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CN108009525A - A kind of specific objective recognition methods over the ground of the unmanned plane based on convolutional neural networks - Google Patents

A kind of specific objective recognition methods over the ground of the unmanned plane based on convolutional neural networks Download PDF

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CN108009525A
CN108009525A CN201711422364.9A CN201711422364A CN108009525A CN 108009525 A CN108009525 A CN 108009525A CN 201711422364 A CN201711422364 A CN 201711422364A CN 108009525 A CN108009525 A CN 108009525A
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张弘
罗昭慧
张泽宇
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Beihang University
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Abstract

The present invention relates to a kind of unmanned plane based on convolutional neural networks, specific objective recognition methods is as follows over the ground:(1) data set of specific objective over the ground that unmanned plane collects is labeled according to classification, and proportionally divides training set, verification collection, test set;(2) training convolutional neural networks model parameter, training parameter are set, starts to train, according to training, obtains the optimal solution of convolutional neural networks model.(3) change convolutional neural networks model depth, restart (2) training, obtain optimal convolutional neural networks model;(4) test set is tested, obtains recognition accuracy;(5) the convolutional neural networks model parameter that accuracy rate is met the requirements is applied to unmanned plane over the ground among specific objective actual scene, the image object that unmanned plane collects is identified.

Description

Convolutional neural network-based method for identifying specific target of unmanned aerial vehicle on ground
Technical Field
The invention relates to a method for identifying a specific target by an unmanned aerial vehicle based on a convolutional neural network, and belongs to the field of intersection of aviation and computer vision information processing.
Background
Unmanned Aerial Vehicles (UAVs) are unmanned aircraft that are operated by radio remote control devices and self-contained program control devices, or are operated autonomously, either completely or intermittently, by an onboard computer. Unmanned aerial vehicles can be classified into military and civil according to application fields. For military use, unmanned aerial vehicles divide into reconnaissance aircraft and target drone. In the civil aspect, the unmanned aerial vehicle + the industry application is really just needed by the unmanned aerial vehicle; at present, the unmanned aerial vehicle is applied to the fields of aerial photography, agriculture, plant protection, miniature self-timer, express transportation, disaster relief, wild animal observation, infectious disease monitoring, surveying and mapping, news reporting, power inspection, disaster relief, film and television shooting and the like, and the application of the unmanned aerial vehicle is greatly expanded.
In traditional target recognition, a certain amount of artificial features are extracted from an image, then the image is expressed by a mathematical model, and then the image is recognized by a classifier. For example, object recognition uses Scale-invariant feature transform (SIFT), face recognition uses Local texture features (LBP), pedestrian detection uses Histogram of Oriented Gradient features (HOG), and conventional classifiers mainly include Support Vector Machines (SVMs), K-nearest neighbors (KNNs), and the like. However, the recognition of such shallow machine learning methods is low, and the engineering requirements of unmanned aerial vehicles on ground target identification cannot be met generally.
With the development of artificial intelligence and the continuous breakthrough of deep learning, great success is achieved in the fields of voice recognition, natural language processing, computer vision, video analysis, multimedia and the like. The convolutional neural network target identification process based on deep learning mainly comprises the following steps: inputting the image into a neural network, minimizing a loss function by utilizing algorithms such as forward propagation and backward propagation errors of deep learning, updating a weight value to obtain a better identification model, and identifying a new image by utilizing the model. The convolutional neural network model is able to automatically learn features from the image data and is able to be quickly trained from new training data to learn new feature representations. The general pattern recognition system comprises two important parts of feature extraction and classifier, the optimization of the two parts is separated in the traditional method, and under the framework of a neural network, the feature extraction and classifier are optimized in a joint feedback mode, and the performance of joint cooperation of the feature extraction and the classifier can be played as much as possible.
However, the target identification method based on the convolutional neural network has strong dependence on a training data set, and the size of the image data of the ground target acquired by the unmanned aerial vehicle is uncertain, so that the training requirement of the convolutional neural network model cannot be met necessarily, or the information of the data set is wasted to a certain extent due to insufficient network depth. Therefore, the invention combines the characteristics of the unmanned aerial vehicle collected image and the advantages of the convolutional neural network model, adjusts the depth of the network model according to the data set to obtain the optimal network model structure, and provides the convolutional neural network target identification method which can adapt to the size of the unmanned aerial vehicle collected image data set.
