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calibration between mouse move & pupil move (eye writer)

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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](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

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