User manual – rev00214
Contents
1. Time User Action IP 12 42 58 Metrici ADMIN metricinmetrici ro LOGIN ere 13 06 20 Metrici ADMIN metriciimetrici ro ADD LOCATION Demo location ih 13 47 12 Metrici ADMIN metriciiimeticiro ADD CAMERA Demo camera INTO Demo location LOCATION iii 2072 Metrici All rights reserved Version 1 8 www metrici ro Pagina 17 26 metrici Metrici LPR Freeflow User manual rev 00214 May 2013 The Cars menu offers the possibility to view the list of recognized license plate numbers having a recognition probability greater than or equal to the value set in the Administration menu Setup Submenu Filtration can be done by date country code location or camera Only locations and cameras for which the user has viewing rights are displayed Metrici ADMIN EE metrici LPR Find plate Reports Administration Logs Logout JUGAR E 2013 03 29 Calendar SETA Location fee ALL Plate number Plate Country Time Location Camera RO 16 14 28 Test version 2 0 B 9 8 C N N Be98 RO 16 14 22 Test version20 RO 16 14 16 Test version29 arimage RO 16 14 05 Test version 2 0 RO 16 14 04 Test version 2 0 RO 16 14 04 Test version 2 0 RO 16 13 38 Test version 2 0 RO 16 13 29 Test version 2 0 RO 16 13 29 Test version 2 0 RO 16 13 24 Test version 2 0 RO 16 13 20 Test version 2 0 RO 16 12 42 Test version 2 0 RO 16 12 34 Test version 2 0 RO 16 12 33 Test version 2 0 RO 16 12 05 Test version 2 0 RO 16 12 01 Test versio2. metrici Metrici LPR Freeflow User manual rev 00214 May 2013 number last seen VLO7UJO 2012 10 01 12 39 07 VLO7UJO 2012 10 01 16 34 04 VLO7UJO 2012 10 09 15 48 30 VLO7UJO 2012 10 09 20 28 41 VLO7UJO 2012 10 10 10 48 10 5 rows in set 0 00 sec Also it is very easy to find out the number of cars that passed through the same entrance two days before mysql gt SELECT COUNT plates number FROM plates cameras WHERE DATE plates last_ seen DATE SUB CURDATE INTERVAL 2 DAY AND probability gt 0 5 AND plates camera_id cameras id AND cameras name Intrare Splai COUNT plates number 388 1 row in set 0 09 sec On request we can provide other types of connection interfaces e g using HTTP protocol using GET methods www metricl ro Pagina 26 26
3. IP_ ADDRESS io new_plate_event php If the administration and reporting interface is installed on the same computer with the analysis application IP ADDRESS is set to 127 0 0 1 Check action URL address of the script where actions to be taken when a number is recognized are checked The 3 actions can be configured via the administration and reporting interface and they include opening barriers sending emails posting of a popup message on screen Format _http IP ADDRESS io check_action php If the administration and reporting interface is installed on the same computer with the analysis application IP_ADDRESS is set to 127 0 0 1 Check action minimum probability minimum probability for each number recognized from which the checking operation of actions to be taken for that number are initiated Generally it is preferable to use a value gt 0 5 Reporting check action authkey id these two values are generated by the reporting and administration interface when adding a new camera With their help authentication of communication between the analysis and reporting applications is fully automatic and bidirectional enabling secure communication over insecure networks and Internet The third section refers to various internal settings of the analysis application and includes the following fields Same plate delay the time measured in seconds that the analysis application waits the recurrence in the frame of the same lice
4. When it is restored it sends at full speed all locally stored data to the reporting and administration application Attention Over the connectivity downtime verification of actions to be taken for each license plate number can not be done and therefore for example barrier opening will not work Q Shortly after starting the analysis application it turns off by itself What is the cause A This behavior is due to the absence or malfunction of the HASP license key Please check that the key is correctly connected to one of the USB ports of the analysis computer and that the red LED in its end is lit Key operation can be checked by accessing it with a web browser e g Mozilla Firefox on your analysis computer address http localhost 1947 If the key is not detected enter the HASP key in another USB port www metricl ro Pagina 24 26 metrici Metrici LPR Freeflow User manual rev 00214 May 2013 ea ANNEX 2 External queries Metrici LPR stores data obtained in a MySQL relational database Information such as license plate numbers times when they were seen countries of origin locations photos of cars and of recognized license plate etc can be found easily by a human operator through embedded administration and reporting interface For cases which require integration with management ERP third party solution you can send queries directly to the database server via a SQL TCP IP connection which runs on the 3306
