CN113610108B - Rice pest identification method based on improved residual error network - Google Patents
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Abstract
The invention discloses a rice pest identification method based on an improved residual error network, which comprises the following steps: a training stage: step 1: acquiring a large-scale pest identification data set; and 2, step: preprocessing a pest identification data set, comprising: rotation, flipping, illumination processing, contrast processing, color balance processing, and sharpness processing; and step 3: constructing a picture classification network model, namely an improved residual error network model; and 4, step 4: dividing a pest identification data set into a training set and a testing set according to a certain proportion, training the constructed picture classification network model through the training set, and storing the trained picture classification network model; and (3) a testing stage: and 5: and inputting the test set images into a trained improved residual error network model for rice pest identification, and outputting the identification result accuracy. The method can make up for the defect that a residual error network loses a large amount of information during output, and improves the identification accuracy of the model.
Description
Technical Field
The invention relates to the technical field of deep learning, in particular to a rice pest identification method based on an improved residual error network.
Background
In recent years, with the rise of artificial intelligence, deep learning has gained wide attention and application in the fields of computer vision, natural language processing, emotion calculation and the like, and many researchers apply the deep learning to the agricultural field and have preliminarily explored on the identification of crop pests.
At present, convolutional neural networks are widely applied to the field of image recognition, wherein representative networks are mainly AlexNet, VGG, GoogleNet, ResNet and DenseNet, and based on the above network models, many improved network models are proposed, which achieve better effect than conventional artificial identification of crop pests, but in the process of constructing a deep convolutional neural network, when a gradient signal is propagated backwards from a bottom layer to a top layer, the gradient signal is gradually attenuated, thereby causing loss of a large amount of characteristic information.
The key nature of the capsule network makes it possible to retain detailed information about the position and pose of the image, which occupies a prominent position in the image recognition. The capsule network is embedded into the residual error network to construct an improved residual error network model, so that the problem of information loss in the network construction process can be solved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a rice pest identification method based on an improved residual error network aiming at the defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a rice pest identification method based on an improved residual error network, which comprises the following steps:
a training stage:
step 1: acquiring a large-scale pest identification data set;
step 2: preprocessing a pest identification data set, comprising: rotation, flipping, illumination processing, contrast processing, color balance processing, and sharpness processing;
and step 3: constructing a picture classification network model, namely an improved residual error network model: performing convolution and downsampling on an input image to extract the features of the image, and reducing the size of a feature map and improving the channel of the feature map through four basicblocks; encapsulating and coding the characteristic diagram, converting the characteristic diagram into a plurality of capsules, then carrying out interlayer Routing, and mapping the characteristic diagram to a certain space by adopting an approximate full-connection mode of a Dynamic Routing algorithm; in the problem of classification and identification of a plurality of pests, the Dynamic Routing algorithm maps capsule features to an M × N space, namely each class corresponds to 1N-dimensional feature, then the capsule features are compressed into 1M-dimensional vector by using nonlinear mapping, the maximum value of an L2 paradigm is taken as a final predicted value label, and finally the vector of the capsule is output;
and 4, step 4: dividing a pest identification data set into a training set and a testing set according to a certain proportion, training the constructed picture classification network model through the training set, and storing the trained picture classification network model;
and (3) a testing stage:
and 5: and inputting the test set images into a trained improved residual error network model for rice pest identification, and outputting the identification result accuracy.
Further, in the step 1 of the present invention:
the pest identification data set is a hierarchical structure and is divided into 8 crop major categories and 102 pest minor categories, and the pest identification data set comprises more than 75000 pest samples; the categories include: rice leaf roller, rice snout moth's fly, rice leaf miner, chilo suppressalis, yellow rice borer, rice gall midge, rice stem fly, rice brown planthopper, white back planthopper, gray rice louse, rice water weevil, rice leafhopper, thrips graminis and rice hull pests.
Further, the method for preprocessing the pest identification data set in the step 2 of the present invention specifically comprises:
rotating at the rotation angles of 90 degrees, 180 degrees and 270 degrees respectively;
turning, wherein the turning mode is up-down turning and horizontal turning;
by adopting a data enhancement technology including illumination processing, contrast processing, color balance processing and sharpness processing, the data uniformity is achieved, the total number of pictures reaches 20670, and the generalization capability of the model and the robustness of the model are improved.
