CN105261258B

CN105261258B - A kind of Camera Tracking System and method based on on-off model

Info

Publication number: CN105261258B
Application number: CN201510814395.3A
Authority: CN
Inventors: 郭景; 时珍全
Original assignee: Tianjin Polytechnic University
Current assignee: Tianjin Polytechnic University
Priority date: 2015-11-18
Filing date: 2015-11-18
Publication date: 2018-05-08
Anticipated expiration: 2035-11-18
Also published as: CN105261258A

Abstract

The present invention provides a kind of Camera Tracking System and method based on on-off model, belong to field of traffic control.The Camera Tracking System based on on-off model includes the sensor being arranged in test site and place signal switch board, is arranged on the onboard system taken an examination on car, the database server, apps server and the video monitoring server that are arranged on control centre, and the camera pan-tilt being arranged in test site；The sensor is arranged on the starting point of test subject；The on-off model that the place signal switch board collection sensor produces；Control centre obtains on-off model by network connection or RS232 connections from place signal switch board, state change from 0 to 1 occurs to the initial signal that control centre transmits if initial signal voltage changes, represent that vehicle comes into, control centre directly retrieves preset point period according to the contact of the data of subject, vehicle, tester.

Description

A kind of Camera Tracking System and method based on on-off model

Technical field

The invention belongs to field of traffic control, and in particular to a kind of Camera Tracking System and side based on on-off model Method.

Background technology

The examination of vehicle driver subject two is commonly called as place driving path, and driver need to complete the Ministry of Public Security in test site 《123》Some subject sides of command requirement are to pass the examination.The vehicle driver standard claimed according to driver drives rank difference, The subject of completion is also different, and it is C1 to drive rank such as standard, then needs the completion " reversing storage " in test site, " positioning of slope road stops Car and starting ", " lateral parking ", " right-angled bend " four subjects.With the continuous improvement of people's living standards, carry out motor-driven The student of car driver examination also increases year by year, and the difficulty of examination supervision is also constantly increasing.It is to prevent student from replacing in examination hall Examine, the behaviors such as normal place malpractices are set, such as fingerprint individual verification, examination process pan-shot have been continually introduced in examination hall Means.But these means still have some shortcomings, the student much to leave things to chance still finds the loophole of some test sites, is examined for it Practice fraud during examination and facility is provided.

Realize that examination system used in the area of place driving path electronization examination requires in-car in present China Vehicle-mounted computer configuration video monitoring and video file upload function.At the same time panoramic shooting is set in test site The testing situations of all vehicles in machine, shooting and record test site, and it is uploaded to the function of supervision center.These means are very Solve the problems, such as that examination is in-car in big degree and car outside take an examination monitoring, but examining for a certain examination student or a certain vehicle Examination all-the-way tracking still suffers from some shortcomings.Driver's face and identity are only monitored as in-car video monitoring image, it is outdoor Panoramic camera observation is all vehicles and all subjects, its level of detail still suffers from very big deficiency, even if there is holder can be into Row remote control, but focal position and place dead angle can still result in the unintelligible or leaky of video capture.

Other one layer of meaning of examination video monitoring is to supervise by video, and the False Rate in examination hall is reduced. The test site that so-called erroneous judgement refers to since place signal is disturbed, cause not possess under the conditions of taking an examination exists to vehicle driver Generated in examination process mistake judgement so that cause its mistake by deduction fraction or should deduct fraction situation but Not by deduction corresponding scores.This is likely to occur in any type electronization examination process, believes for example with switching value Number it is the test site of judgment basis, the reason for it is judged by accident appears in the sensors such as photoelectricity, Hall of setting more in the place in and is subject to The influence of weather or human factor, as the interference of snowflake, fallen leaves, motor-vehicle tail-gas to photosignal for another example strong wind to hall sensing Device Deccan is disturbed.A new generation electronic test site use differential GPS as signal judging basis, but can also be subject to cloud layer, The influence of the factors such as GPS drifts.There occurs erroneous judgement will produce dispute, then can be to by mistake by video monitoring and human intervention Sentence and take measures to be corrected, while be also the information source that error correction and adjustment are carried out to examination equipment.And the monitoring of this respect It is difficult to meet to be used as judgment basis that either the in-car shooting of the panoramic shooting of test site or examination, which is all,.

