Preliminary Stages for COVID-19 Detection Using Image Processing
Abstract
:1. Introduction
- We analyze how various preprocessing techniques can be used to enhance feature extraction in each of the investigated works.
- We present a detailed discussion of the different segmentation approaches employed in each reviewed paper, with the goal of delivering significant features that are reliable for COVID-19 detection.
- We provide a comprehensive analysis of the various augmentation methods employed to address the issue of a lack of images available for COVID-19 detection.
- We present a complete investigation of the various feature extraction techniques used to distinguish COVID-19 images from normal images.
2. Concept and Background
3. Source of Information
3.1. X-ray
3.2. Computed Tomography (CT)
3.3. Ultrasound
- Image acquisition is user dependent.
- The field of view is limited.
- Ultrasound images are typically acquired off-plane compared to the true axial, sagittal, or coronal planes, resulting in difficulty in correlating them with other cross-sectional imaging methods.
- Lesional identification can be difficult due to its echogenicity relative to the organ that is scrutinized.
- The quality of imaging can be affected by the physical characteristics of the patient [24].
4. Related Surveys
5. Taxonomy of the Preliminary Stages for COVID-19 Detection
6. Preprocessing
- Reducing or eliminating the impact of data variability on model performance, as images are obtained from a variety of datasets with varied image sizes and acquisition conditions [35].
- Improving the contrast of an image [12].
- Producing accurate and consistent findings when classifying COVID-19 from chest images.
- Making the illness zone in the image more evident in comparison to the original image [12].
6.1. Image Resizing
6.2. Image Filtering
6.3. Color Space Transformation
6.4. Normalization and Rescaling
6.5. Image Enhancement
7. Data Augmentation
7.1. Traditional Data Augmentation Approach
7.1.1. Geometric Transformations
7.1.2. Photometric Transformations
7.2. Deep Learning Data Augmentation Approach
8. Segmentation
8.1. Traditional Segmentation
8.2. Deep Learning Segmentation
- The FCN architecture has been employed for lung segmentation in COVID-19 patients. In this architecture, FC layers are replaced with convolutional layers to record the output as a local map. These maps are up-sampled using the previously mentioned method, which employs backward convolution learning with certain stride size. A 1 × 1 convolution layer at the network’s end produces the corresponding pixel label as the output. The output detail quantity of this layer is constrained by the current stride size in the deconvolution stage. Several skip connections have been introduced to the network from the lower levels to the end layer to address this issue and improve the quality of the results [83].
- The SegNet decoder is designed in such a way that an up-sampling layer is positioned in the decoder for each down-sampling layer in the encoding section, unlike the deconvolution layers in FCN networks. These layers are incapable of learning; when the extraction values of the maximum pooling layer are located, and the remaining output cells are set to zero [84].
- While the U-Net network has the same amount of pooling and up-sampling layers as SegNet, it uses trainable deconvolution layers instead. In addition, the up-sampling and down-sampling layers in this network have a matching skip connection [85]. For COVID-19 diagnosis applications, U-Net is a widely utilized technique for segmenting both lung regions generally and affected lung regions [82,86,87].
- The Res2Net module separates feature maps into numerous subsets and processes them through a set of 3 × 3 filters after 1 × 1 convolution. The outputs are combined, then 1 × 1 convolution is applied. The set of this process is residually structured, and it is consequently called the Res2Net module. The scale dimension (the number of feature groups in the Res2Net block) is a parameter included in this module; as the scale increases, the model learns features with larger receptive field sizes. Res2Net can be used in conjunction with current modules such as cardinality dimension, squeeze, and excitation. In addition, it can be easily combined with several other models, such as ResNeXt, ResNet, DLA, and Big Little Net [88].
- UNet++ is made up of an encoder and a decoder that are linked together by a sequence of layered dense convolutional blocks. Prior to fusion, the semantic gap between the encoder and decoder feature maps are bridged. The encoder extracts feature by down-sampling, while the decoder maps feature to the original image by up-sampling and performs pixel classification to achieve the goal of segmentation. Zhou et al. [89] developed UNet++, which is significantly more sophisticated than U-Net, as it inserts a nested convolutional structure between the encoding and decoding paths. Clearly, such a network can increase segmentation performance. Consequently, the training process is more difficult.
