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Asian Journal of Applied Science and Technology (AJAST)
(Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020
70 | P a g e Online ISSN: 2456-883X Website: www.ajast.net
Artificial Intelligence in Weed Recognition Tasks
Rakhmatulin Ildar, PhD
South Ural State University, Department of Power Plants Networks and Systems, Chelyabinsk city, Russia-454080.
Email: ildar.o2010@yandex.ru & ORCID ID- 0000-0002-3248-3153
DOI: 10.38177/ajast.2020.4210
Article Received: 21 April 2020 Article Accepted: 23 June 2020 Article Published: 30 June 2020
Competing Interests Statement
The authors declare no competing financial, professional and personal interests.
Consent for Publication
Authors declare that they consented for the publication of this research work.
1. Introduction
The use of artificial intelligence has expanded rapidly in recent years. Researchers from various fields of science
use in practice the functionality of neural networks of machine learning and machine vision. But neural networks
have very advanced functionality and variety, and if a researcher has not been directly involved in working with
neural networks over the past years, then it is very difficult for him at the initial stage to efficiently select the correct
model of a neural network. Therefore, the task of this manuscript Therefore, this manuscript provides a review that
will provide information on current trends in the field of neural networks and weed detection tasks.
We considered only completed studies in which presented the test results in neural networks and weed controls
system According to their characteristics, these devices should have been suitable for the field application. Search
for articles by keywords was carried out in the following publishers: Elsevier, Taylor & Francis, Springer, Wiley,
Informa. Keyword searches were also done on the Google search engine and scholar.google.com for the last 10
years. We tried to focus on modern research. If the results coincided, an earlier source was taken for review.
The following papers are similar in content to this manuscript. Ip et al. [1] provided an overview of significant
research in plant protection using big data with an emphasis on weed control and management. Some machine
learning methods for big data analysis were considered. Wang et al [2] presented a similar paper, where
summarized the achievements in detecting weeds using ground-based methods of machine vision and image
processing. These manuscripts describe studies without any systematic approach, according to various criteria,
ABSTRACT
Over the past decade, unprecedented progress in the development of neural networks influenced dozens of different industries, including weed
recognition in the agro-industrial sector. The use of neural networks in agro-industrial activity in the task of recognizing cultivated crops is a new
direction. The absence of any standards significantly complicates the understanding of the real situation of the use of the neural network in the
agricultural sector. The manuscript presents the complete analysis of researches over the past 10 years on the use of neural networks for the
classification and tracking of weeds due to neural networks. In particular, the analysis of the results of using various neural network algorithms for the
task of classification and tracking was presented.
As a result, we presented the recommendation for the use of neural networks in the tasks of recognizing a cultivated object and weeds. Using this
standard can significantly improve the quality of research on this topic and simplify the analysis and understanding of any paper.
Keywords: Machine vision in weed recognition, machine learning in weed recognition, weed recognition, deep learning for weed recognition.
Asian Journal of Applied Science and Technology (AJAST)
(Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020
71 | P a g e Online ISSN: 2456-883X Website: www.ajast.net
because of which it is quite difficult to imagine a complete picture of the use of neural networks in the agricultural
sector. Deep neural networks for machine vision tasks developed several years ago, and this direction was not
considered in the manuscripts described above.
Depending on weed control methods for a simple understanding, we divided considered the manuscript into several
subgroups, figure 1.
Fig.1. Classification of the manuscript on the use of neural networks in the tasks of detecting weeds
2. Materials and Methods
2.1. Weed recognition without neural networks
The task of recognizing crops and weeds already faced farmers decades earlier. As a result of which there are many
types of research that, in the context of neural networks, have now lost their former relevance, but at the same time,
due to innovative technical ideas and non-standard mathematical solutions, they carry a certain scientific value.
Nejati et al. [3], to determine weed in carrots used the active stereoscopy method based on coded structured light
with time multiplexing, designed to consider the features of a small-scale scene. This is a rather expensive method
and can only be used to compare the results with the results obtained from neural networks. In the paper [4], in
2008, in the process of identifying a weed, a fast Fourier transform was used to convert the density of the leaf edge.
This method can be implemented as an auxiliary function in the process of preparing images for neural networks.
To some extent, works may be useful that is directly not related to the subject of machine vision, but of interest, due
to the presence of physical actuators that can be used as part of devices with machine vision. Rueda-Ayala et. al [5],
Utstumo et al. [6], Alba et al [7], Melander et al. [8] and Syrov [9] Representative devices for mechanical weed
control, which can be easily connected with various systems based on neural networks.
2.2. Image preprocessing in weed recognition tasks
The quality of neural network operation directly depends on image pre-processing. Therefore, this aspect is one of
the most important in the field of machine vision. There are no direct criteria indicating how to process the image
processing since each case is unique and requires its own special method.
Panqueba et al. [10], used image segmentation function and the use of a neural network trained with sigmoid
activation function type. They implemented script that automatically processes images before they are sent to the
input of a neural network. As a result, a rather complicated computational process was used to obtain a positive
result which can significantly increase network calculation time. But Reddy et al. [11] for similar tasks managed to
With Aerial
vehicle
Without neural
networks
Image
preprocessing
With deep
learning
Companies
Methods for weed recognition
Asian Journal of Applied Science and Technology (AJAST)
(Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020
72 | P a g e Online ISSN: 2456-883X Website: www.ajast.net
achieve a positive result only with filters such as Gaussian and Laplacian. It is not possible to compare these
methods on the author's datasets since they are not presented in the public domain.
Vikhram et al. [12] and Pasha et. al [13] used cv2.inRange() function by OpenCV library in the weed tracking tasks.
This is a very simple and popular method that works with high precision in laboratory conditions. That is, in
conditions where can specifically create the necessary color contrast.
Many works in which the authors do not use popular computer vision libraries to implement the image processing
process. These works involve the implementation of image processing due to mathematical formulas based on
Matlab or other software. For example, García-Santillán et al. [14], implemented image segmentation process
based on the use of the vegetation index and linear least squares regression to correct the line. Murawwat [16] used
binary classification to prepare images before start uses neural networks. Raja et al. [18] developed software for
image processing. Software realized by the algorithm is based on erosion followed by a dilatation segmentation
algorithm.
But in these researches, verification with other methods was not carried out. To repeat the experiment, the
installation of the software is required. Moreover, these methods are extremely difficult to implement in
conjunction with neural networks. It is necessary to use a stationary computer with sufficient power for the
implementation of calculations.