5. countries e Distributed operation multiple cameras in multiple locations with centralized reporting and administration e 3 actions defined for each recognized license plate number opening barriers sending warning e mails popup display on screen e Multi user reporting and administration interface with secure access and viewing rights for each location and user e Multi threading operation with autoranging based on the number of cores threads available Metrici LPR can be used day or night for traffic monitoring systems tolling and vignette control systems parking access control border monitoring industrial weighing systems outdoor advertising auditing gas stations and many other applications stream view T B29NTW 7 B65 SDE Piate number CC First seen _ Last caan Pro P 2507 AH Plate number CC Festseen www metrici ro Pagina 2 26 metrici Metrici LPR Freeflow User manual rev 00214 May 2013 The system can be configured flexibly as needed At the functional level it consists of 3 interconnected blocks ACQUISITION PROCESSING ADMINISTRATION AND REPORTING An example of a technical structure for a client who owns 3 locations can be seen in the following scheme LOCATIA 1 i i LOCATIA 2 i 2 i Gg Reflector IR oe m Camera IP Camera IP p Reflector IR Camera IP a aii Poarta 2 gt Poarta 1 i Switch PoE
6. plate number in the list you can see the total number of events the number of events of the current day the current week and this month Also it is possible to quickly define an action open barrier send email popup display or to modify the existing one Metrici ADMIN mm metrici PA Cars Reports Administration Logs Logout Cars each hour Filter From To Max results 20 clara Plate number Country Total events Today events This week events This month events Actions list Cars each month RO 91 11 45 262 Add RO 67 11 36 247 Add RO 54 6 27 111 Edit RO 53 7 25 156 Add RO 40 8 20 120 Add B 86 WBY RO 38 5 18 99 Add RO 32 4 15 a4 Add RO 3 4 16 78 Add RO 29 4 13 91 Add RO 29 5 12 101 Add RO 28 5 13 81 Add RO 27 5 11 100 Add RO 25 4 13 80 Add RO 25 2 11 62 Add RO 25 2 8 90 Add B 47 FXJ RO 23 3 11 65 Add RO 22 5 12 51 Add RO 22 3 11 40 Add RO 22 6 14 69 Add RO 21 4 11 64 Add 2012 Metrici All rights reserved Version 1 8 El www metrici ro Pagina 23 26 metrici Metrici LPR Freeflow User manual rev 00214 May 2013 ANNEX 1 Frequently Asked Questions Q What happens if the data communication between the analysis application and the reporting and administration application is interrupted for a while A In such cases the analysis application stores locally the data processed license plate numbers timestamps photos etc indefinitely and continuously monitors the state of the data connection
7. vehicles e g front view from low height at small angles as against the horizontal Along with a shutter time adjusted to the type of application you must also configure accordingly other operating parameters of the video camera We recommend to use a gain value as small as possible and to disable edge enhancement WDR and backlight correction features The video camera and IR illuminator should be placed as close to each other as possible Due to www metrici ro Pagina 7 26 metrici Metrici LPR Freeflow User manual rev 00214 May 2013 the retro reflectivity feature of the license plates a light beam sent from a certain angle to a plate number is reflected back in the same direction For this reason it is not necessary to mount the acquisition assembly with the view direction perpendicular to the registration number plane A common practice is to place the two units one under the other on a column with a height of 1 3 m 1 2 m near the path of motor vehicles Slopes of 20 degree of the registration number are allowed in any direction as to the video camera vision horizontal In cases where constant artificial shadow in the detection area can not be ensured special attention will be given to camera positioning in relation to the sun Avoid as much as possible its positioning parallel to the east west direction due to the unpleasant effects occurring at sunset or sunrise when the sun is near the horizon Al
