ANPR is a detection tool that reads license / number plates of vehicles in FoV.
Note | ||
---|---|---|
| ||
Axxon Next C-Werk ANPR / LPS is not compatible with Auto Intellect. Uninstall the Axxon Next C-Werk VMS and Auto Intellect, then reinstall Axxon Next C-Werk. |
To configure ANPR, do as follows:
- Select the VIT license License plate recognition object (1).
If you require using this detection tool for real-time number plate recognition (see Configuring online Vehicle License Plate recognition), set the corresponding parameter to Yes (2).
- If you need to enable recording of metadata, select Yes from the Record Objects tracking list (3).
- If a camera supports multistreaming, select the stream for which detection is needed. Selecting a low-quality video stream allows reducing the load on the Server (4).
If necessary, enable advanced image analysis (1).
Yes – improves the quality of recognition under adverse conditions (for example, if the characteristics / settings of the camera do not fully meet the requirements, or in bad weather). The processing time of the frame increases by 20-30%, depending on its size. Under normal conditions, this setting does not affect the quality of recognition
- To recognize the numbers at sharp angles with respect to the camera, select Yes in the Algorithm of recognition of distorted PL image field (2).
Set the image contrast threshold (3). The default value is 40 . On a high-quality image, increase this value to 50-60. If the image has poor contrast, lower this value.
In the appropriate fields, select one or more countries for ANPR (4).
Note title Important The more countries you select, the slower the recognition and the greater the likelihood of the recognition error.
- By default, the frame is compressed to
Analyzed framed are scaled down to a specified resolution (1, 1920 pixels on the longer side
. To avoid detection errors on streams with a higher resolution, it is recommended that compression be reduced (1).). This is how it works:
If the longer side of the source image exceeds the value specified in the Frame size change field, it is divided by two.
If the resulting resolution falls below the specified value, it is used further.
If the resulting resolution still exceeds the specified limit, it is divided by two, etc.
Info title Note For example, the source image resolution is 2048 * 1536, and the limit is set to 1000.
In this case, the source resolution will be divided two times (down to 512 * 384): after the first division, the number of pixels on the longer side exceeds the limit (1024 > 1000).
Select the current license type (2).
License
Description
Search in archive Basic ANPR Search License. Attention! This type of license provides a 30-sec delay between the number recognition and the corresponding event. (see Vehicle number plate recognition and search). 25 FPS or 6 FPS The 25 FPS license has a priority. The 6 FPS license is used only if you have no 25 FPS license. You cannot use the number plate recognition function if you have no FPS licenses purchased. 25 FPS The "Fast" license allows you to process video feeds up to 25 fps with a maximum vehicle speed of 150 km/h. You have to obtain an appropriate license to make ANPR work. 6 FPS The "Slow" license allows you to process video feeds up to 6 fps with a maximum vehicle speed of 20 km/h. You have to obtain an appropriate license to make ANPR work. - Set the maximum and minimum width of the vehicle number plate as a percentage of the FoV height (23, 45).
Specify the maximum number of recognition threads (34). If the value is 0, the recognition process will occur in the same thread that starts it.
Note title Important It is not recommended to specify a value that exceeds the number of CPU cores.
Specify the minimum percentage of similarity between the recognition result and the corresponding number plate template, for positive LPR result (56). Use this parameter to filter the results by reliability.
Set the number of frames required for LPR / ANPR (67). This is though a necessary condition, but not sufficient for the first output. This condition delays LPR output. This parameter allows to increase the reliability of the results, as well as to hide false positives.
In the Tracker timeout field, enter a time period in seconds. This is the time before detection starts again after a number plate is recognized (78).
You can configure an ANPR zone in FoV. The zone is resized by moving the anchor points.
Info title Note For your convenience, you can click the button and configure the mask on a still frame / snapshot. To undo, click this button again.
Info title Note Detection zone is displayed by default. You can click the button to hide the zone. To undo, click this button again.
- Click the Apply button.
...