CN110728252A - Face detection method applied to regional personnel motion trail monitoring - Google Patents

Face detection method applied to regional personnel motion trail monitoring Download PDF

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CN110728252A
CN110728252A CN201911005541.2A CN201911005541A CN110728252A CN 110728252 A CN110728252 A CN 110728252A CN 201911005541 A CN201911005541 A CN 201911005541A CN 110728252 A CN110728252 A CN 110728252A
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乔鹏
程保喜
王浩
唐人宇
毛丽霞
王嘉
张炯
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Shanxi Information Industry Technology Research Institute Co Ltd
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Abstract

The invention relates to a face detection method applied to regional personnel motion trail monitoring, belonging to the technical field of face detection; the technical problem to be solved is as follows: the improvement of a human face detection method applied to the monitoring of the movement track of regional personnel is provided; the technical scheme for solving the technical problem is as follows: setting a video analysis service program in a server, deploying a face recognition algorithm, and capturing an image by the face recognition algorithm through a network camera to be a photo or a video; inputting the face data of the active personnel in the area into a server, and establishing a white list face library; each network camera is used for monitoring the personnel flow conditions at different positions in the area, and acquiring and storing the face images of the personnel independently, a program arranged in the server analyzes and processes the data, and compares the identified face image data with a white list face library to determine which registered personnel appear in which network camera in the corresponding time period; the invention is applied to monitoring the movement track of the personnel.

Description

Face detection method applied to regional personnel motion trail monitoring
Technical Field
The invention discloses a face detection method applied to regional personnel motion trail monitoring, and belongs to the technical field of face detection.
Background
With the high-speed development of information technology, the application of Artificial Intelligence (AI) is pushed to a new height, and the use fields of AI technology are more and more, from medical diagnosis, industrial automation, financial investment, intelligent home furnishing and transportation, from groups to individuals; the most important application is face recognition, and the technology is continuously improved and developed, is already put into practical use at present and is applied to various large information security fields such as transportation, intelligent security, image retrieval, identity verification and the like.
The face recognition technology is applied to the field of monitoring regional personnel, the monitoring efficiency can be effectively improved, and the following method is mainly adopted for detecting the motion track of the regional personnel at present: the method comprises the steps that a certain number of positioning base stations are installed in an area where the base stations are located, so that base station signals can cover the whole area needing positioning, personnel to be monitored are arranged to wear positioning labels, the personnel wearing the positioning labels can be monitored and positioned after entering the area, and the position distribution of managed personnel can be monitored on a map of a supervision center; the face characteristics of the personnel under the label name need to be collected by a camera for judging the identity of the personnel, the existing human face recognition algorithm is used for recognition, the face recognition accuracy and efficiency are not ideal all the time due to the influence of various factors such as face characteristic change, complex background environment and the like, and the data processing of a corresponding control module is delayed due to the fact that a calculation method is not optimized enough.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to solve the technical problems that: the improvement of the human face detection method applied to the regional personnel motion trail monitoring is provided.
In order to solve the technical problems, the invention adopts the technical scheme that: a face detection method applied to regional personnel motion trail monitoring comprises the following steps:
the method comprises the following steps: installing a network camera in an area to be monitored, installing a deployment data processing server in a monitoring room, wherein a display screen and a control keyboard are arranged on the server, a video analysis service program is arranged in the server, and a face recognition algorithm is deployed, and images collected by the face recognition algorithm are captured into photos or videos by the network camera;
step two: inputting the face data of the active personnel in the area into a server, and establishing a white list face library; in the using process, simultaneously storing the face data of the persons not in the white list, and establishing a non-admittance person face library;
step three: starting a detection system, wherein each network camera is used for monitoring personnel flow conditions at different positions in an area and independently collecting and storing face images of the personnel, each network camera feeds back collected face image data to a server, a program built in the server analyzes and processes the data, the identified face image data is compared with a white list face library, and which registered personnel appear in which network camera in a corresponding time period is confirmed;
step four: the server displays the action track of the personnel on a display screen and stores the data log into a data storage module.