Disclosure of Invention
The invention solves the problems: the method for recognizing the specific target of the unmanned aerial vehicle on the ground overcomes the problems that the recognition accuracy of the traditional method for recognizing the target of the unmanned aerial vehicle on the other aspects is not enough and the training data set of the deep learning method is difficult to meet, and provides the method for recognizing the specific target of the unmanned aerial vehicle on the ground based on the convolutional neural network. The method can also be applied to other complex pattern recognition and intelligent system designs.
The technical scheme of the invention is as follows: an unmanned aerial vehicle ground specific target identification method based on a convolutional neural network comprises the following steps:
(1) the method comprises the steps that a ground specific target image data set is acquired by using an unmanned aerial vehicle, is labeled according to categories, is divided into a training set, a verification set and a test set according to the labeled data set, and is finally processed into data types which can be identified by a convolutional neural network model;
(2) constructing an identification convolutional neural network model, setting maximum iteration times, learning rate and test frequency, selecting a back propagation method, starting training according to the setting and selection, and then obtaining the identification accuracy rate of the convolutional neural network model according to the change condition of a training loss function;
(3) on the basis of the structure of the convolutional neural network model, increasing or reducing the number of convolutional layers, restarting the training in the step (2), and when the recognition accuracy of the training convolutional neural network model reaches the highest, indicating that the trained convolutional neural network model adapts to the size of the current data set, and reserving the structure and parameters of the convolutional neural network model obtained by the training at the moment;
(4) testing the test set by using the convolutional neural network model obtained in the step (3) to obtain the identification accuracy, judging the identification accuracy, and if the identification accuracy can meet the actual engineering requirement, applying the convolutional neural network model to the actual task of identifying the specific target of the unmanned aerial vehicle to the ground to execute the step (5); if not, the training set cannot meet the actual engineering requirements, the training set needs to be expanded, and the steps (1), (2) and (3) are restarted until the actual engineering requirements are met;
(5) and applying the parameters of the convolutional neural network model with the accuracy meeting the actual engineering requirements to the actual scene of the specific target of the unmanned aerial vehicle, and identifying the image target acquired by the unmanned aerial vehicle.
In the step (2), the method for obtaining the convolutional neural network model of the parameter optimal solution comprises the following steps: and when the Loss function Loss of the training set does not exceed 0.001 in descending amplitude and the Loss function Loss of the verification set tends to rise at a critical point, obtaining the convolutional neural network model of the parameter optimal solution.
In the step (2), the maximum iteration number, the learning rate and the test frequency are set, and the back propagation method is selected as follows:
maximum number of iterations: 20 ten thousand times;
initial learning rate: 0.001;
testing frequency: 1000 iterations/1;
the back propagation method comprises the following steps: a random gradient descent algorithm.
And (3) the convolutional neural network model in the step (2) is 5 convolutional layers and is added with 3 full-connection layers.
And (4) increasing or reducing the number of layers in the step (3) to be no more than two.
Compared with the prior art, the invention has the advantages that:
(1) according to the method, the convolutional neural network model is adopted to identify the specific ground target of the unmanned aerial vehicle, the unmanned aerial vehicle has various specific ground target types, such as ships, pedestrians and vehicles, the characteristics of the targets are greatly changed, compared with the traditional method, the manually designed characteristics are difficult to completely express target information, the convolutional neural network is utilized to perform feedback learning, characteristic expression with robustness can be learned, and therefore the requirement on identification accuracy is met;
(2) according to the convolutional neural network model training method, a global optimal solution is obtained through training loss function change and testing loss function change conditions, compared with a general target identification method based on a convolutional neural network, the fixed iteration times are set through priori information, the training efficiency can be improved, and meanwhile, the identification accuracy of a convolutional neural network model can also be improved;
(3) the different-depth convolutional neural network model construction method provided by the invention changes the depth of the network model for training and testing aiming at different data sets to obtain the convolutional neural network model with the optimal depth. The general target identification method of the convolutional neural network model has the advantages that the structure of the network model is usually fixed, the existing data set cannot well meet the training requirement of the network model, or the information of the data set is wasted, the method can adapt to different data sets, and therefore the optimization of the structure and the parameters of the convolutional neural network model is achieved.
