Automated classification of diseased cauliflower: a feature-driven machine learning approach

Headnote

ABSTRACT

Cauliflower is a popular winter crop in Bangladesh. However, cauliflower plants are vulnerable to several diseases that can reduce the cauliflowers' productivity and degrade their quality. The manual monitoring of these diseases takes a lot of effort and time. Therefore, automatic classification of the diseased cauliflower through computer vision techniques is essential. This study has retrieved ten different statistical and gray-level co-occurrence matrix (GLCM)-based features from the cauliflower image dataset by implementing a variety of image processing techniques. Afterwards, the SelectKBest method with the analysis of variance f-value (ANOVA F-value) has been used to identify the most important attributes for classification of the diseased cauliflower. Based on the ANOVA F-value, the top N (5<N <9) most dominant attributes is used to train and test five machine learning (ML) models for classification of diseased cauliflower. Finally, different performance metrics have been used for evaluating the effectiveness of the employed ML models. The bagging classifier achieved the highest accuracy of 82.35%. Moreover, this model has outperformed other ML classifiers in terms of other performance metrics also.

Keywords:

Analysis of variance Bagging classifier Cauliflower Image processing Machine learning

1. INTRODUCTION

Agriculture significantly contribute in the economic advancement of Bangladesh, which is fuelled by a variety of factors [1]. According to the Bangladesh Bureau of statistics, agriculture products, which include crops, livestock, fisheries, and forest products, made up 12.5% of the country's gross domestic product (GDP) and employed around 40% of the population [2]. The majority of agriculture in Bangladesh is based on traditional subsistence farming. Therefore, with limited resources and arable land, the development of new technologies can boost productivity and income levels.

The realm of machine learning (ML) and computer vision is experiencing a substantial surge in agricultural research to ensure a better production by introducing automatic disease classification, automatic measurement of seed, and soil quality. At present, computer vision technology is employed for various agricultural activities, including the classification of plant diseases, predicting crop outputs, species identification, irrigation management, and soil preservation. Developed nations have already made substantial use of modern agricultural technology, but it is unfortunate that the new technology has received little attention in Bangladesh's agricultural sector [3], [4].

Bangladesh produces a variety of agricultural products, such as rice, fruits, vegetables, and wheat. Among the agricultural goods produced, vegetables and fruit play a key role in maintaining a healthy body. A study examining the dietary habits of over 469,000 participants found that consuming more fruits and vegetables is linked to a decreased risk of death from cardiovascular disease, with a 4% average decrease in risk for every additional serving per day [5].

Bangladesh is naturally blessed with highly fertile land where a variety of crops such as food grains, cash crops, vegetables, and fruits are easily grown. Cauliflower is one of the most popular winter vegetable crops in Bangladesh and in the other countries of the world. It is cultivated in almost all areas of Bangladesh during the winter season, but now cauliflower is cultivated throughout the year due to its popularity and nutritional value. Although, the white flower-like part of cauliflower is usually used for cooking purposes, the stalk and surrounding thick, green leaves are also used in vegetable broths or can be fed as fodder for animals [6], [7]. Cauliflower is a low-fat vegetable that is abundant in folate, water, vitamins A and C which can be very helpful in meeting the high nutritional needs of the human body [8]. Cauliflower, like others in the cabbage family, contains a variety of phytochemicals, which can protect against cardiovascular disease and cancer [9]. It is also helpful for controlling blood cholesterol levels and maintaining a healthy immune system. Considering the health benefits of cauliflower, attention should be paid to growing cauliflower in large quantities to meet the demand. In Bangladesh, the cultivation area for cauliflower spans approximately 9,400 hectares, with an annual production of roughly 73,000 metric tons [10]. The current production falls short of meeting the nutritional requirements of the country's sizable populace. There are several factors in the low production of cauliflower in Bangladesh such as seed quality, lack of irrigation, improper fertilizers and pesticides uses and disease attack. Moreover, the presence of diseases in cauliflower leaves and flowers negatively affects the yield and quality of the crop.

