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The SGSE forensic LPR for smart cities

The context

The rapid development of artificial intelligence in the electronic security market has facilitated access to a greater volume of information on the scene thanks to the classification of objects of interest (mainly vehicles and people).

The technological evolution of license plate recognition cameras has also allowed greater precision in the capture of license plates at speed, which until recently, was unimaginable at a reasonable cost.

This has provided access to a new era in smart cities, thanks to these devices that allowed operators with much more information to gain in depth knowledge of the real-time behaviour of their municipality, as well as the possibility of solving complex situations through recorded video.

The SGSE Forensic LPR at Milestone

SGSE has developed an integration in Milestone to carry out forensic analysis on the recorded video with the information from the artificial intelligence of each certified license plate recognition camera in this integration.

With the Forensic LPR, in any of the software editions of Milestone, we can:

  • Search the recorded video by full or partial license plate.
  • Search the recorded video by LPR camera characteristics integrated into the Forensic LPR.
  • Create blacklists and whitelists.
  • Create PDF reports.
  • Create CSV reports.

The available characteristics are based on each camera, the most common being:

  • License plate.
  • Type of vehicle.
  • Colour of vehicle.
  • Type of registration.
  • Vehicle make.
  • Country of registration.

When the operator needs to open an investigation into an event, they can find all the search tools in the Search tab of Milestone Smart Client shown in the image below to work more efficiently in a single place.

Within the Search tab, the operator can search by:

  • Movement.
  • Alarms.
  • Events.
  • Markers.
  • Metadata.

To start a search, we must select a time window within the different predefined options that appear in the drop-down menu shown in the following image:

Or customize the search through the calendar:

Subsequently, we select the camera or group of cameras on which we want to perform the search:

Once the search on the camera or the set of cameras has been executed, we have the total number of results (in our example below, a total of 842) distributed in the time window that we have defined over which the operator can move easily.

By clicking on any of the video thumbnails obtained from the search, a blue square will appear, indicating that we have opened an investigation on this thumbnail through its recorded video sequence in the right margin of Smart Client.

In our case, we see it in the video segment recorded from camera KM47 for the moments before and after the search timeline to access all the details.

This way we access all the details, as well as having the location of the camera.

We can finish the investigation by exporting the recorded video sequence as shown in the image below:

Filters for intelligent searches on video recorded with the Forensic LPR

Thanks to the Forensic LPR developed by SGSE we can find a significant number of additional filters for intelligent searches.

This allows us to provide the operator with a powerful forensic tool to solve incidents in our municipalities.

Within the Search tab, previously explained, we will have different options to run the search in the recorded video, among which is the LPR Search module which gives access to the filters of the different characteristics provided by this LPR camera model.

Once we click on Search LPR, we see the different search filters such as the License Plate Type shown below:

We can filter according to the type of license plate and have the option of searching for those vehicles that do not have license plates within the LPR camera’s field of view as well as vehicles that transport dangerous goods.

The following set of images details these different types of vehicles, which can be filtered based on their license plate type.

We can continue in the filter options with the Vehicle Make within the LPR camera’s field of view, as detailed below.

A total of 86 vehicle makes are available, shown in the table below.

Hyundai SsangYong Alfa Romeo
Toyota Citroen Great Wall
KIA Fiat Infiniti
Volkswagen Scania Smart
Benz MAN Maxus
Nissan Volvo JAC
Ford Lexus Jaguar
Isuzu Seat GMC
BMW Land Rover Lincoln
Chevrolet Daihatsu JMC
Mitsubishi Dongwo SAAB
Renault Subaru FAW
Opel Iveco Yutong
Suzuki MINI Guangzhou Yunbao
Skoda JEEP Joylong
Daewoo Porsche Geely
Audi Chery Cadillac
Mazda Dodge JBC
GAC HINO Chrysler An´Kai
Peugeot Acura Haima
Foton King Long Dongfeng
Geely-Emgrand Perodua UD
BYD Renault Samsung Proton
HICOM Hyundai-Rohens SsangYong-Old Version
Equus-Old Version CNHTC Rolls-Royce
Beiben Truck Haval Hino
Kia-Borrego Chang´an Alfa

Apart from the make of the vehicle, we can also carry out a search by its Colour, a total of 11 colours being available in an additional filter.


