CN105261258A - System and method of camera tracking on the basis of switching signals - Google Patents

Abstract

The present invention provides a system and method of camera tracking on the basis of switching signals, belonging to the field of traffic management. The system of camera tracking on the basis of switching signals comprises a sensor and a place signal control cabinet arranged in an exam place, a vehicle system arranged on an exam vehicle, a database server, an application server and a video monitoring server arranged at a control center, and a camera holder arranged in the exam place. The sensor is arranged at the initial point of a subject of examination; the place signal control cabinet is configured to acquire the switching signals generated by the sensor; and the control center is configured to obtain the switching signals from the place signal control cabinet through network connection or RS232 connection, if the voltage of an initial signal is changed, the initial signal transmitted to the control center generates changes of states from 0 to 1 so as to represent the entrance of the vehicle, and the control center is configured to directly retrieve a point number of a preset point according to data association of the subject, the vehicle and the tester.

Description

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

Technical field

The invention belongs to field of traffic control, be specifically related to a kind of Camera Tracking System based on on-off model and method.

Background technology

Vehicle driver subject two examination is commonly called as place driving path, and driver need complete some subject sides of the Ministry of Public Security " 123 " command requirement for passing the examination in test site.Rank difference is driven according to the vehicle driver standard that driver applies, the subject completed is also different, driving rank as standard is C1, then need in test site, complete " reversing warehouse-in ", " slope road vehicle positioning stop and starting ", " lateral parking ", " right-angled bend " four subjects.Along with improving constantly of people's living standard, the student carrying out vehicle driver examination also increases year by year, and the difficulty of examination supervision is also in continuous increase.For preventing student from impersonating, arranging the behaviors such as normal place malpractices, constantly introducing as means such as fingerprint individual verification, examination process pan-shots in examination hall in examination hall.But these means still have some shortcomings, the student much left things to chance still finds the leak of some test sites, provides convenient for practicing fraud in its examination process.

The examination system that the area that present China has realized place driving path electronization examination uses all requires the function that the configuration video monitoring of the vehicle-mounted computer in car and video file are uploaded.Meanwhile panoramic camera is set in test site, takes and record the testing situations of all vehicles in test site, and be uploaded to the function of supervision center.The problem of monitoring that these means largely solve in examination car and car is taken an examination outward, but the examination all-the-way tracking of a certain examination student or a certain vehicle is still come with some shortcomings.Monitoring driving people face and identity as the video monitoring image in car, what outdoor panoramic camera was observed is all vehicles and all subjects, still there is very large deficiency in its level of detail, even if having The Cloud Terrace to carry out remote control, but focal position and dead angle, place still can cause the unintelligible or leaky of video capture.

Other one deck meaning of examination video monitoring is to be supervised by video, and the False Rate in examination hall is reduced.So-called erroneous judgement refers to because place signal is disturbed, cause the test site do not possessed under examination condition in examination process, create the judgement of mistake to vehicle driver, thus cause its mistake by deduction mark or the situation that mark should be deducted but not by deduction corresponding scores.This all likely occurs in any one electronization examination process, such as on-off model is adopted to be the test site of judgment basis, reason of its erroneous judgement has more the impact that the existing sensor such as photoelectricity, Hall arranged in the venue is subject to weather or human factor, as snowflake, fallen leaves, motor-vehicle tail-gas to the interference of photosignal for another example strong wind Hall element Deccan is disturbed.The electronic test site of a new generation uses differential GPS as signal judging basis, but also can be subject to the impact of the factor such as cloud layer, GPS drift.There occurs erroneous judgement and will produce dispute, so can take measures to be corrected to erroneous judgement by video monitoring and human intervention, be also the information source of examination equipment being carried out to error correction and adjustment simultaneously.And the monitoring of this respect be test site panoramic shooting or examination car in shooting be all be difficult to meet as judgment basis.

Summary of the invention

The object of the invention is to solve the difficult problem existed in above-mentioned prior art, a kind of Camera Tracking System based on on-off model and method are provided.

The present invention is achieved by the following technical solutions:

A kind of Camera Tracking System based on on-off model, comprise sensor and the place signal switch board be arranged in test site, be arranged on onboard system, the database server being arranged on control center, apps server and the video monitoring server of taking an examination on car, and be arranged on the camera pan-tilt in test site;

Described sensor setting is in the starting point of test subject;

The on-off model that described place signal switch board pick-up transducers produces;

Control center is connected by network or RS232 connects from place signal switch board acquisition on-off model, if start signal voltage changes, there is the state change from 0 to 1 in the start signal to control center's transmission, represent that vehicle enters, control center directly retrieves preset point period according to the Data relationship of subject, vehicle, tester.