Unlike these works, Murawwat et al. [15] used of machine learning procedures for the implementation of reference
vector machines (SVMs) and BLOB objects were presented.
Bhongal et al. [17] used similar standard functions and used segmentation and subsequent use of a neural network
for image processing. Ambika et al [19] and Ferreira et al. [20] focused their research on the analysis of modern
image processing methods.
A common drawback of the works described above is the lack of a complete literature review, which is why there
are many duplicating works. In such works, the process of image preprocessing is similarly described, or a similar
model of a neural network with the same neuron activation function is used. It is worth noting that the geography of
research is extensive, both in the countries of researchers and in crops and weeds. To verify recognition, the works
cite artificially designed mock-ups with a pronounced color contrast, which makes it impossible to evaluate how
these models work in practice. These works can be considered as the implementation of various methods of
machine learning and image preprocessing in practice, using concrete crops and weeds as an example.
A common feature of these works, and to a lesser degree subsequent one, is an overly detailed description of image
preprocessing, which, although it is an important component of research related to machine vision, it still does not
carry scientific novelty. At the same time, assessing the correctness of preprocessing in the described works is a
difficult task, since each case is unique and depends on the tasks and the number of photos submitted for
processing.
According to the analysis, we can conclude that for the most part, not all the possible functionality for
preprocessing images used, for example, that can be used in the OpenCV library. The following is a list that is
Asian Journal of Applied Science and Technology (AJAST)
(Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020
73 | P a g e Online ISSN: 2456-883X Website: www.ajast.net
useful for preprocessing images. In parentheses are the operators used to call an object in the python programming
language in the OpenCV library.
Image preprocessing:
- Color
 цветовые фильтры (cv2.createTrackbar, cv2.cghhnbnmlootroiesxxxvtColor, color_image[:,:,n])
 color detection (cv2.inRange, cv2.findContours);
- Smoothing Images
 Convolution (cv2.filter2D);
 Image Blurring (cv2.blur);
 Gaussian Filtering (cv2.GaussianBlur);
 Median Filtering (cv2.medianBlur);
 Bilateral Filtering (cv2.bilateralFilter);
 Laplacian (cv2.Laplacian).
- Morphological Transformations
 Erosion (cv2.erode);
 Dilation (cv2.dilate);
 Opening (cv2.MORPH_OPEN);
 Closing (cv2.MORPH_CLOSE);
 Morphological Gradient (cv2.MORPH_GRADIENT);
 Top Hat (cv2.MORPH_OPEN);
 Black Hat (cv2.MORPH_BLACKHAT).
 Edge Detection (cv2.Canny).
Contours
 Контуры (cv.drawContours);
 Фигуры (cv2.rectangle, cv2.minEnclosingCircle, cv2.circle, cv2.line);
 Заливка (cv2.floodFill).
Thresholding
 Binary (cv2.THRESH_BINARY);
 Binary_inv (cv2.THRESH_BINARY_INV);
 Trunc (cv2.THRESH_TRUNC);
 Tozero (cv2.THRESH_TOZERO);
 Tozero_inv (cv2.THRESH_TOZERO_INV).
Geometrical image transformation
 Resize (cv2.resize);
Asian Journal of Applied Science and Technology (AJAST)
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 Translation cv2.warpAffine();
 Rotation (cv2.getRotationMatrix2D);
 Affine Transformation (cv2.getAffineTransform);
 Perspective Transformation (cv2.getPerspectiveTransform, cv2.warpPerspectiv).
Image Derivatives
 Sobel derivatives (cv2.Sobel);
 Scharr derivatives (cv2.Scharr).
Using these functions will allow you to evaluate and understand what elements in the image may be helpful for
weed recognition. For example, in figure 2, we realized the most popular functions for the image recognition
process (https://github.com/Ildaron/OpenCV-image-preprocessing-python). The separation of the plant on the
leading edge from the background presents certain difficulties. The solution is to select the correct method and
select the correct coefficients of threshold function.
a b c d e f g
h j k l m n p
Fig.2. Feature extraction: a - received image with weed and tomato, b - image thresholding by
cv2.threshold(img,127,155,cv2.THRESH_BINARY), c - image thresholding by
cv2.threshold(img,127,155,cv2.THRESH_BINARY_INV), d - image thresholding by
cv2.threshold(img,127,155,cv2.THRESH_TOZERO), e - image thresholding by
cv2.threshold(img,127,155,cv2.THRESH_TOZERO_INV), f - morphological transformations by cv2.morphologyEx(img,
cv2.MORPH_BLACKHAT, kernel1), g - morphological transformations by cv2.morphologyEx(img, cv2.MORPH_OPEN,
kernel2), h - morphological transformations by cv2.morphologyEx(img, cv2.MORPH_CLOSE, kernel2), j - morphological
transformations by cv2.morphologyEx(img, cv2.MORPH_GRADIENT, kernel2), k -flood fill by cv2.floodFill(im_floodfill,
mask, (0, 0), 255), l - segmentation by cv2.kmeans(pixel_values, k, None, criteria, 10,
Asian Journal of Applied Science and Technology (AJAST)
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cv2.KMEANS_RANDOM_CENTERS), m - distance transform by cv2.distanceTransform(opening,cv2.DIST_L2,5), n -
color detection by cv2.inRange(hsv, h_min, h_max) – from
2.3. Deep learning in weed recognition tasks
In recent years, deep learning in connection with the availability of computing power began to be widely used in
machine vision problems. Today, the use of deep machine learning is a priority in the problems of classification and
tracking, which is confirmed by the results of competitions at Kaggle and Image.net. The most popular neural
network used in classification tasks is the convolutional neural network (CNN). In the manuscripts, the authors use
various models of neural networks for the classification of weeds and crop tasks. As is correct, to confirm the
effectiveness of the proposed methods, the authors give comparisons of the proposed model with other models of
neural networks. But each author decides on the success of the proposed method in the manuscript himself without
any standards. For example the next papers used different models of neural networks for weed recognition tasks.
Bah et al. [32] considered both the CNN network and the residual CNN for image classification. Priya et al. [33]
created the deep neural network using the Keras library. Potena et al. [34] used the CNN neural network for pixel
segmentation of a binary image, for extracting pixels and constructing a projection of three-dimensional points.
