Introduction

The License plate recognition model is designed to provide access through the gate/barrier when the license plate number of a vehicle is recognized.

Camera location

The camera must be located in the same room as the relay it will control, otherwise the relay will not work on recognition/detection.

Analytics settings

In the camera edit, switch to the Video analytics section.

Click Edit on the License plates recognition model.

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Select the desired camera from the list.

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Basic settings

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Number size in frame — ratio of frame height to number. It can be set by specifying a value from 0 to 1 manually in the field or by interactively selecting the size on the image;
Sensitive — level at which recognition occurs. The number is from 0.1 to 1. The lower the number, the higher the sensitivity;
Allowable number of erroneous characters — number of characters that are not considered when determining the authenticity of a license plate number during recognition. A number from 0 to 9.

When the sensitivity of the license plate recognition model is high, it may be triggered by noise and distortions not related to the license plate.

The sensitivity is adjusted experimentally to ensure guaranteed detection of the license plate in the frame while minimizing false alarms due to noise.

An example of an ultra-high sensitivity of 0.01.

Example: parameter Allowable number of erroneous characters = 3 is configured.

Employee Ivanov has a car with license plate E130AR184 and has access to recognize cars for parking enabled. When an unknown car with license plate number K510EA154 approaches, access will be granted and the person who passed will be recorded as Ivanov.

Compare license plates:

Е130АР184

К510ЕА154

Each license plate has 9 characters.

The parameter Allowable number of erroneous characters is set to 3, which results in 5 characters from the license plate K510EA154 matching the license plate of employee Ivanov's car (E130AR184): 1, 0, E, F, A, 1, 4. Since 6 of the 9 characters matched, access was granted. To correct the situation, the value of this parameter should be reduced.

Detection zone

Detection zones — the areas in which recognition occurs.

By default, once the detection zone is created, it is formed as a rectangle placed in the center.

Left mouse click with holding on the blue area of the zone — move the whole zone;
Left mouse click with holding on the white dot — move the edge of the zone;
Left mouse click on the edge of the selected zone — create an additional zone point.

Actions

Move the switch to the active position, click the Add action button.

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Then select the action type — Relay, the required relay from the list and the relay status — Open/Closed/Pass.