Go to documentation repository
Page History
| Note | ||
|---|---|---|
| ||
For the License Plate Recognition IV plate recognition IV to work, you must activate the license (see Activating the license for the License plate recognition IV in Windows OS, Activating the license for the License plate recognition IV in Linux OS). |
To configure the License Plate Recognition IV detection toolplate recognition IV detector, do the following:
- Go to the Detection Tools
- Detectors tab.
- Below the required camera, click Create… → Category: Vehicle → License Plate Recognition
- plate recognition IV.
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 Checking in lists of LPs) | |||||
| 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 Serverserver | |||||
| Second stream | |||||||
| Other | |||||||
| Enable | Yes | The detection tool detector is enabled by default. To disable the detection tooldetector, select the the No value | |||||
| No | |||||||
| Name | License Plate Recognition plate recognition IV | 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 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 | |||||||
| Period of ignoring repeated recognitions (sec) (starting with Detector Pack 3.14) | 0 | Specify the period in seconds during which re-recognized license plates are ignored. The value must be in the range [0, 86400] | |||||
| Type | License Plate Recognition plate recognition IV | 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:
| |||||
| 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:
| |||||
| Initiate event in (sec) | 1 | 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 [0, 3600]. If the value is 0, an event will be generated after the track with a license plate is lost | |||||
| Maximal number of characters in LP | 10 | Specify the maximum number of characters in the license plate. The value must be in the range [1, 20] | |||||
| Minimal number of characters in LP | 5 | Specify the minimum number of characters in the license plate. The value must be in the range [1, 20] | |||||
| 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] | |||||
| Track retention time (sec) | 3 | Specify the time in seconds after which the vehicle track is considered lost. The value must be in the range [0, 3600].
| |||||
| 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). | |||||
| By LP scale change | |||||||
| Direction of movement (starting with Detector Pack 3.14) | Both | By default, an event is created when a vehicle moves in Both directions. If you want the event to be created when a vehicle moves from the camera (Outgoing) or to the camera (Incoming), select the corresponding value | |||||
| Outgoing | |||||||
| Incoming | |||||||
| 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].
| |||||
| Minimum LP width | 1 | ||||||
| Processing unit | CPU | Select a processor for the detection tool detector operation (see Selecting Nvidia GPU when configuring detectors).
| |||||
| Nvidia GPU 0 | |||||||
| Nvidia GPU 1 | |||||||
| Nvidia GPU 2 | |||||||
| Nvidia GPU 3 | |||||||
| Country selection | |||||||
| Country name |
| Select from the list the country whose license plates you want to recognize and select the recognition accuracy:
| |||||
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 
.
| Info | ||
|---|---|---|
| ||
|
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 IV is complete. If necessary, you can create can create and configure the necessary detection sub-tools detectors on the basis of the License Plate Recognition plate recognition IV (see Standard sub-detectors).
Overview
Content Tools