Ahmed et al [35], created the network is based on VGG16 and discussed in detail the principles of deep learning
and presents the results of experiments and tests. Sharma et al. [36] considered residual network 101. The network
parameters adjusted using a method with progressive resizing, with the speed of cyclic learning and the function of
focus loss. Zhang et al. [37] made a detailed comparison of VGG and CCD networks for finding weed.
Extremely rare that the same type of weed appears in research that makes it impossible to directly compare several
manuscripts. In the works described above, there is not enough argumentation on the choice of models, and the
criteria for success are very arbitrary. It can be concluded that, from a practical point of view, these studies are
relevant, but do not bring any significant scientific achievements.
2.4. Unmanned aerial vehicle for weed recognition tasks
The most promising direction in the use of neural networks in the weed recognition tasks is the possibility of using
a small computer system with machine vision function as part of an unmanned aerial vehicle. A few studies
describe the implementation process of using an unmanned aerial vehicle for weed control. Since in this case, the
quality of the photo/video is limited, due to the unstable position of the aircraft - preprocessing of images is
especially important. Huang et al. [38] used the full convolution network (FCN) method to recognize weeds from
images collected by the apparatus. Hameed et al. [39], used the aircraft to collect information about the crop, where
to classify the structures, a technique was used to train the matrix of coincidences of the gray NN level with Haralix
descriptors. Many types of research described a method with a general analysis of productivity without accurate
recognition of the crop [40, 41].
Today there are no unmanned aerial vehicles that could overcome the difficulties with recognizing crops on the
scale of an agricultural farm and, so far, are usually used to present a general picture of the crop on the field.
Asian Journal of Applied Science and Technology (AJAST)
(Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020
76 | P a g e Online ISSN: 2456-883X Website: www.ajast.net
A promising area for research in this industry is the use of a single-board computer - Raspberry pi with the aerial
vehicles. But today into account that using the deep learning methods on the Raspberry Pi due to the limited RAM
on the Raspberry Pi 3 (1 GB) and even the maximum configuration of the Raspberry Pi 4 (4 GB) and due to the low
processor speed of 1.5 GG is almost impossible ( ResNet> 100 MB, VGGNet> 550 MB, AlexNet> 200 MB,
GoogLeNet> 30 MB). Real-time detection with R-CNN, Fast R-CNN, Faster R-CNN, Yolo, RetinaNet has the
same recognition speed problem. The solution could be to use - NVIDIA Jetson TX1 and TX2 - a special platform
for computing neural networks. The main disadvantage, which is the high cost. Company STMicroelectronics has
made it possible to use deep learning methods on microcontrollers. They released X-CUBE-AI - AI has an
expansion pack for STM32CubeMX. This extension can work with various deep learning environments such as
Caffe, Keras, TensorFlow, Caffe, ConvNetJs, etc. Thanks to this, the neural network can be trained on a desktop
computer with the ability to calculate on a GPU. After integration, use the optimized library for the 32-bit STM32
microcontroller. At the same time, using a microcontroller instead of a single-board computer will significantly
reduce power consumption by several watts. Therefore, the use of neural networks as part of an unmanned aerial
vehicle has good prospects
2.5. Development сcompanies in weed recognition tasks
Several companies provide services for the sale of autonomous robots for spot weeding agricultural. lan.
Naio-technologies introduced a robot - OZ WEEDING ROBOT. Bilberry Company are developing tracking
systems that can be installed on agricultural machinery for subsequent weed monitoring. Precisionb Hawk’s is
developing autonomous aircraft with weed identification systems. Blue River Technology Company displays
information on the website on developments in the use of neural networks in agricultural Ecorobotix introduced
WEEDING ROBOT. Carre developed the ANATIS robot.
All the companies described above, for the developed technologies, did not provide documentation, the
experimental data on which could be used to judge the results of the operation of the devices. At best, companies
limited themselves to fragments of a video demonstration of devices. Agro-market is becoming a very popular
destination for startups. This is confirmed by the information about large financial investments in various
companies engaged in IT development for agricultural enterprises. Working prototypes could not be found. The
research results of startups, due to objective reasons, are even more closed than the companies described in the
earlier chapter, which is why they are not considered in this study.
2.6. Other research in weed recognition tasks
Very popular manuscripts that presented a prototype robotic complex for automatically remove weeds in the fields.
For example, Sabanci et al. [21], Young et al. [22], Frasconi et al. [23], Kulkarni et al. [24], Bakhshipour et al. [25],
Kargar et al. [26], Potena et al. [27] and Slaughter et al. [28] presented various neural networks for diagnosing
weeds and mechanisms to remove weeds. The disadvantage of these works is too much information coverage -
mechanics, electronics, neural networks, and robotics. As a result, these works briefly describe implementation of
neural networks. Unlike these articles with robotic systems thesis describe as much as possible every aspect of the
research. Ospina [29] In the thesis described the development process for smart agricultural vehicle. Ospina used
Asian Journal of Applied Science and Technology (AJAST)
(Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020
77 | P a g e Online ISSN: 2456-883X Website: www.ajast.net
machine vision data as a bifocal imaging device that operates in 2 modes - simultaneous shooting of a wide-angle
image and approximate shooting with a telephoto lens. To analyze the presence of weed from a telephoto lens,
high-resolution photographs were obtained, and a wide-angle camera allowed increasing the monitoring area.
Result with high accuracy obtained in terms of searching for weeds in the field from the camera mounted on the
vehicle. But, due to its high price of the camera system of this format is more suitable for research than for
subsequent work on the field.
Dyrmann [30] In the thesis - "Automatic detection and classification of weed seedlings in natural light", showed in
detail image transformation between layer neural models, figure 3. The work uses standard methods of image
preprocessing and a convolutional neural network.
Fig.3. CNN Model Demonstration
In contrast to this thesis, Alba [31] used not the most popular algorithm based on the Fuzzy C-means method for
classification problems. In the thesis researched Real-time computer vision technique for robust plant seedling
tracking in the field environment. Various segmentation methods were considered.
3. Discussion and conclusions
The review showed a wide variety type of neural networks used in the process of weed recognition, where leading
positions were taken by the different implementation of convolutional neural network networks.
