How to Flip Image in Real Time Video Using Matlab

This idea comes up when i found that my webcam displays my picture flipped. It means when you wave your right hand, webcam display it in the left side, viceversa. Well, it will be a big issue when we want to use image acquired as mouse controller. My first idea is to give simple computation for matlab to understand which is right hand and which is not. But it ends up to what so called as nonproffesional code programming.