Described sensor adopts photoelectric sensor, Hall element or pressure sensitivity cable sensor.

The latitude and longitude information of the satnav that examination car travels is sent back control center by described onboard system, in tables of data, preset point period is retrieved by the database server of control center, these data are sent to video monitoring server, by video monitoring server, the instruction of calling reference mark is sent to preset camera pan-tilt, the video camera controlled on this camera pan-tilt is followed the tracks of.

Described tables of data comprises following information: examination information of trainee, examination car information, test subject place information, preset point positional information, satnav range information, tester, car, subject, preset point, satnav scope contacts list.

485 buses are adopted to connect between described camera pan-tilt and the video monitoring server of control center, serial ports of computers is used to export, if command range, in 200 meters of distance ranges, uses passive RS 232-485 interfacing equipment, if distance is more than 200 meters, use active R S232-485 interfacing equipment; Exporting data layout is 1 start bit, 8 bit data positions, no parity check position, baud rate 2400B/S.

Described camera pan-tilt adopts the platform can supporting PELCO-P agreement.

Utilize the described camera tracking method realized based on the Camera Tracking System of RFID signal as follows:

S1, determines test subject reference position trigger pip;

S2, determines that the best camera position of each test subject taken by video camera, angle, these information is stored as The Cloud Terrace preset point, waits to be called;

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

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

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

S6, judges whether to exist preset point in subject, if so, then proceeds to S7, if not, then proceeds to S8;

S7, triggers according to signal in subject, calls preset point;

S8, Course Examination terminates, and waits for and enters next subject;

S9, judges whether all subjects take an examination all, if so, then proceeds to S10, if not, then return S5:

S10, calls a preset point of dispatching a car, and video camera turns to be examined test ground and drive and to dispatch a car position.

Compared with prior art, the invention has the beneficial effects as follows: the test subject that the present invention travels according to vehicle driver, in conjunction with taking an examination Design of Signal and achieve a kind of outdoor with the seizure of monopod video camera and image trace device in place, can effectively to a certain vehicle or a certain student the car body action in examination process take.It is advantageous that and can take for the examination overall process of a certain examination car or driver, examination process can be linked up with the exam information of student and file.

Accompanying drawing explanation

The step block diagram of Fig. 1 the inventive method

The database information structural drawing of Fig. 2 present system

The control structure figure of Fig. 3 present system.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in further detail:

The solution of the present invention is specific as follows:

The location of scene of the first, making a video recording

The test site of place driving path is made up of some test subjects, and these test subjects are organized in together according to certain route, has road in examination hall to connect between two different subjects, finally forms a loop.Namely examinee from starting point start examination turning to starting point by all subject rear vehicle.Vehicle can trigger this section's object start signal when entering each test subject.The form of current start signal has a lot, is roughly divided into three classes.The first kind is RFID signal: vehicle reads by the RFID card reader be arranged on examination car the RFID radio-frequency card signal be arranged in test subject when entering subject, thus identifies this test subject and start.Equations of The Second Kind is on-off model, identifies section's object start by the triggering being arranged on the on-off model such as the photoelectricity before test subject, Hall, Magnetic Sensor, pressure sensitivity cable.3rd class is satellite positioning signal, comprises GPS, the Big Dipper, Ge Luonasi etc., and this kind of differential GPS signal be arranged on examination car drives within the scope of the test subject that presets and then represents that this test subject starts.Beginning mode no matter in which kind of test subject, its object is all demarcated a commencing signal, thus makes no matter to be the process that the signal pickup assembly be also mounted on car body be arranged on place carries out judging.From the angle of supervision, test start signal designates the position at examination car place, before and after this position, error normal conditions are no more than 20CM, the subject start signal error of on-off model is used to be almost 0, use RFID to be less than 20CM as the error of start signal, use the error of differential satellite positioning signal to be generally no more than 5CM.The video camera so also following the tracks of to needs provides positional information to a certain degree.When a certain vehicle triggers test subject commencing signal, camera lens can be positioned accurately this test subject region.

The second, with the associating of examinee and car information of taking an examination

Following the tracks of for the shooting of certain examination vehicle and certain examination student to realize camera, first must obtain subject and the place information of certain student examination.In a comprehensive driving path examination hall, place, often to there is multiple identical subject, match with the examination car of reequiping in advance.Such as " side parking " subject is test time the longest subject, then accordingly in an examination hall, arrange parking stall, multiple side, and right-angled bend is examination used time the shortest subject, then the place of this test subject is just relatively less.If examination vehicle is many, then consider the number in suitable increase subject examination hall, the smoothness of taking an examination can be ensured like this, prevent most student from stopping on examination road, wait for the situation of test subject.