Fig.4. Neural networks recommended for image classification in plant recognition
Deep learning
classification
ResNet ZFNet
SegNet VGG AlexNet GoogLeNet
Asian Journal of Applied Science and Technology (AJAST)
(Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020
78 | P a g e Online ISSN: 2456-883X Website: www.ajast.net
Based on an analysis of the articles described earlier and the results of Kaggle and Imagenet contests, the following
is a recommended list of deep neural networks for classifying images. These models are advisable to use in the
weed classification tasks, figure 4. For weed recognition in video-stream recommended the next models, figure 5.
Fig.5. The neural networks that are appropriate to use in the tracking process of weed
The difficulty in building neural networks is that when choosing a model, many parameters depend on the task, the
amount of input data, the availability of time and computing power, which makes each work unique. In view of this,
it is impossible to correctly model the network initially, but it is necessary to use as many mechanisms as possible
in pre-processing and consider a larger number of networks.
A common drawback of all research work is the lack of a full-fledged long-term verification of the neural network
in the field with weeds. In the works for verification, the conditions are artificially modeled to obtain a clear image
with the plant and weed, which initially simplifies the work for the neural network. The date used for training and
testing in open access is not provided, which makes it impossible to analyze the model.
In recognition of weed on the field, two main points can be distinguished. The first is the recognition complexity,
which is dictated by weather conditions, the presence of all kinds of options for the various physical locations of
weed. The second is the recognition speed and the number of possible objects for detection. In the research
described earlier, no links were made to the Kaggle website, which is the best place to analyze the performance of
the developed models of the wide network.
Competitions will help to give a real picture of the assessment of machine learning models that are purposefully
used in the process of object recognition. Also, research does not come up with links to image.net. In this case, the
speed of recognition of objects is not disclosed in the works. In order to increase the recognition speed and increase
the number of tracking objects, in addition to increasing the computer power, it is necessary to apply non-typical
actions like using two GPUs in the stereo vision algorithm or using several GPUs in the detection algorithm.
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(Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020
81 | P a g e Online ISSN: 2456-883X Website: www.ajast.net
35. Ahmed, F. (2019). Machine Learning for Crop and Weed Classification. Performance Analysis of Support
Vector Machine and Bayesian Classifier for Crop and Weed Classification from Digital Images. World Applied
Sciences Journal, 12(4), 432-440
36. Sharma, P. (2019). Crops and weeds classification using Convolutional Neural Networks via optimization of
transfer learning parameters. International Journal of Engineering and Advanced Technology (IJEAT) ISSN:
2249-8958, 8, Issue-5, 2285-2294
37. Zhang, W. (2018). Broad-leaf weed detection in pasture. IEEE 3rd
International Conference on Image, Vision
and Computing, 15-23
38. Huang, H. (2016). A fully convolutional network for weed mapping of unmanned aerial vehicle (UAV)
imagery Huasheng. PLoS ONE, 450-470
39. Hameed, S. (2018). Detection of Weed and Wheat Using Image Processing. Conference: 2018 IEEE 5th
International Conference on Engineering Technologies and Applied Sciences (ICETAS), 34-39
40. Wang, S., & Liu, H. (2018). Low-Altitude Remote Sensing Based on Convolutional Neural Network for Weed
Classification in Ecological Irrigation Area. IFAC-PapersOnLine, 51, Issue 17, 298-303
41. Huang, Y. (2019). UAV Low-Altitude Remote Sensing for Precision Weed Management. Weed Technology,
32, 1-5

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Artificial Intelligence in Weed Recognition Tasks

  • 1. Asian Journal of Applied Science and Technology (AJAST) (Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020 70 | P a g e Online ISSN: 2456-883X Website: www.ajast.net Artificial Intelligence in Weed Recognition Tasks Rakhmatulin Ildar, PhD South Ural State University, Department of Power Plants Networks and Systems, Chelyabinsk city, Russia-454080. Email: ildar.o2010@yandex.ru & ORCID ID- 0000-0002-3248-3153 DOI: 10.38177/ajast.2020.4210 Article Received: 21 April 2020 Article Accepted: 23 June 2020 Article Published: 30 June 2020 Competing Interests Statement The authors declare no competing financial, professional and personal interests. Consent for Publication Authors declare that they consented for the publication of this research work. 1. Introduction The use of artificial intelligence has expanded rapidly in recent years. Researchers from various fields of science use in practice the functionality of neural networks of machine learning and machine vision. But neural networks have very advanced functionality and variety, and if a researcher has not been directly involved in working with neural networks over the past years, then it is very difficult for him at the initial stage to efficiently select the correct model of a neural network. Therefore, the task of this manuscript Therefore, this manuscript provides a review that will provide information on current trends in the field of neural networks and weed detection tasks. We considered only completed studies in which presented the test results in neural networks and weed controls system According to their characteristics, these devices should have been suitable for the field application. Search for articles by keywords was carried out in the following publishers: Elsevier, Taylor & Francis, Springer, Wiley, Informa. Keyword searches were also done on the Google search engine and scholar.google.com for the last 10 years. We tried to focus on modern research. If the results coincided, an earlier source was taken for review. The following papers are similar in content to this manuscript. Ip et al. [1] provided an overview of significant research in plant protection using big data with an emphasis on weed control and management. Some machine learning methods for big data analysis were considered. Wang et al [2] presented a similar paper, where summarized the achievements in detecting weeds using ground-based methods of machine vision and image processing. These manuscripts describe studies without any systematic approach, according to various criteria, ABSTRACT Over the past decade, unprecedented progress in the development of neural networks influenced dozens of different industries, including weed recognition in the agro-industrial sector. The use of neural networks in agro-industrial activity in the task of recognizing cultivated crops is a new direction. The absence of any standards significantly complicates the understanding of the real situation of the use of the neural network in the agricultural sector. The manuscript presents the complete analysis of researches over the past 10 years on the use of neural networks for the classification and tracking of weeds due to neural networks. In particular, the analysis of the results of using various neural network algorithms for the task of classification and tracking was presented. As a result, we presented the recommendation for the use of neural networks in the tasks of recognizing a cultivated object and weeds. Using this standard can significantly improve the quality of research on this topic and simplify the analysis and understanding of any paper. Keywords: Machine vision in weed recognition, machine learning in weed recognition, weed recognition, deep learning for weed recognition.
