Real-time gesture information acquisition. (a) Circuit diagram showing the signal flow in the real-time gesture information acquisition system, from the acquired analog signals to the digital signals. (b) The current-time curve as the index finger bends, with a distinct linear region. The inset indicates the current changes in small bending angles (<30°). (c) Dependence of the acquisition current signals on index finger motion statuses. The insets, labeled I, II, III, IV, and V, show photographs of the five bending statuses. (d, e) Acquired current signals from (d) elbow bending and (e) ankle bending.