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Tip

Hardware requirements for License plate recognition RR and Vehicle recognition RR

Camera requirements for the License plate recognition RR, Vehicle recognition RR and their sub-detectors

Optimizing the operation of License plate recognition RR and Vehicle recognition RR on GPU in Windows OS

Parameters that specify the conditions for starting a macro when recognizing a vehicle

Checking in lists of LPs

Examples of macros used when working with lists of license plates

To configure the License plate recognition RR—Search in archive detector

...

, do the following:

  1. Go

...

  1. to the Detectors tab.
  2. Below the required camera,

...

  1. click Create… → Category: Vehicle →

...

  1. License

...

  1. plate recognition RR—Search in archive.

By default, the

...

detector is enabled and set to recognize vehicle license plates in the archive.

If necessary, you can change the

...

detector parameters. The list of parameters is given in the table:

ParameterValueDescription
Object features
Check in listsYes
The 

The Check in

lists 

lists parameter is disabled by default. If you want to use this

detection tool

detector to check in lists of vehicle license plates, select the

 

Yes

 value

 value (see 

Configuring vehicle license plate recognition based on the created lists

Checking in lists of LPs)

No
Record objects trackingYesThe metadata of the video stream is recorded to the database by default. To disable the parameter, select the No
 value
 value
No
Video streamMain streamIf the camera supports multistreaming, select the stream for which detection is needed. Selecting a low-quality video stream reduces the load on the
Server
server
Second stream
Other
EnableYesThe
detection tool
detector is enabled by default. To disable the
detection tool
detector, select
the 
the No
 value
 value
No
NameLicense
Plate Recognition RR—Search In Archive
plate recognition RR—Search in archiveEnter the
detection tool
detector name or leave the default name
Decoder modeAutoSelect a processing resource for decoding video streams. When you select a GPU, a stand-alone graphics card takes priority (when decoding with
NVIDIA
Nvidia NVDEC chips). If there is no appropriate GPU, the decoding will use the Intel Quick Sync Video technology. Otherwise, CPU resources will be used for decoding
CPU
GPU
HuaweiNPU
TypeLicense
Plate Recognition RR—Search In Archive
plate recognition RR—Search in archiveName of the
detection tool
detector type (non-editable field)
Advanced settings
Frame size change1920

The analyzed frames are scaled down to a specified resolution (1920 pixels on the longer side) by default. The value must be in the range [640, 10000]. The following algorithm is used:

  • If the longer side of the source image exceeds the value specified in the Frame size change field, it is divided by two.
  • If the resulting resolution falls below the specified value, the algorithm stops, and this resolution will be used further.
  • If the resulting resolution still exceeds the specified value, it is divided by two until it is less than the specified resolution.
Info
titleNote

For example, the source image resolution is 2048*1536, and the specified value is set to 1000.

 

In this case, the source resolution will be halved two times (512*384), as after the first division, the number of pixels on the longer side exceeds the specified value (1024 > 1000).

 

If detection is performed on a higher resolution stream and detection errors occur, we recommend reducing the compression.

GDPR policy-

By default, on the layout and in the archive, the characters of a license plate are completely hidden "GDPR ON". To display the characters of a license plate, you must enter a value:

"-"—hide all characters (default value),

" (blank field of a parameter value)"—show all characters,

"N-"—hide the first N characters,

"-N"—hide the last N characters,

where N is the number of characters

Minimum recognition quality, in %80Specify the minimum quality of license
plates
plate recognition as a percentage. The higher the minimum recognition quality, the fewer false
alarms
events. The value must be in the range [0, 100]
Basic settings
Algorithm for detecting vehicle directionBy LP coordinatesThe By LP coordinates
algorithm
algorithm is used by default. It works as follows: if the coordinates of the vehicle license plate shift from top to bottom (the vehicle moves towards the camera) and if the coordinates of the vehicle license plate shift from bottom to top (the vehicle moves away from the camera). Select the By LP scale change parameter if in the Surveillance window, the scale of the vehicle license plate increases (the vehicle moves towards the camera) and if the scale of the vehicle license plate decreases (the vehicle moves away from the camera)
By LP scale change
ModeCPU

Select

the

a processor for the

detection tool operation—CPU or NVIDIA GPU (see General information on configuring detection

detector operation (see Selecting Nvidia GPU when configuring detectors).

Note
titleAttention!

It

may

can take several minutes to launch the algorithm on

NVIDIA

Nvidia GPU. You can use caching to speed up future launches (see Optimizing the operation of License

Plate Recognition

plate recognition RR and Vehicle

Recognition

recognition RR on GPU in Windows OS)


Nvidia GPU 0
Nvidia GPU 1
Nvidia GPU 2
Nvidia GPU 3
Country selection
Country 1 name

Armenia, Argentina, Austria, Azerbaijan, Bulgaria, Brunei, Belarus, Brazil, Belgium, China, Cyprus, Ivory Coast, Czech Republic, Germany, Colombia, Denmark, Estonia, Egypt, Finland, France, Georgia, Greece, Croatia, Hungary, Indonesia, Ireland, Italy, Kyrgyzstan, Kazakhstan, Lithuania, Luxembourg, Latvia, Malta, Malaysia, Mexico, Moldova, Myanmar, Netherlands, Peru, Poland, Portugal, Romania, Serbia, Russia, Sweden, Slovakia, Slovenia, Tunisia (starting with Detector Pack 3.13), Turkmenistan, Tajikistan, Spain, Ukraine, USA (starting with Detector Pack 3. 12), Uzbekistan, Vietnam, Not used

In the corresponding fields, select from the list one or more countries whose license plates you want to recognize
Country 2 name
Country 3 name
Country 4 name
Country 5 name

In the window, specify the area in which license plate detection and recognition will be performed. You can adjust the area by moving the anchor points points Image Modified. 

Image Modified

Info
titleNote
  • For convenience of configuration, you can "freeze" the frame. Click
the 
  • the Image Modified
 button
  •  button. To cancel the action, click this button again.
  • The detection area is displayed by default. To hide it, click
the 
  • the Image Modified
 button
  •  button. To cancel the action, click this button again.
  • To delete the selected area, click
the 
  • the Image Modified
 button
  •  button.

To save the parameters of the detection tooldetector, click the Apply Image Modified button. To cancel the changes, click the Cancel Image Modified button.

Configuration of the License plate recognition RR—Search in archive is complete. If necessary, you can create and configure the necessary sub-detectors on the basis of the License plate recognition RR—Search in archive (see Standard sub-detectors).