  • 2. Asian Journal of Applied Science and Technology (AJAST) (Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020 71 | P a g e Online ISSN: 2456-883X Website: www.ajast.net because of which it is quite difficult to imagine a complete picture of the use of neural networks in the agricultural sector. Deep neural networks for machine vision tasks developed several years ago, and this direction was not considered in the manuscripts described above. Depending on weed control methods for a simple understanding, we divided considered the manuscript into several subgroups, figure 1. Fig.1. Classification of the manuscript on the use of neural networks in the tasks of detecting weeds 2. Materials and Methods 2.1. Weed recognition without neural networks The task of recognizing crops and weeds already faced farmers decades earlier. As a result of which there are many types of research that, in the context of neural networks, have now lost their former relevance, but at the same time, due to innovative technical ideas and non-standard mathematical solutions, they carry a certain scientific value. Nejati et al. [3], to determine weed in carrots used the active stereoscopy method based on coded structured light with time multiplexing, designed to consider the features of a small-scale scene. This is a rather expensive method and can only be used to compare the results with the results obtained from neural networks. In the paper [4], in 2008, in the process of identifying a weed, a fast Fourier transform was used to convert the density of the leaf edge. This method can be implemented as an auxiliary function in the process of preparing images for neural networks. To some extent, works may be useful that is directly not related to the subject of machine vision, but of interest, due to the presence of physical actuators that can be used as part of devices with machine vision. Rueda-Ayala et. al [5], Utstumo et al. [6], Alba et al [7], Melander et al. [8] and Syrov [9] Representative devices for mechanical weed control, which can be easily connected with various systems based on neural networks. 2.2. Image preprocessing in weed recognition tasks The quality of neural network operation directly depends on image pre-processing. Therefore, this aspect is one of the most important in the field of machine vision. There are no direct criteria indicating how to process the image processing since each case is unique and requires its own special method. Panqueba et al. [10], used image segmentation function and the use of a neural network trained with sigmoid activation function type. They implemented script that automatically processes images before they are sent to the input of a neural network. As a result, a rather complicated computational process was used to obtain a positive result which can significantly increase network calculation time. But Reddy et al. [11] for similar tasks managed to With Aerial vehicle Without neural networks Image preprocessing With deep learning Companies Methods for weed recognition
  • 3. Asian Journal of Applied Science and Technology (AJAST) (Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020 72 | P a g e Online ISSN: 2456-883X Website: www.ajast.net achieve a positive result only with filters such as Gaussian and Laplacian. It is not possible to compare these methods on the author's datasets since they are not presented in the public domain. Vikhram et al. [12] and Pasha et. al [13] used cv2.inRange() function by OpenCV library in the weed tracking tasks. This is a very simple and popular method that works with high precision in laboratory conditions. That is, in conditions where can specifically create the necessary color contrast. Many works in which the authors do not use popular computer vision libraries to implement the image processing process. These works involve the implementation of image processing due to mathematical formulas based on Matlab or other software. For example, García-Santillán et al. [14], implemented image segmentation process based on the use of the vegetation index and linear least squares regression to correct the line. Murawwat [16] used binary classification to prepare images before start uses neural networks. Raja et al. [18] developed software for image processing. Software realized by the algorithm is based on erosion followed by a dilatation segmentation algorithm. But in these researches, verification with other methods was not carried out. To repeat the experiment, the installation of the software is required. Moreover, these methods are extremely difficult to implement in conjunction with neural networks. It is necessary to use a stationary computer with sufficient power for the implementation of calculations. Unlike these works, Murawwat et al. [15] used of machine learning procedures for the implementation of reference vector machines (SVMs) and BLOB objects were presented. Bhongal et al. [17] used similar standard functions and used segmentation and subsequent use of a neural network for image processing. Ambika et al [19] and Ferreira et al. [20] focused their research on the analysis of modern image processing methods. A common drawback of the works described above is the lack of a complete literature review, which is why there are many duplicating works. In such works, the process of image preprocessing is similarly described, or a similar model of a neural network with the same neuron activation function is used. It is worth noting that the geography of research is extensive, both in the countries of researchers and in crops and weeds. To verify recognition, the works cite artificially designed mock-ups with a pronounced color contrast, which makes it impossible to evaluate how these models work in practice. These works can be considered as the implementation of various methods of machine learning and image preprocessing in practice, using concrete crops and weeds as an example. A common feature of these works, and to a lesser degree subsequent one, is an overly detailed description of image preprocessing, which, although it is an important component of research related to machine vision, it still does not carry scientific novelty. At the same time, assessing the correctness of preprocessing in the described works is a difficult task, since each case is unique and depends on the tasks and the number of photos submitted for processing. According to the analysis, we can conclude that for the most part, not all the possible functionality for preprocessing images used, for example, that can be used in the OpenCV library. The following is a list that is
