System and method which allow a user to interface with a machine/computer using an image capturing device (e.g. camera) instead of conventional physical interfaces e.g. keyboard, mouse. The system allows the user to interface from any physical and non-physical location within the POV of the camera at a distance that is determined by the resolution of the camera. Using images of the hand, the system may detect a change of hand states. If the new state is a known state that represents a hit state, the system would map the change of state to a key hit in a row and column of the keyboard and sends the function associated with that key for execution. In an embodiment, the system determines the row based on the rotation of the wrist and/or position of the hand.