The specific steps of the server in the third step of processing the received face image are as follows:
step 3.1: firstly, carrying out data preprocessing on an acquired face image to reduce the complexity of the whole image;
step 3.2: the adjusted Gamma algorithm is adopted to adjust the color of the preprocessed image, the face mask is obtained, the original image is firstly processed with reverse color, then the Gaussian fuzzy processing with a certain radius is carried out, and the calculation formula is as follows:
γ[i,j,N(i,j)]＝α[128-BFmask(i，j)/128]；
and satisfies the following conditions:
Figure BDA0002242651120000021
the mask in the above formula adopts a two-dimensional gaussian mask,
Figure BDA0002242651120000022
is a constant number of times that the number of the first and second,
Figure BDA0002242651120000023
are all coordinates in a two-dimensional space,
Figure BDA0002242651120000024
is the coordinate of any point within the mask,
Figure BDA0002242651120000025
coordinates of the center of the mask;
in the above formula, σ is 1.0, and the gaussian mask can be obtained by normalizing the data;
step 3.3: adopting an AdaBoost algorithm to detect the face, and labeling the specific position of the face:
step 3.3.1: annotated set of images S { (I)1，ωl)，(I2，ω2)，(I3，ω3)，…，(Inωn) Where ω isnE { -1, 1}, which represents whether the image has a face;
setting an initial weight mul，i1/2m or 1/2l each correspond to μjNegative and positive sample cases of (j ═1 … n, l corresponds to the number of negative and positive samples, let k equal to 1;
step 3.3.2: mu tol，iNormalizing to generate probability distribution;
step 3.3.3: each feature riTrain a classifier hiEvaluating the error rate, selecting the best hkError is ek；
Step 3.3.4: order to
Figure BDA0002242651120000026
Wherein tau isk＝ek/(l-ek)，ρj0, l corresponds to IjIs classified as either false or correct;
step 3.3.5: increasing the value of K, and repeatedly executing the step 3.3.2 until K is equal to K, wherein K is a pre-specified range;
step 3.3.6: the following classifiers were used:
Figure BDA0002242651120000027
wherein a isk＝-logτk；
Training a batch of simple classifiers, acting on different training samples each time, and finally integrating the classifiers in a cascading manner to form a strong classifier and marking coordinates of each characteristic position of the face;
step 3.4: extracting texture features of face information in the image by adopting LBP (local binary pattern) method: before extracting texture features, carrying out blocking processing on an image, independently calculating an LBP value of each block, and then summarizing all block histogram features into a complete LBP feature histogram; calculating the characteristic values of different radii and different pixel points by using a circular LBP operator, wherein the formula of the circular LBP operator with the calculation scale of (P, R) is as follows:
in the above formula, gi-gjRepresenting a difference between the ith field and the central pixel value;
step 3.5: the face recognition is carried out by utilizing the convolutional neural network, the relation between the depth and the performance of the convolutional neural network is explored according to the VGGNet model structure, and the data conversion is carried out by the following formula so as to reduce the passive influence of the factors such as expression and posture on the face recognition:
Figure BDA0002242651120000032
in the above formula, the first and second carbon atoms are,
Figure BDA0002242651120000033
for the final recognition result data to be acquired,
Figure BDA0002242651120000034
for the weight matrix, f (x) is the activation function,
Figure BDA0002242651120000035
is an offset value.
Compared with the prior art, the invention has the beneficial effects that: the invention provides an improved human face data recognition processing method which can be applied to the action tracks of monitored personnel, comprehensively considers human face recognition algorithm and outdoor environment interference factors by means of computer graphics, big data analysis and other technologies, correspondingly improves the recognition algorithm of collected human face images, effectively improves the positioning and track monitoring efficiency and accuracy, can quickly confirm the identity of a target by being applied to a regional personnel action track monitoring system, and can track and check historical track data of corresponding personnel.
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The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic structural diagram of a face detection system for monitoring movement tracks of regional personnel according to the present invention;
FIG. 2 is a flow chart illustrating the steps of data processing of a face image according to the present invention;
FIG. 3 is a LBP histogram of image extraction during processing of image data according to the present invention;
FIG. 4 is a block diagram of the present invention employing a convolutional neural network in processing image data.
