CN113676704B - Arrangement method of barrier delivery cameras - Google Patents
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- CN113676704B CN113676704B CN202110968251.9A CN202110968251A CN113676704B CN 113676704 B CN113676704 B CN 113676704B CN 202110968251 A CN202110968251 A CN 202110968251A CN 113676704 B CN113676704 B CN 113676704B
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- 230000004888 barrier function Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000003384 imaging method Methods 0.000 claims abstract description 35
- 230000000007 visual effect Effects 0.000 claims abstract description 24
- 230000000694 effects Effects 0.000 claims abstract description 21
- 238000009434 installation Methods 0.000 claims abstract description 20
- 238000004364 calculation method Methods 0.000 claims abstract description 18
- 238000004088 simulation Methods 0.000 claims abstract description 18
- 238000007689 inspection Methods 0.000 abstract description 49
- 238000012544 monitoring process Methods 0.000 abstract description 14
- 238000012546 transfer Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
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Abstract
The invention discloses a method for arranging barrier delivery cameras, which comprises the following steps: acquiring plane distribution information of security check areas of different types of station sites, and determining the position of a visual field blind area of a security inspector; according to the camera mounting information, calculating the declination angle of the camera by using a camera vertical view field angle calculation formula; establishing a simulation arrangement model according to the plane distribution information of the security check area and the position information of the visual field blind area of the security check person, importing the parameter information of the camera into the simulation arrangement model for simulation imaging, and determining the installation position of the camera; and judging the simulated imaging effect according to a preset imaging standard, and fine-adjusting the installation position of the camera according to the judging result until the simulated imaging effect meets the preset imaging standard. According to the invention, the camera mounting position in the actual security inspection area is determined by simulating and arranging the camera imaging in advance, so that the monitoring of the visual field blind area of the security inspector in the security inspection area is realized, passengers are prevented from delivering packages which do not pass the security inspection into the security inspection area, and risks are avoided.
Description
Technical Field
The invention relates to the technical field of subway safety inspection, in particular to a barrier transfer camera arrangement method for subway safety inspection.
Background
All passengers entering the subway are allowed to enter after the subway security check office has no exception. That is, subway security inspection does not have any special inspection-free object. All personnel entering the subway must accept the subway security check.
In the existing subway security inspection scene, the installation of the monitoring camera needs to be determined according to the visual field coverage of the security inspector and the information of the station position of the security inspector, the length of the security inspection area and the like, the installation is complicated, the imaging effect of the camera is easily influenced by the station height and the factors of camera equipment, the installation position of the camera needs to be adjusted, or the equipment quantity is increased to solve the problem of blind areas, and the equipment cost is increased while the time and the labor are wasted.
In addition, in the existing security inspection point, because the security inspector has a visual field blind area, partial passengers deliver the objects which are not subjected to security inspection into the security inspection area at the visual field blind area of the security inspector, and the risk of object missing inspection exists.
The patent with the application number of CN202010299987.7 discloses a method, a system and a medium for arranging the selective points of monitoring cameras of primary equipment of an outdoor transformer substation, the technical scheme comprises the steps of respectively generating various camera selective point arrangement schemes according to equipment monitoring sites and the orientation requirements of the equipment monitoring sites, wherein the camera selective point arrangement schemes comprise a plurality of camera selective points, a lens coefficient N corresponding to each camera selective point and a monitoring area S; for each camera point selection arrangement scheme, the lens coefficients N and the monitoring areas S of the camera points selection in the camera point selection arrangement scheme are respectively accumulated, and the optimal camera point selection arrangement scheme is selected according to the mode that the accumulation sum of the lens coefficients N is selected to be minimum preferentially and the accumulation sum of the monitoring areas S is selected to be maximum secondarily. According to the technical scheme, although all monitoring sites can be guaranteed to be included in monitoring, the minimum installation quantity and the maximum monitoring area are met, and the maintenance workload of the cameras is reduced, the technical scheme cannot be directly applied to subway riding security inspection scenes, errors of actual scenes and arrangement schemes are not considered, and the arrangement schemes are not adaptively adjusted, so that the actual arrangement effect is required to be improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a barrier delivery camera arrangement method, which is used for determining the installation position of a camera in an actual security inspection area by simulating and arranging camera imaging in advance, so as to realize the monitoring of a visual field blind area of a security inspector in a security inspection area, prevent passengers from delivering packages which do not pass security inspection into the security inspection area and avoid risk.