8. RL Open barrier URL Demo camera 15 BIESSO29 Delete u By accessing the Setup submenu of the Administration menu the following parameters can be changed e Owner s name e Minimum probability displayed number plates recognized with a probability below this value will not be displayed e Language e E mail address e mail from where alerts are sent automatically according to the actions defined for each license plate number www metrici ro Pagina 16 26 IL Metrici LPR Freeflow User manual metrici rev 00214 May 2013 LPR e Show original plate if checked it will display both the reconstructed license plate number and its processed image Metrici ADMIN als metric LPR Find plate Cars Reports Administration Logs Logout sen Owner s name Demo ANPR SRL Locations amp Cameras Minimum probability dis played 0 5 E mail address Ipralertiimetriciro Setup Ee Show original plate hg 2012 Metrici All rights reserved Version 1 8 Attention The Administration menu is not visible to users who do not have the Admin checkbox ticked By accessing the Logs menu you can see the list of operations performed by users filtering being possible both by display date and by user Users without admin rights can only view personal operations logs J F Metrici ADMIN ei metrici LER Cars Reporis Administration E Logout ALEAR 2013 05 29 Calendar C1 E Metrici ADMIN metrici metrici ro
9. al rev 00214 May 2013 By accessing the Cars each day report you can view the total number of cars and the number of unique cars values consolidated on the reporting period days Metrici ADMIN mm metrici 1 Find plate Cars Administration Logs Logout Cars each hour imme eee 13 05 22 Calendar i tA 2013 05 79 Calendar Cars each day from 2013 05 22 to 2013 05 29 Cars 34799 total Unique cars 31682 total 5 900 Top cars 5 210 4 720 4 130 3 540 2 950 2 360 1 770 1 180 590 0 oy a qP ap 2012 Metrici All rights reserved Version 1 8 www metricl ro Pagina 21 26 metrici Metrici LPR Freeflow User manual rev 00214 May 2013 The Cars each month report shows a similar situation to the Cars each day report but consolidated on the months included in the reporting period Metrici ADMIN m metrici Cars each hour aA 2013 f January ars 2013 Cars each month Top cars Cars each month from 2013 January to 2013 May Cars 406759 total Unique cars 191480 total 145 400 130 860 116 320 101 780 87 240 72 700 28 160 43 620 29 080 14 540 7 By D a gt AP 7 Ba 2012 Metrici All rights reserved Version 1 8 www metrici ro Pagina 22 26 metrici Metrici LPR Freeflow User manual rev 00214 May 2013 The last report Top cars shows the list of cars that have passed most frequently through the detection zone For each license
10. ame computer The ADMINISTRATION and REPORTING block consists of a web interface application that receives data from the analysis application and can display them in a user friendly way This application can be located on one of the computers for ANALYSIS or a completely independent computer Between the PROCESSING and ADMINISTRATION AND REPORTING blocks there is no need to have IP connectivity on the local network it is sufficient to have a public network allowing traffic on port 80 www metrici ro Pagina 4 26 metrici Metrici LPR Freeflow User manual rev 00214 May 2013 CHAPTER 2 Constructive details and instructions for installation and use CHAPTER 2 1 AQUISITION block Video stream acquisition can be done with IP cameras that are able to deliver MJPEG stream through the HTTP protocol For the best possible detection the video cameras must be infrared sensitive IR and to have IR illumination even during the day Also it is recommended to mount an additional MLPF filter Metrici Low Pass Filter with low visible light transmittance and high infrared transmittance see the the curve in the image P0 LET aj CRS E AA er pn ee eee ee B SG 89 23 1 n mses d00 600 600 700 ang 900 1000 1100 Image PO Characteristic curve of low visible light transmittance filter In this way the system will be much less exposed to illumination disturbances caused by strong sunlight or headli
11. essing the Administration menu then Locations amp Cameras Submenu By pressing the Add new location button you can define a new location which can then contain one or more capture cameras Metrici ADMIN gt ___ ed metrici LPR Cars Reports Administration Logs Logout User administration Add new location Locations amp Cameras Actions list m 2012 Metrici All rights reserved Version 1 8 After adding new locations you can define one or more cameras in that location by clicking on the name of the location and then clicking the Add new camera button www metrici ro Pagina 15 26 metrici Metrici LPR Freeflow User manual rev 00214 May 2013 P Metrici ADMIN TTET metrici PLPR Cars Reports Administration Logs Logout Locations amp Cameras Actions list 2012 Metrici All rights reserved Version 1 8 Add new camera for Demo location location Name Authkey autogenerated 8lE95029 Camera URL Open barrier URL The application will generate an authentication key Authkey and an ID that must be entered in the Settings window of the analysis application which will be connected to the camera metrici LPR User administration Locations amp Cameras Actions list Setup 20712 Metrici All rights reserved Version 1 8 Metrici ADMIN i Find plate Cars Reports Administration Logs Logout Demo location Edit ID Authkey Camera U