Further, the improved residual error network model constructed in the step 3 of the present invention specifically is:
firstly, performing convolution and downsampling on an input image to extract the characteristics of the image; the method for extracting the features comprises the following steps:
output image size ═ (input image-1) stride + output mapping-2 mapping + kernel _ size
Wherein stride represents a step size, outputpadding represents the number of layers of an output edge complement 0, padding represents a filling amount, and kernel _ size represents the size of a convolution kernel;
by four Basicblocks, the size of the feature map is reduced to 7 multiplied by 7, the channel of the feature map is improved to 512, and more sample features can be captured in this way;
then, encapsulating and coding the characteristic diagram of 512 × 7 × 7, converting the characteristic diagram into 32 capsules of 8 × 8, obtaining 32 capsules of 8 × 2 × 2 after 2 times of Conv1d, then performing interlayer Routing, and mapping the characteristic diagram to a space of 14 × 16 by adopting an approximate full-connection mode of a Dynamic Routing algorithm;
in the problem of 14 pest classification identification, the Dynamic Routing algorithm maps capsule features to a 14 × 16 space, that is, each class corresponds to 1 16-dimensional feature, then compresses the capsule features into 1 14-dimensional vector by using a nonlinear mapping, that is, Squash, and takes the maximum value of the L2 paradigm as a final predicted value label, and the vector output of the final capsule is as follows:
the derivation process is as follows:
the probability that each upper layer capsule i is connected to a lower layer j is:
in the formula cijIs a weight coefficient, bijIs the prior probability of capsule i connecting to capsule j, initially 0; then applying a transformation matrix wijWill uiConversion to prediction vectors
All resulting prediction vectors are then summed weighted:
wherein SjReferred to as the total input vector of the high-level capsule j. Replacing the activation function Relu of the traditional neural network with a non-linear flattening function squaring ensures that the direction of the vector remains unchanged, but its length is strongly required to not exceed 1, and the vector output of the final capsule is as follows:
the maximum value of the L2 paradigm of vector outputs is taken as the final predictor label, and each vector corresponds to the likelihood of one classification category.
Further, the specific method of the Dynamic Routing algorithm of the present invention is as follows:
1) first all the prediction vectors are obtained
Defining iteration times r and the l layer of the network to which the current input capsule belongs;
2) for all input capsules i and output capsules j, a parameter b is definedijInitialized to 0, for the action of this parameter, described in the next step;
3) starting iteration from the step 4) to the step 7), wherein the iteration number is r;
4) calculating vector cjValue of (1), i.e. all routing rights of capsule iValue, to guarantee ∑jcij1, so a softmax function is used to guarantee each cijNon-negative and a sum of 1;
due to the first iteration bijInitialized to 0, thus cijEqual in the first iteration, i.e. 1/p, p refers to the number of higher layer capsules;
5)
carrying out weighted summation on the prediction vectors;
6) the vector of the last step passes through a non-linear function square, which ensures that the direction of the vector remains unchanged, but its length is forced not to exceed 1; this step outputs the final vector Vj；
7) This step is where the weight is updated, via the output V of the capsule jjAnd a prediction vector
Dot product of + original weight bijNew weight value; performing dot product processing to detect the similarity between input and output of the capsule; after the weight is updated, carrying out the next iteration;
8) after r iterations, the final output vector V is returnedj。
Further, the method for training in step 4 of the present invention specifically includes:
a rice pest data set is randomly divided into a training set and a testing set according to the ratio of 8:2, small-batch gradient descent is adopted as a network training optimizer in the training process, and the momentum parameter is set to be 0.8. The initial learning rate is set to 0.005, the batch size is 32, and the iteration times are 100 rounds;
the small batch gradient descent method is a compromise between the batch gradient descent method and the random gradient descent method, that is, for m samples, x samples are adopted for iteration, 1< x < m, and x is 10, and the value of x can be adjusted according to the data of the samples; the corresponding update formula is:
wherein, the assumed function of linear regression is:
hθ(x(i))＝θ1x(j)+θ0
wherein, theta0And theta1Is a parameter; i is 1,2, …, m represents the number of samples, j is 0,1 represents the feature number, α is the learning rate, θ isiIs a parameter, yjIs the corresponding regression value.
