Figure 1: Image sequence function and connection points that result in the easiest tracking 1) Connections, 2) Objects in all frames, 3) Objects in a frame, 4) X- and Y-coordinates on the vertical axis and time on the horizontal axis Point A: The needle makes contact with the model; designated as time (a).Point B: Needle movement; the welded part of the needle and the needle hub.Point C: Hand movement; the metatarsophalangeal joint of the first or second finger. Time (b): Cessation of needle movement.