12. fic can be viewed by accessing the Reports menu The Cars each hour report shows the total number of cars and the number of unique cars by time of day You can choose the start and end date and the report type SUM hourly sum during the reporting period or AVERAGE hourly average during the reporting period If the start date is the same as the end date reporting on one day then SUM AVERAGE Metrici ADMIN metrici Find plate Cars Administration Logs Logout SO 2013 05 22 Calendarfiecm2013 05 29 Calendar Pap Cars each day Cars each hour SUM from 2013 05 22 to 2013 05 29 Cars each month Cars 34792 total Unique cars 29854 total 3 800 Top cars 3 420 3 040 2 660 2 280 1 900 1 520 1 140 760 380 D 1 2 3 4 a 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Z0 21 22 23 u 2012 Metrici All rights reserved Version 1 8 www metricl ro Pagina 19 26 IL Metrici LPR Freeflow User manual metrici rev 00214 May 2013 LPR Metrici ADMIN A metrici Ph Cars Administration Logs Logout SCM p20 13 05 22 Calendar SA tA 2013 05 29 Calendar uy AVERAGE Cars each hour Cars each hour AVERAGE from 2013 05 22 to 2013 05 29 Cars each month Cars 4339 average on day Unique cars 3723 average on day Top cars 200 450 400 aod 300 250 200 150 100 20 2012 Metrici All rights reserved Version 1 8 www metrici ro Pagina 20 26 metrici Metrici LPR Freeflow User manu
13. ghts www metricl ro Pagina 5 26 metrici Metrici LPR Freeflow User manual rev 00214 May 2013 Camera and illuminator selection When choosing a video camera and its related IR illuminator the following must be taken into account e The width of the license plate number in the image must be of at least 200 pixels so that recognition accuracy be as high as possible This means that a lower resolution but higher zoom camera or a high resolution but lower zoom camera can be used For guidance for a 1 Mpixel resolution camera maximum distances to vehicles monitored and thus license plate numbers may not exceed the following values Camera lens vs distance to plate number Maximum distance meters 10 20 25 30 Lens degrees 30 15 10 7 5 e When opting for a zoom camera or for narrow angle lens an IR illuminator with similar optical characteristics angle distance must be chosen For example we must not choose a 15 degree lens camera and an illuminator with 120 degree scattered light because this involves a reduced performance for the entire system e Image acquisition time shutter speed must be in accordance with monitored vehicle speed and lighting conditions We can choose a camera with low shutter speed slow only if the vehicles are moving slowly On the other hand a high shutter speed means a lower acquisition time and thus a smaller amount of light reaching the camera s sensor In all cases i
14. late min length pixels 180 Plate max length pixels 350 Open barrier URL http 192 168 2 23 cgi bin open php id 1 Cancel Save Settings About Quit The first section refers to the connectivity with the video camera and it includes the following fields e Input stream type with one of the following values e HTTP Mobotix MJPEG for Mobotix cameras e g M24 LPF e HTTP VLC MJPEG for video streams played back with the VLC application e HTTP Android MJPEG for cameras present on Android phones using the IP Webcam application www metricl ro Pagina 11 26 metrici Metrici LPR Freeflow User manual rev 00214 May 2013 e HTTP ACTi MJPEG for ACTi cameras e g KCM 5611 e HTTP AXIS MJPEG for AXIS cameras e g P1346 e HTTP HIKVISION MJPEG for Hikvision cameras e g DS 2CD855F E Input stream IP address IP address of the camera Port TCP listening port of the camera Input stream user user name to connect to the camera can be left blank if the camera does not have this option configured Input stream pass password to connect to the camera can be left blank if the camera does not have this option configured The second section relates to connectivity with the reporting system and consists of the following fields Reporting URL address of the reporting script where data of all recognized numbers and images associated to vehicles and number plates are sent Format http