The invention has the following beneficial effects: according to the rice pest identification method based on the improved residual error network, the residual error network is selected as the basic network model, the capsule network is added on the basis, and the capsule network is used as the full connection layer of the ResNet network model, so that the defect that the residual error network loses a large amount of information during output can be overcome, and the identification accuracy of the model is improved. The advantages are that: (1) the extracted image characteristic information is richer; (2) the model identification accuracy is higher.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a diagram of an improved residual network architecture in accordance with an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The rice pest identification method based on the improved residual error network comprises the following steps:
(1) inputting a training data set
In 2019, Wuxian et al published a large-scale pest identification data set IP102 and performed professional image annotation work. The data set categories are still hierarchical and are divided into 8 crop major categories and 102 pest minor categories. IP102 is the largest pest identification data set to date, containing 75000 pest samples whose categories almost encompass the most common pest species currently. At present, the IP102 provides an excellent experimental reference for the pest identification field, and solves the problem of few pest image data set samples to a certain extent. From the IP102 data set, the rice pests in the data set are selected for specific research, and the data set relates to 14 categories of rice leaf rollers, rice bollworms, rice leaf miners, chilo suppressalis, tryporyza incertulas, rice gall midges and the like, wherein the total number of images is 8417, and the data set is used as a rice pest image data set for experimental research of the invention. Table 1 gives the details of this data set.
Table 1 data set details
(2) Preprocessing of data sets
The rice pests in the IP102 data set have the phenomenon of too many or too few samples, so that the sample distribution is unbalanced, and in order to make up for the influence of the type unbalance of the samples on the model identification accuracy, the method carries out enhancement processing on a small number of sample data before training. In deep learning, data enhancement refers to expanding a data set with small data volume into more data through some technical means. According to the invention, through data enhancement technologies such as rotation (the rotation angles are respectively 90 degrees, 180 degrees and 270 degrees), overturning (the overturning mode is up-down overturning and horizontal overturning), illumination processing, contrast processing, color balance processing and sharpness processing, data uniformity is achieved, the total number of pictures reaches 20670, and the generalization capability of the model and the robustness of the model are improved.
(3) Picture classification model design
Firstly, performing convolution and downsampling on an input image to extract the characteristics of the image; the method for extracting the features comprises the following steps:
output image size ═ (input image-1) stride + output mapping-2 mapping + kernel _ size
Wherein stride represents a step size, outputpadding represents the number of layers of an output edge complement 0, padding represents a filling amount, and kernel _ size represents the size of a convolution kernel;
by four Basicblocks, the size of the feature map is reduced to 7 × 7, and the channel of the feature map is raised to 512, so that more sample features can be captured.
Then, the 512 × 7 × 7 feature map is encapsulated and converted into 32 8 × 8 capsules, and then the 32 8 × 2 × 2 capsules are obtained after 2 times of Conv1d, and then interlayer Routing is performed to map the capsules into a 14 × 16 space in an approximately fully connected manner (i.e., Dynamic Routing).
In the problem of 14 pest classification identification, the Dynamic Routing algorithm maps capsule features to a 14 × 16 space, that is, each class corresponds to 1 16-dimensional feature, and then compresses the capsule features into 1 14-dimensional vector by using a nonlinear mapping (that is, square), taking the maximum value of the L2 paradigm as a final predicted value label, and the vector output of the final capsule is as follows:
the derivation process is as follows:
the probability that each upper layer capsule i is connected to a lower layer j is:
in the formula cijIs a weight coefficient, bijIs the prior probability of capsule i connecting to capsule j, initially 0; then applying a transformation matrix wijWill uiConversion to prediction vectors
All resulting prediction vectors are then summed weighted:
wherein SjReferred to as the total input vector of the high-level capsule j. Replacing the activation function Relu of the conventional neural network with a non-linear flattening function squaring ensures that the direction of the vector remains unchanged, but its length is forced to not exceed 1, and the vector output of the final capsule is as follows:
the maximum value of the L2 paradigm of vector outputs is taken as the final predictor label, and each vector corresponds to the likelihood of one classification category.