Many farmers in Bangladesh do not have enough knowledge or resources to correctly classify diseased cauliflower in time and because of this, farmers often use the wrong pesticides to treat their crops, which are more harmful to the crop as well as the soil. Early identification of diseased cauliflower can aid in preventing the spread of the disease to other fresh plants. Moreover, precise detection of the diseased cauliflower can help minimize crop losses by ensuring timely interventions. Conventional methods for categorizing diseased cauliflower are sluggish, expensive, demanding of labor, and time-intensive, especially in extensive crop fields. Additionally, farmers in remote rural areas of Bangladesh may be required to undertake long travels to seek advice from agricultural experts. Agriculture professionals, on the other hand, are unable to visit the local area at the proper time. Therefore, the development of an automated classification system to separate the diseased cauliflower would greatly help the farmers of rural areas to promptly detection of the diseased cauliflower and ensure a greater cauliflower yield.

Considering above situation, this paper focuses on developing a computer vision based automated classification system that can accurately classify the diseased cauliflower. The implemented system in this study utilizes image processing techniques to analyze images of the cauliflower crops, extract image features and lastly utilize machine learning models for classification of diseased cauliflower with high accuracy. Though we have applied the proposed approaches on cauliflower dataset only, this approach will be also workable for other vegetables addressing broader agricultural challenges in Bangladesh. The contribution of the study mainly includes the followings: i) collection of cauliflower crop images dataset for the study area of Bangladesh and ii) finding out the most important features for classifying the diseased cauliflower and ML model with promising accuracy.

The subsequent segments are arranged as follows: section 2 offers a brief summary of the related work. Section 3 illustrates the methodology adopted in this research work. Section 4 explains the experimental findings and analyze the performance of several ML techniques. Lastly, the article is concluded with mentioning the future work in section 5.

2. RELATED WORK

Numerous research have been carried out to categorize various diseases affecting plants, fruits, vegetables, and fish. This section discussed and reviewed some of the relevant studies. Durmus et al. [11] applied deep learning techniques, utilizing AlexNet and SqueezeNet as network architectures, to identify tomato leaf diseases. The study utilized the Plant Village dataset for training purposes. The obtained results showed that SqueezeNet is a suitable option for mobile deep-learning classification due to its efficiency and low computational requirements. Kurniawati et al. [12] presented a methodology for diagnosing three types of diseases of paddy. The researchers tested two different thresholding methods on 94 paddy leaf images to determine which provided the best accuracy. The highest accuracy, which was achieved through the use of the local entropy threshold, was 94.7%. Ferentinos [13] designed convolutional neural network (CNN) models for identifying and diagnosing plant diseases. A total of 87,848 images were utilized to train the model whereas the visual geometry group (VGG) model obtained an impressive success rate which is 99.53%. Lu et al. [14] put forth a new method for identifying rice diseases (10 diseases) utilizing CNN. The method was based on 500 natural images and achieved an accuracy of 95.48%. Youwen et al. [15] utilized support vector machine (SVM) classifier to identify diseases in cucumber leaves. The results showed that using a combination of shape and texture features was more effective than using only shape features. Ma et al. [16] identified four types of cucumber diseases employing a deep CNN (DCNN). The authors also evaluated the performance of applied models namely random forest (RF), SVM, and AlexNet. The DCNN performed well in recognizing symptoms using an augmented dataset comprising 14,208 symptom images, achieving an accuracy score of 93.4%. Jiang et al. [17] used deep learning to recognize three common diseases. Training accuracy of the Resnet-50 model was 98.3% and test accuracy was 98.0%. Mia et al. [18] conducted a thorough examination to identify fish diseases. They implemented eight classification models, and used performance evaluation metrics to assess their performance. Among the models, the accuracy of random forest (RF) model was the highest accuracy which was 88.87%. Saad et al. [19] employed different transfer learning approach to identify diseases in eggplants and the best accuracy was 99.06% obtained by DenseNet201. Habib et al. [20] conducted a comprehensive study for diagnosing jackfruit diseases. The study employed various classification models, and among them, RF obtained the highest accuracy that was 90%, whereas logistic regression had the lowest accuracy. Biswas et al. [21] presented an approach for identifying local birds of Bangladesh through the use of six CNN models with transfer learning technique. The method involved training on a dataset of 2,800 images and testing on 700 images. The best results were achieved with MobileNetV2. Mia et al. [22] identified the rare local fruits of Bangladesh. The study used a dataset of 480 images and applied the SVM algorithm for recognition. The SVM model demonstrated a high accuracy that is 94.79%. Biswas et al. [23] put forward a solution to classify disease affected carrots. They evaluated the performance of five machine learning classifiers where RF classifier achieved the accuracy of 94.17% which was the highest. Habib et al. [24] presented a methodology for the papaya diseases detection and classification. The system uses images captured through mobile devices or handheld devices. To segment the images, k-means clustering is used. The SVM classifier has been used and the accuracy was 90.15%. Habib et al. [25] conducted a comparison of nine well-known classifiers to identify diseases in papayas. Among all the models, SVM attained the highest accuracy of 95.2%.