The content of the invention

It is an object of the invention to solve above-mentioned problem existing in the prior art, there is provided a kind of based on on-off model Camera Tracking System and method.

The present invention is achieved by the following technical solutions：

A kind of Camera Tracking System based on on-off model, including the sensor being arranged in test site and place letter Number switch board, the onboard system being arranged on examination car, the database server for being arranged on control centre, apps server And video monitoring server, and the camera pan-tilt being arranged in test site；

The sensor is arranged on the starting point of test subject；

The on-off model that the place signal switch board collection sensor produces；

Control centre obtains on-off model by network connection or RS232 connections from place signal switch board, if Initial signal voltage changes then occurs state change from 0 to 1 to the initial signal that control centre transmits, and has represented vehicle Through entering, control centre directly retrieves preset point period according to the contact of the data of subject, vehicle, tester.

The sensor uses photoelectric sensor, Hall sensor or pressure sensitivity cable sensor.

The latitude and longitude information of the satellite positioning for car traveling of taking an examination is sent back control centre by the onboard system, by control The database server of the heart retrieves preset point period in tables of data, sends this data to video monitoring server, by regarding The instruction for calling control point is sent to preset camera pan-tilt by frequency monitoring server, controls the shooting on the camera pan-tilt Machine is into line trace.

The tables of data includes following information：Take an examination information of trainee, examination car information, test subject place information, pre- Put dot position information, satellite positioning range information, tester, car, subject, preset point, satellite positioning scope contacts list.

It is attached, is used using 485 buses between the camera pan-tilt and the video monitoring server of control centre Serial ports of computers is exported, and passive RS 232-485 interface equipment is used if command range is in 200 meters of distance ranges, Active RS232-485 interface equipments are used if distance is more than 200 meters；Output data form is 1 start bit, 8 digits According to position, no parity check position, baud rate 2400B/S.

The camera pan-tilt use can support the platform of PELCO-P agreements.

The camera tracking method realized using the Camera Tracking System based on RFID signal is as follows：

S1, determines test subject initial position trigger signal；

S2, determines that video camera shoots the optimal camera position of each test subject, angle is pre- as holder using these information A storage is put, is waited to be called；

The place of S3, the examination car that examinee is selected, test subject and selection forms exam information base table, waits and pre- Put an information association；

S4, the test subject selected according to examination hall and place, establish examinee, examine car, selection subject and place, preset point connection Close information；

S5, when receiving on-off model, calls preset point, forms image taking；

S6, judges whether preset point in subject, if it is, S7 is transferred to, if it is not, then being transferred to S8；

S7, is triggered according to signal in subject, calls preset point；

S8, Course Examination terminate, and wait and enter next subject；

S9, judges whether all subjects have all taken an examination, if it is, S10 is transferred to, if it is not, then returning to S5：

S10, calls a preset point of dispatching a car, and video camera steering examines test ground and drives position of dispatching a car.

Compared with prior art, the beneficial effects of the invention are as follows：The examination section that the present invention is travelled according to vehicle driver Mesh, with reference to examination Design of Signal in place and realizes a kind of outdoor seizure and image trace device with monopod video camera, Effectively the car body action of a certain vehicle or a certain student in examination process can be shot.It is advantageous that it can be directed to The examination overall process of a certain examination car or driver are shot, and examination process can be linked up with and return with the exam information of student Shelves.

Brief description of the drawings

The step block diagram of Fig. 1 the method for the present invention

The database information structure chart of Fig. 2 present systems

The control structure figure of Fig. 3 present systems.

Embodiment

The present invention is described in further detail below in conjunction with the accompanying drawings：