15. late number in order to have a better recognition accuracy and to eliminate possible erroneous results For this reason both the choice of components forming the acquisition block cameras filters IR illuminators and their location have a crucial role in the overall performance of the LPR system and they must be treated with utmost care CHAPTER 2 2 PROCESSING block The processing block consists of one or more computers on which applications for analysis and recognition of license plates are installed and running Each interconnected video camera needs its own analysis application on the same computer multiple such applications can run simultaneously We recommend using computers with last generation Intel or AMD processors and avoiding the older generation AMD processors e g Phenom Il Athlon Il because they have do not have the SSE SSE2 instruction set fully implemented Every analysis application runs in multi threading mode and has autoranging option at startup depending on the number of threads allowed by the computer As a general rule the more execution threads available the more the analysis application will be able to run in real time with higher resolutions and more FPSs For guidance the analysis of a video stream with a resolution of 1 Mpixel at 5 fps needs 2 processor threads at 2 GHz and 1 GB RAM For example for a parking access application with two 1 Mpixel video cameras where cars are moving slowly or are stationed a
16. metrici Metrici LPR Freeflow User manual rev 00214 May 2013 Table of contents CHAPTER d System QESCNPH ON asrnane EE AATE E AEEA 2 CHAPTER 2 Constructive details and instructions for installation and USe ssssssssssrsesrrssrrerreesrresrrresrres 5 CHAPTER 2 1 AQUISITON BOG Ke sus hecita woes cates dinteumecomoiioraagiieinitelsetcbansgeaneubiasiianaesntoasaiunciuttei dssutuiderindanwends 5 CHAPTER 2 2 PROGESSING DIOCK virisesacarairshcastcctasennssanpanesaunnsu eE N AE 9 CHAPTER 2 3 ADMINISTRATION AND REPORTING BLOCK cccccccccsesseeeceeseeseseeesseeeeeeeesaaeeseeeees 14 ANNEX 1 Frequently Asked QUESTIONS cccccecccseecceeeeceeeeseeeeseeeeseeeeeeeesaeeeeaeeeeeeeeseeeeeeeeesaeeeseeessaeeeaeeranes 24 ANNEX 2 External QUEIIES iicncanictersnernscapinerensianendiawiuannrsinctenendsaiiiaas hianiianieraianissademurarimnrelianonginerenaninadits 25 www metrici ro Pagina 1 26 metrici Metrici LPR Freeflow User manual rev 00214 May 2013 CHAPTER 1 System Description Metrici LPR is a license plate recognition solution for plates mounted on vehicles licensed and labeled in accordance with standards existing in each country Main features e Free flow operation which involves real time analysis of video streams from IP capture cameras e Recognition of an unlimited number of license plates in the same picture frame e Syntax analysis and simultaneous recognition of license plates for several
17. n 2 0 RO 16 11 49 Test version 2 0 Events for this car RO 16 11 28 Test version 2 0 Today 0 This week 0 This month 1 RO 16 11 19 Test version 2 0 RO 16 1116 Test versinz0 Options for this plate number RO 16 1023 Test verion20 Addio Actions iet BG 16 10 21 Test version 2 0 RO 161018 Test version 2 0 RO 161015 Test version 2 0 RO 16 10 09 Test version 2 0 Cars 87 Unique cars 87 For every license plate number the table displays the recognized alphanumeric content country code the time when it was recognized location and camera The right side displays the reconstructed plate number and next to it the processed image of the number if this option was selected in the Administration menu Setup submenu You can find below the car photo and a few quick links to reporting and action defining If you click on the car photo or its number they can be viewed at the Original size without scaling as they were captured by the video camera www metricl ro Pagina 18 26 IL Metrici LPR Freeflow User manual metrici rev 00214 May 2013 LPR You can perform a quick search filling in the field in the blue box and clicking the Find plate button You can fill in only a part of the number and the system will search for and display all numbers matching that condition For example if you search for GL the system will return both the GL 17 VGN and the B 100 GLA or TR 34 AGL number Several synthetic reports on vehicle traf
18. ndicates a low recognition precision while red indicates an unrecognized number The upper right side presents the processed image of the last recognized number and below the alphanumeric content of that number In the lower right side there is a list of the last numbers recognized their country code first and last time of recognition and the probability of their recognition Recognition probability may vary between 0 and 1 the latter being the maximum possible value The more successive frames a license plate number is recognized in the probability value is more close to 1 After processing a single frame the maximum probability can not exceed a value of 0 5 By pressing the Settings button you can change at any time the analysis application execution settings as follows Metrici LPR v2 2 Input stream view Plates view Last detected plate G90 VNP GRQO0VNP Metrici LPR v2 2 Settings Input stream type HTTP ACTI MJPEG dal Input stream IP address 192 168 2 20 Port 80 cc First seen Last seen Prb Input stream user pass admin 123456 BG 16 18 48 16 18 48 0 75 RO 16 18 50 16 18 50 0 15 Reporting URL http 192 168 2 21 io new_plate_event php Check action URL http 192 168 2 22 i0 check_action php Check action minimum probability between 0 1 and 1 0 0 5 Reporting Check action authkey id 8301PA7R 14 Same plate delay seconds 10 P
