Hybrid Facial Expression Recognition (FER2013) Model for Real-Time Emotion Classification and Prediction

BOHR International Journal of Internet of Things, Artificial Intelligence and Machine Learning
2022, Vol. 1, No. 1, pp. 63–71
https://doi.org/10.54646/bijiam.011
www.bohrpub.com
Hybrid Facial Expression Recognition (FER2013) Model for
Real-Time Emotion Classification and Prediction
Ozioma Collins Oguine∗, Kanyifeechukwu Jane Oguine, Hashim Ibrahim Bisallah
and Daniel Ofuani
Department of Computer Science, University of Abuja, Abuja, Nigeria
∗Corresponding author: oziomaoguine007@gmail.com
Abstract. Facial expression recognition is a vital research topic in most fields ranging from artificial intelligence
and gaming to human–computer interaction (HCI) and psychology. This paper proposes a hybrid model for
facial expression recognition, which comprises a deep convolutional neural network (DCNN) and a Haar Cascade
deep learning architecture. The objective is to classify real-time and digital facial images into one of the seven
facial emotion categories considered. The DCNN employed in this research has more convolutional layers, ReLU
activation functions, and multiple kernels to enhance filtering depth and facial feature extraction. In addition, a Haar
Cascade model was also mutually used to detect facial features in real-time images and video frames. Grayscale
images from the Kaggle repository (FER-2013) and then exploited graphics processing unit (GPU) computation
to expedite the training and validation process. Pre-processing and data augmentation techniques are applied to
improve training efficiency and classification performance. The experimental results show a significantly improved
classification performance compared to state-of-the-art (SoTA) experiments and research. Also, compared to other
conventional models, this paper validates that the proposed architecture is superior in classification performance
with an improvement of up to 6%, totaling up to 70% accuracy, and with less execution time of 2,098.8 s.
Keywords: Deep learning, DCNN, facial emotion recognition, human–computer interaction, Haar Cascade, com-
puter vision, FER2013.
INTRODUCTION
Humans possess a natural ability to understand facial
expressions. In real life, humans express the emotions on
their faces to show their psychological state and dispo-
sition at a time and during their interactions with other
people. However, the current trend of transferring cogni-
tive intelligence to machines has stirred up conversations
and research in the domain of human–computer interac-
tion (HCI) and computer vision, with a particular interest
in facial emotion recognition and its application in human–
computer collaboration, data-driven animation, human-
robot communication, etc.
Since emotions are physical and instinctive, they imme-
diately cause physical responses to dangers, rewards,
and other environmental elements. The objective measure-
ments used to ascertain how people respond to these fea-
tures include skin conductance (EDA/GSR), voice, body
language, locomotion, brain activity (fMRI), heart rate
(ECG), and facial expressions. A notable ability for humans
to interpret emotions is crucial to effective communication;
hypothetically, 93% of efficient conversation depends on
the emotion of an entity. Hence, for ideal human–computer
interaction (HCI), a high-level understanding of the human
emotion is required by machines.
Emotions are a fundamental part of human commu-
nication, driven by the erratic nature of the human
mind and the perception of relayed information from
the environment. There are varied emotions that inform
decision-making and are vital components in individual
reactions and psychological state. Contemporary psycho-
logical research observed that facial expressions are pre-
dominantly used to understand social interactions rather
than the psychological state or personal emotions. Con-
sequently, the credibility assessment of facial expressions,
which includes the discernment of genuine (natural)
63

64 Ozioma Collins Oguine et al.
Figure 1. FER-2013 sample training set images.
expressions from postured (deliberate/volitional/decep-
tive) expressions, is a crucial yet challenging task in facial
emotion recognition. This research will focus on educat-
ing objective facial parameters from real-time and digital
images to determine the emotional states of people given
their facial expressions, as shown in Figure 1.
Over the last 6 years, advancement in deep learning
has propelled the evolution of convolutional networks.