The solution of the present invention is specific as follows：

Firstth, the positioning of scene is imaged

The test site of place driving path is made of some test subjects, these test subjects are according to certain route quilt Organize together, there is road in examination hall to be attached between two different subjects, ultimately form a loop.That is examinee is from going out Hair point sets out to start to take an examination is returning to starting point by all subject rear vehicles.Vehicle is when each test subject is entered Section's purpose initial signal will be triggered.The form of initial signal has much at present, is roughly divided into three classes.The first kind is believed for RFID Number：Vehicle is read the RFID being arranged in test subject by the RFID card reader being arranged on examination car when entering subject and is penetrated Frequency card signal, starts so as to identify the test subject.Second class is on-off model, by being arranged on the light before test subject The triggering of the on-off models such as electricity, Hall, Magnetic Sensor, pressure sensitivity cable starts to identify section's purpose.Three classes are satellite Positioning signal, including GPS, the Big Dipper, Ge Luonasi etc., this kind of differential GPS signal being installed on examination car drives to be set in advance Then represent that the test subject starts in the range of fixed test subject.No matter the beginning mode in which kind of test subject, its purpose is all It is to have demarcated a commencing signal, so that the signal acquisition being also mounted on the car body dress no matter being provided on place Put the processing judged.From the angle of supervision, test start signal designates the position where examination car, this position Put front and rear error normal conditions and be no more than 20CM, the use of the subject initial signal error of on-off model is almost 0, uses RFID Error as initial signal is less than 20CM, and 5CM is usually no more than using the error of differential satellite positioning signal.So also giving needs The video camera to be tracked provides a degree of positional information., can be with when a certain vehicle triggers test subject commencing signal Camera lens are accurately positioned to the test subject region.

Secondth, associated with examinee and examination car information

In order to realize shooting tracking of the camera for certain examination vehicle and certain examination student, it is necessary to obtain certain student first The subject and place information of examination.In a comprehensive place driving path examination hall, often there are multiple identical subjects, with The examination car reequiped in advance matches.For example " side parking " subject is test time longest subject, then accordingly at one Multiple side parking stalls are set in examination hall, and right-angled bend is examination used time shortest subject, then the place of the test subject is with regard to phase To less.If examination vehicle is relatively more, considers the number in appropriate certain subject examination hall of increase, can so ensure examination Smoothness, prevents most student's parkings from examination road, waiting the situation of test subject.

Control centre can be according to the test subject place built well, equilibrium assignment examination student's test site, examination Vehicle can also randomly choose same section's purpose difference test site according to jam situation, this is all to allow in examination process 's.So, test subject examination hall and student and the corresponding information of car three must just be obtained by realizing the tracking of certain student examination. Examination student's vehicle and the integrated information of test subject place allocation table three are as shown in table 1：

Sequence number	Student	Test subject place	Examine number plate
				1	First	Stop A for side	001
2	First	Right-angled bend B	001
				3	Second	Stop B for side	002
...	...	...	...

Table 1

By database manipulation, the exam information of all place driving paths of a certain student can be screened, as Carry out the location information source of a certain student's video tracking.

3rd, overall section purpose video location

Camera pan-tilt used in the present invention is general holder, can support that the platform of PELCO-P agreements can. PELCO-P agreements are general holder control protocol, are widely used in camera pan-tilt control.The control word of the agreement such as table Shown in 2：

Byte 1

Byte 2

Byte 3

Byte 4

Byte 5

Byte 6

Byte 7

Sync byte

Address code

Instruction code 1

Instruction code 2

Numeric data code 1

Numeric data code 2

Check code

Table 2

The protocol data form for 1 start bit, 8 data bit, no parity check position, baud rate 2400B/S.

The instruction code and numeric data code specification of the agreement are concentrated in the puppy parc and are illustrated, and are not being repeated herein.The association View is supported to set 1-64 preset point.So-called preset point, that is, preserve camera position information, when to holder send call instruction When, video camera turns to preset point and is shot.The setting and call instruction of 1-32 preset points are as shown in Table 3 and Table 4：

Byte 1

Byte 2

Byte 3

Byte 4

Byte 5

Byte 6

Byte 7

Sync byte

Address code

00H

03H

00H

Preset period

Check code

Table 3

Byte 1

Byte 2

Byte 3

Byte 4

Byte 5

Byte 6

Byte 7

Sync byte

Address code

00H

07H

00H

Preset period

Check code

Table 4

33-64 preset points set and call control word as shown in table 5 below and table 6：

Byte 1

Byte 2

Byte 3

Byte 4

Byte 5

Byte 6

Byte 7

Sync byte

Address code

02H

FFH

Preset period

01H

Check code

Table 5

Byte 1

Byte 2

Byte 3

Byte 4

Byte 5

Byte 6

Byte 7

Sync byte

Address code

02H

FFH

Preset period

00H

Check code

Table 6

In conclusion being adjusted to video camera on the camera site of a certain subject starting first, then the position is defined For a preset point, and by the preset point and test subject information association.Then generated such as when there is student's selection to drive into the subject Information shown in table 7 below.

