5. The method of claim 2 , further comprising modifying a classified energy level of a frame by changing the classified energy level of the frame, wherein in the detecting the energy changes, a segment in which the classified energy level of the frame is changed is identified.
5. The method of claim 2 , further comprising modifying a classified energy level of a frame by changing the classified energy level of the frame, wherein in the detecting the energy changes, a segment in which the classified energy level of the frame is changed is identified. 6. The method of claim 5 , wherein the energy change includes a change between energy levels of neighboring frames and a change between an initial energy level of a frame and a changed energy level of the frame.