calibration between mouse move & pupil move (eye writer)

edit

hello i write program for detect face & then detect Right eye & then detect pupil (circle hough) Finally move mouse.

The problem I have is that ‌Move the mouse range is low. the range of motion mouse is 20 x 20 pixels. Mouse cursor moves only in a very small area of the desktop.

I need Mouse cursor moves in all area of the desktop.

This code get the coordinates of the center of the circular Hough and then cursor is moved .

......
......
.....

 void mousemove(int x_pos, int y_pos)
{
    ///Strings that will contain the conversions
    string xcord; string ycord;

    ///These are buffers or something? I don't really know... lol.
    stringstream sstr; stringstream sstr2;

    ///Conversion to regular string happens here
    sstr<<5*x_pos;
    xcord = sstr.str();
    sstr2<<5*y_pos;
    ycord = sstr2.str();

    ///Getting the command string
    string command = "xdotool mousemove " + xcord + " " + ycord;

    ///Converting command string to a form that system() accepts.
    const char *com = command.c_str();
    system(com);
}


int main()
{
    CascadeClassifier face_cascade("/home/elinux/opencv-3.1.0/data/haarcascades_cuda/haarcascade_frontalface_alt2.xml");
    CascadeClassifier eye_cascade("/home/elinux/opencv-3.1.0/data/haarcascades_cuda

/haarcascade_righteye_2splits.xml");
    ....
    ....
    ...
morphologyEx(framepupil, morph_grad, MORPH_GRADIENT,se,Point(-1,-1),1);
HoughCircles(morph_grad,  circles,  HOUGH_GRADIENT, 1,  1000,  100,15, 10,20);
if(circles.size()!=0){
        (circles[t][0])=(circles[t][0])*((circles[t][0])/10);
        (circles[t][1])=(circles[t][1])*((circles[t][1])/10);
        mousemove((circles[t][0]),(circles[t][1]));
        }
....
.....
....

Here are the all codes: https://github.com/Ehsan-Shahnazi/EyeWriter/blob/master/22-22.cpp

How should calibration between eye positions and cursor positions?? Do you have code samples?

(Perhaps the problem of how to track pupil or codes to move the mouse or...???)

thanks