Drawings
FIG. 1 is a schematic flow chart of the method for identifying a specific target of an unmanned aerial vehicle on the ground based on a convolutional neural network;
FIG. 2 is a diagram of a convolutional neural network model architecture of the present invention;
FIG. 3 is a graph of the loss function variation of the convolutional neural network model during the training process in the present invention;
FIG. 4 is a graph showing the change in the accuracy of the convolutional neural network model during the training process of the present invention.
FIG. 5 is a graph of the test results of the present invention.
The reference numbers and symbols in the figures are as follows:
Jcv(θ) -cross validation set loss function variation curves;
Jtrain(θ) -training set loss function variation curve;
iteration-the number of training iterations;
test accuracy-training is the test accuracy variation curve.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Training algorithm
For the supervised identification task of the convolutional neural network, because the categories of all image samples are known in advance, the samples of different categories are distributed on different spatial regions according to the spatial distribution of the same image sample. After a long-time training of the image data set, parameters of the convolutional neural network are continuously updated, and boundary positions for dividing sample space classification are obtained to classify the images. Convolutional neural networks are essentially an input-to-output mapping, learning a function mapping that maps an input image to a k-dimensional feature vector according to certain principles. As long as the convolutional network is trained to obtain the connection weight between networks, the network can learn the mapping capability between input and output pairs by activating the function.
The training algorithm is mainly divided into a forward propagation stage and a backward propagation stage:
first, forward propagation phase: a set of samples (X, Y) is input to the network, where X represents sample data and Y represents a sample label. Through the hierarchical calculation of the network, namely the input is multiplied by the weight matrix of each layer, and the corresponding output value h is obtained after the layer-by-layer operationθ(x) In that respect In the forward propagation stage, the network randomly initializes the weights of the network connections.
Second stage, back propagation stage: calculating the actual output hθ(x) The error from the corresponding ideal output Y, i.e. the value of the cost function. The weight matrix is adjusted by back propagation through a method of minimizing errors.
Second, cost function (LOSS):
for the network output signal hθ(x) And target desired signal y, which is a vector of dimension k. The error between the neural network output and the actual value, i.e. the loss function, is calculated by using the euclidean distance, and the cost function of the neural network can be expressed as:
and (4) calculating one layer by one layer from the first layer in a forward propagation algorithm, and solving the result of each layer obtained by the activation function until the last layer. However, to minimize the loss function value of the entire network, iterations are required to update the parameters and biases in front of the neurons. The minimum loss function of the network model is calculated by using a back propagation algorithm, namely, the error of the last layer is calculated firstly, then the error of each layer is reversely solved layer by layer, and the weight and the bias are updated by using the obtained residual error.
Third, Back Propagation (BP):
most neural network models can solve parameters of the network by using a gradient descent method, and a back propagation algorithm is needed when parameters are updated by network training samples. Firstly, initializing a weight parameter of a network into a group of random values; and secondly, performing iterative training by using the training data. Calculating the error between the output of the neural network model and the expected output, namely the loss function value, propagating the error from the last layer to the previous layer to the input, and updating the weight of each layer of network according to a gradient algorithm until the condition is met or the maximum iteration number is exceeded and stopping.
When the back propagation algorithm is applied to the convolutional neural network, the BP algorithm steps are as follows: assuming that the activation function is sigmoid function, the neural network has m layers in total, and the k layer has skOne neuron for the ith neuron of the k layer, WijRepresenting the weight coefficient associated therewith, s exists in the previous layerk-1A weight coefficient Wi1,Wi2,···,Wij,···,Is connected thereto, biIndicating the bias.
The execution of the BP algorithm comprises the following steps:
(1) for the weight coefficient WijRandomly setting an initial value, inputting a sample (x, y), wherein x represents the sample, and y represents the expected output;
(2) computing the output of each layer, for the output of the ith neuron of the k layerComprises the following steps:
(3) error of learning of each layer is calculated
For the output layer there is k-m,
for other layers, there are
(4) According to the errorCorrection weight coefficient WijAnd bias bi
Wherein,denotes the (k-1) th layerjOne output, t denotes the number of iterations, η denotes the learning rate, α denotes the random gradient momentum.