Detailed Description
As shown in fig. 1, the detection method of the present invention requires setting corresponding hardware, including a Linux server with a GPU for deploying a face recognition algorithm and a video parsing service program, a web camera for identifying people and capturing faces, and a person who can be analyzed and identified by the video parsing service; a management server for managing the application programs.
According to the invention, a camera is used for collecting the face image of a monitored person in an area, and a recognition algorithm is carried out on the face image data; because the face recognition accuracy depends on the optimization degree of the face recognition algorithm and the quality and quantity of the face samples prestored in the database, and the face samples of the same person under different environmental conditions are different, the quality of the collected face samples can be influenced by the inclusion of illumination intensity or complex background images, and the recognition rate is reduced. Therefore, the acquired portrait picture is preprocessed before the acquired image is analyzed, and the complexity of the image is reduced as much as possible.
The structure of a face image recognition core algorithm used by the system is shown in fig. 2, a face photo is derived from a collected picture, the collected picture is adjusted in color by an improved Gamma algorithm, then face detection is carried out by using an AdaBoost algorithm, a detected face is marked, texture features are extracted from a corresponding calculation result by using LBP, and finally face recognition is carried out by using a convolutional neural network to obtain a final recognition result.
The Gamma algorithm adopted by the application is improved, the identification accuracy can be improved, the human face state of pedestrians in the area can have large difference due to different positions, and the existing Gamma algorithm is limited.
The method improves the Gamma algorithm and improves the image identification accuracy.
γ[i，j，N(i，j)]＝α[128-BFmask(i，j)/128]As formula 1;
the obtaining principle of the mask is as follows: firstly, the original image is subjected to reverse color processing, and then Gaussian blur processing with a certain radius is performed.
Here the mask uses a two-dimensional gaussian mask,it is only a constant number that is,
Figure BDA0002242651120000042
are essentially coordinates in two-dimensional space,
Figure BDA0002242651120000044
is the coordinate of any point within the mask,
Figure BDA0002242651120000045
is the coordinate of the center of the mask (statistically called mean, i.e., the mean of the coordinates);
Figure BDA0002242651120000043
as formula 2;
the coordinate matrix is represented as:
Figure BDA0002242651120000049
wherein (x, y) in the middle of the matrix is in the formula
Figure BDA0002242651120000046
When in use
Figure BDA0002242651120000047
In traversing (x-1, y-1.) (x +1, y +1),the satisfied matrix data is:
0.3679、0.6065、0.3679
0.6065、1.000、0.6065
0.3679、0.6065、0.3679
then, taking σ as 1.0, normalizing to obtain a gaussian mask, and obtaining data results as follows:
0.075、0.124、0.075
0.124、0.204、0.124
0.075、0.124、0.075
before LBP (local binary pattern) feature extraction, the image needs to be subjected to blocking processing, the LBP value of each block is calculated independently, and then histogram features of all blocks are gathered into a complete LBP feature histogram; in order to adapt to the texture characteristics of various scales, the circular domain is adopted to replace the LBP operator in the square domain, namely the circular LBP operator, so that the requirements of gray scale invariance and rotation invariance are met. Therefore, the light interference can be resisted, and the interference of the expression on the face recognition can be improved.
The circular LBP operator can calculate the characteristic values of different radius sizes and different pixel points.
The circle computation LBP operator formula for the scale (P, R) is as follows:
Figure BDA0002242651120000051
wherein g isi-gjRepresenting the difference between the ith field and the central pixel value, which can be calculated to 2PA number of different LBP codes.
