smooth = light spot edge smoothed
smooth_1_cm = track of centroid on backgroud of smoothed light spot
smooth_1_head = track of head on backgroud of smoothed light spot
discontinued lines result from bad frames
smooth = light spot edge smoothed
smooth_1_cm = track of centroid on backgroud of smoothed light spot
smooth_1_head = track of head on backgroud of smoothed light spot
discontinued lines result from bad frames
