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. 2021 Mar 12;21(6):2003. doi: 10.3390/s21062003

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

Visual comparison of different facial expressions (using methods with and without attention module). From top to bottom, the expression pictures, the visual results of the method without the attention module, and the visual results of the method with the attention module; From left to right, there are seven expressions (anger, disgust, fear, happy, neutral, sad, and surprised). We note that, the CK+ images (please see the seven even columns in this figure) are from the following seven subjects: s055, s052, s132, s124, s106, s113, and s074, the usage of their images has been approved. Copyright reference: http://www.jeffcohn.net/Resources/ (accessed on 9 March 2021).