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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 the License Plate Recognition RR—Search In Archive detection toolplate recognition RR—Search in archive detector, do the following:

  1. Go to the Detection ToolsDetectors tab.
  2. Below the required camera, click Create… → Category: Vehicle →  License Plate Recognition RR—Search In Archiveplate recognition RR—Search in archive.

By default, the detection tool detector is enabled and set to recognize vehicle license plates in the archive.

If necessary, you can change the detection tool detector parameters. The list of parameters is given in the table:

ParameterValueDescription
Object features
Check in listsYes

The Check in 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 the Yes value (see 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
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 Serverserver
Second stream
Other
EnableYesThe detection tool detector is enabled by default. To disable the detection tooldetector, select the the No value
No
NameLicense Plate Recognition RR—Search In Archiveplate 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 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 Archiveplate 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 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 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 events. The value must be in the range [0, 100]
Basic settings
Algorithm for detecting vehicle directionBy LP coordinatesThe By LP coordinates 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 a processor for the detection tool detector operation (see Selecting Nvidia GPU when configuring detectors).

Note
titleAttention!

It may can take several minutes to launch the algorithm on Nvidia GPU. You can use caching to speed up future launches (see Optimizing the operation of License plate recognition RR and Vehicle 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 starting with Detector Pack 3 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

...

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

Configuration of the License Plate Recognition RR—Search In Archiveplate recognition RR—Search in archive is complete.   If necessary, you can create and configure the necessary sub-tools detectors on the basis of the License Plate Recognition RR—Search In Archiveplate recognition RR—Search in archive (see Standard detection sub-toolsdetectors).