CN106682694A - Sensitive image identification method based on depth learning - Google Patents
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Abstract
The invention belongs to the technical field of digital image processing, and particularly relates to a sensitive image identification method based on depth learning. The method mainly comprises following steps of preprocessing sensitive images; dividing all preprocessed sensitive image databases into a training set and a test set, wherein the training set is divided into a train part and a validation part with proportion of 5:1, and using the images of the training set in a depth convolution neural network training, wherein parameters between layers of the convolution neural network are obtained through the training; after the training is finished, using a trained model to initializing a test neural network, wherein the test neural network is the same as a trained grid in structure; and inputting test sensitive images into the initialized depth neural network for identification test, thereby achieving identification of the sensitive images. According to the invention, functions of extraction and classification of features can be finished without manual participation and adjustment, and the reliable sensitive image identification method with high performance is provided.
Description
Technical field
The invention belongs to digital image processing techniques field, and in particular to a kind of nude picture detection based on deep learning
Method.
Background technology
As the Internet is particularly the rapid popularization of mobile Internet, the multi-medium data with image, video as representative is just
Increased with surprising rapidity.How to detect that the sensitive image in internet content becomes the focus of research.Sensitive image
Refer mainly to:Pornographic, violence, reaction, sensitive personage are (such as:Dalai) etc., traditional monitoring method relies primarily on manpower, with many matchmakers
The explosive increase held in vivo, the mode for manually checking cannot meet and be actually needed.On the one hand it is the number such as video image
According in explosive growth, manual type cannot undertake huge verification workload;On the other hand be exist it is a large amount of out-of-date
Or the data being checked, cause a large amount of useless repeated workloads.
Deep learning belongs to machine learning, and deep learning is the focus in machine learning field in recent years, in speech recognition, figure
As the fields such as identification achieve huge success.
The research that deep learning technology has very long developing history, early stage artificial neural network promotes deep learning
Produce.General, deep learning refers to the Deep model of input layer, multiple hidden layers and output layer.Backpropagation techniques exist
The eighties in 20th century is especially popular, is the algorithm of weight between famous learning network layers.Yann LeCun are adopted at first
Handwritten numeral image is recognized with the back propagation convolutional network for having supervision of depth.In recent years, using depth convolution net
Network identification handwritten numeral image has become the research topic of computer vision and machine learning field most worthy, at the two
In field, deep learning technology all achieves state-of-the-art achievement.Convolutional neural networks (CNN) are carried by Krizhevsky et al.
Go out, and won the champion of ImageNet image classifications using the technology in 2012.ImageNet is a large-scale number
According to collection, possess 15,000,000 markd images, belong to 22000 classifications.Image inside ImageNet is received from the Internet
Collection, is made marks using the instrument Mechanical Turk crowd-source of Amazon through artificial mode,
From the beginning of 2010, ImageNet data sets as the extensive visual identity challenges (ILSVRC) of ImageNet one
Part, holds every year once, and using 1000 classifications in ImageNet, each classification includes 1000 images to ILSVRC, 120
Used as training set, 50000 images have 8 to image as checking collection, 150,000 images as test set, the model for using at that time
Layer, first 5 layers is convolutional layer, and afterwards three layers is full articulamentum, and deep learning framework caffe is exactly according to this model realization
Open Framework, the deep learning Open Framework that we use in the present invention is exactly caffe.
The content of the invention
The purpose of the present invention is exactly to overcome the shortcomings of that artificial cognition sensitive image is wasted time and energy, there is provided one kind is based on deep
The method of degree study, improves the efficiency of nude picture detection.
The nude picture detection method based on deep learning that the present invention is provided, concretely comprises the following steps:
Step 1, from collect sensitive image data base in extract sensitive image information;
Step 2, sensitive image information is trained before pretreatment;
Step 3, training set and test set will be divided into through pretreated whole sensitive images;
Step 4, the training that training set is used for deep neural network (DNN);
The neutral net of step 5, the training result initialization test of deep neural network (DNN);
Step 6, the identification test that the neutral net that test set is input to after initialization is carried out sensitive image.
Wherein:
In step 2, the pretreatment of sensitive image, including:
Each sub-picture in sensitive image data base is sampled, and extracts the part containing sensitive information, while will
Image is converted into jpg forms, is scaled 256*256 sizes, generates the text of image path/label form, then out of order arrangement
Information in text.
In step 4, the training of depth convolutional neural networks (DNN), including:
The training of depth convolutional neural networks has two kinds of forms, pre-training (pre-training) and tuning (fine-
Tuning), the time loss of pre-training is longer, and it cannot be guaranteed that training model can restrain, so the present invention adopts tuning
Formal discipline model, the model initialization neutral net that fine-tuning is trained using identical network, then according to training
Parameter between sample fine setting neutral net, increases the learning capacity to training sample, and the time not only trained is shorter, Er Qieke
To ensure convergence.