Computer vision is an interdisciplinary scientific field that
equips the computer with a high-level understanding from
images or videos that replicate human visual prowess
within a computer perspective. Its aims are to automate
tasks, categorize images from a given set of classes, and
have the network determine the predominant class present
in the image. It can be implied that computer vision is
the art of making a computer ‘see’ and impacting it with
human intelligence of processing what is ‘seen’. More
recently, deep learning has become the go-to method for
image recognition and detection, far usurping medieval
computer vision methods due to the unceasing improve-
ment in the state-of-the-art performance of the models.
A gap identified by this research is with regards to the
fact that most datasets of preceding research consist of
well-labeled (posed) images obtained from a controlled
environment, usually postured. According to Montesinos
López et al., this anomaly increased the likelihood of model
overfitting, given insufficient training data availability,
ultimately causing a relatively lesser efficiency in predict-
ing emotions in uncontrolled scenarios [1]. Consequently,
this research also identified the importance of lighting in
facial emotion recognition (FER), highlighting that poor
lighting conditions could decline the model’s efficiency.
This research will use convolutional neural networking
(CNN) to model some critical extracted features used for
facial detection and classify the human psychological state
into one of the six emotions or a seventh neutral emotion.
It will also employ the Haar Cascade model for real-time
facial detection. It is worthy of note that given the hand-
engineered nature of the features and model dependency
on prior knowledge, a resultant comparatively higher
model accuracy is required.
EMPIRICAL REVIEW OF RELATED WORK
Over the years, several scholars have embarked on
research to tackle this novel challenge. Ekman & Friesen
highlighted seven basic human emotions independent
of the culture a human being is born into (anger, fear,
disgust, happiness, sad, surprise, and neutral) [2]. Sajid
et al., a study using the facial recognition technology
(FERET) dataset, recently established the significance of
facial asymmetry as a marker for age estimation. The
study highlighted the simplicity with which the right face’s
asymmetry may be identified relative to the left face [3].
Below are some reviews of works of literature pertinent to
this research.
A model was trained on individual frames from movies
and still digital images using a CNN-RNN mixed archi-
tecture by Kahou et al. [4]. The acted facial expressions
in the wild (AFEW) 5.0 dataset was used for the video
clips, and a combination of the FER-2013 and Toronto
Face Database [5] was used for the photographs. Long
short-term memory (LSTM) units were replaced by IRNNs,
which are composed of rectified linear units (ReLUs) [6].
IRNNs were appropriate because they offered a straight-
forward solution to the vanishing and exploding gradient
problem. The accuracy of the study as a whole was 0.528.
Face detection still has a serious problem with how
faces appear in poses. The explanation for the variation
in face position look was offered by Ratyal et al. Using
subject-specific descriptors, three-dimensional pose invari-
ant approach was used [7, 8].
The inter-variability of emotions between individuals
and misclassification are two issues with still image-based
FERs that Ming Li et al., to address [9], suggest a neural
network model. Their model consists of two convolutional
neural networks; the first is trained on facial expression
databases, while the second is a DeepID network that
learns features relevant to identity. These two neural net-
works were integrated into a tandem facial expression of
TFE feature and delivered to the fully linked layers to pro-
duce a new model. Arousal and valence emotion annota-
tions employing face, body, and context information were
used by Mou et al. to infer group emotion [10]. To identify
group-level emotion in photos, Tan et al. combined two
different forms of CNNs, namely, individual facial emotion
CNNs and global image-based CNNs [11]. Different pool-
ing methods such as average and max pooling are used to
downsample the inputs and aid in generalization [12, 13].
Dropout, regularization, and data augmentation were used
to prevent overfitting. Batch normalization was developed
to help prevent gradient vanishing and exploding [14, 15].
As can be inferred from the literature highlighted
above, several innovative research conducted by other

Hybrid Facial Expression Recognition (FER2013) Model for Real-Time Emotion Classification and Prediction 65
Table 1. Summary of previous reported accuracies for the FER-
2013 dataset.