  • 4. Asian Journal of Applied Science and Technology (AJAST) (Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020 73 | P a g e Online ISSN: 2456-883X Website: www.ajast.net useful for preprocessing images. In parentheses are the operators used to call an object in the python programming language in the OpenCV library. Image preprocessing: - Color  цветовые фильтры (cv2.createTrackbar, cv2.cghhnbnmlootroiesxxxvtColor, color_image[:,:,n])  color detection (cv2.inRange, cv2.findContours); - Smoothing Images  Convolution (cv2.filter2D);  Image Blurring (cv2.blur);  Gaussian Filtering (cv2.GaussianBlur);  Median Filtering (cv2.medianBlur);  Bilateral Filtering (cv2.bilateralFilter);  Laplacian (cv2.Laplacian). - Morphological Transformations  Erosion (cv2.erode);  Dilation (cv2.dilate);  Opening (cv2.MORPH_OPEN);  Closing (cv2.MORPH_CLOSE);  Morphological Gradient (cv2.MORPH_GRADIENT);  Top Hat (cv2.MORPH_OPEN);  Black Hat (cv2.MORPH_BLACKHAT).  Edge Detection (cv2.Canny). Contours  Контуры (cv.drawContours);  Фигуры (cv2.rectangle, cv2.minEnclosingCircle, cv2.circle, cv2.line);  Заливка (cv2.floodFill). Thresholding  Binary (cv2.THRESH_BINARY);  Binary_inv (cv2.THRESH_BINARY_INV);  Trunc (cv2.THRESH_TRUNC);  Tozero (cv2.THRESH_TOZERO);  Tozero_inv (cv2.THRESH_TOZERO_INV). Geometrical image transformation  Resize (cv2.resize);
  • 5. Asian Journal of Applied Science and Technology (AJAST) (Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020 74 | P a g e Online ISSN: 2456-883X Website: www.ajast.net  Translation cv2.warpAffine();  Rotation (cv2.getRotationMatrix2D);  Affine Transformation (cv2.getAffineTransform);  Perspective Transformation (cv2.getPerspectiveTransform, cv2.warpPerspectiv). Image Derivatives  Sobel derivatives (cv2.Sobel);  Scharr derivatives (cv2.Scharr). Using these functions will allow you to evaluate and understand what elements in the image may be helpful for weed recognition. For example, in figure 2, we realized the most popular functions for the image recognition process (https://github.com/Ildaron/OpenCV-image-preprocessing-python). The separation of the plant on the leading edge from the background presents certain difficulties. The solution is to select the correct method and select the correct coefficients of threshold function. a b c d e f g h j k l m n p Fig.2. Feature extraction: a - received image with weed and tomato, b - image thresholding by cv2.threshold(img,127,155,cv2.THRESH_BINARY), c - image thresholding by cv2.threshold(img,127,155,cv2.THRESH_BINARY_INV), d - image thresholding by cv2.threshold(img,127,155,cv2.THRESH_TOZERO), e - image thresholding by cv2.threshold(img,127,155,cv2.THRESH_TOZERO_INV), f - morphological transformations by cv2.morphologyEx(img, cv2.MORPH_BLACKHAT, kernel1), g - morphological transformations by cv2.morphologyEx(img, cv2.MORPH_OPEN, kernel2), h - morphological transformations by cv2.morphologyEx(img, cv2.MORPH_CLOSE, kernel2), j - morphological transformations by cv2.morphologyEx(img, cv2.MORPH_GRADIENT, kernel2), k -flood fill by cv2.floodFill(im_floodfill, mask, (0, 0), 255), l - segmentation by cv2.kmeans(pixel_values, k, None, criteria, 10,
  • 6. Asian Journal of Applied Science and Technology (AJAST) (Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020 75 | P a g e Online ISSN: 2456-883X Website: www.ajast.net cv2.KMEANS_RANDOM_CENTERS), m - distance transform by cv2.distanceTransform(opening,cv2.DIST_L2,5), n - color detection by cv2.inRange(hsv, h_min, h_max) – from 2.3. Deep learning in weed recognition tasks In recent years, deep learning in connection with the availability of computing power began to be widely used in machine vision problems. Today, the use of deep machine learning is a priority in the problems of classification and tracking, which is confirmed by the results of competitions at Kaggle and Image.net. The most popular neural network used in classification tasks is the convolutional neural network (CNN). In the manuscripts, the authors use various models of neural networks for the classification of weeds and crop tasks. As is correct, to confirm the effectiveness of the proposed methods, the authors give comparisons of the proposed model with other models of neural networks. But each author decides on the success of the proposed method in the manuscript himself without any standards. For example the next papers used different models of neural networks for weed recognition tasks. Bah et al. [32] considered both the CNN network and the residual CNN for image classification. Priya et al. [33] created the deep neural network using the Keras library. Potena et al. [34] used the CNN neural network for pixel segmentation of a binary image, for extracting pixels and constructing a projection of three-dimensional points. Ahmed et al [35], created the network is based on VGG16 and discussed in detail the principles of deep learning and presents the results of experiments and tests. Sharma et al. [36] considered residual network 101. The network parameters adjusted using a method with progressive resizing, with the speed of cyclic learning and the function of focus loss. Zhang et al. [37] made a detailed comparison of VGG and CCD networks for finding weed. Extremely rare that the same type of weed appears in research that makes it impossible to directly compare several manuscripts. In the works described above, there is not enough argumentation on the choice of models, and the criteria for success are very arbitrary. It can be concluded that, from a practical point of view, these studies are relevant, but do not bring any significant scientific achievements. 2.4. Unmanned aerial vehicle for weed recognition tasks The most promising direction in the use of neural networks in the weed recognition tasks is the possibility of using a small computer system with machine vision function as part of an unmanned aerial vehicle. A few studies describe the implementation process of using an unmanned aerial vehicle for weed control. Since in this case, the quality of the photo/video is limited, due to the unstable position of the aircraft - preprocessing of images is especially important. Huang et al. [38] used the full convolution network (FCN) method to recognize weeds from images collected by the apparatus. Hameed et al. [39], used the aircraft to collect information about the crop, where to classify the structures, a technique was used to train the matrix of coincidences of the gray NN level with Haralix descriptors. Many types of research described a method with a general analysis of productivity without accurate recognition of the crop [40, 41]. Today there are no unmanned aerial vehicles that could overcome the difficulties with recognizing crops on the scale of an agricultural farm and, so far, are usually used to present a general picture of the crop on the field.