3. METHODOLOGY

The methodology section is comprised of two main parts. In the first part, we have employed a variety of image-processing strategies to extract the statistical and GLCM-based features. Additionally, in the second part, we have employed different machine learning algorithms to identify the diseased cauliflowers effectively.

3.1. Feature extraction procedure

Extraction of features from the collected cauliflower images is given in the Figure 1. In this section, we discussed all the steps in detail that are involved into the feature extraction process. This procedure comprises steps like image resizing, contrast enhancement, color space conversion, and image segmentation by K-Means clustering.

3.1.1. Acquisition of image

This study does not require any ethical permission, as no human subjects were involved in the experiments. The process of obtaining images for the study began with a collection of 501 cauliflower images from the field. These images were then divided into two categories: diseased and healthy cauliflower images. Out of these images, 24.59% belong to disease-free cauliflower, while the remaining 75.41% represent diseased cauliflowers.

3.1.2. Resizing image into fixed size

The size of the collected data varies due to the fact that it was acquired by users with various devices from varied perspectives. To standardize the size of the collected images, images have been resized to 300x300 using bicubic interpolation. When we possess data concerning intensity values I as well as the derivatives fx, fy, and fxy at the four corners situated at (0, 0), (0, 1), (1, 0), and (1, 1) of a unit square, we can represent the interpolated intensity surface [24] using (1).

3.1.3. Contrast enhancement

After resizing the images, we enhanced their contrast by employing the histogram equalization technique. This method is employed to reveal more information within the images and enhance their overall quality. Let's assume that we have X rows (representing height) and Y columns (representing width) measured in pixels, with each pixel represented by a color intensity (Ct) and an associated pixel count (Pk), and the image's intensity levels denoted as I. In this context, the processed image [24] is generated by transforming each pixel's Ck value into a corresponding color intensity Sk as defined by (2).

3.1.4. Color space conversion

After improving contrast of the images, RGB was converted to L*a*b. This modification was necessary for improved performance in the segmentation technique using k-means clustering (3) from [24] was used to convert RGB to CIE (XYZ) and subsequently to L*a*b.

3.1.5. Image segmentation

Image segmentation with k-means clustering is a method that involves dividing an image into distinct segments based on color or feature similarity using the k-means clustering algorithm. This involves the following steps.

Assigning each pixel to the cluster that has the closest center value.

Segmenting the image based on color.

Selecting the cluster that contains only the region of interest (ROI).

3.1.6. Feature extraction

To classify the diseased cauliflower, various statistical and gray-level co-occurrence matrix (GLCM) features have been derived. Statistical features include mean (MEAN), variance (VAR), standard deviation (SD), kurtosis (KURT), and skewness (SKEW). This features are described as follows. In the following from (8)-(12) concerning statistical features, x, is the i* gray level (out of a total of L possible value), whose probability of occurrence is P(xt) [23], [24]. The moment and mode is represented by // and Mo, respectively.