After the LBP operator is coded according to the LBP operator, certain subtle characteristics are still defective; therefore, before calculating the above-mentioned codes, the images are divided into blocks, the LBP histogram is extracted for each image, and finally they are connected in order to form the LBP features of the picture, as shown in fig. 3;
the method adopts AdaBoost face positioning steps as follows:
the method comprises the following steps: annotated set of images S { (I)1，ω1)，(I2，ω2)，(I3，ω3)，…，(Inωn) Where ω isnAnd e { -1, 1}, which represents whether the image has a human face. Initial weight mul，i1/2m or 1/2l each correspond to μjJ is 1 … n, l corresponds to the number of negative and positive samples, let k be 1;
step two: mu tol，iNormalizing to generate probability distribution;
step three: each feature riTrain a classifier hiEvaluating the error rate, selecting the best hkError is ek；
Step four: order to
Figure BDA0002242651120000052
Wherein tau isk＝ek/(1-ek)，ρi{0, 1} corresponds to IjIs classified as either false or correct;
step five: increasing the value of K, and continuing to execute the second step until K is equal to K, wherein K is a pre-specified range;
step six: the following classifiers were used:
Figure BDA0002242651120000053
wherein a isk＝-logτk；
The missing detection rate of the weak classifiers is reduced, but the false judgment rate is increased, then a complex classifier, namely a strong classifier, is applied to a small part of results which are not eliminated, namely a batch of simple classifiers are trained firstly, each time, different training samples are acted on, and finally, the classifiers are integrated in a cascading mode to form a strong classifier. It resembles a decision tree, with classifier n +1 being called only if classifier n is not excluded.
According to the relationship between the depth and performance of the convolutional neural network explored by VGGNet, the network structure adopted is shown in fig. 4, and comprises 3 layers of convolution kernels, 32 convolution kernels of 2x2, 64 convolution kernels of 2x2 and 96 convolution kernels of 2x2, which are connected by a nonlinear activation function;
3 pooling layers are arranged in the network structure, and are all 2x2 max-posing, so that the passive influence of expressions, postures and the like on the face can be reduced;
finally, through the full connection layer, the weight matrix
Figure BDA0002242651120000062
Activating function f (x), bias value
Figure BDA0002242651120000063
Obtaining the final feature vector
Figure BDA0002242651120000064
Calculating the characteristic vector by the following formula:
Figure BDA0002242651120000061
when the system is used, corresponding hardware of the detection system is installed in a specific area, so that artificial intelligence application taking face recognition as a core is improved, the identity of a target is quickly confirmed, intelligent, accurate and quick face comparison and perfect video image big data analysis mining application are provided, personnel management monitoring applications such as real-time face tracking monitoring early warning, personnel identity quick comparison retrieval approval, personnel historical track tracking and reverse checking and the like are comprehensively solved, and personnel management monitoring applications such as person searching, person finding, early warning, tracking and the like are provided, and the detection system is different from the existing personnel motion track system.
The detection system can also integrate the functions of video images, electronic maps, positioning monitoring, personnel attendance checking, personnel distribution, electronic fences, monitoring alarm and the like at the later stage, has stronger practicability, and identifies and triggers alarm for various actions such as crossing warning surfaces, regional invasion, entering regions, leaving regions and the like; through the association of the video monitoring system and other auxiliary systems, rich video plans including television wall linkage, alarm video recording and the like can be provided, and the method is beneficial to relevant departments to find accident points at the first time, quickly react and control accident loss to the minimum range; the system adds a plurality of preset positions of a plurality of monitoring points along the way into a plan, once the problems are found, screenshots can be taken and marked, and related departments are informed in time, so that the plan can greatly improve the inspection quality and the arrival rate.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (2)

1. A face detection method applied to regional personnel motion trail monitoring is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: installing a network camera in an area to be monitored, installing a deployment data processing server in a monitoring room, wherein a display screen and a control keyboard are arranged on the server, a video analysis service program is arranged in the server, and a face recognition algorithm is deployed, and images collected by the face recognition algorithm are captured into photos or videos by the network camera;
step two: inputting the face data of the active personnel in the area into a server, and establishing a white list face library; in the using process, simultaneously storing the face data of the persons not in the white list, and establishing a non-admittance person face library;
step three: starting a detection system, wherein each network camera is used for monitoring personnel flow conditions at different positions in an area and independently collecting and storing face images of the personnel, each network camera feeds back collected face image data to a server, a program built in the server analyzes and processes the data, the identified face image data is compared with a white list face library, and which registered personnel appear in which network camera in a corresponding time period is confirmed;
step four: the server displays the action track of the personnel on a display screen and stores the data log into a data storage module.