Sequence number	Student	Test subject place	Preset point	Examine number plate
					1	First	Stop A for side	01H	001
2	First	Right-angled bend B	02H	001
					3	Second	Stop B for side	03H	002
...	...	...	...	...

Table 7

When the student that takes an examination enters some subject, the signal that certain test subject starts examination is triggered.The signal is with student With examination car and test subject as search condition, a preset point will be uniquely positioned, obtains the period of the preset point, then The order for calling preset point is sent to video camera, then the shooting for entering certain test subject to examination vehicle can be achieved.

4th, in subject image track up

Under normal circumstances if the running distance of test subject is shorter, and section's purpose feelings can be completely covered in video camera Under condition, it may be considered that the track up for only setting the subject to originate.The driving conditions in subject can thus be recorded.If section Mesh running distance is longer, such as " hundred meters of plus-minus shelves ", " speed limit width-limited door " subject (truck examination needs to examine).Then it is contemplated that Spacing of being expert at is sowed discord every adding preset point on remote position, while according to the setting video camera rotating speed of subject speed.For pre- It is related still with the means of electronization examination to put the triggering of calling a little, if using differential satellite positioning method, can be with car Satellite positioning signal trigger signal as preset point location triggered of the traveling in subject.If using output switch parameter Judge the triggering that signal is called as preset point, then can choose on-off model distant in subject as triggering preset point Signal.In this way, video image of the vehicle in subject can be traced into.The implementation steps flow of the present invention is illustrated in fig. 1 shown below, Including：

S1, determines test subject initial position trigger signal；

S5, when car of taking an examination triggers subject commencing signal, calls preset point, forms image taking；

S7, is triggered according to signal in subject, calls preset point；

S8, Course Examination terminate, and wait and enter next subject；

S9, judges whether all subjects have all taken an examination, if it is, S10 is transferred to, if it is not, then returning to S5；

Present system is as follows：The present invention is using on-off model as subject initial signal, including with photosignal, Hall The on-off model sensors such as signal, pressure sensitivity cable are as section's purpose initial signal source.The characteristics of this kind of evaluation system, exists Easily set in initial signal, but need control centre or third party's data transmission equipment to realize initial signal and vehicle-mounted examination system Communication, so as to establish car, tester, the correspondence of test subject.This kind of field test system is not generally in examination field Multiple identical subjects, to avoid the confusion of tester, car and test subject in ground.

The triggering of this kind of test subject starting point is fairly simple, center control terminal can directly by network connection or RS232 connections obtain the on-off model in place from place signal switch board, to control if initial signal voltage changes State change from 0 to 1 occurs for the initial signal of center transmission processed, represents that vehicle comes into certain subject.It is straight by control centre Connect and preset point period is retrieved according to the contact of the data of subject, vehicle, tester.

Need to establish the contact of following information in database side, as shown in Fig. 2, 21 expression examination information of trainee in Fig. 2,22 Represent examination car information, 23 represent test subject place information, and 24 represent preset dot position information, and 25 represent satellite positioning scope Information, 26 represent tester, car, subject, preset point, satellite positioning scope contacts list.

The latitude and longitude information of the satellite positioning for car traveling of taking an examination need to only be sent back control centre by examination onboard system, by controlling The data service end at center processed retrieves preset point period in tables of data shown in 26 in fig. 2, is subsequently sent to prefabricated shooting Machine head.

It is attached between holder and control centre's video control machine using 485 buses, serial ports of computers can be used to carry out Output, command range can be used passive RS 232-485 interface equipment in 200 meters of distance ranges, distance 200 meters above for Ensure that active RS232-485 interface equipments can be used in the reliability of data transmission.Output data form is 1 start bit, 8 digits According to position, no parity check position, baud rate 2400B/S.The control process entirely controlled is as shown in Figure 3.

31 represent onboard system in Fig. 3, and 32 represent control centre's apps server, and 3 represent video monitoring server, 34 represent camera pan-tilt, and 35 represent database server.