The aim of the invention is realized by the following technical scheme:
a barrier delivery camera arrangement method comprises the following steps:
step one: acquiring plane distribution information of security check areas of different types of station sites, and determining the position of a visual field blind area of a security inspector in the plane distribution information of the security check areas;
step two: according to the camera mounting information, calculating the declination angle of the camera by using a camera vertical view field angle calculation formula;
step three: establishing a simulation arrangement model according to plane distribution information of the security check area and position information of a visual field blind area of the security check person, introducing camera parameter information and the calculated declination angle of the camera into the simulation arrangement model for simulation imaging, and determining the installation position of the camera; and judging the simulated imaging effect according to a preset imaging standard, and fine-adjusting the installation position of the camera according to the judging result until the simulated imaging effect meets the preset imaging standard.
Specifically, the station site security check areas of different types in the first step comprise security check areas at the positions of the two security check points of the standard station, the security check areas at the positions of the two security check points of the standard station, and the security check areas at the positions of the two security check points of the L-shaped security check points, the security check areas at the positions of the two security check points of the standard station, the security check areas at the positions of the two security check points, and the security check areas at the positions of the entrance rail, the two rail, wherein the security check areas are 10 meters.
Specifically, the camera mounting information in the second step includes a camera mounting height h1 and a furthest-end height h2 of the angle of view on the camera.
Specifically, the calculation formula of the vertical view field angle of the camera in the second step is as follows:
v is the vertical view field angle of the camera lens, and v is smaller than 90 degrees; h1 is the mounting height of the camera; h2 is the most far-end height of the angle of view on the camera; d is the length of the coverage area of the camera; x is the downward inclination angle of the camera.
Specifically, the second step further includes calculating a camera blind area L, where the calculating process is shown in the following formula:
wherein L is the length of a blind area of the camera; x is the declination angle of the camera; h1 is the mounting height of the camera.
Specifically, the camera is a Haikang Wei DS-2CD702XYZUV-ABCDEF gun camera, the lens is a HV3816D-8MPIR lens, and DS-1341HZ indoor protection is adopted for installation and fixation.
The invention has the beneficial effects that: according to the invention, the camera mounting position in the actual security inspection area is determined by simulating and arranging the camera imaging in advance, so that the monitoring of the visual field blind area of the security inspector in the security inspection area is realized, passengers are prevented from delivering packages which do not pass the security inspection into the security inspection area, and risks are avoided.
Drawings
Fig. 1 is a flow chart of the method of the present invention.
Fig. 2 is a view of the coverage of the camera of the present invention.
FIG. 3 is a diagram of the deployment of the standard 25-45 m station barrier camera of the present invention.
FIG. 4 is a diagram of the deployment of the standard 45-65 meter station barrier camera of the present invention.
FIG. 5 is a diagram of the deployment of the 65-85 meter standard station barrier camera of the present invention.
Detailed Description
In order to make the technical features, objects and effects of the present invention more clearly understood, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments of the present invention.
All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
in this embodiment, as shown in fig. 1, a method for arranging barrier delivery cameras includes the following steps:
step one: acquiring plane distribution information of security check areas of different types of station sites, and determining the position of a visual field blind area of a security inspector in the plane distribution information of the security check areas;
step two: according to the camera mounting information, calculating the declination angle of the camera by using a camera vertical view field angle calculation formula;
step three: establishing a simulation arrangement model according to plane distribution information of the security check area and position information of a visual field blind area of the security check person, introducing camera parameter information and the calculated declination angle of the camera into the simulation arrangement model for simulation imaging, and determining the installation position of the camera; and judging the simulated imaging effect according to a preset imaging standard, and fine-adjusting the installation position of the camera according to the judging result until the simulated imaging effect meets the preset imaging standard.