Methods Accuracy Rating
CNN [16] 62.44%
GoogleNet [19] 65.20%
VGG + SVM [18] 66.31%
Conv + Inception Layer [20] 66.40%
Bag of words [17] 67.40%
CNN + Haar Cascade (This work) 70.04%
scholars has emphasized continuous upscaling of accuracy
without consideration for efficiency simultaneously. This
research paper proposes a more efficient and accurate
model with improved generalization, as discussed in sub-
sequent sections. Table 1 summarizes previous reported
classification accuracies FER2013. Most reported methods
perform better than the estimated human performance
(∼65.5%). In this work, a state-of-the-art accuracy of
70.04% was achieved.
THEORETICAL BACKGROUND
The emotions are divided into groups according to sur-
prise, wrath, happiness, fear, disgust, and neutrality in
order to solve the FER problem [21]. It creates a classifi-
cation algorithm utilizing the features that were extracted.
In the past, researchers have used classifiers for identify-
ing facial expressions, including support vector machine
(SVM), artificial neural network (ANN), hidden Markov
model (HMM), and K-nearest neighbor (KNN). This
research employs a modified hybrid model, which com-
prises two models (CNN and Haar Cascade). Following are
explanations of several model components that constitute
an architecture for learning various degrees of abstraction
and representations. In the output layer for seven emotion
classifications, these elements comprise convolutional lay-
ers, dropout, ReLU activation function, categorical cross-
entropy loss, Adam optimizer, and softmax activation
function, as illustrated in Figure 2. This section will also
emphasize the modifications made to these components
through hyperparameter tuning that enhanced the profi-
ciency and accuracy of the hybrid model.
Convolutional Layer
The central component of a convolutional neural network
that does the majority of the computational work is the
conv layer. The convolution layer applies a filter fk with
a kernel size of n ∗ m to an input x in order to perform
a convolution [21] for a given input. There are n ∗ m
input connections. The following equation can be used to
compute the result.
C(XU,V) =
n/2
∑
i=n/2
n/2
∑
j=−n/2
fk(i, j)x(u−i,v−j) (1)
Max Pooling Layer
By using the max function, it significantly decreases the
input (Saravanan and others) [22]. Let m represent the
filter’s size and xi represent the input. Figure 2 depicts the
application of this layer, and the equation can be used to
determine the result.
M(xi) = max(ri+k,i+l/|k| ≤ m/2, |l| < m/2, k, l ∈ N) (2)
Rectified Linear Unit (ReLU) Activation Function
It determines the output for a specific value of the net-
work’s or a neuron’s input p, as shown in Equation (3).
ReLU was utilized for this research because it has no
exponential function to calculate and has no vanishing gra-
dient error. Figure 2 shows the concatenated convolutional
layers parallelly processed via ReLU activation functions
to upscale accuracy and obtain facial features of images
flawlessly.
f (x) =

0, for x 0
1, for x ≥ 0
(3)
Fully Connected Layer
This is a multilayer perceptron, and it changes every neu-
ron from the previous levels into a neuron in the current
layer. The following equation serves as its mathematical
representation:
f (x) = σ(p ∗ x) (4)
Figure 2. Proposed CNN model structure.

where σ is the activation function, and p is the resultant
matrix of size n ∗ k. k is the dimension of x, and n is the
number of neurons in a fully connected layer.
Output Layer: It represents the class of the given input
image and is one hot vector [21]. It is expressed in the
following equation.
C(x) = (i|∃vj6=i and xj ≤ xi) (5)
SoftMax Layer
Its main functionality is backpropagation of error [21]. Let
the dimension of an input vector be P. Then, it can be
represented as a mapping function as expressed in the
following equation.
S(x): RP
→ [0, 1]P
(6)
and the output for each component j(1 ≤ j ≤ P) is given
as the following equation.
