An in-vivo sensing device may include, for example, an in-vivo sensing module attached to a functional module. Each tag includes a visible, graphical display adapted to be worn by a user. In accordance with an exemplary embodiment of the invention, a system is proposed, wherein the system is adapted to perform the steps of a method of identifying modifications of an elongated element located in an object of interest. The engine control section is configured to control the engine by using an intake air quantity function between a first value obtained by dividing the reference intake air quantity by the maximum intake air quantity and a second value obtained by dividing an actual intake air quantity corresponding to the valve characteristics of the intake valve by the maximum intake air quantity. The change in direction is determined by utilizing a plurality of adjacent frames located near the first frame and the second frame.