CN204904585U - High definition video all -in -one, traffic signal system and because traffic signals control system of vision sensing - Google Patents
High definition video all -in -one, traffic signal system and because traffic signals control system of vision sensing Download PDFInfo
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Abstract
The utility model discloses a high definition video all -in -one, traffic signal system and because traffic signals control system of vision sensing, wherein, the high definition video all -in -one includes: the information acquisition unit for acquire the video image in current each lane of road in real time, the vehicle test unit is used for the basis the video image who acquires detects the vehicle of current road, the parameter acquisition unit is used for the basis the vehicle of the current road that detects acquires the traffic signals parameter, the traffic signals parameter includes: the vehicle flowrate in each lane, vehicle line up length, the average speed of a motor vehicle, the average latency that lines up, the message routing unit, be used for with traffic signals send parameters is to traffic signals machine and back -end server, so that traffic signal system and back -end server control are adjusted traffic signal lamp. Adopt the utility model discloses not only improve each lane of current road vehicle state statistical accuracy, still improved traffic signal lamp's control accuracy.
Description
Technical field
The utility model relates to technical field of intelligent traffic, particularly the traffic signal control system of a kind of HD video all-in-one, traffic signaling equipment and view-based access control model sensing.
Background technology
Along with Chinese Urbanization's paces are constantly accelerated, urban transportation total size is also thereupon increasing, and the development of urban highway traffic facility is more outstanding with the contradiction of the urban automobile quantity day by day expanded.The urban traffic environment how effective alleviation is blocked up day by day and the social concern caused therefrom, become the thing that current city traffic administration is urgently to be resolved hurrily.
At present, the control mode of city traffic signal lamp comprises: fixing timing, based on ground induction coil vehicle detection mode, based on earth induction mode and forward wide beam microwave sounding mode etc.Such as: based on ground induction coil vehicle detection mode in order to effectively regulate traffic congestion situation in real time, normally let pass at the orientation preferentially that vehicle queue length is longer, or the green light extending this direction is let pass the time.In order to effectively improve the adjustment accuracy of estimation of traffic lights in real time, the control mode of existing control traffic lights is, multiple ground induction coil is buried underground by the different distance in every track in each direction around traffic lights, the vehicle flowrate of current lane is detected in real time by this ground induction coil, the vehicle running state of the current lane such as the speed of a motor vehicle, and described vehicle running state is sent it back traffic lights processor in real time, by the vehicle running state of described traffic lights according to described corresponding track, regulable control traffic lights.
Therefore, design in the control procedure of traffic lights inventor, find that in prior art, at least there are the following problems:
The control mode of existing traffic lights, in the process of carrying out Traffic signal control, is that bicycle road detects vehicle running state due to what all adopt, makes vehicle running state statistical precision not high, thus cause the control accuracy of traffic lights low.
Utility model content
In view of the above problems, propose the utility model to overcome the problems referred to above or to solve the problem at least in part, the technical solution of the utility model is achieved in that
On the one hand, the utility model provides a kind of HD video all-in-one, comprising:
Information acquisition unit, for the video image in each track of Real-time Obtaining present road;
Vehicle detection unit, for the video image according to described acquisition, detects the vehicle of described present road;
Parameter acquiring unit, for the vehicle of present road detected described in basis, obtains traffic signals parameter; Described traffic signals parameter comprises: the vehicle flowrate in each track described, vehicle queue length, average speed, average queuing latency;
Information transmitting unit, for described traffic signals parameter is sent to traffic signaling equipment and back-end server, so that traffic lights described in described traffic signaling equipment and back-end server regulating and controlling.
On the other hand, the utility model provides a kind of traffic signaling equipment, comprising:
Information receiving unit, for receiving traffic signals parameter and the vehicle status information by corresponding video magnetic test coil;
Information determination unit, for according to described traffic signals parameter and described vehicle by the status information of corresponding video magnetic test coil, determine that the traffic lights of present road pass through the time;
Information transmitting unit, describedly determines the traffic lights of present road by the time to traffic lights, to control traffic lights for sending.