(5) And after the weight values of all layers of the convolutional neural network are calculated, judging whether the weights are met according to conditions. If the requirements are met, the algorithm is ended; and if not, returning to the step (2) for execution.
Fourth, the solution
The method of the invention, as shown in figure 1, comprises the following steps:
(1) marking a ground target data set acquired by an unmanned aerial vehicle according to categories, dividing the marked image data set into a training set, a verification set and a test set according to a certain proportion, namely 3:1:1, and then processing the image data set into data types which can be identified by a convolutional neural network model.
(2) And (3) constructing a convolutional neural network model, wherein as shown in fig. 2, the front five layers are convolutional layers, the rear two layers are full-connection layers, and the last layer is a classified output layer, wherein 4 times of downsampling is carried out between the input layer and the first convolutional layer, 2 times of downsampling is carried out between the second convolutional layer and the third convolutional layer, and 2 times of downsampling is carried out between the fifth convolutional layer and the first full-connection layer. Setting training parameters and training methods, for example: maximum iteration times, learning rate, test frequency, back propagation method, etc., to begin training the model. And obtaining the optimal solution at the moment according to the change condition of the training loss function. When the Loss function (Loss) of the training set slowly decreases (the variation amplitude is less than 0.001), and the Loss function (Loss) of the verification set tends to rise at a critical point, the network parameters reach the global optimum, and the convolutional neural network model parameters obtained by training at the moment are stored.
(3) On the structure of the convolutional neural network model, the number of convolutional layers of the convolutional neural network model is properly increased or reduced (the number of the convolutional layers is increased or reduced by no more than two layers), the training is restarted, when the identification accuracy of the convolutional neural network model reaches the highest, the convolutional neural network model is relatively suitable for the size of the current data set, and the structure and the parameters of the convolutional neural network model at the moment are reserved.
(4) And (3) testing the test set by using the convolutional neural network model obtained in the step (3) to obtain the identification accuracy, applying the convolutional neural network model to an actual identification task when the identification accuracy meets the actual engineering requirement, if the identification accuracy does not meet the actual engineering requirement, indicating that the training data set cannot meet the actual engineering requirement, expanding the data set, and restarting the steps (1), (2) and (3).
(5) And applying the convolutional neural network model parameters with the accuracy meeting the requirements to the actual scene of the specific target on the ground of the unmanned aerial vehicle, and identifying the image target acquired by the unmanned aerial vehicle.
The performance of the unmanned aerial vehicle ground-specific target identification method based on deep learning provided by the invention is verified through a specific embodiment, an image data set to be identified is acquired by an unmanned aerial vehicle vision system and is used as an object to be verified, and a deep learning framework based on cafe 1 is adopted.
As shown in fig. 1, the method comprises the following specific steps:
(1) preprocessing the image:
the image data set acquired by the unmanned aerial vehicle is classified into 3 types of targets (ships, pedestrians and vehicles) with 6000 sheets in total, images in the data set are labeled according to the types, and the labeled image data set is divided into a training set, a cross validation set and a test set according to the ratio of 3:1: 1. The image data set is then processed into a data type recognizable by the network model, converted into the lmdb format.
(2) Constructing convolutional neural network model
According to the convolutional neural network model structure, as shown in fig. 2, a prototxt file of a network structure is written, a front 5-layer network is a convolutional layer, and a rear 3-layer network is a full-connection layer. Where Stride of 4 indicates a convolution step of 4, and maxporoling indicates a method using maximum downsampling.
(3) Training a network model:
firstly, setting training parameters: the maximum iteration frequency is set to be 20 ten thousand times, the initial learning rate is 0.001, and a network model begins to be trained by adopting a random gradient descent back propagation algorithm.
And observing the training condition to obtain the optimal solution of the convolutional neural network model. As shown in fig. 3, in the Loss function variation curve of the convolutional neural network model during the training process, when the Loss function (Loss) of the training set decreases slowly, and the Loss function (Loss) of the verification set tends to rise at the critical point, the parameters of the convolutional neural network model reach the global optimal solution. As shown in fig. 4, the test accuracy of the final training model is about 0.99, which indicates that the target recognition accuracy of the convolutional neural network model is high.