The specific method of the Dynamic Routing algorithm comprises the following steps:
1) first all the prediction vectors are obtained
Defining iteration times r and the l layer of the network to which the current input capsule belongs;
2) for all input capsules i and output capsules j, a parameter b is definedijInitialized to 0, for the action of this parameter, described in the next step;
3) starting iteration from the step 4) to the step 7), wherein the iteration number is r;
4) calculating the vector cjThe value of (a), i.e. all routing weights of capsule i, is to guarantee ∑jcij1, so a softmax function is used to guarantee each cijNon-negative and a sum of 1;
due to the first iteration bijInitialized to 0, thus cijEqual in the first iteration, i.e. 1/p, p refers to the number of higher layer capsules;
5)
prediction vectorCarrying out weighted summation;
6) the vector of the last step passes through a non-linear function square, which ensures that the direction of the vector remains unchanged, but its length is forced not to exceed 1; this step outputs the final vector Vj；
7) This step is where the weight is updated, via the output V of the capsule jjAnd a prediction vector
Dot product of + original weight bijNew weight value; performing dot product processing to detect the similarity between input and output of the capsule; after the weight is updated, carrying out the next iteration;
8) after r iterations, the final output vector V is returnedj。
(4) Network model learning training
A rice pest data set is randomly divided into a training set and a testing set according to the ratio of 8:2, small-batch gradient descent is adopted as a network training optimizer in the training process, and the momentum parameter is set to be 0.8. The initial learning rate was set to 0.005, the batch size was 32, and the number of iterations was 100 rounds.
The small batch gradient descent method is a compromise between the batch gradient descent method and the random gradient descent method, i.e. for m samples, we iterate with x samples, 1< x < m. Generally, x may be 10, and of course, the value of x may be adjusted according to the data of the sample. The corresponding update formula is:
wherein, the assumed function of linear regression is:
hθ(x(i))＝θ1x(j)+θ0
wherein, theta0And theta1Is a parameter; i is 1,2, …, m represents the number of samples, j is 0,1 represents the feature number, α is the learning rate, θ isiIs a parameter, yjIs the corresponding regression value.
(5) And inputting the test set images into the trained improved residual error network model for rice pest identification, and outputting the identification result accuracy.
It will be appreciated that modifications and variations are possible to those skilled in the art in light of the above teachings, and it is intended to cover all such modifications and variations as fall within the scope of the appended claims.
Claims (4)
1. A rice pest identification method based on an improved residual error network is characterized by comprising the following steps:
a training stage:
step 1: acquiring a large-scale pest identification data set;
step 2: preprocessing a pest identification data set, comprising: rotation, flipping, illumination processing, contrast processing, color balance processing, and sharpness processing;
and step 3: constructing a picture classification network model, namely an improved residual error network model: performing convolution and downsampling on an input image to extract the features of the image, and reducing the size of a feature map and improving the channel of the feature map through four basicblocks; encapsulating and coding the characteristic diagram, converting the characteristic diagram into a plurality of capsules, then carrying out interlayer Routing, and mapping the characteristic diagram to a certain space by adopting an approximate full-connection mode of a Dynamic Routing algorithm; in the problem of classification and identification of a plurality of pests, the Dynamic Routing algorithm maps capsule features to an M × N space, namely each class corresponds to 1N-dimensional feature, then the capsule features are compressed into 1M-dimensional vector by using nonlinear mapping, the maximum value of an L2 paradigm is taken as a final predicted value label, and finally the vector of the capsule is output;
and 4, step 4: dividing a pest identification data set into a training set and a testing set according to a certain proportion, training the constructed picture classification network model through the training set, and storing the trained picture classification network model;
and (3) a testing stage:
and 5: inputting the test set images into a trained improved residual error network model for rice pest identification, and outputting the accuracy of the identification result;
the improved residual error network model constructed in the step 3 specifically comprises:
firstly, performing convolution and downsampling on an input image to extract the characteristics of the image; the method for extracting the features comprises the following steps:
output image size ═(input image-1)' stride + outputpaging-2
Wherein stride represents a step size, outputpadding represents the number of layers of an output edge complement 0, padding represents a filling amount, and kernel _ size represents the size of a convolution kernel;
by four Basicblocks, the size of the feature map is reduced to 7 multiplied by 7, the channel of the feature map is improved to 512, and more sample features can be captured in this way;
