1. A method for providing measurement data of a region of interest in an image in a graphical user interface (GUI) environment, the method comprising: locating a pair of edge points, along first and second directions, based on an initial center position of the region of interest selected by a user in a pixel field presented in the GUI; calculating an updated center position of the region of interest based on located edge mints along the first and second directions; repeating locating updated edge points and calculating an updated center position, based on a previously calculated center position and previously located edge points respectively, until a convergence or divergence is determined based at least in part on differences between consecutively calculated center positions; computing the measurement data based on a final center position relative to edge points associated with the final center position in an event convergence is determined; and reporting the measurement data in the event convergence is detected or reporting a failure state in an event divergence is detected.