Again on the one hand, the utility model additionally provides a kind of traffic signal control system of view-based access control model sensing, comprising: as above HD video all-in-one described in any one, as above traffic signaling equipment described in any one, background server and traffic lights;
Described HD video all-in-one, for the video image in each track of Real-time Obtaining present road; According to the video image of described acquisition, detect the vehicle of described present road; According to the vehicle of the described present road detected, obtain traffic signals parameter; Described traffic signals parameter comprises: the vehicle flowrate in each track described, vehicle queue length, average speed, average queuing latency; Described traffic signals parameter is sent to traffic signaling equipment and back-end server, so that traffic lights described in described traffic signaling equipment and back-end server regulating and controlling;
Described traffic signaling equipment, for receiving traffic signals parameter and the vehicle status information by corresponding video magnetic test coil; According to described traffic signals parameter and described vehicle by the status information of corresponding video magnetic test coil, determine that the traffic lights of present road pass through the time; Send and describedly determine the traffic lights of present road by the time to traffic lights, to control traffic lights;
Described background server, for sending Traffic signal control indicator signal to described traffic signaling equipment;
Described traffic lights, for the traffic lights of determination present road that send according to described traffic signaling equipment by the time, what control traffic lights passes through the time.
The technical solution of the utility model is by HD video all-in-one, the vehicle of present road detects in real time, and obtain traffic signals parameter and the vehicle status information by corresponding video magnetic test coil, and send to Traffic signal control to carry out Dynamic controlling traffic signals by the status information of corresponding video magnetic test coil on described traffic signals parameter and vehicle pass through the time, and can also by described traffic signals parameter is sent to background server, thus the single-point realizing traffic lights intelligence controls, major trunk roads control and Region control.Can be detected in real time the vehicle in each track of present road by HD video all-in-one by technical solutions of the utility model simultaneously, and by sending to traffic signaling equipment and background server in real time, that carries out real-time traffic signal lamp passes through time controling, thus improve the vehicle running state statistical precision in each track of present road, also improve the control accuracy of traffic lights further.Arranged based on ground induction coil vehicle detection mode with compared with earth induction mode by ground construction with prior art, technical solutions of the utility model embodiment not only reduces construction cost, but also reduces later maintenance cost.
Accompanying drawing explanation
A kind of HD video all-in-one machine structure schematic diagram that Fig. 1 provides for the utility model embodiment;
A kind of traffic signaling equipment structural representation that Fig. 2 provides for the utility model embodiment;
The traffic signal control system structural representation of a kind of view-based access control model sensing that Fig. 3 provides for the utility model embodiment;
A kind of HD video all-in-one video sensing range schematic diagram that Fig. 4 provides for the utility model embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model embodiment is described in further detail.
As a kind of HD video all-in-one machine structure schematic diagram that Fig. 1 provides for the utility model embodiment; This HD video all-in-one comprises:
Information acquisition unit 201, for the video image in each track of Real-time Obtaining present road;
Vehicle detection unit 202, for the video image according to described acquisition, detects the vehicle of described present road;
Parameter acquiring unit 203, for the vehicle of present road detected described in basis, obtains traffic signals parameter; Described traffic signals parameter comprises: the vehicle flowrate in each track described, vehicle queue length, average speed, average queuing latency;
Information transmitting unit 204, for described traffic signals parameter is sent to traffic signaling equipment and back-end server, so that traffic lights described in described traffic signaling equipment and back-end server regulating and controlling.
It should be noted that, described parameter acquiring unit specifically comprises:
Characteristic information obtains subelement, for according to described video image, obtains vehicle characteristic information, determines currently to pass through vehicle;
Locating and tracking subelement, for by Multi-target position and tracking vehicle technology, determines the current by vehicle location of described each track of present road, line trace process of going forward side by side;
Parameter acquiring subelement, for according to the positional information of each vehicle described and tracking mode information, obtains the traffic signals parameter of corresponding vehicle place road.
Also it should be noted that, described parameter acquiring unit also comprises:
Preset subelement, for presetting at least one video magnetic test coil;
Whether judgment sub-unit, for the vehicle of present road that detects described in judging by described video magnetic test coil;
Described parameter acquiring subelement, if also pass through described video magnetic test coil for described vehicle, then obtains the status information of described vehicle by corresponding video magnetic test coil.
Also it should be noted that, described information transmitting unit, for sending the status information of described vehicle by corresponding video magnetic test coil to described traffic signaling equipment, so that described traffic signaling equipment adjustment present road traffic lights.