(4) Modifying the network model:
adding 1 volume base layer on the structure of the convolutional neural network model shown in fig. 1, restarting the training, and finding that the accuracy of the final target recognition accuracy is slightly reduced by 0.5. 1 volume base layer is reduced on the structure of the convolutional neural network model shown in FIG. 1, the training is restarted, and the final target recognition accuracy rate is found to be slightly reduced by 0.3. The convolutional neural network model of 5 convolutional layers is relatively in accordance with the requirement of the data set, and no modification is needed.
(5) Testing the network model:
and (4) importing the network parameters obtained in the step (3) into a test network, as shown in fig. 5, for three types of targets of the unmanned aerial vehicle to the ground: and identifying the test image according to the identification results of the ship, the vehicle and the pedestrian to obtain correct identification results.
The above examples are provided only for the purpose of describing the present invention, and are not intended to limit the scope of the present invention. The scope of the invention is defined by the appended claims. Various equivalent substitutions and modifications can be made without departing from the spirit and principles of the invention, and are intended to be within the scope of the invention.

Claims (5)

1. An unmanned aerial vehicle ground specific target identification method based on a convolutional neural network is characterized in that: the method comprises the following steps:
(1) the method comprises the steps that a ground specific target image data set is acquired by using an unmanned aerial vehicle, is labeled according to categories, is divided into a training set, a verification set and a test set according to the labeled data set, and is finally processed into data types which can be identified by a convolutional neural network model;
(2) constructing an identification convolutional neural network model, setting maximum iteration times, learning rate and test frequency, selecting a back propagation method, starting training according to the setting and selection, and then obtaining the identification accuracy rate of the convolutional neural network model according to the change condition of a training loss function;
(3) on the basis of the structure of the convolutional neural network model, increasing or reducing the number of convolutional layers, restarting the training in the step (2), and when the recognition accuracy of the training convolutional neural network model reaches the highest, indicating that the trained convolutional neural network model adapts to the size of the current data set, and reserving the structure and parameters of the convolutional neural network model obtained by the training at the moment;
(4) testing the test set by using the convolutional neural network model obtained in the step (3) to obtain the identification accuracy, judging the identification accuracy, and if the identification accuracy can meet the actual engineering requirement, applying the convolutional neural network model to the actual task of identifying the specific target of the unmanned aerial vehicle to the ground to execute the step (5); if not, the training set cannot meet the actual engineering requirements, the training set needs to be expanded, and the steps (1), (2) and (3) are restarted until the actual engineering requirements are met;
(5) and applying the parameters of the convolutional neural network model with the accuracy meeting the actual engineering requirements to the actual scene of the specific target of the unmanned aerial vehicle, and identifying the image target acquired by the unmanned aerial vehicle.
2. The convolutional neural network-based unmanned aerial vehicle ground-specific target identification method of claim 1, wherein: in the step (2), the method for obtaining the convolutional neural network model of the parameter optimal solution comprises the following steps: and when the Loss function Loss of the training set does not exceed 0.001 in descending amplitude and the Loss function Loss of the verification set tends to rise at a critical point, obtaining the convolutional neural network model of the parameter optimal solution.
3. The convolutional neural network-based unmanned aerial vehicle ground-specific target identification method of claim 1, wherein: in the step (2), the maximum iteration times, the learning rate and the test frequency are set, and the reverse propagation method is selected as follows:
maximum number of iterations: 20 ten thousand times;
initial learning rate: 0.001;
testing frequency: 1000 iterations/1;
the back propagation method comprises the following steps: a random gradient descent algorithm.
4. The convolutional neural network-based unmanned aerial vehicle ground-specific target identification method of claim 1, wherein: and (3) identifying the convolutional neural network model as 5 convolutional layers and adding 3 full-connection layers in the step (2).
5. The convolutional neural network-based unmanned aerial vehicle ground-specific target identification method of claim 1, wherein: and (4) increasing or reducing the number of layers to be not more than two in the step (3).
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