Fig. 3
From: A video based feedback system for control of an active commutator during behavioral physiology
Improvement of signal-to-noise ratio for head position and direction in task-performing mice. a Head position and direction without noise processing show abrupt angular change when there are no positional variation (shaded). Detected position is unstable and bouncing as indicated by an arrow. b These noises are removed by LED manipulation and image smoothing (see Section Image noise minimization for more details). Abrupt changes are not observed in both X and Y positions. Head directions are smoother than before even though they are not processed offline, such as, digital filtering