- VB-Net is a modified three-dimensional convolutional neural network that integrates V-Net 14 and the bottleneck structure of V-Net 15. VB-Net is divided into two pathways. The first is a contracting path that uses down-sampling and convolution to extract global image features. The second is a broad approach that includes up-sampling and operations to combine fine-grained image data. A bottleneck structure is implemented into VB-Net 15, which makes it much faster than V-Net 14 in terms of speed. A three-layer stack is used in the bottleneck design. The first layer, with a 1 × 1 × 1 kernel, reduces the number of channels and feeds the data for a conventional 3 × 3 × 3 kernel layer processing, then the channels of the feature maps are restored by another 1 × 1 × 1 kernel layer. The three layers utilize 1 × 1 × 1, 3 × 3 × 3, and 1 × 1 × 1 convolution kernels. The model size and inference time are significantly decreased by combining and minimizing the feature map channels and cross-channel features, which are efficiently fused by convolution. As a result, VB-Net is more suitable for handling huge amounts of 3D volumetric data than the classic V-Net.
9. Feature Extraction
9.1. Traditional Feature Extraction Method
9.2. Deep Learning Feature Extraction Based on Transfer Learning
10. Discussion and Future Research Directions
- Determining how to automatically choose the best parameters for the preprocessing methods discussed in the literature (resizing, rescaling, normalization).
- Evaluating the effectiveness of COVID-19 detection systems using various preprocessing techniques.
11. Conclusions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Abbreviations
MDPI | Multidisciplinary Digital Publishing Institute |
DOAJ | Directory of open access journals |
TLA | Three letter acronym |
LD | Linear dichroism |
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Datasets | Description | Source | References |
---|---|---|---|
COVID-19, SARS, MERS X-ray Images Dataset | Includes 423 COVID-19, 134 SARS, and 144 MERS images with the corresponding lung masks | Developed by researchers from Qatar University and the University of Dhaka | Yazan Qiblawey (2022) Last updated: 12 January 2022 http://doi.org/10.34740/kaggle/dsv/3034344 |
COVID-19 Pneumonia-Normal Chest X-ray Images | Includes COVID-19, normal, and pneumonia images | Collected from different sources including GitHub, Radiopaedia, The Cancer Imaging Archive (TCIA), and the Italian Society of Radiology (SIRM) | Sachin Kumar (2022) Last updated: 14 June 2022 http://doi.org/10.17632/dvntn9yhd2.1 |
COVID-19 Digital X-rays Forgery Dataset | Includes COVID-19, CM COVID-19, S COVID-19, Normal images, CM Normal, S Normal, Viral Pneumonia, S Viral Pneumonia, and CM Viral Pneumonia | Modified dataset from “COVID-19 Radiography Database” | Nour Eldeen Khalifa (2022) Last updated: 17 March 2022 http://doi.org/10.17632/3bzv6t24ts.1 |
QaTa-COV19 Dataset | Contains two datasets: the QaTa-COV19 Dataset (Extended) includes 9258 COVID-19 chest X-ray images, while the Early-QaTa-COV19 Dataset includes 1065 chest X-rays | Developed by researchers from Qatar university and Tampere university | aysendegerli (2022) Last updated: 22 February 2022 https://www.kaggle.com/aysendegerli/qatacov19-dataset |
Chest X-ray Dataset for Respiratory Disease Classification | Includes five classes from 32,687 chest X-ray radiography images with reasonable resolution (COVID-19, pneumonia, tuberculosis, lung opacity, and normal) | Combination of multiple different datasets gathered from diverse sources | Harvard Dataverse (2022) Last updated: 10 February 2022 http://doi.org/10.7910/DVN/WNQ3GI |
COVID Pneumonia dataset | Includes 1950 X-ray images with three classes (COVID, normal, and pneumonia) | Italian Society of Medical, Radiopaedia, and NIH Clinical Center | Redwanul Islam (2022) Last updated: 3 January 2022 https://www.kaggle.com/redwan1010/covid-pneumonia-dataset |
xray-binary-covid | Processed COVID-19 X-ray images for DL models. Includes 2000 COVID and 2000 normal images | Information is not available | Aravind Lade (2022) Last updated: 8 February 2022 https://www.kaggle.com/aravindlade/xray-binary-covid |
