To configure the License plate recognition BRS detection tool detector, do the following:
Submit to the technical support the MAC address of the
server on which you will use the
detector.
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
Stop the server, Starting
the server).
To create the License plate recognition BRS detection tool detector, do the following:
- Go to the
Detection Tools- Detectors tab.
- Below the required camera, click Create… → Category: Vehicle → License plate recognition BRS.
By default, the detection tool detector is enabled and set to recognize vehicle license plates.
If necessary, you can change the detection tool 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 |
detection tool | detector to check in lists of vehicle license plates, select |
the | 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 |
detection tool | detector is enabled by default. To disable the |
detection tool the | the No value |
| No |
| Name | License plate recognition BRS | Enter the |
detection tool | 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 | 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 |
detection tool | 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: - If the longer side of the source image exceeds the value specified in the Frame size change
|
field- parameter, 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 |
|---|
| 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 plates | of license 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] |
| Event timeout | 3 | Specify the time in seconds after which |
the alarm | 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, |
the alarm | 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]. | Info |
|---|
| You can use this parameter to avoid double |
|
triggerings 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 |
|
detection tool detector again. If you specify the timeout longer than the time of possible overlapping of the license plate in the frame, the |
|
detection tool will trigger 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]. | Note |
|---|
| - 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 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 
Image Removedpoints 
Image Added.
Image Removed
Image Added
To save the parameters of the detection tooldetector, click the Apply 
Image Removed 
Image Added button. To cancel the changes, click the Cancel 
Image Removed 
Image Added 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).
