Automated Tracking of Whiskers in Videos of Head Fixed Rodents
Figure 5
When linking N whiskers, each curve in a frame is assigned a label W1 to WN, or F0 to FN.
Rules constrain the labeling to enforce consistent anterior-posterior ordering of whiskers. The most proximal point of curves labeled Wi or Fi must be posterior to that of curves labeled Wj or Fj when i<j, and at most one curve may be labeled Wi for a given i. (A) A correct labeling is schematically illustrated. (B) These rules are encoded as transitions in a hidden Markov model. (C) Normalized feature histograms are used to compute the likelihood a curve is, or is not, a whisker.