Specifically, the station site security check areas of different types in the first step comprise security check areas at the positions with the linear distance of 15-25 meters between the security check doors of the two security check points of the standard station, security check areas at the positions with the linear distance of 25-85 meters between the security check doors of the two security check points of the standard station, and security check areas from the security check doors of the L-shaped security check points to the positions of 10 meters of the gate rail.
Specifically, the camera mounting information in the second step includes a camera mounting height h1 and a furthest-end height h2 of the angle of view on the camera.
Specifically, the calculation formula of the vertical view field angle of the camera in the second step is as follows:
v is the vertical view field angle of the camera lens, and v is smaller than 90 degrees; h1 is the mounting height of the camera; h2 is the most far-end height of the angle of view on the camera; d is the length of the coverage area of the camera; x is the downward inclination angle of the camera.
The following technical effects can be achieved in this embodiment:
according to the embodiment, the barrier transfer camera is used for mainly realizing the monitoring of the visual field blind area of the security check staff in the security check area, so that passengers are prevented from transferring bags which do not pass the security check into the security check area, and risk is avoided. Comprehensively considering the human body visual field range 8-10M and the visual field coverage of the station of the security inspector, and arranging barrier transfer cameras aiming at the barrier with the barrier distance of more than 10 meters in the security inspection area and the non-security inspection area.
Embodiment two:
in this embodiment, a method for arranging barrier delivery cameras includes the following steps:
step one: acquiring plane distribution information of security check areas of different types of station sites, and determining the position of a visual field blind area of a security inspector in the plane distribution information of the security check areas;
step two: according to the camera mounting information, calculating the declination angle of the camera by using a camera vertical view field angle calculation formula;
step three: establishing a simulation arrangement model according to plane distribution information of the security check area and position information of a visual field blind area of the security check person, introducing camera parameter information and the calculated declination angle of the camera into the simulation arrangement model for simulation imaging, and determining the installation position of the camera; and judging the simulated imaging effect according to a preset imaging standard, and fine-adjusting the installation position of the camera according to the judging result until the simulated imaging effect meets the preset imaging standard.
Specifically, the station site security check areas of different types in the first step comprise security check areas at the positions with the linear distance of 15-25 meters between the security check doors of the two security check points of the standard station, security check areas at the positions with the linear distance of 25-85 meters between the security check doors of the two security check points of the standard station, and security check areas from the security check doors of the L-shaped security check points to the positions of 10 meters of the gate rail.
Specifically, the camera mounting information in the second step includes a camera mounting height h1 and a furthest-end height h2 of the angle of view on the camera.
Specifically, the calculation formula of the vertical view field angle of the camera in the second step is as follows:
v is the vertical view field angle of the camera lens, and v is smaller than 90 degrees; h1 is the mounting height of the camera; h2 is the most far-end height of the angle of view on the camera; d is the length of the coverage area of the camera; x is the downward inclination angle of the camera.
The embodiment further includes calculation of the camera blind area L, and the calculation process is as follows:
wherein L is the length of a blind area of the camera; x is the declination angle of the camera; h1 is the mounting height of the camera.
The following technical effects can be achieved in this embodiment: according to the embodiment, on the basis of the first embodiment, the arrangement method is adjusted aiming at the blind area of the camera, and the security inspection points which do not accord with the deployment condition in the security inspection area can be monitored by calculating the blind area of the camera. The security inspection points which do not meet deployment conditions are mainly concentrated on sites where the security inspection points are close to the gate, wherein old lines, transfer stations, temporary security inspection points are most, and security inspection points of L-shaped security inspection point railings <10M in each line.
