A sample planar navigation graphical user interface GUI is made by using the checkerboard calibration. The GUI figure and work flowchart is given on the next page. The first part as usual is the initialization code. Then this is followed by the opening function, which initializes a GUI as it is opened in every GUIDE generated GUI code file. The data is stored in the handles structure, an argument provided to all callbacks. These callbacks for the push buttons (three in this GUI) can retrieve data from the handles structure. With the help of friend and colleague Usman Arif. - View it on GitHub