Automatic Number Plate Recognition (ANPR)

Automatic Number Plate Recognition (ANPR) is used to detect and read vehicle number plates automatically. This guide walks through opening the ANPR application in App Stack, configuring devices and ROIs, and setting Meta Parameters for a typical deployment.

1. Finding the ANPR Application in App Stack

1. Open App Stack on the platform.
2. Use the search bar (usually at the top right of the dashboard).
3. Enter ANPR.
4. In the results, click once on the application to open it.

2. Device Configuration

After the application opens, you are taken to the Device Configuration page.

• On the right side of the page, use the option to add a device and connect the cameras you need.
• When finished, continue to the next step (ROI Configuration).

3. ROI (Region of Interest) Configuration

All devices you added during the device configuration step appear here so you can draw ROIs on the correct feeds.

1. Select the device you want to configure.
2. Click Add ROI (top right of the ROI Configuration page).

3. Fill in the ROI details:

Note: You can update or delete an ROI by selecting it and using the corresponding actions.

4. Meta Parameters Configuration

After ROI setup, open the Meta Parameters page.

4.1 Basic Configuration

A standard ANPR setup includes the following modules in the flow:

• Device
• Vehicle Classification
• Number Plate Recognition
• Region of Interest (ROI)
• Event
• Alert

These components are sufficient for standard ANPR operation.

4.2 Violation Detection (Optional)

If you need to configure the system for traffic violations, additional modules are available:

• No Seatbelt Detection
• No Helmet Detection
• Triple Riding Detection
• Driver on Call Detection

4.3 Device Module

Click on the Device node and select the required device.

Color Detection

Note: For most deployments, keep this value at the default setting 0.

ANPR Discard Rule

Model Update

4.4 Vehicle Classification Confidence

• The default confidence value is 0.45.
• Adjust if needed based on the camera's field of view.

4.5 Number Plate Confidence

• The default confidence value is 0.45.
• Adjust if needed based on the camera's field of view.

4.6 Final Configuration

1. Select the required device and associated ROI.
2. Configure parameters if needed.
3. Enter a name for this configuration.
4. Choose the hardware type (CPU or GPU) to match your server.

Country Selection

• Select the appropriate country based on the deployment region.
• The application supports multiple country formats for number plate recognition.

Scheduler Configuration

The Scheduler option is used to define operating modes based on time.

• Configure when the application should run in Day Mode.
• Configure when the application should run in Night Mode.

TensorRT Configuration

When everything is set, click Save.

Conclusion

The ANPR application enables automated vehicle number plate detection with configurable ROI types, optional violation detection modules, and hardware acceleration options.