Embodiment III:
in this embodiment, a method for arranging barrier delivery cameras includes the following steps:
step one: acquiring plane distribution information of security check areas of different types of station sites, and determining the position of a visual field blind area of a security inspector in the plane distribution information of the security check areas;
step two: according to the camera mounting information, calculating the declination angle of the camera by using a camera vertical view field angle calculation formula;
step three: establishing a simulation arrangement model according to plane distribution information of the security check area and position information of a visual field blind area of the security check person, introducing camera parameter information and the calculated declination angle of the camera into the simulation arrangement model for simulation imaging, and determining the installation position of the camera; and judging the simulated imaging effect according to a preset imaging standard, and fine-adjusting the installation position of the camera according to the judging result until the simulated imaging effect meets the preset imaging standard.
Specifically, the station site security check areas of different types in the first step comprise security check areas at the positions with the linear distance of 15-25 meters between the security check doors of the two security check points of the standard station, security check areas at the positions with the linear distance of 25-85 meters between the security check doors of the two security check points of the standard station, and security check areas from the security check doors of the L-shaped security check points to the positions of 10 meters of the gate rail.
Specifically, the camera mounting information in the second step includes a camera mounting height h1 and a furthest-end height h2 of the angle of view on the camera.
Specifically, the calculation formula of the vertical view field angle of the camera in the second step is as follows:
v is the vertical view field angle of the camera lens, and v is smaller than 90 degrees; h1 is the mounting height of the camera; h2 is the most far-end height of the angle of view on the camera; d is the length of the coverage area of the camera; x is the downward inclination angle of the camera.
The embodiment further includes calculation of the camera blind area L, and the calculation process is as follows:
wherein L is the length of a blind area of the camera; x is the declination angle of the camera; h1 is the mounting height of the camera.
In this embodiment, the deployment situation of the camera arrangement method at three types of security inspection points is also provided. The three types of security inspection points are security inspection points with the straight line distance between two security inspection points of the standard station being 15-25 meters and 25-85 meters respectively, and the distance from the security inspection point of the L-shaped security inspection point to the gate rail being more than 10 meters, and according to the camera arrangement method provided by the first embodiment, the specific deployment scheme for arranging the cameras or the cameras in actual scenes is as follows:
1. standard station barrier delivery camera deployment scheme
According to the algorithm requirement: the camera is deployed right above the iron horse (+ -7.5 CM), and the human picture pixels require 100 x 100px.
1. The deployment focal length is 3.8mm, the coverage angle is wide, but the effective area is too short, and the standard station long-distance deployment is not satisfied. The intermediate focal length cannot be determined by debugging. In summary, a camera coverage deployment with a focal length of 16MM is selected, and the field angle is 14.4 degrees.
2. Deployment height determination: hall floor height: 2.8-3 m, and the tail height of the bracket is 20CM, which is 2.4m in consideration of actual deployment.
3. Deployment angle: the deployment declining angle is 8 degrees, the blind area is 8.83 meters, the effective coverage is 20 meters, and the most distant field coverage height is 2 meters. The height of the camera lens is 2.4 meters, the focal length is 16mm, the camera deployment declination angle is calculated to be 8 degrees by utilizing a camera vertical view field angle calculation formula and a blind area calculation formula, the blind area is 8.83 meters, the effective coverage is 20 meters, the farthest field coverage is 2 meters, and the camera deployment declination angle is used as a deployment scheme of a barrier delivery camera.
2. Site deployment criteria:
1. boom mounting position: the non-security inspection area and the railing of the security inspection area are right above each other, and the fluctuation range is within +/-7.5 CM of the railing. The lateral position is according to fig. 2 in particular. 2. Deployment declination angle: the angle is 6-8 degrees, and the optimal angle is 8 degrees; horizontal angle: parallel to the railing. 3. Deployment height: the lower edge of the lens is 2.4 meters away from the ground, and the joint of the suspender is 2.62 meters + -3 CM away from the ground. The special site is installed in a bracket mode. 4. Deployment focal length: the camera focal length is 16mm. The effective coverage distance is deployed to be 20 meters, the video analysis area is 20 meters, and the blind area is 9 meters. The coverage angle is shown in fig. 2.
