Dahua License Plate Initial Setup


  • 150×50 License Plate pixel size or higher from snapshot images
  • Car Traffic = 25MPH or Less

ITC237-PU1B-IR Initial Setup4.png

ITC Setup Example1.png

Camera Angle

Pixel Density

Video Instructions

Video Overview-Drone Flyover

Step by Step Instructions

1. Log into the Web UI of the camera by typing the IP into a web browser.

Enter the username/password and click Login

ITC237 Physical Setup 0.jpg

2. Click Config (LPR) to enter the configuration menu for the LPR function

ITC237 Physical Setup 0-1.jpg

3. The LPR Config menu will be displayed

ITC237 Physical Setup 0-2.jpg

To configure the LPR function use the interface:

  • Iden area.jpg – Region – Set region for detection, region is within the red line.
  • Snap line.jpg – Detect Line – Detect line for trigger of snapshot, detect line is green.
  • Shield area.jpg – Shield Area – Set shield area to not identify vehicle plates, Up to 2 shield areas, Shield area is within the grey box.
  • Redraw.jpg – Redraw – Click to delete current config

4. Adjust the plate snapshot position to be in the yellow box.

ITC237 Physical Setup 1 - Correct.jpg

5. Continue to make adjustments with the detection zone AND physically moving the camera until the yellow box is right on point with the expected license plate position.

Physically adjust the camera to complete proper setup.

Ensure the box matches the actual plate position and size in the video.

ITC237 Physical Setup 1 - Incorrect.jpg

Step by Step Instructions – Guide

The Guide interface is useful to configure the correct settings for license plate capture

Log into the Web UI of the camera by typing the IP into a web browser.

Enter the username/password and click Login

ITC237 Physical Setup 0.jpg

  • Click the Guide tab.

LPR Camera Guide Button.jpg

On the Guide interface, you can configure capture scenarios. You can click at at the upper-right corner of Guide interface to exit at anytime.

LPR Camera Guide Exit.jpg

1. Confirmation

  • Confirm the Software Version is the latest (Visit the Product page for latest firmware version – Link), and then click OK.

LPR Camera Guide Setup -1.jpg

2. Plate Pixel

  • You can check whether the video image is properly zoomed and focused by checking the plate pixel.

Below the video frame there is an example of the optimal plate positioning:

LPR Camera Plate Pixel Reference.jpg

Use the Pixel Plate settings to adjust the camera for zoom and focus

LPR Camera Plate Pixel settings.jpg

  • Drag the Zoom and Focus bar to adjust the image properly
  • Position a vehicle/plate into the camera’s view

Click Snapshot to take a snapshot of the plate (Snapshot button will become Resume)

  • Drag the yellow box to the position of the plate

LPR Camera Guide Setup -2.jpg

  • Click Local Range to zoom the picture by 2x or 4x zoom rate (if required)
  • Continue to adjust the position yellow box to make it optimal plate size:

LPR Camera Guide Setup -3.jpg

If the plate within the yellow box is larger than the optimal plate size in the example, zoom out the video image; if smaller, zoom in the video image.

It may also require reviewing proper mounting requirements/positions if any softw3are adjustments do not allow for optimal plate positioning.

  • Once the plate is in optimal position, click Check Pixel. Click Yes to confirm.

LPR Camera Plate Pixel Check.jpg

3. Recognition

  • This section will configure the recognition/identification area for detection of license plates. The sample image can be used as a reference

LPR Camera Recognition Reference.jpg

A sample Identification Area and Snap Line will be displayed.

To clear or Redraw these Click either Iden Area Iden area.jpg or Snap Line Snap line.jpg

Then click Redraw – Redraw.jpg

To create new Recognition settings:

  • Click Iden Area. Iden area.jpg

Click and draw 4 lines on the video frame to create a recognition area. Only plates in this area will be detected.

  • Click Snap LineSnap line.jpg

Draw snap line by dragging mouse on the area. The snap line must cross the area. Vehicles passing this line will trigger plate detection.

LPR Camera Recognition Setup.jpg

3) Click Save to complete the Setup.

Click Finish, exit Guide interface and enter Live interface.

Example at Live interface:

LPR example 1.png

LPR example 2.png

  • Make sure the vehicle is within the red identification area line
  • The green snap line is about 1/3 of the road
  • Angle between the bottom of the license plate and the screen ≤5°
  • The license plate has more than 140 pixels.


Working Examples

Snapshot Example of Interface Current Configuration of Camera LPR
ITC Setup Example4.png ITC Setup Example5.png ITC Setup Example6.png

Snapshot Examples and Suggestions

Description Example of Bad Capture Current Configuration of Camera LPR Suggested Changes
Camera is reading signs instead of license plates ITC237-PU1B-IR Initial Setup1.png ITC237-PU1B-IR Initial Setup2.png ITC237-PU1B-IR Initial Setup3.pngDecrease Detection Range
Insufficient License Plate Pixel Density ITC Setup Example14.png ITC Setup Example13.png Reposition Camera or increase Zoom
Camera reading other text from vehicle ITC Setup Example16.png ITC Setup Example18.png ITC Setup Example17.pngReposition Camera or increase zoom
Capture Angle Too Extreme ITC Setup Example20.jpg ITC Setup Example21.png Reposition Camera to Less Extreme Angle

Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.