As shown in Figure 2, be a kind of traffic signaling equipment structural representation that the utility model embodiment provides; This traffic signaling equipment comprises:
Information receiving unit 401, for receiving traffic signals parameter and the vehicle status information by corresponding video magnetic test coil;
Information determination unit 402, for according to described traffic signals parameter and described vehicle by the status information of corresponding video magnetic test coil, determine that the traffic lights of present road pass through the time;
Information transmitting unit 403, describedly determines the traffic lights of present road by the time to traffic lights, to control traffic lights for sending.
It should be noted that, described traffic signaling equipment also comprises:
Preset unit, for default traffic lights the longest by the time and the shortlyest pass through the time;
Described information determination unit is not specifically for ought receiving the status information of described vehicle by corresponding video magnetic test coil, and/or, the Traffic signal control indicator signal that described back-end server sends, then determine that the traffic lights of present road pass through the time by the time for the shortest; When receiving the status information of described vehicle by corresponding video magnetic test coil, the traffic lights of the present road determined according to preset rules exceed the longest by the time by the time, then determine that the traffic lights of present road pass through the time by the time for the longest.
Also it should be noted that, described traffic signaling equipment also comprises:
Described information receiving unit, also for receiving the Traffic signal control indicator signal that back-end server sends;
Described information determination unit, also for according to described Traffic signal control indicator signal, determines that the traffic lights of present road pass through the time.
As shown in Figure 3, the traffic signal control system structural representation of a kind of view-based access control model sensing provided for the utility model embodiment; This system comprises: HD video all-in-one 501, traffic signaling equipment 502, background server 503 and traffic lights 504;
Described HD video all-in-one, for the video image in each track of Real-time Obtaining present road; According to the video image of described acquisition, detect the vehicle of described present road; According to the vehicle of the described present road detected, obtain traffic signals parameter; Described traffic signals parameter comprises: the vehicle flowrate in each track described, vehicle queue length, average speed, average queuing latency; Described traffic signals parameter is sent to traffic signaling equipment and back-end server, so that traffic lights described in described traffic signaling equipment and back-end server regulating and controlling;
Described traffic signaling equipment, for receiving traffic signals parameter and the vehicle status information by corresponding video magnetic test coil; According to described traffic signals parameter and described vehicle by the status information of corresponding video magnetic test coil, determine that the traffic lights of present road pass through the time; Send and describedly determine the traffic lights of present road by the time to traffic lights, to control traffic lights;
Described background server, for sending Traffic signal control indicator signal to described traffic signaling equipment;
Described traffic lights, for the traffic lights of determination present road that send according to described traffic signaling equipment by the time, what control traffic lights passes through the time.
Based on above embodiment, utility model works principle is described in detail;
First, the concrete principle of described HD video all-in-one acquisition traffic signals parameter is described in detail; Be specially: described traffic signals parameter comprises: the vehicle flowrate in each track described, vehicle queue length, average speed, average queuing latency;
Wherein, the concrete acquisition process of the vehicle flowrate in each track described is:
The vehicle flowrate in each track of described present road is by Multi-target position and follow the tracks of vehicle technology, by the number of vehicles in corresponding track in the statistical unit time, statistical study can be carried out to this crossing traffick, carry out the data statistics of different cycles according to demand and gather, and Parameter statistical analysis form can be generated.The design parameter content of the vehicle flowrate in each track can comprise: vehicle flowrate, average velocity, occupation rate, vehicle, lane number, travel direction, the number-plate number, body color etc.
The concrete acquisition process of described vehicle queue length is:
By Multi-target position and tracking vehicle technology, determine the current by vehicle location of described each track of present road, line trace process of going forward side by side, by vehicle detection and tracking, obtain the vehicle queue length in each track of present road.The like, the all directions of traffic lights, acquisition of information and analysis can be carried out by the HD video all-in-one in respective direction, and described traffic signals parameter is sent to traffic signaling equipment and back-end server, so that traffic lights described in described traffic signaling equipment and back-end server regulating and controlling.
