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License Plate Recognition Setup

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Dahua’s License Plate Recognition cameras automatically capture vehicle license plate images, and recognize license plate numbers and letters

During playback, an operator can perform a license plate search by time and date to view thumbnail images of all plates captured during the specified time period, or they can enter a license plate number to search for vehicles recorded with that plate.

License Plate Recognition

 

Installation

This section covers recommendations for physical installation of the device – including pole distance, height, and angle.

The can be installed in the center or side of lanes, with different recommended distances for mounting.

Mounting height and the best distance to capture:

Installation Method Height Lane Width Snapshot Distance (min, max) Best distance to capture
ITC237-PW6M 3m 3.5m 7-14m 9-12m
4m 3.5m-7m 8-16m 14-16m
5m 3.5m-7m 9-18m 14-18m
6m 3.5-7m 10-30m 25m

Center

If the is installed in the center of the lane, the relationship between the installation height h and the capture distance x is X≥1.7*H.

For example, in the case of 6m height in the standard scheme, the minimum capture distance is 10.2m.

Itc 237 center installation.png

  • The is installed in the center of the scene
  • The pole is 6 meters high
  • The figure below shows a 2 lane installation

Itc237 2 lane center.png

Side

If the is installed in the side of the lane, the relationship between the installation height h and the capture distance x is X≥1.7*H.

Itc 237 center installation.png

Itc237 installation diagram 1.png

  • The is installed on the right side of the scene
  • The pole is 6 meters high
  • The figure below shows a 2 lane installation

Itc237 2 lane right side.png

Limitation

Tips & Suggestions

  • 120×50 pixels needs from example photo
  • 5 degree angle or less
  • Green Line =
  • Red Box =
  • Yellow Box =
  • Gain = License Plate Reflection

NVR Compatibility

DHI-ITC237-PW6M-IRLZF1050 and DHI-ITC215-PW6M-IRLZF-B integrate with all Dahua NVR models except the following:

  • N41B1P, N41B2P
  • N41C1P, N41C2P
  • N42B1P, N42B2P, N42B3P

Videos from the Lab

License Plate Table
Characters State Example Snapshot Example LP Snapshot Pixel Density Possible Issues
2PDP714 California Example Plate Capture1.jpg Example Plate Capture2.jpeg 208×96 None
3HLM253 California Example Plate Capture3.jpg Example Plate Capture4.jpeg 208×80 None
8SJB Missouri Example Plate Capture5.jpg Example Plate Capture6.jpeg 160×96 *Special Character in License Plate
147F Illinois N/A License Plate Not Recognized by N/A License Plate Not Recognized by N/A 160×96

  • Special Character in License Plate
  • License Plate is extremely dirty

EOL License Plate Capture

Potential Issues

  • Chinese characters are showing on AI search in the recorder for LPC. The fix is to disable ANPR under AI > Parameters > ANPR > Uncheck enable box under the selected channel.

Chinese Characters In LPC Search Result.png Disable ANPR.png

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