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. 2013 Dec 5;13(12):16682–16713. doi: 10.3390/s131216682

Figure 8.

Figure 8.

3D feature plots of the HL-FER after applying LDA at the first level for the three expression-categories such as lips-based, lips-eyes-based, or lips-eyes-forehead-based expressions (on JAFFE dataset). It can be seen that at the first level, the HL-FER achieved 100% classification rate in expressions categories classification.