The acquisition process of described average speed is as follows:
Described HD video all-in-one, by demarcating the video image obtained, obtains the average velocity of vehicle in a period of time inside lane.Specifically can be calculated by the following means speed that is averaged: two two field pictures that described HD video all-in-one continuous acquisition in vehicle monitoring video-standard signal arrives, extrapolated the speed of a motor vehicle of this vehicle by the displacement size of the corresponding point in two two field pictures, corresponding line and corresponding blocks and the frame per second of corresponding camera, thus calculate the average speed in each track further.
The acquisition process of described average queuing latency is as follows:
1) described HD video all-in-one detects each vehicle average velocity in its video sensing range;
2) zone length of the video sensing range of described HD video all-in-one is divided by described vehicle average velocity, draws the time of each vehicle by the zone length of described video sensing range;
3) in predetermined period, all vehicles, by the time sum of the zone length of described video sensing range, are averaged, and obtain the average queue time of vehicle in described predetermined period.
It should be noted that, the above traffic signals parameter may be used for the control algolithm that traffic signaling equipment is used for adjusting traffic lights, such as: the Signalized control parameter such as red light cycle, split, phase place that can utilize described traffic signals parameter adjustment traffic lights.
Described traffic signaling equipment and HD video all-in-one on-line working, reduce in prior art the construction and maintenance cost that adopt the buried magnetic of subsurface and ground induction coil, described HD video all-in-one supports that video magnetic test coil detects, and at least one group of video magnetic test coil is supported in equidirectional same track, within described video magnetic test coil position is preset in described HD video all-in-one video sensing range, such as: described HD video all-in-one video sensing range be 15-100 rice as shown in Figure 4, then described video magnetic test coil position can according to concrete road conditions need be located at any position within described 15-100 rice, such as: as long as detected in video image that vehicle passes through, if this vehicle is by described video magnetic test coil, described HD video all-in-one obtains the status information of described vehicle by corresponding video magnetic test coil, and by described vehicle by the status information of corresponding video magnetic test coil directly by being sent to traffic signaling equipment, and back-end server, namely the vehicle detected is by being preset in the video magnetic test coil at 60m place, then described HD video all-in-one can by this vehicle-related information (such as: the speed of this vehicle, vehicle, license board information, the information such as car body color) and the setting position information (such as: the current distance of this video check coil and described HD video all-in-one) of video magnetic test coil send to traffic signaling equipment (described traffic signaling equipment according to described in the positional information of the vehicle-related information that receives and video magnetic test coil), and back-end server.The overlayable distance in described video magnetic test coil position decides according to the sensing range of described HD video all-in-one.
It should be noted that, described one group of video magnetic test coil refers to the video magnetic test coil that each track of present road is arranged; The i.e. road of three lanes, one group of video magnetic test coil just has three video magnetic test coils; These three coils can be arranged in described HD video all-in-one sensing range according to actual conditions; Such as: these three video magnetic test coils together can be arranged at the position apart from described HD video all-in-one 45m, also can a position being arranged at described HD video all-in-one 45m, another is arranged at the position of described HD video all-in-one 60m, the 3rd position being arranged at described HD video all-in-one 90m.
Also it should be noted that, the above traffic signals parameter both can send to traffic signaling equipment, namely the traffic signals on single-point are controlled by traffic signaling equipment, also can send to back-end server, what to be urban road network traffic inducible system be overall road conditions dredge automatically and control provides input data simultaneously.Meanwhile, technical solutions of the utility model can also carry out quantitative or qualitative warning to queue length in various degree, warning message network are uploaded to rear end management host simultaneously.Thus realize the multiple important application function such as intelligentized control method, road emergency condition real-time early warning, urban traffic guidance of traffic lights.
The technical solution of the utility model is by HD video all-in-one, the vehicle of present road detects in real time, and obtain traffic signals parameter and the vehicle status information by corresponding video magnetic test coil, and send to Traffic signal control to carry out Dynamic controlling traffic signals by the status information of corresponding video magnetic test coil on described traffic signals parameter and vehicle pass through the time, and can also by described traffic signals parameter is sent to background server, thus the single-point realizing traffic lights intelligence controls, major trunk roads control and Region control.Can be detected in real time the vehicle in each track of present road by HD video all-in-one by technical solutions of the utility model simultaneously, and by sending to traffic signaling equipment and background server in real time, that carries out real-time traffic signal lamp passes through time controling, thus improve the vehicle running state statistical precision in each track of present road, also improve the control accuracy of traffic lights further.Arranged based on ground induction coil vehicle detection mode with compared with earth induction mode by ground construction with prior art, technical solutions of the utility model embodiment not only reduces construction cost, but also reduces later maintenance cost.