Control center can according to the test subject place built well, equilibrium assignment examination student test site, and examination vehicle also can according to the different test site of jam situation Stochastic choice same section object, and this is all allow in examination process.So, the tracking realizing certain student examination just must obtain information corresponding to test subject examination hall and student and car three.The integrated information of examination student's vehicle and test subject place allocation table three is as shown in table 1:

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

Table 1

By database manipulation, the exam information of all for a certain student places driving path can be screened, as the locating information source of carrying out a certain student's video tracking.

Three, overall section object video location

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

Byte 1

Byte 2

Byte 3

Byte 4

Byte 5

Byte 6

Byte 7

Sync byte

Address code

Order code 1

Order code 2

Numeric data code 1

Numeric data code 2

Check code

Table 2

This protocol data form is 1 start bit, 8 bit data positions, no parity check position, baud rate 2400B/S.

The order code of this agreement and numeric data code specification are concentrated at this puppy parc explanation, is not repeating at this.This agreement support arranges 1-64 preset point.So-called preset point, namely preserves camera position information, and when sending call instruction to The Cloud Terrace, video camera turns to preset point to take.The setting of 1-32 preset point and call instruction be 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 point arranges and calls control word as shown in following table 5 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 sum, first video camera is adjusted on the initial camera site of a certain subject, then this position is defined as a preset point, and by this preset point and test subject information association.Select when there being student then to generate information as shown in table 7 below when sailing this subject into.

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

Table 7

When the student that takes an examination enters some subjects, trigger the signal that certain test subject starts to take an examination.This signal, using student and examination car and test subject as search condition, uniquely will be located a preset point, obtain the period of this preset point, and then send to video camera and call the order of preset point, then can realize shooting examination vehicle being entered to certain test subject.

Four, the track up of image in subject

If generally the running distance of test subject is shorter, and under video camera can cover this section's object situation completely, can consider only to arrange the initial track up of this subject.So just can record the driving conditions in subject.If subject running distance is longer, as the subject such as " hundred meters add downshift ", " speed limit width-limited door " (truck examination needs examination).Then can consider to set up preset point on the position that running distance interval is far away, video camera rotating speed is set simultaneously according to subject speed.The triggering of calling for preset point is still correlated with the means of electronization examination, if adopt differential satellite locator meams, then can travel the trigger pip of the satellite positioning signal in subject as preset point location triggered by vehicle.If the triggering adopting the decision signal of output switch parameter to call as preset point, then can choose on-off model distant in subject as the signal triggering preset point.Like this, the video image of vehicle in subject can be traced into.Implementation step flow process of the present invention is illustrated in fig. 1 shown below, and comprising:

S1, determines test subject reference position trigger pip;

S2, determines that the best camera position of each test subject taken by video camera, angle, these information is stored as The Cloud Terrace preset point, waits to be called;

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

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

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

S6, judges whether to exist preset point in subject, if so, then proceeds to S7, if not, then proceeds to S8;

S7, triggers according to signal in subject, calls preset point;

S8, Course Examination terminates, and waits for and enters next subject;

S9, judges whether all subjects take an examination all, if so, then proceeds to S10, if not, then return S5;

S10, calls a preset point of dispatching a car, and video camera turns to be examined test ground and drive and to dispatch a car position.

Present system is as follows: on-off model as subject start signal, comprises using on-off model sensors such as photosignal, hall signal, pressure sensitivity cables as section's object start signal source by the present invention.The feature of the evaluation system of this class is that start signal is easily arranged, but needs control center or third party's data transmission equipment to realize the communication of start signal and vehicle-mounted examination system, thus establishes the corresponding relation of car, tester, test subject.The general not multiple identical subject in test site of the field test system of this class, to avoid the confusion of tester, car and test subject.

The triggering of this kind of test subject starting point is fairly simple, center control end can directly be connected by network or RS232 connects the on-off model obtaining place from place signal switch board, if start signal voltage changes, there is the state change from 0 to 1 in the start signal to control center's transmission, represents that vehicle has entered certain subject.Directly preset point period is retrieved according to the Data relationship of subject, vehicle, tester by control center.

The contact establishing following information is needed in database side, as shown in Figure 2, in Fig. 2,21 represent examination information of trainee, 22 represent examination car information, 23 represent test subject place information, 24 represent preset point positional information, and 25 represent satnav range information, and 26 represent tester, car, subject, preset point, satnav scope contacts list.

The latitude and longitude information of satnav that examination car travels only need be sent back control center by examination onboard system, retrieves preset point period in tables of data shown in 26 in fig. 2, be then sent to prefabricated camera pan-tilt by the data, services end of control center.

