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. Author manuscript; available in PMC: 2023 Oct 19.
Published in final edited form as: Proc IEEE Inst Electr Electron Eng. 2023 May 23;111(10):1236–1286. doi: 10.1109/JPROC.2023.3273517

Fig. 14.

Fig. 14.

Three challenges in FER. Images in (a) and (b) are obtained from the AffectNet dataset [78], and images in (c) are obtained from the CK+ dataset [76]. (a) Annotation. (b) Robustness. (c) Subtlety.