S(x)j =
ex j
∑
p
i=1 exi
(7)
PROPOSED METHODOLOGY
With the need for real-time object detection, several object
detection architectures have gained wide adoption by
most researchers. However, the hybrid architecture put
forward by this research uses both the Haar Cascade
face detection, a popular facial detection algorithm pro-
posed by Paul Viola and Michael Jones in 2001, and the
CNN model together. In Figure 2, the CNN architecture
initially needs to extract input pictures of 48 × 48 × 1
(48 wide, 48 high, 1 color channel) from dataset FER-
2013. The network starts with an input layer equal to the
input data dimension of 48 × 48. It also consists of seven
concatenated convolutional layers parallelly processed via
ReLU activation functions to upscale accuracy and obtains
facial features of images flawlessly, as shown in Figure 2.
This input is shared and the kernel size is the same
across all submodels for feature extraction. Before a final
output layer allows classification, the outputs from these
feature extraction sub-models are flattened into vectors,
concatenated into a large vector matrix, and transferred
to a fully connected layer for assessment. A detailed
step of the methodology is described in the architecture
below.
The suggested CNN model, as shown in Figure 2, con-
sists of a batch normalization layer, seven convolutional
layers with independent learnable filters (kernels), each
with a size of [3 × 3], and a local contrast normalization
layer to eliminate the average from nearby pixels. A max-
pooling layer is also included in order to flatten and create
dense layers while also reducing the spatial dimension
of the image. It is followed by a layer that is entirely
Figure 3. Facial detection and conversion to grayscale.
connected and SoftMax, which categorizes seven emotions.
The fully connected layer received a dropout of 0.5 to
reduce over-fitting, and the rectified linear units (ReLU)
activation function was applied to all layers. After that, a
SoftMax output layer that can classify is connected to the
concatenation of two comparable models.
Real-Time Classification
The output of the DCNN model is saved as a JSON string
file. A JavaScript Object Notation (JSON) was deemed
suitable for this research because it stores and allows
faster data exchange, according to Ingale et al. [23]. The
model.tojson() function of python is used to write the
output of the trained model into JSON. A pre-trained Haar
Cascade XML file for frontal face detection of real-time
facial feature classification was imported. A multiscale
detection approach was implemented, and parameters
such as coordinates of bounding boxes around detected
faces and detectMultiScale (grayscale inputs) and scale
factor were tuned for better efficiency.
In this research, OpenCV’s Haar Cascade detects and
extracts the face region from the webcam’s video feed
through the flask app. This process follows a video con-
version to grayscale, and the detected face is contoured
or enclosed within a region surrounding the face (see
Figure 3).
EXPERIMENTAL DETAILS
Dataset
The Kaggle repository’s facial emotion recognition (FER-
2013) dataset is used in this study. The FER-2013 dataset
has 35,887 photos in total, of which 28,709 are tagged
images and the rest 7,178 are part of the test set. The
photographs in the FER-2013 dataset are categorized into
seven universal emotions: happy, sad, angry, fear, surprise,
disgust, and neutral. The photos are 48 × 48 pixels in
size and are grayscale. Table 2 provides a summary of
the dataset. The models are trained on an Nvidia Tesla
K80 GPU running on Google Cloud (Colab Research).
It is a group-based alternative to an iPython or Jupyter
Notebook.

Table 2. Summary of the FER-2013 dataset.
Surprise Fear Angry Neutral Sad Disgust Happy Total
train_count 3171 4097 3995 4965 4830 436 7215 28709
Surprise Fear Angry Neutral Sad Disgust Happy
test_count 831 1024 958 1233 1247 111 1774 7178
Total Count of the test dataset 35887
Pre-processing
Each image sample underwent a single application of
the face detection and registration techniques. They are
required for this procedure in order to correct any pose and
illumination variations that may have resulted from the
real-time facial detection operation. Keras library was used
in this research for the pre-processing of both the test and
train images before passing them to the deep convolution
neural network (DCNN). This process includes cropping of
detected faces and scaling of the detected images. For data
cleaning purposes, all image targetsizes were resized to a
dimension of 48 × 48 × 1, converted into a grayscale color
channel, and pre-processed in a batch size of 120. Square
boxes were also used for facial landmark detection to apply
illumination correction.