COVID-19 Chest X-ray Image Repository | Includes 900 images. Several of the images are of children or early-stage patients for whom the radiologist noticed no unique imaging findings | Gathered from a variety of online sources | Arman Haghanifar; Mahdiyar Molahasani Majdabadi; Seokbum Ko (2022) Last updated: 2 February 2022 http://doi.org/10.6084/m9.figshare.12580328.v3 |
COVID-19 Radiography Database | Includes lung masks and 3616 COVID-19 chest X-ray pictures | Developed by researchers from Qatar University, and the University of Dhaka along with their Pakistani and Malaysian counterparts, and medical practitioners conducted the study | Tawsifur Rahman (2022) Last updated: 19 March 2022 https://www.kaggle.com/tawsifurrahman/COVID19-radiography-database |
X-ray Image Dataset For COVID-19 Detection (A) | Includes 392 X-ray images (COVID and normal) | Collected from “COVID-chestxray-dataset” in GitHub and “chest-xray-pneumonia” in kaggle | Mohammed Ali-11 (2022) Last updated: 22 March 2022 https://www.kaggle.com/datasets/mohammedali11/xray-image-dataset-for-covid19-detection-a |
Curated COVID-19 Chest X-ray Dataset | Includes 9208 chest x-rays (normal, COVID-19, and pneumonia) | Derived from the “Curated Dataset for COVID-19 Posterior-Anterior Chest Radiography Images (X-rays)” | Francis Jesmar Montalbo (2022) Last updated: 25 March 2022 https://www.kaggle.com/datasets/francismon/curated-covid19-chest-xray-dataset |
COVID-19 Pakistani Patients X-ray Image Dataset | Includes 390 COVID-19 and 60 normal chest X-ray Images | Developed by researchers from Edinburgh Napier University UK, HITEC University Taxila, and PNEC Karachi, Pakistan along with their collaborators from Kingdom of Saudi Arabia and in collaboration with medical doctors | Muhammad Shahbaz Khan (2022) Last updated: 21 May 2022 https://www.kaggle.com/datasets/muhammadshahbazkhan/covid19-pakistani-patients-xray-image-dataset |
Datasets | Description | Source | References |
---|---|---|---|
COVID-CTset: A Large COVID-19 CT Scans dataset | Includes 63,849 CT images of 377 patients (15,589 obtained from 95 COVID-19 patients and 48,260 CT scan from 282 normal individuals). One of the largest COVID-19 CT scan datasets for AI researchers | Iran’s Negin medical center, located in the city of Sari | Mohammad Rahimzadeh (2022) Last updated: 7 March 2022 https://www.kaggle.com/mohammadrahimzadeh/covidctset-a-large-covid19-ct-scans-dataset |
HRCTv1-COVID-19 | Includes 181,106 images obtained from 395 patients: GGO (288 cases), Crazy Paving (57 cases), and Air Space Consolidation (27 cases), as well as 23 cases with a negative diagnosis | Sfahan University of Technology, Arak University of Medical Sciences, Isfahan University of Medical Sciences, Islamic Azad University Science and Research Branch | Iraj abedi (2022) Last updated: 5 May 2022 http://doi.org/10.17632/nc5g3zs7g7.2 |
COVID-19 CT Dataset | Includes 368 medical findings in Chinese and 1104 chest CT scans | Constructed by Shenzhen Research Institute of Big Data (SRIBD), Future Network of Intelligence Institute (FNii) and CUHKSZ-JD Joint AI Lab | Chinese University of Hongkong, Shenzhen, China (2022) https://paperswithcode.com/dataset/covid-dataset accessed on 7 December 2022 |
COVID-19 Omicron and Delta Variant Lung CT Scans | Includes 14,482 CT scans (12,231 positive for COVID-19 and 2251 negative); data are available as 512 × 512 px JPG images | Collected from patients in radiology centers of teaching hospitals of Tehran, Iran | M Amir Eshraghi (2022) Last updated: 7 February 2022 https://www.kaggle.com/mohammadamireshraghi/covid19-omicron-and-delta-variant-ct-scan-dataset |
Datasets | Description | Source | References |
---|---|---|---|
Data from: Use of lung ultrasound in neonates during the COVID-19 pandemic | Includes 27 ultrasound images of the lungs of newborns with a suspected or confirmed diagnosis of COVID-19, differentiating between disease-related and non-disease-related alterations | - | Marcia Wang Matsuoka (2021) Last updated: 25 March 2021 http://doi.org/10.6084/m9.figshare.14278767.v1 |
COVID-19 Dataset | Includes ultrasound images grouped as COVID, pneumonia, and regular | Kafrelsheikh University | Ahmed sedik (2020) Last updated: 9 May 2022 http://doi.org/10.17632/6rs5mnvktk.1 |