The foregoing is only preferred embodiment of the present utility model, be not intended to limit protection domain of the present utility model.All do within spirit of the present utility model and principle any amendment, equivalent replacement, improvement etc., be all included in protection domain of the present utility model.
Claims (8)
1. a HD video all-in-one, is characterized in that, comprising:
Information acquisition unit, for the video image in each track of Real-time Obtaining present road;
Vehicle detection unit, for the video image according to described acquisition, detects the vehicle of described present road;
Parameter acquiring unit, for the vehicle of present road detected described in basis, obtains traffic signals parameter; Described traffic signals parameter comprises: the vehicle flowrate in each track described, vehicle queue length, average speed, average queuing latency;
Information transmitting unit, for described traffic signals parameter is sent to traffic signaling equipment and back-end server, so that traffic lights described in described traffic signaling equipment and back-end server regulating and controlling.
2. HD video all-in-one according to claim 1, is characterized in that, described parameter acquiring unit specifically comprises:
Characteristic information obtains subelement, for according to described video image, obtains vehicle characteristic information, determines currently to pass through vehicle;
Locating and tracking subelement, for by Multi-target position and tracking vehicle technology, determines the current by vehicle location of described each track of present road, line trace process of going forward side by side;
Parameter acquiring subelement, for according to the positional information of each vehicle described and tracking mode information, obtains the traffic signals parameter of corresponding vehicle place road.
3. HD video all-in-one according to claim 2, is characterized in that, described parameter acquiring unit also comprises:
Preset subelement, for presetting at least one video magnetic test coil;
Whether judgment sub-unit, for the vehicle of present road that detects described in judging by described video magnetic test coil;
Described parameter acquiring subelement, if also pass through described video magnetic test coil for described vehicle, then obtains the status information of described vehicle by corresponding video magnetic test coil.
4. HD video all-in-one according to claim 3, it is characterized in that, described information transmitting unit, for sending the status information of described vehicle by corresponding video magnetic test coil to described traffic signaling equipment, so that described traffic signaling equipment adjustment present road traffic lights.
5. a traffic signaling equipment, is characterized in that, comprising:
Information receiving unit, for receiving traffic signals parameter and the vehicle status information by corresponding video magnetic test coil;
Information determination unit, for according to described traffic signals parameter and described vehicle by the status information of corresponding video magnetic test coil, determine that the traffic lights of present road pass through the time;
Information transmitting unit, describedly determines the traffic lights of present road by the time to traffic lights, to control traffic lights for sending.
6. traffic signaling equipment according to claim 5, is characterized in that, described traffic signaling equipment also comprises:
Preset unit, for default traffic lights the longest by the time and the shortlyest pass through the time;
Described information determination unit is not specifically for ought receiving the status information of described vehicle by corresponding video magnetic test coil, and/or, the Traffic signal control indicator signal that back-end server sends, then determine that the traffic lights of present road pass through the time by the time for the shortest; When receiving the status information of described vehicle by corresponding video magnetic test coil, the traffic lights of the present road determined according to preset rules exceed the longest by the time by the time, then determine that the traffic lights of present road pass through the time by the time for the longest.
7. the traffic signaling equipment according to claim 5 or 6, is characterized in that, described traffic signaling equipment also comprises:
Described information receiving unit, also for receiving the Traffic signal control indicator signal that back-end server sends;
Described information determination unit, also for according to described Traffic signal control indicator signal, determines that the traffic lights of present road pass through the time.
8. the traffic signal control system of a view-based access control model sensing, it is characterized in that, comprise: as HD video all-in-one as described in any one in Claims 1-4, as traffic signaling equipment as described in any one in claim 5 to 7, background server and traffic lights;
Described HD video all-in-one, for the video image in each track of Real-time Obtaining present road; According to the video image of described acquisition, detect the vehicle of described present road; According to the vehicle of the described present road detected, obtain traffic signals parameter; Described traffic signals parameter comprises: the vehicle flowrate in each track described, vehicle queue length, average speed, average queuing latency; Described traffic signals parameter is sent to traffic signaling equipment and back-end server, so that traffic lights described in described traffic signaling equipment and back-end server regulating and controlling;
Described traffic signaling equipment, for receiving traffic signals parameter and the vehicle status information by corresponding video magnetic test coil; According to described traffic signals parameter and described vehicle by the status information of corresponding video magnetic test coil, determine that the traffic lights of present road pass through the time; Send and describedly determine the traffic lights of present road by the time to traffic lights, to control traffic lights;
Described background server, for sending Traffic signal control indicator signal to described traffic signaling equipment;
Described traffic lights, for the traffic lights of determination present road that send according to described traffic signaling equipment by the time, what control traffic lights passes through the time.