Step 5 kind, tests the initialization of neutral net, including:
The neutral net of test is identical with the neural network structure of training, last layer network softmax outputs
It is probability that test image belongs to each classification.Initialization test network, exactly by the deep neural network after training
Each layer of hidden layer network weight weight values, be directly transmitted to test network equivalent layer so that test network and training model
With identical hidden layers numbers, the number of hidden nodes and each layer of network weight weight values.
In step 6, the output of nude picture detection result, including:
For the sample in sensitive image test set, carried out using deep neural network (DNN) model after initialization
The identification test of sensitive image, exports the result of nude picture detection.The characteristics of here with softmax layers, softmax layers
The n-dimensional vector of output is the probability that test image belongs to each classification, so, correspond in the maximum subscript of n-dimensional vector intermediate value
Corresponding that classification of label in training sample.
The tuning (fine-tunning) of depth convolutional neural networks (DNN) of the present invention, including:Using from top
The method of downward supervised learning is learnt and tuning, i.e., be trained using the sample data that has label, error from push up to
Lower transmission, to network tuning is carried out.After tuning so that each layer of hidden layer of depth convolutional neural networks (DNN) model
Network weight weight values can be optimal value.Concrete tuning (fine-tuning) process is as follows:
According to input data and the error function of output result, the weighted value of network is updated using back-propagation algorithm, made
Obtain network and reach global optimum.Cost function between input data and output result is:
The purpose of weight attenuation parameter λ is two impact proportions to total cost in control formula.Wherein:J(W,b;x,y)
It is single sample (x(i),y(i)) calculated cost function;J (W, b) be whole samples cost function, it contains weight and declines
Deduction item.
Gradient descent method mainly updates weight parameter W and offset parameter b, and the formula of calculating is as follows:
First, need to be calculated using back-propagation algorithm before calculatingWith
This two, this two be single sample input (x, y) cost function J (W, b;X, y) partial derivative.The partial derivative is obtained, so
Overall cost function J (W, partial derivative b) are calculated afterwards:
In the formula, above formula is one more than following formula, because weight decay will act on weight parameter W rather than bias b.
The main thought of back-propagation algorithm is as follows:
Input sample (x, y), calculates according to forward methods, obtains all of activation value, i.e. h in networkW,b(x)It is defeated
Go out value.Afterwards for each node i of l layers, calculate its " residual error "Difference i.e. between output valve and desired value.
Last output node is exactly the corresponding label of training sample due to desired value, and the residual error of calculating is(value is known
).For hidden unit, will be calculated based on the weighted mean of node (l+1 node layers) residual errorThese nodes with
As input.The details of reverse conduction algorithm is presented below:
1st, forward conduction calculating is carried out, using forward conduction formula, is calculated L2, L3... until output layer LnlSwash
Value living.
2nd, for each output unit i of the n-th l layers (output layer), residual error is calculated according to below equation:
3rd, to l=nl-1, nl-2, nl-3 ..., 2 each layer, the residual computations method of i-th node of l layers is such as
Under:
4th, the partial derivative for needing is calculated, computational methods are as follows:
5th, according to above method, iteration is reducing cost function J (W, value b), and then solve neutral net
Parameter.
Compared with prior art, advantages of the present invention and effect have:
1st, for the extraction of sensitive features, directly using the original pixels characteristic information of sensitive image, method is simple, is not required to
Want artificial design feature.
2nd, using depth convolutional neural networks, it is to avoid the artificial design feature of traditional pattern recognition, deep learning is learned automatically
Practise effective feature.
3rd, by regulation parameter and Optimized model, the feature learning ability of depth convolutional neural networks is given full play to, there is provided
A kind of method of the high performance nude picture detection based on deep learning
4th, the present invention increased incremental training on the basis of tuning (fine-tuning), continue in the model for training
Upper increase sample continues to train, and strengthens the learning capacity to sensitive image.
Description of the drawings
Fig. 1 is the nude picture detection training pattern and the block diagram of nude picture detection based on deep learning.
Fig. 2 is neural network diagram.
Specific embodiment
Technical scheme of the present invention is further illustrated below.
1st, sensitive image information is extracted from the sensitive image data base for collecting, is mainly cut out containing in sensitive image
The part of sensitive information, reduces the impact of noise components.
2nd, the pretreatment operation before being trained to sensitive image information, is mainly converted into jpg format-patterns by image,
It is 256*256 sizes by image scaling, ultimately produces the text of image path/label (0,1,2...m) form.
3rd, training set and test set will be divided into through pretreated whole sensitive images, i.e., according to training set:Test set
About 10:All images are divided into training set and test set by 1 ratio
The 4th, training set is used for the training of deep neural network (DNN), is provided using deep learning Open Framework caffe
Teaching interface, starts training pattern.
5th, sensitive image test, specifically, the input image to be recognized, using model initialization neutral net, through god
The computing of Jing networks, finally exports the result of identification.
List of references:
[1]Krizhevsky A,Sutskever I,Hinton G E.ImageNet Classification with
Deep Convolutional Neural Networks[J].Advances in Neural Information
Processing Systems,2012,25(2):2012.
