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On one of the forums I was told that trouble can be in the version of OpenCV. They say that these functions appeared just in 2.4.0 version, and I have 2.3.1. Can it be the reason of problem?

#include "opencv2/core/core.hpp"

#include "opencv2/highgui/highgui.hpp"

#include "opencv2/imgproc/imgproc.hpp"

using namespace cv;

int main(int, char* [])

{

// Создание видеопотока с камеры
VideoCapture video(0);
Mat frame, curr, prev, curr64f, prev64f, hann;
int key = 0;

do
{
    video >> frame; // Очередной фрейм
    cvtColor(frame, curr, CV_RGB2GRAY); // Перевод в градации серого

    if(prev.empty())
    {
        prev = curr.clone(); // клонирование изображения
        createHanningWindow(hann, curr.size(), CV_64F); // Создание окна Ханна
    }

    prev.convertTo(prev64f, CV_64F); 
    curr.convertTo(curr64f, CV_64F);

    Point2d shift = phaseCorrelate(prev64f, curr64f, hann); // Фазовая корреляция
    double radius = cv::sqrt(shift.x*shift.x + shift.y*shift.y); // Вычисление радиуса отклонения

    if(radius > 5)
    {
        // вывод на экран окружности и направления смещения
        Point center(curr.cols >> 1, curr.rows >> 1);
        cv::circle(frame, center, (int)radius, cv::Scalar(0, 255, 0), 3, CV_AA);
        cv::line(frame, center, Point(center.x + (int)shift.x, center.y + (int)shift.y), cv::Scalar(0, 255, 0), 3, CV_AA);
    }

    imshow("phase shift", frame);
    key = waitKey(2);

    prev = curr.clone();
} while((char)key != 27); // Esc to exit...

return 0;

}

Hi all. I tried to compile this demo, but something went wrong. Visual Studio said that it couldn't find the identifier "createHanningWindow" and "phaseCorrelate". Help me please, what is the problem.