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. Author manuscript; available in PMC: 2022 Jun 9.
Published in final edited form as: Multimed Tools Appl. 2019 Jul 23;78(22):31581–31603. doi: 10.1007/s11042-019-07959-6

Fig. 2.

Fig. 2

Proposed four-stage CNN structure (first CNN for eyebrow segmentation, second CNN for eye segmentation, third CNN for mouth segmentation and fourth CNN for recognition of facial expression)