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Documentation for Axxon One 2.0. Documentation for other versions of Axxon One is available too.
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To configure the License plate recognition BRS detector, do the following:
Submit to the technical support the MAC address of the server on which you will use the detector.
Attention!
The detector won't operate on the server with a different MAC address.
- Copy the license received from technical support into the C:\Program Files\Common Files\AxxonSoft\DetectorPack\BioirisSDK\License.txt file.
Restart the server (see Stopping the server, Starting the server).
To create the License plate recognition BRS detector, do the following:
- Go to the Detectors tab.
- Below the required camera, click Create… → Category: Vehicle → License plate recognition BRS.
By default, the detector is enabled and set to recognize vehicle license plates.
If necessary, you can change the detector parameters. The list of parameters is given in the table:
| Parameter | Value | Description |
|---|---|---|
| Object features | ||
| Check in lists | Yes | The 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 tracking | Yes | The metadata of the video stream is recorded to the database by default. To disable the parameter, select the No value |
| No | ||
| Video stream | Main stream | If 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 | ||
| Enable | Yes | The detector is enabled by default. To disable the detector, select the No value |
| No | ||
| Name | License plate recognition BRS | Enter the detector name or leave the default name |
| Decoder mode | Auto | Select 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 | ||
| Type | License plate recognition BRS | Name of the detector type (non-editable field) |
| Advanced settings | ||
| Frame size change | 1920 | The analyzed frames are scaled down to a specified resolution (1920 pixels on the longer side) by default. The following algorithm is used:
Note 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 % | 80 | Specify 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 timeout | 3 | Specify 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 timeout | 3 | Specify the time in seconds after which the vehicle track is considered lost. The value must be in the range [0, 3600]. Note 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 width | 10 | 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]. Attention!
|
| Minimum LP width | 1 | |
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 
.
Note
- For convenience of configuration, you can "freeze" the frame. Click the
button. To cancel the action, click this button again. The detection area is displayed by default. To hide it, click the
button. To cancel the action, click this button again.
To save the parameters of the detector, click the Apply 
button. To cancel the changes, click the Cancel 
button.
Configuration of the License plate recognition BRS is complete. If necessary, you can create and configure the necessary sub-detectors on the basis of the License plate recognition BRS (see Standard sub-detectors).
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