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ParameterValueDescription
Object features
Check in listsYesThe parameter is disabled by default. If you want to use this detector to check in lists of vehicle license plates, select the Yes value (see Configuring vehicle license plate recognition based on the created lists)
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 Server
Second stream
Other
EnableYesThe detector is enabled by default. To disable the detector, select the No value
No
NameLicense plate recognition BRSEnter the 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 BRSName of the 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 following algorithm is used:

    1. If the longer side of the source image exceeds the value specified in the Frame size change parameter, it is divided by two.
    2. If the resulting resolution falls below the specified value, the algorithm stops, and this resolution will be used further.
    3. 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 plate recognition as a percentage. The higher the minimum recognition quality, the fewer false events. The value must be in the range [0, 100]
Event timeout3Specify the time in seconds after which an event must be generated after recognizing a license plate in the frame. The value must be in the range [1, 3600]. If the value is 0, an event will be generated after the track with a license plate is lost
Tracker timeout3

Specify the time in seconds after which the vehicle track is considered lost. The value must be in the range [0, 3600].

Info
titleNote

You can use this parameter to avoid double events that can occur, for example, when a license plate is recognized when it appears in the frame, then it is overlapped by a visual obstacle and then recognized by the detector again.

If you specify the timeout longer than the time of possible overlapping of the license plate in the frame, the detector will generate an event only once.

Basic settings
Maximum LP width10

Specify the maximum and minimum width of the license plate as a percentage according to the actual size of the license plate in the frame. The value must be in the range [0, 100].

Note
titleAttention!
  • Specified values must exclude omissions in license plate recognition, that is, the values must not be smaller than the real size of the license plate in the frame. Otherwise, the license plates won't be recognized.
  • The Minimum LP width parameter affects the CPU load: the higher the value, the lower the load.
  • Reducing the difference between the maximum and minimum width reduces the CPU load.
Minimum LP width1

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