Training and Validation
This research used the Keras library in python to accept
images to train. To minimize the losses of the neural
network during training, this research used a Mini-Batch
Gradient Descent algorithm. This type of Gradient Descent
algorithm was suitable because of its capabilities in finding
the coefficients or weights of neural networks by splitting
the training dataset into small batches, i.e., a training
batch and a validation batch, using data augmentation
techniques. From Keras, a sequential model was imple-
mented to define the flow of the DCNN, after which several
other layers, as described in the proposed methodology
above and shown in Figure 2. With an increase in the
convolutional layers, a concurrent increase in the kernel
size was also adopted, which was used in parallel with the
ReLU activation function for training the model. Dropouts
were used at several layers of the DCNN to prevent the
overfitting of the model. A SoftMax activation function and
an Adam optimizer were used to improve the classifica-
tion efficiency of the model. This research also adopted a
categorical cross-entropy loss function. A summary of the
DCNN structure is shown in Table 3.
Image Data Augmentation
For efficient generalization and optimized model perfor-
mance, augmentation was used to expand the size of the
training dataset by creating several modified variations of
the images using the ImageDataGenerator Class in Keras.
Here a target image was converted in an index of 0 to aug-
mented variations, then looping it through nine instances
Table 3. Summary of the proposed DCNN layers.
Layer (Type) Output Shape Param #
Rescaling (Rescaling) (None, 48, 48, 1) 0
sequential (Sequential) (None, 48, 48, 1) 0
conv2d_7 (Conv2D) (None, 46, 46, 32) 320
conv2d_8 (Conv2D) (None, 44, 44, 64) 18496
max_pooling2d_4 (MaxPooling2 (None, 22, 22, 64) 0
dropout_3 (Dropout) (None, 22, 22, 64) 0
conv2d_9 (Conv2D) (None, 20, 20, 64) 36928
conv2d_10 (Conv2D) (None, 18, 18, 64) 36928
conv2d_11 (Conv2D) (None, 16, 16, 128) 73856
conv2d_12 (Conv2D) (None, 6, 6, 128) 147584
conv2d_13 (Conv2D) (None, 4, 4, 256) 295168
dropout_4 (Dropout) (None, 1, 1, 256) 0
flatten_1 (Flatten) (None, 256) 0
dense_2 (Dense) (None, 1024) 263168
dropout_5 (Dropout) (None, 1024) 0
dense_3 (Dense) (None, 7) 7175
Total params: 879,623
Trainable params: 879,623
Non-trainable params: 0
of different emotions to see what predictability would look
like during the test, as illustrated in Figure 4.
Hyperparameter Tuning
A hyperparameter is a parameter whose value is used
to control the training process of a model (neural net-
work). Hyperparameter optimization entails choosing a set
of optimal hyperparameters for a learning algorithm to
improve the generalization or predictability of a model.
For this research, the random search technique is used
wherein random combinations of a range of values for each
hyperparameter have been used to find the best possible
combination. The effectiveness of the random search tech-
nique for hyperparameter optimization has been demon-
strated in Ref. [24].
RESULT ANALYSIS AND DISCUSSION
The algorithm and facial emotion recognition model pro-
posed by this research is based on two principal ideas.
First, the utilization of high-capacity deep convolutional

Figure 4. Result of image data augmentation.
Table 4. Describes all the hyperparameters used by the proposed model and their corresponding values.
Hyperparameter Value Description
Batch size 120 The number of images (from the training set) to be propagated through the network at a go.
Number of epochs 80 The number of complete passes through the training set.