[2]Chen Y,Lin Z,Zhao X,et al.Deep Learning-Based Classification of
Hyperspectral Data[J].IEEE Journal of Selected Topics in Applied Earth
Observations&Remote Sensing,2014,7(6):2094-2107.
[3]Levy E,David O E,Netanyahu N S.Genetic algorithms and deep
learning for automatic painter classification[C]//Conference on Genetic&
Evolutionary Computation.ACM,2014:1143-1150.
[4]An X,Kuang D,Guo X,et al.A Deep Learning Method for Classification
of EEG Data Based on Motor Imagery[M]//Intelligent Computing in
Bioinformatics.2014:203-210.
[5] Kang Xiaodong, Wang Hao, Guo Jun, etc. unsupervised deep learning color image recognition method [J]. computer utility,
2015,35(9):2636-2639.
[6]Marmanis D,Datcu M,Esch T,et al.Deep Learning Earth Observation
Classification Using ImageNet Pretrained Networks[J].IEEE Geoscience&Remote
Sensing Letters,2015,13(1):1-5.
[7]Ji Wan,Dayong Wang,Steven C.H.Hoi,Pengcheng Wu,Jianke Zhu,Yongdong
Zhang,Jintao Li.Deep Learning for Content-Based Image Retrieval:A
Comprehensive Study.2014。
Claims (2)
1. the nude picture detection method of deep learning is based on, it is characterised in that concretely comprised the following steps:
Step 1, from collect sensitive image data base in extract sensitive image information;
Step 2, sensitive image information is trained before pretreatment;
Step 3, training set and test set will be divided into through pretreated whole sensitive images;
Step 4, the training that training set is used for deep neural network;
The neutral net of step 5, the training result initialization test of deep neural network;
Step 6, the identification test that the neutral net that test set is input to after initialization is carried out sensitive image;
Wherein:
In step 2, the pretreatment of sensitive image, including:
Each sub-picture in sensitive image data base is sampled, and extracts the part containing sensitive information, while by image
Jpg forms are converted into, 256*256 sizes are scaled, the text of image path/label form is generated, then out of order arrangement text
In information;
In step 4, the training of depth convolutional neural networks, using the formal discipline model of tuning, tuning is instructed using identical network
The model initialization neutral net perfected, then finely tunes the parameter between neutral net according to training sample, increases to training sample
This learning capacity;
In step 5, the initialization of neutral net is tested, the neutral net of test is identical with the neural network structure of training,
What last layer network softmax was exported is the probability that test image belongs to each classification;Initialization test network, being exactly will instruction
The network weight weight values of each layer of hidden layer in the deep neural network after perfecting, are directly transmitted to test network equivalent layer, so as to
So that test network and the model of training have identical hidden layers numbers, the number of hidden nodes and each layer of network weight weight values;
In step 6, for the sample in sensitive image test set, carried out using the deep neural network model after initialization quick
The identification test of sense image, exports the result of nude picture detection, the characteristics of here with softmax layers, the output of softmax layers
N-dimensional vector be probability that test image belongs to each classification, so, correspond to training in the maximum subscript of n-dimensional vector intermediate value
Corresponding that classification of label in sample.
2. the nude picture detection method based on deep learning according to claim 1, it is characterised in that be depth volume
The tuning of product neutral net, is learnt and tuning using the method for top-down supervised learning, i.e., using the sample for having label
Notebook data is trained, the top-down transmission of error, and to network tuning is carried out;After tuning so that depth convolutional Neural
The network weight weight values of each layer of hidden layer of network model can be optimal value;Concrete evolutionary process is as follows:
According to input data and the error function of output result, the weighted value of network is updated using back-propagation algorithm so that net
Network reaches global optimum;Cost function between input data and output result is:
(1)
Wherein,Weight attenuation parameter, for controlling formula in two impact proportions to total cost;
It is single sampleCalculated cost function;It is the cost function of whole samples, it contains weight and declines
Deduction item;
Using gradient descent method, for updating weight parameterAnd offset parameter, the formula of calculating is as follows:
(2)
(3)
Need to be calculated using back-propagation algorithm before calculatingWithThis two, this two
Item is single sample inputCost functionPartial derivative;Then overall cost function is calculatedPartial derivative:
(4)
Described back-propagation algorithm is:Input sample, it is calculated according to forward methods all of sharp in network
Value living, i.e.,Output valve;Afterwards for each node i of l layers, calculate its " residual error ", i.e., output valve and
Difference between desired value;Last output node is exactly the corresponding label of training sample due to desired value, and the residual error of calculating is;For hidden unit, the weighted mean of residual error for based on node being l+1 node layers is calculated, these nodes withAs input;
The idiographic flow of reverse conduction algorithm is:
(1)Forward conduction calculating is carried out, using forward conduction formula, is calculatedUntil output layerActivation
Value;
(2)ForLayer is each output unit i of output layer, and according to below equation residual error is calculated:
;
(3)It is rightEach layer, the residual computations of i-th node of l layers are as follows:
;
(4)Calculate the partial derivative for needing:
;
(5)According to above method, iteration is reducing cost functionValue, and then solve neutral net ginseng
Number.
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