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. Author manuscript; available in PMC: 2015 Nov 14.
Published in final edited form as: IEEE Trans Affect Comput. 2011 Apr-Jun;2(2):79–91. doi: 10.1109/T-AFFC.2011.10

Fig. 1.

Fig. 1

Example of strong, subtle, and ambiguous samples of FACS action unit 12. Strong samples typically correspond to the peak, or maximum intensity, and ambiguous frames correspond to AU onset and offset and frames proximal to them. Subtle samples are located between strong and ambiguous ones. Using an iterative algorithm, DCBB selects positive samples such that the detection accuracy is optimized during training.