Optimizer Adam Adam Optimization algorithm.
Learning rate (lr) 0.001 Controls the speed at which weights of the network are updated during training.
FC1 neurons 1024 Total number of neurons in the first fully connected layer
FC2 neurons 512 Total number of neurons in the second fully connected layer
Dropout 0.5 Dropout rate between fully connected layers
Convolution kernel size 3x3 Size of the kernel in each convolution layer
MaxPooling kernel size 2x2 Size of the kernel in each MaxPooling layer
MaxPooling strides 2 Kernel stride in each MaxPooling layer
neural networks for feature extraction and emotion clas-
sification, which employs a single classifier for detecting
faces from multiple views over both real-time scenarios
and digital images or video frames. This research also
sought to optimize the computational complexity of the
deep convolutional neural network (DCNN) by modifying
the architecture through the addition of layers to improve
pattern identification in real-time or digital images. The
additional layers apply more convolution filters to the
image to detect features of the image. To further enhance
the model’s predictive efficiency and accuracy, the number
of training Epoch was increased to 80.
The proposed model for emotion recognition uses three
steps—face detection (see Figure 3), features extraction,
and emotion classification—and achieves better results
than the previous model. In the suggested method, val-
idation accuracy rises as calculation time decreases, and
validation loss is significantly decreased. The FER-2013
dataset, which includes the seven main emotions, was used
to test the proposed DCNN model (sad, fear, happiness,
angry, neutral, surprised, and disgust).
Figure 5 indicates the test sample result associated with
happy emotions from the digital test image. The proposed
model also predicted the identical emotion with decreased
computation time compared to preceding models dis-
cussed in the literature review.
Table 5 describes the metrics used in measuring the suc-
cess of the CNN model developed for this research. Given
the necessary modifications made as proposed earlier, it
was observed that, on average, the proposed model had

Figure 5. Result of real-time test sample associated with the
HAPPY emotion.
Table 5. Showing the evaluation metrics for the proposed CNN.
Precision Recall F1-Score Support
Angry 0.62 0.64 0.63 958
Disgust 0.73 0.34 0.45 111
Fear 0.56 0.42 0.48 1024
Happy 0.91 0.91 0.91 1774
Neutral 0.64 0.71 0.67 1233
Sad 0.56 0.62 0.59 1247
Surprise 0.79 0.81 0.72 831
Accuracy 0.70 7178
Macro avg 0.69 0.65 0.66 7178
Weighted avg 0.70 0.70 0.70 7178
Figure 6. Plots of the training and validation accuracy.
a predictive accuracy of 70%. The weighted average of the
test dataset is also 70%.
After the training was done, the model was evaluated
and the training and validation accuracy (Figure 6) and loss
(Figure 7) were computed.
Figures 6 and 7 show the CNN model’s learning curve,
which plots the model’s learning performance over experi-
ence or time. After each update, the model was evaluated
on the training dataset and a hold-out validation dataset.
Learning curves were preferred as a graphic metric for
this research because of their wide adoption in machine
learning for models that optimize their internal parameters
Figure 7. Plot of the training and validation loss.
Figure 8. Confusion metrics of the model on emotion prediction.
incrementally. From the learning curve in Figure 7, it can be
observed that the plot of training loss and validation loss
declines to the point of stability with a generalization gap
of minimal difference. Also, it can be inferred in Figure 6
that the plot of training accuracy and validation accuracy
surges with an increase in training sequence and batch
size with a minimal generalization gap. Thematically, the
model can be a good fit and is proposed to generalize
efficiently.
Figure 8 shows the CNN model’s confusion matrix on
the FER2013 testing set. It was inferred that the model
generalizes best in the classification of “happiness” and
“surprise” emotions. In contrast, it performs reasonably
average when classifying “disgust” and “fear” Emotion.
This reduction in classification accuracy in “disgust” and
“fear” emotions can be ascribed to the reduced number of
training set samples for the two classes. The complacency
between “fear” and “sadness” may be due to the inter-class
similarities of the dataset.