485 buses are adopted to connect between The Cloud Terrace and control center's video controller, serial ports of computers can be used to export, command range can use passive RS 232-485 interfacing equipment in 200 meters of distance ranges, distance more than 200 meters in order to ensure that the reliability that data transmit can use active R S232-485 interfacing equipment.Exporting data layout is 1 start bit, 8 bit data positions, no parity check position, baud rate 2400B/S.The control procedure of whole control as shown in Figure 3.

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

(onboard system 31 comprises truck-mounted computer to truck-mounted computer, also comprise two Vehicular satellite steady arms in addition, antenna, powered ups power supply etc.) transmit satnav precise information to control center's apps server 32, the data that apps server 32 is retrieved in conjunction with database 35, determine preset point period, these data are sent to video monitoring server 33, by video monitoring server 33, the instruction of calling reference mark is sent to prefabricated tracking camera by 485 buses.

Along with video identification and the continuous progress of shooting tracking technique, there has been the camera system can carrying out panorama tracking and autozoom to certain vehicle in market, but the single cost of this type systematic is all more than ten thousand yuan, and if realize smooth tracking for same vehicle and also need to carry out continuous machine learning.The present invention utilizes existing equipment and general simple cradle head controllor in test site to realize the shooting of a kind of vehicle tracking for place driving path, for place driving path provides a kind of new regulatory measure

Technique scheme is one embodiment of the present invention, for those skilled in the art, on the basis that the invention discloses application process and principle, be easy to make various types of improvement or distortion, and the method be not limited only to described by the above-mentioned embodiment of the present invention, therefore previously described mode is just preferred, and does not have restrictive meaning.

Claims (7)

1. the Camera Tracking System based on on-off model and method, it is characterized in that: the described Camera Tracking System based on on-off model comprises sensor and the place signal switch board be arranged in test site, is arranged on onboard system, the database server being arranged on control center, apps server and the video monitoring server of taking an examination on car, and is arranged on the camera pan-tilt in test site;

Described sensor setting is in the starting point of test subject;

The on-off model that described place signal switch board pick-up transducers produces;

Control center is connected by network or RS232 connects from place signal switch board acquisition on-off model, if start signal voltage changes, there is the state change from 0 to 1 in the start signal to control center's transmission, represent that vehicle enters, control center directly retrieves preset point period according to the Data relationship of subject, vehicle, tester.

2. the Camera Tracking System based on on-off model according to claim 1, is characterized in that: described sensor adopts photoelectric sensor, Hall element or pressure sensitivity cable sensor.

3. the Camera Tracking System based on on-off model according to claim 2, it is characterized in that: the latitude and longitude information of the satnav that examination car travels is sent back control center by described onboard system, in tables of data, preset point period is retrieved by the database server of control center, these data are sent to video monitoring server, by video monitoring server, the instruction of calling reference mark is sent to preset camera pan-tilt, the video camera controlled on this camera pan-tilt is followed the tracks of.

4. the Camera Tracking System based on on-off model according to claim 3, is characterized in that: described tables of data comprises following information: examination information of trainee, examination car information, test subject place information, preset point positional information, satnav range information, tester, car, subject, preset point, satnav scope contacts list.

5. the Camera Tracking System based on on-off model according to claim 4, it is characterized in that: between described camera pan-tilt and the video monitoring server of control center, adopt 485 buses to connect, serial ports of computers is used to export, if command range, in 200 meters of distance ranges, uses passive RS 232-485 interfacing equipment, if distance is more than 200 meters, use active R S232-485 interfacing equipment; Exporting data layout is 1 start bit, 8 bit data positions, no parity check position, baud rate 2400B/S.

6. the Camera Tracking System based on on-off model according to claim 5, is characterized in that: described camera pan-tilt adopts the platform can supporting PELCO-P agreement.

7. utilize the arbitrary described camera tracking method realized based on the Camera Tracking System of on-off model of claim 1-6, it is characterized in that: described method comprises:

S1, determines test subject reference position trigger pip;

S2, determines that the best camera position of each test subject taken by video camera, angle, these information is stored as The Cloud Terrace preset point, waits to be called;

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

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

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

S6, judges whether to exist preset point in subject, if so, then proceeds to S7, if not, then proceeds to S8;

S7, triggers according to signal in subject, calls preset point;

S8, Course Examination terminates, and waits for and enters next subject;

S9, judges whether all subjects take an examination all, if so, then proceeds to S10, if not, then return S5;

S10, calls a preset point of dispatching a car, and video camera turns to be examined test ground and drive and to dispatch a car position.