  • 7. Asian Journal of Applied Science and Technology (AJAST) (Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020 76 | P a g e Online ISSN: 2456-883X Website: www.ajast.net A promising area for research in this industry is the use of a single-board computer - Raspberry pi with the aerial vehicles. But today into account that using the deep learning methods on the Raspberry Pi due to the limited RAM on the Raspberry Pi 3 (1 GB) and even the maximum configuration of the Raspberry Pi 4 (4 GB) and due to the low processor speed of 1.5 GG is almost impossible ( ResNet> 100 MB, VGGNet> 550 MB, AlexNet> 200 MB, GoogLeNet> 30 MB). Real-time detection with R-CNN, Fast R-CNN, Faster R-CNN, Yolo, RetinaNet has the same recognition speed problem. The solution could be to use - NVIDIA Jetson TX1 and TX2 - a special platform for computing neural networks. The main disadvantage, which is the high cost. Company STMicroelectronics has made it possible to use deep learning methods on microcontrollers. They released X-CUBE-AI - AI has an expansion pack for STM32CubeMX. This extension can work with various deep learning environments such as Caffe, Keras, TensorFlow, Caffe, ConvNetJs, etc. Thanks to this, the neural network can be trained on a desktop computer with the ability to calculate on a GPU. After integration, use the optimized library for the 32-bit STM32 microcontroller. At the same time, using a microcontroller instead of a single-board computer will significantly reduce power consumption by several watts. Therefore, the use of neural networks as part of an unmanned aerial vehicle has good prospects 2.5. Development сcompanies in weed recognition tasks Several companies provide services for the sale of autonomous robots for spot weeding agricultural. lan. Naio-technologies introduced a robot - OZ WEEDING ROBOT. Bilberry Company are developing tracking systems that can be installed on agricultural machinery for subsequent weed monitoring. Precisionb Hawk’s is developing autonomous aircraft with weed identification systems. Blue River Technology Company displays information on the website on developments in the use of neural networks in agricultural Ecorobotix introduced WEEDING ROBOT. Carre developed the ANATIS robot. All the companies described above, for the developed technologies, did not provide documentation, the experimental data on which could be used to judge the results of the operation of the devices. At best, companies limited themselves to fragments of a video demonstration of devices. Agro-market is becoming a very popular destination for startups. This is confirmed by the information about large financial investments in various companies engaged in IT development for agricultural enterprises. Working prototypes could not be found. The research results of startups, due to objective reasons, are even more closed than the companies described in the earlier chapter, which is why they are not considered in this study. 2.6. Other research in weed recognition tasks Very popular manuscripts that presented a prototype robotic complex for automatically remove weeds in the fields. For example, Sabanci et al. [21], Young et al. [22], Frasconi et al. [23], Kulkarni et al. [24], Bakhshipour et al. [25], Kargar et al. [26], Potena et al. [27] and Slaughter et al. [28] presented various neural networks for diagnosing weeds and mechanisms to remove weeds. The disadvantage of these works is too much information coverage - mechanics, electronics, neural networks, and robotics. As a result, these works briefly describe implementation of neural networks. Unlike these articles with robotic systems thesis describe as much as possible every aspect of the research. Ospina [29] In the thesis described the development process for smart agricultural vehicle. Ospina used
  • 8. Asian Journal of Applied Science and Technology (AJAST) (Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020 77 | P a g e Online ISSN: 2456-883X Website: www.ajast.net machine vision data as a bifocal imaging device that operates in 2 modes - simultaneous shooting of a wide-angle image and approximate shooting with a telephoto lens. To analyze the presence of weed from a telephoto lens, high-resolution photographs were obtained, and a wide-angle camera allowed increasing the monitoring area. Result with high accuracy obtained in terms of searching for weeds in the field from the camera mounted on the vehicle. But, due to its high price of the camera system of this format is more suitable for research than for subsequent work on the field. Dyrmann [30] In the thesis - "Automatic detection and classification of weed seedlings in natural light", showed in detail image transformation between layer neural models, figure 3. The work uses standard methods of image preprocessing and a convolutional neural network. Fig.3. CNN Model Demonstration In contrast to this thesis, Alba [31] used not the most popular algorithm based on the Fuzzy C-means method for classification problems. In the thesis researched Real-time computer vision technique for robust plant seedling tracking in the field environment. Various segmentation methods were considered. 3. Discussion and conclusions The review showed a wide variety type of neural networks used in the process of weed recognition, where leading positions were taken by the different implementation of convolutional neural network networks. Fig.4. Neural networks recommended for image classification in plant recognition Deep learning classification ResNet ZFNet SegNet VGG AlexNet GoogLeNet
  • 9. Asian Journal of Applied Science and Technology (AJAST) (Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020 78 | P a g e Online ISSN: 2456-883X Website: www.ajast.net Based on an analysis of the articles described earlier and the results of Kaggle and Imagenet contests, the following is a recommended list of deep neural networks for classifying images. These models are advisable to use in the weed classification tasks, figure 4. For weed recognition in video-stream recommended the next models, figure 5. Fig.5. The neural networks that are appropriate to use in the tracking process of weed The difficulty in building neural networks is that when choosing a model, many parameters depend on the task, the amount of input data, the availability of time and computing power, which makes each work unique. In view of this, it is impossible to correctly model the network initially, but it is necessary to use as many mechanisms as possible in pre-processing and consider a larger number of networks. A common drawback of all research work is the lack of a full-fledged long-term verification of the neural network in the field with weeds. In the works for verification, the conditions are artificially modeled to obtain a clear image with the plant and weed, which initially simplifies the work for the neural network. The date used for training and testing in open access is not provided, which makes it impossible to analyze the model. In recognition of weed on the field, two main points can be distinguished. The first is the recognition complexity, which is dictated by weather conditions, the presence of all kinds of options for the various physical locations of weed. The second is the recognition speed and the number of possible objects for detection. In the research described earlier, no links were made to the Kaggle website, which is the best place to analyze the performance of the developed models of the wide network. Competitions will help to give a real picture of the assessment of machine learning models that are purposefully used in the process of object recognition. Also, research does not come up with links to image.net. In this case, the speed of recognition of objects is not disclosed in the works. In order to increase the recognition speed and increase the number of tracking objects, in addition to increasing the computer power, it is necessary to apply non-typical actions like using two GPUs in the stereo vision algorithm or using several GPUs in the detection algorithm. References 1. Ip, P., & Ang, L. (2018). Big data and machine learning for crop protection. Computers and Electronics in Agriculture, 151, 376-383. 2. Wang, A., Ang, W., & Seng, K. (2019). A review on weed detection using ground-based machine vision and image processing techniques. Computers and Electronics in Agriculture, 158, 226-240 Deep learning Tracking Desnet Fast R-CNN Faster R-CNN YoloV3 R-FCN CCD RetinaNet