This set of filters can also work in combination with the Vehicle Type for forensic analysis of the recorded video.

Small truck 

Thus, the development of SGSE allows us to carry out a precise forensic analysis of the recorded video of our facility in order to resolve incidents quickly and effectively.

Searches for partial license plates in the Forensic LPR

To facilitate the operator’s tasks and be able to solve complicated situations in which we do not have all the information, the Forensic LPR allows searches with partial information of the desired license plates based on a set of incomplete alphanumeric information.

For example, it will be enough to enter a set of digits in the searches so that the Forensic LPR shows us all the different license plates captured with their associated video that contains said digits.

Whitelists and/or blacklists in the Forensic LPR

Along with the previous display related to the forensic tools in the recorded video, there is also the option of raising events in the Forensic LPR, thanks to the creation of white and/or blacklists.

Once the white and/or blacklists have been created as shown in the image below, we can incorporate the license plates of those vehicles that we want to trigger an event when they are captured by certified LPR cameras in the Forensic LPR.

The list of license plates can be easily included by importing a file with the set of information.

These events allow us to trigger actions within Milestone through the rule engine.

So, for example, we can activate the raising of an exit barrier when a license plate belonging to a list of authorised vehicles (whitelist) is read.

Likewise, we can trigger, for example, the sending of an email or the activation of a red light at an exit when a license plate from a list of unauthorised vehicles is read (blacklist).



Likewise, we can escalate the events to the alarm category to be managed by the operator.

PDF reports from the Forensic LPR

Thanks to the Forensic LPR, it is possible to obtain detailed PDF reports with all the information linked to a specific vehicle through its license plate, as illustrated by the following image:

CSV reports from the Forensic LPR

All vehicle information (license plate, characteristics, LPR camera that has captured the information and the date and time) can be obtained in CSV format through the Forensic LPR to be processed in subsequent analysis.

LPR cameras certified in the Forensic LPR

The models listed in the table below are currently certified in the Forensic LPR developed by SGSE.








Urban and interurban


1/1.8″ CMOS

2/3″ GMOS


1/1.8″ CMOS

1/2.8″ CMOS

Focal lenght

Motorized 8-32mm

Motorized 15-50mm

Motorized 11-40mm

Motorized 2.8-12mm

Motorized 4.7-47mm







Vehicle attributes that can be detected

– License plate
– Type of vehicle
– Colour (During the day)
– Brand
– Country of registration

– License plate
– Type of vehicle
– Colour (During the day)
– Brand

– License plate
– Type of vehicle
– Colour (During the day)
– Brand
– Type of vehicle
– Country of registration
– Type of vehicle
– Colour (During the day)

H.265 / H.264 / MPEG

IR range

100 m

30 m

50 m

100 m

50 m







Operating system



IP66 / IK10



IP67 / IK10

IP67 / IK10

StoragemicroSD/TF card 128Gb

 microSD/TF card 128Gb

 microSD/TF card 128Gb

 microSD/TF card 256Gb

 microSD/TF card 256Gb

Power supply12VDC, 24VDC, PoE

24VDC, 100 a 240 VAC

24VDC, 100 a 240 VAC

12VDC, PoE

12VDC, 24VDC, PoE

Embedded LPRYes
Detection rate = 98%
Reading rate = 95%
Detection rate = 98%
Reading rate = 98%
Detection rate = 98%
Reading rate = 98%
Detection rate = 98%
Reading ratea = 98%

Detection rate = 98%
Reading rate = 95%

Max. pickup speed

160 Km/h

250 Km/h

250 Km/h

100 Km/h

90 Km/h

Design your electronic security solutions for Smart Cities with SGSE

Calle Anabel Segura, 7 Esc.A 1ºB
28108 Alcobendas (Madrid) – España
+34 91 056 43 96 – info@sgse.eu


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