Car-mounted computer (onboard system 31 includes car-mounted computer, further includes two Vehicular satellite locators in addition, Antenna, powered ups power supply etc.) satellite positioning precise information is transmitted to control centre's apps server 32, application program clothes Business device 32 combines the data that database 35 is retrieved, and determines preset point period, sends this data to video monitoring server 33, by The instruction for calling control point is sent to prefabricated tracking camera by 485 buses by video monitoring server 33.

With the continuous progress of video identification and shooting tracking technique, market has had and can carry out panorama tracking to certain vehicle With the camera system of autozoom, but the single cost of this kind of system is all more than ten thousand yuan, and if being directed to same vehicle Realize that smooth tracking also needs to carry out continuous machine learning.The present invention utilizes existing equipment and general letter in test site Single cradle head controllor realizes that a kind of vehicle tracking for place driving path is shot, and one kind is provided for place driving path New regulatory measure

Above-mentioned technical proposal is one embodiment of the present invention, for those skilled in the art, at this On the basis of disclosure of the invention application process and principle, it is easy to make various types of improvement or deformation, be not limited solely to this Invent the described method of above-mentioned embodiment, therefore previously described mode is simply preferable, and and without limitation The meaning of property.

Claims

A kind of 1. Camera Tracking System based on on-off model, it is characterised in that：It is described based on the shooting of on-off model with Track system includes the sensor that is arranged in test site and place signal switch board, is arranged on examination car onboard system, Database server, apps server and the video monitoring server of control centre are arranged on, and is arranged on examination field Camera pan-tilt in ground；

The sensor is arranged on the starting point of test subject；

The on-off model that the place signal switch board collection sensor produces；

Control centre obtains on-off model by network connection or RS232 connections from place signal switch board, if starting Signal voltage changes then occurs state change from 0 to 1 to the initial signal that control centre transmits, represent vehicle into Enter, control centre directly retrieves preset point period according to the contact of the data of subject, vehicle, tester.
2. the Camera Tracking System according to claim 1 based on on-off model, it is characterised in that：The sensor is adopted With photoelectric sensor, Hall sensor or pressure sensitivity cable sensor.
3. the Camera Tracking System according to claim 2 based on on-off model, it is characterised in that：The onboard system The latitude and longitude information of the satellite positioning for car traveling of taking an examination is sent back into control centre, by the database server of control centre in number According to preset point period is retrieved in table, video monitoring server is sent this data to, will be called and controlled by video monitoring server The instruction of system point is sent to preset camera pan-tilt, controls video camera on the camera pan-tilt into line trace.
4. the Camera Tracking System according to claim 3 based on on-off model, it is characterised in that：In the tables of data Including following information：Examination information of trainee, examination car information, test subject place information, preset dot position information, satellite positioning Range information, tester, car, subject, preset point, satellite positioning scope contacts list.
5. the Camera Tracking System according to claim 4 based on on-off model, it is characterised in that：The video camera cloud It is attached, is exported using serial ports of computers, such as using 485 buses between platform and the video monitoring server of control centre Fruit command range then uses passive RS 232-485 interface equipment in 200 meters of distance ranges, if distance is more than 200 meters Use active RS232-485 interface equipments；Output data form for 1 start bit, 8 data bit, no parity check position, baud rate 2400B/S。
6. the Camera Tracking System according to claim 5 based on on-off model, it is characterised in that：The video camera cloud Platform use can support the platform of PELCO-P agreements.
A kind of 7. shooting track side realized using any Camera Tracking Systems based on RFID signal of claim 1-6 Method, it is characterised in that：The described method includes：

S1, determines test subject initial position trigger signal；

S2, determines that video camera shoots the optimal camera position of each test subject, angle, using these information as holder preset point Storage, is waited to be called；

The place of S3, the examination car that examinee is selected, test subject and selection forms exam information base table, wait and preset point Information association；

S4, the test subject selected according to examination hall and place, establish examinee, examine car, selection subject and place, preset point joint letter Breath；

S5, when receiving on-off model, calls preset point, forms image taking；

S6, judges whether preset point in subject, if it is, S7 is transferred to, if it is not, then being transferred to S8；

S7, is triggered according to signal in subject, calls preset point；

S8, Course Examination terminate, and wait and enter next subject；

S9, judges whether all subjects have all taken an examination, if it is, S10 is transferred to, if it is not, then returning to S5；

S10, calls a preset point of dispatching a car, and video camera steering examines test ground and drives position of dispatching a car.