19. nether Switch PoE ii Server Ha procesare y Server procesare PE esege PO INTERNET 3G ADSL FIBRA OPTICA ETC esssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssnnsssss een PETET Teese prssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssseiossssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssS tg LOCATIA 3 SEDIU CENTRAL Server procesare administrare i i raportare Switch PoE Ge IR Reflector IR A gt gt gt Camera IP Camera IP i Camera IP Camera IP i Poarta 1 J Poarta 2 3 Poarta 3 2 Poarta 4 www metricl ro Pagina 3 26 IAI Metrici LPR Freeflow User manual metrici rev 00214 May 2013 LPR The ACQUISITION block consists of one or more IP cameras one for each access point monitored and auxiliary equipment IR illuminators PoE switches etc The PROCESSING block consists of one or more computers containing software for real time analysis of incoming video streams received from the IP cameras Each interconnected camera needs its own analysis application Analysis applications are multi threading and therefore they work faster on multicore and or multiprocessor systems Multiple analysis applications can be used simultaneously on the s
20. nse plate number After this period the recognized number is sent to the reporting application and is removed from the list of detected numbers We www metricl ro Pagina 12 26 IAI Metrici LPR Freeflow User manual metrici rev 00214 May 2013 LPR recommended values of 1 2 seconds for traffic surveillance applications on public roads and higher values for parking access applications e Plate min length and plate max length minimum and maximum length that a license plate can have in the image A too low minimum value may cause wrong recognitions and a too high maximum value may lead to undue wasting of the processing power We recommend a minimum value greater than 200 pixels in order to have a recognition accuracy as good as possible e Open barrier URL address of the equipment controlling the barrier opening if present this field can be left blank Instead of a barrier a light signaling equipment or any device controlled through the HTTP protocol can be used If data visualization is done only through the reporting and administration interface the analysis application can be started with the nogui parameter In this mode the application does not display anything allowing its inclusion in shell scripts for automatic startup Also by not displaying the interface and the video stream from the camera it frees some of the processing power www metrici ro Pagina 13 26 User manual IAI Metrici LPR Freeflo
21. port For example to retrieve the list of cars that passed through Intrare Splai on October 9 2012 between 03 00 and 04 00 p m you can use a query such as mysql gt SELECT plates number plates last seen FROM plates cameras WHERE DATE plates last_ seen 2012 10 09 AND HOUR plates last_seen 15 AND probability gt 0 5 AND plates camera_id cameras id AND cameras name Intrare Splai number last seen MAI25176 2012 10 09 15 11 28 B38WSJ 2012 10 09 15 12 09 B65FWJ 2012 10 09 15 13 04 B88NTC 2012 10 09 15 14 36 BI6TNH 2012 10 09 15 26 36 B123ATI 2012 10 09 15 34 45 B101TMN 2012 10 09 15 32 55 B44DLV 2012 10 09 15 35 18 B93YSJ 2012 10 09 15 42 19 B67GNM 2012 10 09 15 47 35 B96BTU 2012 10 09 15 48 28 VLO7UJO 2012 10 09 15 48 30 B168EEN 2012 10 09 15 52 10 din eee a erica be ie ee ee a erm a 13 rows in set 0 09 sec Or to find the times when a car with the number VL 07 UJO was seen in the last 10 days at the same entrance you can use a query such as mysql gt SELECT plates number plates last_ seen FROM plates cameras WHERE plates number VLO7UJO AND DATE plates last_seen gt DATE SUB CURDATE INTERVAL 10 DAY AND probability gt 0 5 AND plates camera_id cameras id AND cameras name Intrare Splai www metricl ro Pagina 25 26
22. so the irregular shadows that can be dropped within the detection perimeter by buildings e g walkways stairs columns must be studied as they can affect recognition accuracy Some of these effects can be reduced by installing a MLPF 1 or MLPF 2 optical filter on the camera lens along with additional infrared illumination in daylight www metrici ro Pagina 8 26 metrici Metrici LPR Freeflow User manual rev 00214 May 2013 Depending on your needs you can choose CMOS or CCD sensor video cameras Cameras with CCD sensor usually have better sensitivity allowing higher values of the shutter speed without seriously altering the frame rate but they feature lower resolutions In return CMOS cameras typically have higher resolutions but a higher shutter speed also means a lower frame rate For applications where the relative speed of the vehicles is not very high and distances are of the order of several meters e g parking access points with barrier our recommendation is to choose a moderate zoom CMOS sensor camera For applications where speeds are high we recommend choosing a camera with CCD sensor and high zoom to compensate for the lower resolution of the sensor The frame rate of the images from the stream produced by the video camera is more important the higher the relative speed of vehicles in relation to the point of measurement is The analysis application needs an average of 2 3 frames containing the same license p