then, encapsulating and coding the characteristic diagram of 512 multiplied by 7, converting the characteristic diagram into 32 capsules of 8 multiplied by 8, convolving for 2 times to finally obtain 32 capsules of 8 multiplied by 2, then carrying out interlayer Routing, and mapping the capsules to a space of 14 multiplied by 16 by adopting an approximate full connection mode of a Dynamic Routing algorithm;
in the problem of 14 pest classification identification, the Dynamic Routing algorithm maps capsule features to a 14 × 16 space, that is, each class corresponds to 1 16-dimensional feature, then compresses the capsule features into 1 14-dimensional vector by using a nonlinear mapping, that is, Squash, and takes the maximum value of the L2 paradigm as a final predicted value label, and the vector output of the final capsule is as follows:
the derivation process is as follows:
the probability that each upper layer capsule i is connected to a lower layer j is:
in the formula cijIs a weight coefficient, bijIs the prior probability of capsule i connecting to capsule j, initially 0;then applying a transformation matrix wijWill uiConversion to prediction vectors
All resulting prediction vectors are then summed weighted:
wherein SjReplacing the activation function Relu of the traditional neural network with a non-linear squashing function squaring, called the total input vector of the high-level capsule j, ensures that the direction of the vector remains unchanged, but its length is strongly required not to exceed 1, and the vector output of the final capsule is as follows:
taking the maximum value of the L2 paradigm output by the vectors as a final predicted value label, wherein each vector corresponds to the possibility of one classification category;
the specific method of the Dynamic Routing algorithm comprises the following steps:
1) first all the prediction vectors are obtained
Defining iteration times r and the l layer of the network to which the current input capsule belongs;
2) for all input capsules i and output capsules j, a parameter b is definedijInitialized to 0, for the action of this parameter, described in the next step;
3) starting iteration from the step 4) to the step 7), wherein the iteration number is r;
4) calculating vector cjThe value of (a), i.e. all routing weights of capsule i, is to guarantee ∑jcij1, so a softmax function is used to guarantee each cijNon-negative and a sum of 1;
due to the first iteration bijInitialized to 0, thus cijEqual in the first iteration, i.e. 1/p, p refers to the number of higher layer capsules;
5)
carrying out weighted summation on the prediction vectors;
6) the vector of the last step passes through a non-linear function square, which ensures that the direction of the vector remains unchanged, but its length is forced not to exceed 1; this step outputs the final vector Vj；
7) This step is where the weight is updated, via the output V of the capsule jjAnd a prediction vector
Dot product of + original weight bijNew weight value; performing dot product processing to detect the similarity between input and output of the capsule; after the weight is updated, carrying out the next iteration;
8) after r iterations, the final output vector V is returnedj。
2. The method for identifying rice pests based on the improved residual error network as claimed in claim 1, wherein in the step 1:
the pest identification data set is a hierarchical structure and is divided into 8 crop major categories and 102 pest minor categories, and the pest identification data set comprises more than 75000 pest samples; the categories include: rice leaf roller, rice snout moth's fly, rice leaf miner, chilo suppressalis, yellow rice borer, rice gall midge, rice stem fly, rice brown planthopper, white back planthopper, gray rice louse, rice water weevil, rice leafhopper, thrips graminis and rice hull pests.
3. The rice pest identification method based on the improved residual error network as claimed in claim 1, wherein the method for preprocessing the pest identification data set in the step 2 specifically comprises:
rotating at the rotation angles of 90 degrees, 180 degrees and 270 degrees respectively;
turning, wherein the turning mode is up-down turning and horizontal turning;
by adopting a data enhancement technology including illumination processing, contrast processing, color balance processing and sharpness processing, the data uniformity is achieved, the total number of pictures reaches 20670, and the generalization capability of the model and the robustness of the model are improved.
4. The method for identifying rice pests based on the improved residual error network as claimed in claim 1, wherein the training in the step 4 specifically comprises:
randomly dividing a rice pest data set into a training set and a testing set according to a ratio of 8:2, in the training process, adopting small batch gradient descent as a network training optimizer, setting the momentum parameter to be 0.8, setting the initial learning rate to be 0.005, setting the batch size to be 32 and carrying out 100 rounds of iteration times;
the small batch gradient descent method is a compromise between the batch gradient descent method and the random gradient descent method, that is, for m samples, x samples are adopted for iteration, 1< x < m, and x is 10, and the value of x can be adjusted according to the data of the samples; the corresponding update formula is:
wherein, the assumed function of linear regression is:
hθ(x(i))＝θ1x(j)+θ0
wherein, theta0And theta1Is a parameter; i is 1,2, …, m represents the number of samples, j is 0,1 represents the feature number, α is the learning rate, θ isiIs a parameter, yjIs the corresponding regression value.
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| 一种基于卷积神经网络参数优化棉花等级分类算法;陈智勇 等;《中国纤检》;20201231;第116-119页 * |
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