3. Deployment scheme of 25-45 m standard station barrier delivery camera
According to the camera downward inclination angle and the blind area calculated by the method, in combination with the actual security inspection requirement, two cameras are selected in the scene in a correlation mode, the two cameras are deployed at the positions, which are 9 meters away from the center point, of the two security inspection points, which are close to the center point between the security inspection doors on the railing side, and the two cameras are deployed respectively, and the deployment effect is shown in figure 3 by referring to the deployment standard.
4. 45-65 m standard station barrier delivery camera deployment scheme
Three cameras are arranged between two security inspection points and the security inspection door close to the side of the railing and are divided into three equal parts. The distance between the two cameras is about 9 meters away from the 1/3 section point, the two cameras adopt a correlation scheme, and an adjacent camera is arranged in the opposite direction at the position of the camera 9 meters left in the 2/3 section point to carry out blind area coverage and imaging effect enhancement; the rest parameters are deployed by referring to the site deployment standard, and the deployment effect is shown in fig. 4.
5. Deployment scheme of 65-85 m standard station barrier delivery camera
Four cameras are arranged between two security inspection points and the security inspection door close to the side of the railing and are divided into four equal parts. The distance between the two points is about 9 meters from the 1/4 section point to the 3/4 section point, and the two points are respectively deployed by adopting a correlation scheme of two cameras; the rest parameters are deployed by referring to the site deployment standard, and the final deployment effect is shown in fig. 5.
6. L-shaped security inspection area deployment scheme
The scheme mainly deploys the area outside the visual field range of the security inspector, and the visual field range of the human body: 8M-10M, combining each security inspector station of the website, disposing the L-shaped security inspection point barrier transfer camera at the security inspection point which is more than 10 meters away from the security inspector position, and guaranteeing to cover the visual field blind area of the security inspector, wherein relevant parameters are disposed according to the website disposition standard.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The arrangement method of the barrier delivery cameras is characterized by comprising the following steps of:
step one: acquiring plane distribution information of security check areas of different types of station sites, and determining the position of a visual field blind area of a security inspector in the plane distribution information of the security check areas;
step two: according to the camera installation information, calculating the declination angle of the camera by using a camera vertical view field angle calculation formula, wherein the camera vertical view field angle calculation formula is as follows:
v is the vertical view field angle of the camera lens, and v is smaller than 90 degrees; h1 is the mounting height of the camera; h2 is the most far-end height of the angle of view on the camera; d is the length of the coverage area of the camera; x is the declination angle of the camera;
step three: establishing a simulation arrangement model according to plane distribution information of the security check area and position information of a visual field blind area of the security check person, introducing camera parameter information and the calculated declination angle of the camera into the simulation arrangement model for simulation imaging, and determining the installation position of the camera; and judging the simulated imaging effect according to a preset imaging standard, and fine-adjusting the installation position of the camera according to the judging result until the simulated imaging effect meets the preset imaging standard.
2. The method for arranging barrier delivery cameras according to claim 1, wherein the security check areas of different types of stations in the first step comprise a security check area at a position with a linear distance of 15-25 meters between two security check points of a standard station security check gate, a security check area at a position with a linear distance of 25-85 meters between two security check points of a standard station security check gate, and a security check area from an L-shaped security check point security check gate to a gate rail of 10 meters.
3. The method for arranging barrier delivery cameras according to claim 1, wherein the camera mounting information in the second step includes a camera mounting height h1 and a camera upper view angle most distal height h2.
4. The method for arranging barrier delivery cameras according to claim 1, wherein the second step further comprises calculating the length L of the blind area of the camera, and the calculation process is as follows:
wherein L is the length of a blind area of the camera; x is the declination angle of the camera; h1 is the mounting height of the camera.
5. The arrangement method of barrier delivery cameras as claimed in claim 1, wherein the cameras are ocean-vision DS-2CD702XYZUV-ABCDEF gun cameras, the lenses are HV3816D-8MPIR lenses, and DS-1341HZ indoor protection is adopted for installation and fixation.
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