References | Preliminary Stages Before the Detection Process | Database Description | |||
---|---|---|---|---|---|
Preprocessing | Augmentations | Segmentation | Feature Extraction | ||
[6] | no | no | yes | no | Brief (low) |
[14] | no | no | yes | no | Medium |
[26] | no | no | no | no | Detail (high) |
[29] | no | no | yes | no | Medium |
[31] | no | no | yes | no | Brief (low) |
[27] | no | no | no | no | Medium |
[30] | no | yes | yes | no | Detail (high) |
[28] | no | no | no | no | Detail (high) |
[33] | no | no | yes | no | Detail (high) |
[32] | yes | yes | yes | no | Brief (low) |
Our Study | yes | yes | yes | yes | Detail (high) |
Augmentation Methods | Purpose | Augmentation Techniques | Dataset | Author |
---|---|---|---|---|
Geometric Transformations | Reduce the bias caused by the properties of CXR images | flipping, zooming, shifting | CXR images | [67] |
Increase dataset size | rotating, scaling | CXR images | [66] | |
Propose a robust technique for automatic detection of COVID-19 pneumonia | rotating, scaling, translation | X-ray images | [68] | |
Increase dataset size to achieve efficient and consistent accuracy | flipping, rotating, skewing | X-ray and CT images | [42] | |
Solve overfitting problem | rotating, shearing, translation, novel data augmentation | CT images | [69] | |
Improve CNN model training and classification accuracy | flipping, rotating, translation | X-ray images | [70] | |
Generate more samples | flipping, rotating, translation | X-ray images | [71] | |
Prevent overfitting | rotating, zooming, shearing. | X-ray images | [65] | |
Increase training set size | flipping, rotating, scaling, Gaussian noise addition | X-ray images | [41] | |
Photometric Transformations | Enhance images | sharpening, blurring, brightness, contrast adjustment | X-ray images | [72] |
Avoid model overfitting | blurring, sharpening, contrast adjustment | CT images | [73,74] | |
Avoid model overfitting | blurring, sharpening, contrast adjustment | X-ray images | [68] | |
Geometric and Photometric Transformations | Increase training samples and improve generalization | cropping, blurring, Gaussian noise addition, brightness and contrast adjustment, flipping | CXR images | [53] |
Increase training samples and improved generalization | cropping, blurring, Gaussian noise addition, brightness and contrast adjustment, flipping | CT images | [75] | |
DL Augmentation | Improve COVID-19 detection | Augmentation based on basic image alteration and GANs | X-ray and CT images | [76] |
Overcome overfitting problem and generate more images | GAN | X-ray images | [77] | |
Traditional and DL Augmentation | Generate a balanced training set | Rotation and translation (CNNs) | X-ray images | [68] |
Assess data augmentation impact on the accuracy of COVID-19 detection | Variety of traditional image transformations and GANs | X-ray and CT images | [76] | |
Generate additional images and improve classification performance. | Traditional data augmentations with CGAN | CT images | [78] |
Pre-Trained CNN Models | X-rays Studies | CT-Scans Studies | Advantages | Disadvantages |
---|---|---|---|---|
VGG-family [110] | [34,41,53,103,104] | [41,108] |
|
|
ResNet-family [111,112] | [41,54,103] | [56,89,108,109] |
| Increased overhead due to:
|
Inception- family [113,114] | [41,54] | [56,89,108] |
|
|
AlexNet [115] | [41,103] | [56,89] |
|
|
MobileNet [116] | [41] | [56] |
|
|
SqueezeNet [117] | [41] | [56] |
|
|
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Alhaj, T.A.; Idris, I.; Elhaj, F.A.; Elhassan, T.A.; Remli, M.A.; Siraj, M.M.; Mohd Rahim, M.S. Preliminary Stages for COVID-19 Detection Using Image Processing. Diagnostics 2022, 12, 3171. https://doi.org/10.3390/diagnostics12123171
Alhaj TA, Idris I, Elhaj FA, Elhassan TA, Remli MA, Siraj MM, Mohd Rahim MS. Preliminary Stages for COVID-19 Detection Using Image Processing. Diagnostics. 2022; 12(12):3171. https://doi.org/10.3390/diagnostics12123171
Chicago/Turabian StyleAlhaj, Taqwa Ahmed, Inshirah Idris, Fatin A. Elhaj, Tusneem A. Elhassan, Muhammad Akmal Remli, Maheyzah Md Siraj, and Mohd Shafry Mohd Rahim. 2022. "Preliminary Stages for COVID-19 Detection Using Image Processing" Diagnostics 12, no. 12: 3171. https://doi.org/10.3390/diagnostics12123171