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| CN105702055A (en) * | 2016-03-17 | 2016-06-22 | 深圳市哈工大交通电子技术有限公司 | Signal lamp integrating detection, control, communication and release and control method thereof |
| CN106384517A (en) * | 2015-08-03 | 2017-02-08 | 兰州市公安局交通警察支队交通科研所 | Traffic signal control method based on visual sensing, apparatus and system thereof |
| CN106530701A (en) * | 2016-11-23 | 2017-03-22 | 北海高创电子信息孵化器有限公司 | System for real-time monitoring and improvement of urban traffic condition |
| CN106530760A (en) * | 2016-11-25 | 2017-03-22 | 天津易赢尔节能技术有限公司 | Energy-saving and efficient electric signal lamp intelligence system based on user interaction |
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| CN106384517A (en) * | 2015-08-03 | 2017-02-08 | 兰州市公安局交通警察支队交通科研所 | Traffic signal control method based on visual sensing, apparatus and system thereof |
| CN105702055A (en) * | 2016-03-17 | 2016-06-22 | 深圳市哈工大交通电子技术有限公司 | Signal lamp integrating detection, control, communication and release and control method thereof |
| CN106530701A (en) * | 2016-11-23 | 2017-03-22 | 北海高创电子信息孵化器有限公司 | System for real-time monitoring and improvement of urban traffic condition |
| CN106530760A (en) * | 2016-11-25 | 2017-03-22 | 天津易赢尔节能技术有限公司 | Energy-saving and efficient electric signal lamp intelligence system based on user interaction |
| CN107134156A (en) * | 2017-06-16 | 2017-09-05 | 上海集成电路研发中心有限公司 | A kind of method of intelligent traffic light system and its control traffic lights based on deep learning |
| CN110874938A (en) * | 2018-08-31 | 2020-03-10 | 百度在线网络技术（北京）有限公司 | Traffic light control system and traffic light control method |
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| CN109712413A (en) * | 2019-01-29 | 2019-05-03 | 蚌埠学院 | The cross control of traffic and road control method and system for having automatic regulation function |
| CN110599781A (en) * | 2019-09-23 | 2019-12-20 | 潍坊畅讯交通设施工程有限公司 | Traffic flow statistics and recognition system for intelligent city |
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| CGPU | Change to patent or to utility model | ||
| CU01 | Correction of utility model patent |
Correction item: Address of the patentee Correct: No. 739 Binhe East Road, Chengguan District, Gansu, Lanzhou False: 739, Binhe East Road, Chengguan District, Lanzhou, Beijing, Haidian District Number: 51 Page: The title page Volume: 31 |
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| CU03 | Correction of utility model patent gazette |
Correction item: Address of the patentee Correct: No. 739 Binhe East Road, Chengguan District, Gansu, Lanzhou False: 739, Binhe East Road, Chengguan District, Lanzhou, Beijing, Haidian District Number: 51 Volume: 31 |
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| ERR | Gazette correction | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 730100, No. 739 Binhe East Road, Chengguan District, Gansu, Lanzhou Patentee after: TRANSPORTATION RESEARCH INSTITUTE OF TRAFFIC POLICE DIVISION, LANZHOU MUNICIPAL PUBLIC SECURITY BUREAU Patentee after: Wen'an Beijing intelligent technology Limited by Share Ltd Address before: 730100, No. 739 Binhe East Road, Chengguan District, Gansu, Lanzhou Patentee before: TRANSPORTATION RESEARCH INSTITUTE OF TRAFFIC POLICE DIVISION, LANZHOU MUNICIPAL PUBLIC SECURITY BUREAU Patentee before: Beijing Wenan Technology Development Co., Ltd. |