23. t is very important that the license plate numbers have a very clear image no blur whatever the lighting conditions are in that point of measurement A common mistake is to configure the assembly during the day without taking into account the lighting conditions in the evening or night The distance traveled by a car moving at a speed of 50 km h as against the point of measurement is 13 88 m every second For a camera with a shutter speed set to a value of 1 30 sec this means that during the acquisition of an image frame the car and thus the plate number has moved 0 46 m This distance translates into a blurred image and into the impossibility of accurately recognizing characters that make up the license plate number An example of an incorrect configuration of these parameters can be seen in image P2 www metrici ro Pagina 6 26 rev 00214 May 2013 metrici Metrici LPR Freeflow User manual For guidance depending on the relative travelling speed of the vehicle we recommend the following minimum values for the shutter speed Shutter speed Car speed 10 km h 30 km h 50 km h Shutter speed 1 250 s 1 500 s 1 1000 s When you can not increase the shutter speed high enough an alternative solution is to reduce the relative speed of the vehicle as much as possible in the image as against the point of measurement This can be done by changing the angle of the camera as against the direction of travel of the
24. t the barrier one computer having an INTEL i3 processor and 2 GB RAM can be used e g INTEL NUC and for an application to monitor car traffic on public roads with 4 2 Mpixel and 10 fps cameras you can use a server having INTEL Xeon www metricl ro Pagina 9 26 metrici Metrici LPR Freeflow User manual rev 00214 May 2013 E5 2670 processor and 8 GB RAM Recommended Cameras Cameras Cameras hardware 1 2 3 6 7 10 Processor Core i3 3217 Xeon E3 1275 Xeon E5 2670 Memory 4 GB 8 GB 16 GB Storage 32 GB mSATA SSD 2 x 250 GB SATA RAID 1 2 x 500 GB SATA RAID 1 Power consumption Sizes Operating system Reccomended model 50 W Ultra compact 10 cm x 7 2 cm Linux Fedora Core Centos Debian Intel NUC 300 W 1U Linux Fedora Core Centos Debian HP DL 120 G7 500 W 1U Linux Fedora Core Centos Debian HP Proliant DL 360 and its analysis results an The main interface of the application allows you to view real time video stream from the camera nput stream view 0A 7 oe Metrici LPR v2 2 BOLYFL BOLYFL 1920 x 1072 z Settings Detected plat Plate number CC First seen Last seen Prb Last detected B 01 YFL RO 16 24 31 16 24 31 1 About Quit www metrici ro Pagina 10 26 IL Metrici LPR Freeflow User manual metrici rev 00214 May 2013 LPR A precisely recognized license plate number is framed in green A yellow framing i
25. w metrici rev 00214 May 2013 CHAPTER 2 3 ADMINISTRATION AND REPORTING BLOCK The ADMINISTRATION and REPORTING block consists of a web interface application that receives data from the analysis application and can display them in a user friendly way This application can be located on one of the computers for ANALYSIS or a completely independent computer Between the PROCESSING and ADMINISTRATION AND REPORTING blocks there is no need to have IP connectivity on the local network it is sufficient to have a public network allowing traffic on port 80 The first time you access this interface you must use the following login E mail metrici metrici ro Password metriciadmin metrici E mail metrici metrici ro Password eeeceecee Login For security reasons please change this password after logging in by accessing the Administration menu and then clicking User Administration submenu www metrici ro Pagina 14 26 metrici Metrici LPR Freeflow User manual rev 00214 May 2013 Metrici ADMIN metrici ma Find plate Cars Reports Administration Logs Logout User administration ia is Name Metrici ADMIN E mail metrici metrici ro Actions list Setup Locations Admin Active Password Confirm password 2012 Metrici All rights reserved Version 1 8 Before you can use the analysis applications you must define the locations and the cameras available in each location by acc
Download Pdf Manuals
Related Search