# 3D Approaches and Challenges in Facial Expression Recognition Algorithms--A Literature Review
## 8 Results and Challenges for 3D FER
\begin{table}
\begin{tabular}{l|c|c c c c c c|c} \hline \hline
**Author** & **Year** & **Anger** & **Disgust** & **Fear** & **Happiness** & **Sadness** & **Surprise** & **Overall** \\ \hline [PERSON] et al. [67] & 2010 & 81.7 & 73.6 & 63.6 & 86.9 & 64.6 & **94.8** & 77.53 \\ [PERSON] et al. [60] & 2010 & 96.50 & **97.00** & 94.50 & 94.67 & 96.00 & 97.83 & **96.08** \\ [PERSON] and [PERSON] [156] & 2010 & 91.7 & 93.9 & 90.0 & 94.1 & 90.8 & **98.9** & **93.23** \\ [PERSON] et al. [69] & 2010 & 87.17 & 84.45 & 73.47 & **100** & 74.14 & 94.18 & **85.57** \\ [PERSON] et al. [30] & 2010 & 79.20 & 87.60 & 79.20 & 93.3 & 90.8 & **93.37** & **87.25** \\ [PERSON] et al. [70] & 2011 & 81.7 & 73.6 & 63.6 & 86.9 & 64.6 & **94.8** & 77.53 \\ [PERSON] et al. [44] & 2011 & / & / & / & **95** & 91.67 & 90 & **92.22** \\ [PERSON] et al. [61] & 2011 & 76.8 & 78.1 & 73.2 & 91.4 & 75.5 & **94.5** & **81.6** \\ [PERSON] et al. [45] & 2011 & 77.71 & / & / & **89.37** & / & 85.40 & **83.03** \\ [PERSON] et al. [71] & 2011 & / & / & / & / & / & / \\ [PERSON] et al. [52] & 2012 & 93.11 & 92.46 & 91.24 & **95.47** & 92.46 & 94.53 & **93.21** \\ [PERSON] et al. [89] & 2012 & 92.42 & 91.67 & 81.06 & **98.48** & 88.64 & 93.94 & **91.04** \\ [PERSON] et al. [72] & 2012 & 77.92 & 77.17 & 69.25 & **93.17** & 70.67 & 92.67 & 80.14 \\ [PERSON] et al. [73] & 2012 & 86.8 & 95.9 & 89.7 & 97.6 & 85.5 & **98.7** & **92.37** \\ [PERSON] et al. [46] & 2012 & 51.92 & 62.71 & 46.15 & 75.28 & 68.97 & **82.56** & **64.60** \\ [PERSON] et al. [75] & 2013 & 74.1 & 74.9 & 64.6 & 89.8 & 74.5 & **90.9** & **78.13** \\ [PERSON] et al. [55] & 2013 & 59.58 & 63.67 & 51.00 & 84.58 & 59.58 & **90.50** & **68.15** \\ [PERSON] et al. [41] & 2013 & / & / & / & / & / & / & / \\ [PERSON] and [PERSON] [76] & 2014 & 92.71 & 93.46 & 90.09 & 98.00 & 93.12 & **98.67** & **94.34** \\ [PERSON] et al. [77] & 2014 & / & / & / & / & / & / & / \\ [PERSON] and [PERSON] [47] & 2018 & 80 & 95 & 90 & 95 & 90 & **100** & **91.67** \\ [PERSON] et al. [78] & 2014 & / & / & / & / & / & / & / \\ [PERSON] and [PERSON] [79] & 2014 & 76.25 & 80.00 & 68.75 & 83.75 & 80.00 & **91.22** & 80.00 \\ [PERSON] et al. [42] & 2014 & 55.1 & **83.4** & 73.2 & 61.0 & 77.1 & / & 69.96 \\ [PERSON] et al. [48] & 2015 & 78.67 & 90.83 & 73.67 & 93.5 & 83.67 & **94.50** & **85.81** \\ [PERSON] et al. [64] & 2015 & / & / & / & / & / & / & / \\ [PERSON] and [PERSON] [49] & 2015 & 88.24 & 90.60 & 86.56 & 91.34 & 85.32 & **93.81** & **89.31** \\ [PERSON] et al. [56] & 2015 & 82.33 & 82.83 & 72.33 & **100** & 89.00 & 81.83 & **84.72** \\ [PERSON] et al. [81] & 2015 & 85.14 & 83.28 & 81.86 & 80.67 & 80.48 & **98.49** & **84.99** \\ [PERSON] et al. [82] & 2015 & 83.16 & 83.27 & 78.67 & **94.22** & 77.18 & 92.31 & **84.80** \\
**[PERSON] et al. [53]** & **2016** & **91.3** & **95.2** & **86.7** & **100** & **87.5** & **95.7** & **92.73** \\ [PERSON][PERSON] et al. [66] & 2016 & 79.5 & 85.7 & 63.3 & 94.6 & 79.2 & **96.1** & **83.07** \\ [PERSON] et al. [84] & 2017 & 85.58 & 75.31 & 65.12 & 89.5 & 77.2 & **93.5** & **81.04** \\ [PERSON] et al. [86] & 2017 & 86.25 & 90.00 & 86.25 & **97.50** & 79.75 & 90.50 & **88.38** \\ [PERSON] et al. [85] & 2017 & 77 & 79 & 79 & **94.5** & 82 & 93 & **84.03** \\ [PERSON] and [PERSON] [108] & 2017 & / & / & / & / & / & / & / \\ [PERSON] and [PERSON] [43] & 2017 & / & / & / & / & / & / & / \\ [PERSON] and [PERSON] [40] & 2018 & / & / & / & / & / & / & / \\ [PERSON] et al. [54] & 2018 & / & / & / & / & / & / & / \\ [PERSON] et al. [51] & 2018 & / & / & / & / & / & / & / \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Recognition rates (RRs) in the presence of each type of facial expression and the overall average result obtained. For every kind of emotion, the best result is written in bold characters. Only a few studies have dealt with data sets that explicitly incorporate AUs variation. Table 6 summarizes the performance results (recognition rates of the respective FER methods) obtained by the different research groups.