3.2. Diseased Cauliflower classification using ML model

In this section, the process of using extracted features to classify diseased cauliflower is explained. Figure 2 illustrates the implementation procedure to classify diseased cauliflower. The implementation procedure starts with splitting the inputted dataset. Then, we have performed feature selection to identify the most important features. After that we have employed different machine learning classifiers to identify the diseased cauliflowers. Finally, the performances of the machine learning models have been compared using different performance metrics.

3.2.1. Dataset splitting

Data splitting is required to train and test the ML models. After extracting the features, training data and testing data have been separated. During the testing phase, 20% of the dataset was utilized, whereas 80% of the dataset was allocated to train the ML models.

3.2.2. Feature selection

In this step, the ANOVA F-values of the features have been measured. Considering the ANOVA F-values, we have chosen the top N (5<N<9) attributes having the highest ANOVA F-scores. Based on these top N features, the new training and testing datasets have been prepared to train and test the ML models. Table 2 shows the ANOVA F-scores for the features used in this study. The features are arranged in descending sequence based on their ANOVA F-scores. By employing feature selection techniques, we have eliminated less important features, which has enhanced the scalability of the proposed system by reducing training and testing times.

3.2.3. Applying ML classifier

To classify the diseased cauliflower, five machine learning models have been utilized. Each machine learning model that has been considered has its own unique properties and characteristics. Therefore, in the study, five ML models are RF, SVM, AdaBoost, bagging, and gradient boosting.

3.2.4. Performance evaluation

After applying the classifier, we have measured the performance (accuracy, recall, precision, Fl-scores) of the different applied ML models using the following (18) to (21).

4. FINDINGS AND RESULT ANALYSIS

The performance of ML models in categorizing diseased cauliflower has been evaluated. For comparing the applied ML models performance, different metrics like accuracy, recall, precision, Fl-scores have been calculated. Based on the ANOVA F-scores, the top N features (5<N<9) is selected to train and test the machine learning models. To evaluate the actual effects of the employed feature selection techniques (ANOVA F-scores), we have also trained and tested the proposed ML models with the dataset having all the features. The applied ML models performance of this study is illustrated in Table 3. It can be found that the bagging classifier achieves the highest accuracy of 82.35% while considering the top 9 features (contrast, correlation, homogeneity, variance, standard deviation, mean, energy, skewness, and kurtosis) according to the ANOVA F-scores. It has outperformed other applied ML models in terms of recall (sensitivity) and Fl-scores also. Here, the recall, precision, and Fl-score of the bagging classifiers are 87.96%, 89.62% and 88.78%, respectively.

In terms of using all the 10 features, the bagging classifier showed similar performance to the earlier model trained with top 9 features. But there was a significant enhancement in the performance of the RF classifier after selecting the top 9 features. By taking all the features, the RF classifier achieved an accuracy of 79.41%. On the other hand, by considering the top 9 features, the accuracy of the RF classifier increased by more than 2%. There were also significant increases in the other metrics.

In terms of using the top 5, 6, 7, and 8 features, the effectiveness of the applied models degraded due to the elimination of important features. Additionally, the ROC curves of the proposed machine learning models have been plotted. Figure 3 represents the ROC curves of the models considering the top 9 features. The area under curve (AUC) value of the bagging classifier is 0.83 which is the highest among other applied

ML models. The AUC value of RF, gradient boosting, and AdaBoost classifiers are 0.81, 0.78, and 0.75, respectively. Conversely, the SVM classifier demonstrated the lowest AUC value of 0.69.

5. CONCLUSION Our proposed solution has the potential to support the agriculture field in Bangladesh by increasing the effectiveness and productivity of cauliflower through automated classification of diseased cauliflower. A total of ten features (GLCM and statistical) extracted from the collected image dataset that were grouped (based on the ANOVA F-value) and utilized to train and test the five ML models to classify cauliflower. The bagging classifier considering the top 09 most dominant features (based on the ANOVA F-value) have been achieved the best performance among all of our investigated classifiers. The accuracy, recall, precision, and Fl-score of the bagging classifier are 82.35%, 87.96%, 89.62% and 88.78%, respectively. Finally, it is concluded with a suggestion that appropriate features in the ML models' training and testing has significant impact on the performance of models. However, this approach can be used later to generate end to end solution which will be helpful for the farmers in real-time farming. In addition, we can employ multiclass classification approach to identify diverse diseases of cauliflowers, as well as presenting the explainability of the decision making process of the ML models. ACKNOWLEDGEMENTS This research was funded under the Centennial Research Grant (CRG), which was allocated by the Ministry of Education of the Government of the People's Republic of Bangladesh through the University Grants Commission at Sheikh Hasina University.

