的点

EN

    findContours(Black, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, 
    Point(0, 0));

//1. If nothing has entered the camera frame, skip
    if(contours.size()==0)
    {
        //cout<<"NoContours ";
        continue;
    }

//2. Only save the maximum contour(index) as the result 
    max_index = 0;
    for (size_t i = 1; i < contours.size(); i++)
    {
        //cout << " Num of Points： " << contours[i].size() << endl;
        if(contours[max_index].size() < contours[i].size())
        {
            max_index = int(i);
        }
    }

//3. If the maximum contour's size is smaller than 5, regard it as noise
    //cout << contours[max_index].size() << endl;
    if(contours[max_index].size() < 5)
    {
        continue;
    }

//find a smallest RotatedRect to express the contour(error happen)
    minRect = minAreaRect(Mat(contours[max_index]));
    RotatedRect minEllipse = fitEllipse(contours[max_index]);