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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 RR detection tool, do the following:
- Go to the Detection Tools tab.
- Below the required camera, click Create… → Category: Vehicle → License Plate Recognition RR.
By default, the detection tool is enabled and set to recognize vehicle license plates.
If necessary, you can change the detection tool 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 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 detection tool is enabled by default. To disable the detection tool, select the No value |
| No | ||
| Name | License Plate Recognition RR | Enter the detection tool name or leave the default name |
| Accuracy and performance | Medium accuracy and high performance | Select the accuracy and performance of vehicle recognition:
|
| High accuracy and medium performance | ||
| 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 RR | Name of the detection tool type (non-editable field) |
| Advanced settings | ||
| Event timeout | 0 | Specify the time in seconds after which an event must be generated after recognizing a license plate in the frame. If the value is 0, an event is generated after the track with a license plate is lost. The value must be in the range [1, 3600] |
| Frame size change | 1920 | 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:
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. |
| Minimum recognition quality, in % | 80 | Specify the minimum quality of license plates recognition as a percentage. The higher the minimum recognition quality, the fewer false events. The value must be in the range [0, 100] |
| 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 |
| Speed detection | Off | Select from the list the mode for determining the speed unit of vehicles. Attention! Margin of error in determining the speed of vehicles is about 5% with a good calibration, as this function gives only a general idea of the situation. The consumption of resources doesn't change when the Speed detection parameter is enabled. Note For the correct displaying of the speed measurement unit, you must create the MEASUREMENT_UNIT system variable (see Appendix 9. Creating system variable) and specify the value:
|
| Kmph | ||
| Mph | ||
| Speed detection area height | 0 | Attention! Before you specify the value of the Speed detection area height parameter, you must select the area in the preview window (see Recommendations for configuring the speed detection area). Specify the speed detection area height in meters. The value must be in the range [0, 500] |
| Speed detection area width | 0 | Attention! Before you specify the value of the Speed detection area width parameter, you must select the area in the preview window (see Recommendations for configuring the speed detection area). Specify the speed detection area width in meters. The value must be in the range [0, 500] |
| Basic settings | ||
| Algorithm for detecting vehicle direction | By LP coordinates | The 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 | ||
| Info on unrecognized LPs | Yes | The parameter is disabled by default. If it is necessary to determine all possible information from unrecognized license plates, select the Yes value |
| No | ||
| Mode | CPU | Select a processor for the detection tool operation (see Selecting Nvidia GPU when configuring detectors). Attention! It may 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 | ||
| Vehicle recognition | Yes | The parameter is disabled by default. If you want to search for vehicles in the archive by vehicle make, model, vehicle class, or other specified criteria, select the Yes value (see Search by LPs) |
| No | ||
| Country selection | ||
| Country 1 name | Armenia, Argentina, Austria, Azerbaijan, Bulgaria, Brunei, Belarus, Brazil, Belgium, Chili (starting with Detector Pack 3.13), 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, Sri Lanka (starting with Detector Pack 3.13), 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 
.
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 delete the selected area, click the
button.
To save the parameters of the detection tool, click the Apply 
button. To cancel the changes, click the Cancel 
button.
Configuration of the License Plate Recognition RR is complete. If necessary, you can create and configure the necessary sub-tools on the basis of the License Plate Recognition RR (see Standard sub-detectors).
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