  • 10. Asian Journal of Applied Science and Technology (AJAST) (Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020 79 | P a g e Online ISSN: 2456-883X Website: www.ajast.net 3. Nejati, H., Azimifar, Z., & Destain, M. (2011). Weed detection in 3D images. Precision Agriculture 12(5), 607-622 4. Nejati, H., Azimifar, Z., & Zamani, M. (2008). Using Fast Fourier Transform for Weed Detection in Corn Fields. IEEE International Conference on Systems, Man and Cybernetics, 1215-1219 5. Rueda-Ayala, V., Gerhards, R., & Rasmussen, J. (2010). Mechanical weed control. Precision Crop Protection - the Challenge and Use of Heterogeneity, 45, 279-294 6. Utstumo, T. (2018). Robotic in-row weed control in vegetables. Computers and Electronics in Agriculture, 154, 36-45 7. Alba, O., Syrov, L., & Shirtliffe, S. (2019). Increased seeding rate and multiple methods of mechanical weed control reduce weed biomass in a poorly competitive organic crop. Field Crops Research,6, 245 8. Melander, B., Lattanzi, B., & Pannacci, E. (2015). Intelligent versus non-intelligent mechanical intra-row weed control in transplanted onion and cabbage. Crop Protection, 72, 1-8 9. Syrov, L. (2016). Effects of mechanical weed control or cover crop on the growth and economic viability of two short-rotation willow cultivars. Biomass and Bioenergy, 91, 296-305 10. Panqueba, B., & Medina, C. (2016). A computer vision application to detect unwanted weed in early stage crops, 4, 41-45 11. Reddy , R., Laasya,G. and Basha, M., 2017. Image Processing for Weed Detection, 5, Issue 4, 485-489 12. Vikhram, G., Agarwal, R., & Prasanth, V. (2018). Automatic Weed Detection and Smart Herbicide Sprayer Robot. International Journal of Engineering & Technology, 7, 115-118 13. Pasha, I., Reddy, A., & Mahima, P. (2018). Design of a weed detection system for cotton field. International Journal of Pure and Applied Mathematics, 118, 1314-3395 14. García-Santillán, I., & Guerrero, J. (2018). Curved and straight crop row detection by accumulation of green pixels from images in maize fields. Precision Agriculture, 19, Issue 1, 18–41 15. Murawwat, S. (2018). Weed Detection Using SVMs. Engineering, Technology & Applied Science Research, 8, 2412-2416 i - as a i isi s s w i si i a i i i a s ssa is a a a i a -360 17. Bhongal, K., & Gore,S. (2017). Using image processing techniques and smart herbicide sprayer robot, 7, 10-16 18. Raja, R., & Slaughter, D. (2019). Crop signalling: A novel crop recognition technique for robotic weed control. Biosystems Engineering, 187, 278-291 19. Ambika, N., & Supriya, P. (2018). Detection of Vanilla Species by Employing Image Processing Approach. Procedia Computer Science, 143, 474-480
  • 11. Asian Journal of Applied Science and Technology (AJAST) (Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020 80 | P a g e Online ISSN: 2456-883X Website: www.ajast.net 20. Ferreira, A., Freitas, D., Silva, G., Pistorib, H., & Folhesc, M. (2017). Weed detection in soybean crops using ConvNets. Computers and Electronics in Agriculture, 143, 314-324 21. Sabanci, K., & Aydin,C. (2016). Smart Robotic Weed Control System for Sugar Beet. J. Agr. Sci. Tech, 19, 73-83 22. Young, S. (2018). Future Directions for Automated Weed Management in Precision Agriculture. , Automation: The Future of Weed Control in Cropping Systems, 6, 249–259 23. Frasconi, C., & Fontanell, M. (2014). Design and full realization of physical weed control (PWC) automated machine within the RHEA project. Proceedings International Conference of Agricultural Engineering, 134-143 24. Kulkarni, V. (2013). Advanced Agriculture Robotic Weed Control System. International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering, 2, Issue 10, 5073-5081 25. Bakhshipour, A. (2017). Weed segmentation using texture features extracted from wavelet sub-images. Biosystems Engineering, 157, 1-12 26. Kargar, A. (2013). Automatic Weed Detection And Smart Herbicide Spray Robot For Corn Fields. Robotics and Mechatronics (ICRoM), First RSI/ISM International Conference, 451-470 27. Potena, C. (2016). Fast and Accurate Crop and Weed Identification with Summarized Train Sets for Precision Agriculture. International Conference on Intelligent Autonomous Systems IAS. Intelligent Autonomous Systems, 14, 105-121 28. Slaughter, D., & Giles, D. (2018). Autonomous robotic weed control systems: A review. Computers and electronics in agriculture, 61, 63–78 29. Ospina, R. (2018). Smart Agricultural Vehicle by Integrating Motion Model with Machine Vision Data. Dissertation. Hokkaido University Collection of Scholarly and Academic Papers: HUSCAP 30. Dyrmann, M. (2015). Automatic Detection and Classification of Weed Seedlings under Natural Light Conditions. Thesis for: PhD. DOI: 10.13140/RG.2.2.29212.18560 31. Alba, O. (2019). Increased seeding rate and multiple methods of mechanical weed control reduce weed biomass in a poorly competitive organic crop. Field Crops Research, 245, 107-117 32. Bah, M. (2018). Deep Learning with unsupervised data labeling for weeds detection on UAV images. Remote Sensing 10(11), 15-17 33. Priya, S. (2019). Identification of Weeds using Hsv Color Spaces and Labelling with Machine Learning Algorithms. International Journal of Recent Technology and Engineering (IJRTE) ISSN: 2277-3878, 8, Issue-1, 1781-1786 34. Potena, C. (2019). Fast and Accurate Crop and Weed Identification with Summarized Train Sets for Precision Agriculture. Intelligent Autonomous Systems 14: Proceedings of the 14th International Conference IAS-14,105-121
  • 12. Asian Journal of Applied Science and Technology (AJAST) (Quarterly International Journal) Volume 4, Issue 2, Pages 70-81, April-June 2020 81 | P a g e Online ISSN: 2456-883X Website: www.ajast.net 35. Ahmed, F. (2019). Machine Learning for Crop and Weed Classification. Performance Analysis of Support Vector Machine and Bayesian Classifier for Crop and Weed Classification from Digital Images. World Applied Sciences Journal, 12(4), 432-440 36. Sharma, P. (2019). Crops and weeds classification using Convolutional Neural Networks via optimization of transfer learning parameters. International Journal of Engineering and Advanced Technology (IJEAT) ISSN: 2249-8958, 8, Issue-5, 2285-2294 37. Zhang, W. (2018). Broad-leaf weed detection in pasture. IEEE 3rd International Conference on Image, Vision and Computing, 15-23 38. Huang, H. (2016). A fully convolutional network for weed mapping of unmanned aerial vehicle (UAV) imagery Huasheng. PLoS ONE, 450-470 39. Hameed, S. (2018). Detection of Weed and Wheat Using Image Processing. Conference: 2018 IEEE 5th International Conference on Engineering Technologies and Applied Sciences (ICETAS), 34-39 40. Wang, S., & Liu, H. (2018). Low-Altitude Remote Sensing Based on Convolutional Neural Network for Weed Classification in Ecological Irrigation Area. IFAC-PapersOnLine, 51, Issue 17, 298-303 41. Huang, Y. (2019). UAV Low-Altitude Remote Sensing for Precision Weed Management. Weed Technology, 32, 1-5