References

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BIOGRAPHIES OF AUTHORS

Mala Rani Barman mac was born in Dhaka, Bangladesh in 1995. She received her M.Sc. and B.Sc. degrees in Computer Science and Engineering from Jahangirnagar University in 2017 and 2016 respectively. Currently she is an assistant professor and Head of the Computer Science and Engineering Department of Sheikh Hasina University. Her research interest is in machine learning, computer vision and deep learning. She can be contacted at email: [email protected].

Al Amin Biswas received the Bachelor of Science and Master of Science degrees from the Department of Computer Science and Engineering (CSE), Jahangirnagar University, Dhaka, Bangladesh. He is currently working as a Lecturer with the CSE Department, Bangabandhu Sheikh Mujibur Rahman University (BSMRU), Kishoreganj, Bangladesh. His research interests include machine learning, deep learning, data mining, and computer vision. He has more than 35 research papers published in international conferences and journals. He has served as the Session Chair for the International Conference on Computer Communication and Informatics (ICCCI 2021). He also served as the Co-Convener for the International Conference on Machine Intelligence and Data Science Application (MIDAS 2021). He reviewed research papers for many international conferences and journals. He received the best paper award twice for his outstanding research works from two springer conferences. He can be contacted at email: [email protected].

Marjia Sultana M O O currently working as a lecturer at the department of Computer Science and Engineering of Begum Rokeya University, Rangpur, Bangladesh. She received her B.Sc. (Hons) degree in Computer Science and Engineering from Jahangirnagar University, Savar, Dhaka in 2016 and M.Sc. degree from the same university in 2018. Her research interest focuses on machine learning, deep learning, data mining, computer vision, image processing and computer networking. She has several research papers published in international conferences and journals. She can be contacted at email: [email protected].

Aditya Rajbongshi (c)hIO currently working at Bangladesh's Bangabandhu Sheikh Mujibur Rahman Digital University (BDU) as a lecturer in the Department of Educational Technology. In 2017 and 2018, he graduated with a B.Sc. and an M.Sc. from Jahangirnagar University in Dhaka, Bangladesh's Department of Computer Science and Engineering, respectively. He was employed as a lecturer at the National Institute of Textile Engineering and Research in Dhaka, Bangladesh, prior to joining BDU. His areas of interest in research are computer vision, image processing, data mining, machine learning, and deep learning. He has had over 20 research articles accepted for publication in journals and conferences worldwide. He reviewed research articles for several publications and international conferences. He can be contacted at email: [email protected].

Md. Sabab Zulflker E3 S O was born in Jamalpur, Bangladesh. He received his B.Sc. and M.Sc. degrees from the Department of Computer Science and Engineering, Jahangirnagar University, Dhaka, Bangladesh in 2016 and 2017, respectively. Currently, he is working as a lecturer in the Department of Computer Science and Engineering at Bangabandhu Sheikh Mujibur Rahman University (BSMRU), Kishoreganj, Bangladesh. Before joining BSMRU, he worked as a Senior Lecturer at Daffodil International University (DIU), Dhaka, Bangladesh. Additionally, he has hands-on experience in software development and worked as a Software Engineer at S3 Innovate Pte. Ltd. His research interests include machine learning, deep learning, data mining, natural language processing, image processing, and computer vision. He can be contacted at email: [email protected].

Tasnim Tabassum was born in Bangladesh on October 16, 1997. She received the bachelor and the master degrees in Computer Science and Engineering from Jahangirnagar University. She is currently working as a lecturer at Department of CSE, Daffodil International University. Her research interest is machine learning and computer vision. She can be contacted at email: [email protected]