关于 c :opencv undistortPoints 返回 NaN ios

    //newKeyPoints is std::vector<cv::KeyPoint>, and it’s values are valid
    cv::Mat src = cv::Mat(1,newKeyPoints.size(),CV_32FC2);
    int i = 0;
    for (std::vector<cv::KeyPoint>::iterator it = newKeyPoints.begin(); it != newKeyPoints.end(); it++){
        src.at<cv::Vec2f>(0,i)[0] = (*it).pt.x;
        src.at<cv::Vec2f>(0,i)[1] = (*it).pt.y;
        i++;
    }

    cv::Mat norm = cv::Mat(1,newKeyPoints.size(),CV_32FC2);

    //Note: fx, fy, cx, cy… k3 are all global constants declared when initialized
    cv::Mat cameraMatrix = cv::Mat(3, 3, CV_32F);
    cameraMatrix.at<double>(0,0) = fx; //double fx = 354.65
    cameraMatrix.at<double>(1,0) = 0;
    cameraMatrix.at<double>(2,0) = 0;
    cameraMatrix.at<double>(0,1) = 0;
    cameraMatrix.at<double>(1,1) = fy; //double fy = 355.66
    cameraMatrix.at<double>(2,1) = 0;
    cameraMatrix.at<double>(0,2) = cx; //double cx = 143.2
    cameraMatrix.at<double>(1,2) = cy; //double cy = 173.6
    cameraMatrix.at<double>(2,2) = 1;

    cv::Mat distCo = cv::Mat(1, 5, CV_32F);
    distCo.at<double>(0,0) = k1; //double k1 = .005
    distCo.at<double>(0,1) = k2; //double k2 = .002
    distCo.at<double>(0,2) = p1; //double p1 = -.009
    distCo.at<double>(0,3) = p2; //double p2 = -.008
    distCo.at<double>(0,4) = k3; //double k3 = -.03

    cv::undistortPoints(src, norm, cameraMatrix, distCo);

    for (int p = 0; p<newKeyPoints.size(); p++){
       printf("%f, %f /
",norm.at<Vec2f>(0,p)[0], norm.at<Vec2f>(0,p)[1]);
    }

cv::Mat your_matrix(rows,cols,CV_64FC1);