2. The face detection method applied to regional personnel motion trail monitoring according to claim 1, characterized in that: the specific steps of the server in the third step of processing the received face image are as follows:
step 3.1: firstly, carrying out data preprocessing on an acquired face image to reduce the complexity of the whole image;
step 3.2: the adjusted Gamma algorithm is adopted to adjust the color of the preprocessed image, the face mask is obtained, the original image is firstly processed with reverse color, then the Gaussian fuzzy processing with a certain radius is carried out, and the calculation formula is as follows:
γ[i，j，N(i，j)]＝α[128-BFmask(i，j)/128]； (1)
and satisfies the following conditions:
Figure FDA0002242651110000011
the mask in the above formula adopts a two-dimensional gaussian mask,
Figure FDA0002242651110000012
is a constant number of times that the number of the first and second,
Figure FDA0002242651110000013
are all coordinates in a two-dimensional space,
Figure FDA0002242651110000014
is the coordinate of any point within the mask,is the coordinate of the mask center;
in the above formula, σ is 1.0, and the gaussian mask can be obtained by normalizing the data;
step 3.3: adopting an AdaBoost algorithm to detect the face, and labeling the specific position of the face:
step 3.3.1: annotated set of images S { (I)1，ω1)，(I2，ω2)，(I3，ω3)，…，(Inωn) Where ω isnE { -1, 1}, which represents whether the image has a face;
setting an initial weight mul，i1/2m or 1/21 m respectivelyCorresponds to μjJ is 1 … n, l corresponds to the number of negative and positive samples, let k be 1;
step 3.3.2: mu tol，iNormalizing to generate probability distribution;
step 3.3.3: each feature riTrain a classifier hiEvaluating the error rate, selecting the best hkError is ek；
Step 3.3.4: order to
Figure FDA0002242651110000021
Wherein tau isk＝ek/(1-ek)，ρi{0, 1} corresponds to IjIs classified as either false or correct;
step 3.3.5: increasing the value of K, and repeatedly executing the step 3.3.2 until K is equal to K, wherein K is a pre-specified range;
step 3.3.6: the following classifiers were used:
wherein a isk＝-logτk；
Training a batch of simple classifiers, acting on different training samples each time, and finally integrating the classifiers in a cascading manner to form a strong classifier and marking coordinates of each characteristic position of the face;
step 3.4: extracting texture features of face information in the image by adopting LBP (local binary pattern) method: before extracting texture features, carrying out blocking processing on an image, independently calculating an LBP value of each block, and then summarizing all block histogram features into a complete LBP feature histogram; calculating the characteristic values of different radii and different pixel points by using a circular LBP operator, wherein the formula of the circular LBP operator with the calculation scale of (P, R) is as follows:
in the above formula, gi-gjIs shown asThe difference of the i fields from the central pixel value;
step 3.5: the face recognition is carried out by utilizing the convolutional neural network, the relation between the depth and the performance of the convolutional neural network is explored according to the VGGNet model structure, and the data conversion is carried out by the following formula so as to reduce the passive influence of the factors such as expression and posture on the face recognition:
Figure FDA0002242651110000024
in the above formula, the first and second carbon atoms are,
Figure FDA0002242651110000025
for the final recognition result data to be acquired,for the weight matrix, f (x) is the activation function,
Figure FDA0002242651110000027
is an offset value.
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CN111553386A (en) * 2020-04-07 2020-08-18 哈尔滨工程大学 AdaBoost and CNN-based intrusion detection method
CN112016526A (en) * 2020-10-16 2020-12-01 金税信息技术服务股份有限公司 Behavior monitoring and analyzing system, method, device and equipment for site activity object
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CN112364722A (en) * 2020-10-23 2021-02-12 岭东核电有限公司 Nuclear power operator monitoring processing method and device and computer equipment
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