CONCLUSION
This paper proposed a deep CNN model for real-time facial
expression recognition based on seven emotional classes
(‘neutral’, ‘happy’, ‘sad’, ‘angry’, ‘surprised’, ‘fear’, and
‘disgusted’). The structure of the proposed model has good
generality and classification performance. First, a variety
of well-classified, high-quality databases were acquired.
Then, the face region is detected, cut, and converted into
a grayscale image of one channel to remove unnecessary
information. Image data augmentation that increases the
number and variations of training images is applied to
solve the problem of overfitting. Hyperparameter tuning
was employed to achieve a state-of-the-art classification
performance accuracy of 70.04%.
In the proposed hybrid architecture, an optimal structure
to reduce execution time and improve the classification
performance of real-time and digital images was devel-
oped. This was done by adjusting the number of feature
maps in the convolutional layer, layers in the neural
network model, and numerous training epochs. Cross-
validation experiments showed that the proposed con-
volutional neural network (CNN) architecture has better
classification performance and generality than some state-
of-the-arts (SoTA). The Haar Cascade model employed
for real-time facial detection showed better classification
performance than other implementations. Experimental
results confirmed the effectiveness of data pre-processing
and augmentation techniques.
Some shortcomings in this research were a deficiency
in predicting the ‘disgust’ and ‘angry’ emotions due to
insufficient training dataset for the two-class categories.
Another issue the proposed model faces is the reduced
generality of real-time predictions. A major causative
factor stems from the postured nature of the training
images and environmental conditioning (lightening) of
real-time test images. A significant impact of this research
in human–computer interaction (HCI) will be the upscal-
ing of software and AI systems to deliver an improved
experience to humans in various applications, for instance,
in Home robotic systems in the recommendation of mood-
based music. This research will enhance psychological
prognosis by assisting psychologists in detecting prob-
able suicides and emotional traumas, and it can also
be employed in the marketing, healthcare, and gaming
industry.
FUTURE RESEARCH PROPOSAL
Recognizing human facial expressions is an important
practice since it helps to determine a subject’s mood or
emotional state while they are being observed. Numerous
situations could benefit from the straightforward idea of
a machine being able to recognize a person’s emotional
state. As such, numerous potentials remain untapped in
this area. State-of-the-art real-time algorithms (Faster R-
CNN, HOG + Linear SVM, SSDs, YOLO) are encouraged
to be employed in future research as well. In addition,
advancement to this research may include the utilization of
regression in analyzing bio-signals and physiological mul-
timodal features in determining the levels and intensities
of emotion classes discussed herein.
ABBREVIATIONS
DCNN Deep Convolutional Neural Network
CNN Convolutional Neural Network
FER Facial Emotion Recognition
GPU Graphical Processing Unit
HCI Human Computer Interaction
ECG Electrocardiography
FMRI Functional Magnetic Resonance Imaging
AFEW Acted Facial Expressions in the Wild
RNN Recurrent Neural Network
LSTM Long Short-Term Memory
HMM Hidden Markov Model
ReLU Rectified Linear Unit
TFE Tandem Facial Expression
ANN Artificial Neural Network
SVM Support Vector Machine
IRNN Image Recognition Neural Network
FERET Facial Recognition Technology
SoTA State-of-The-Art
DISCLOSURE
The authors declare that they have no competing interests.
AUTHOR CONTRIBUTIONS
All authors made significant contributions to conception
and design, data acquisition, analysis, and interpretation;
participated in drafting the article and critically revising it
for important intellectual content; agreed to submit it to the
current journal; and gave final approval of the version to be
published.
DATA AVAILABILITY STATEMENT
This research paper analyzes the Facial Emotion Recogni-
tion (FER-2013) dataset housed by the Kaggle repository
[https://www.kaggle.com/datasets/msambare/fer2013].
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