How to Capture License Plates with CCTV Cameras

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    Mike Haldas

    License plate capture is very difficult or impossible if you do not have the proper license plate recognition camera. You will need an LPR (License Plate Recognition) camera that will allow you to capture a car moving 10 – 100+ MPH. LPR cameras have adjustable shutter speeds that allow the camera to capture fast moving vehicles. LPR cameras also help compensate for the glare you get from the Headlights, taillights, sun, and the reflective properties on the license plate itself.

    You will also want a DVR that supports D1 (704 x 480) resolution. At the least CIF resolution (352 x 240). You will also want to make sure you have a real time recorder. Real time is considered at least 30 frames per second per camera. If you have a 4 channel DVR you will want to make sure it is 120 frames per second. 120/4=30. You will also want a DVR with a solid user interface that allows for advance searching this way it makes life easy when trying to retrieve video. This is why we highly recommend GeoVision and NUUO for LPR applications.

    Please see the below images showing the difference between a normal CCTV Camera (non LPR) and a LPR CCTV camera. NOTE: The cars in the images below were traveling roughly 20-25MPH.

    Notice the image from the camera without the LPR technology is blurred and the plate is whited out from the glare of the sun.

    License Plat Capture Camera - Bad Image

    Next, look below at the image captured by a surveillance camera with license plate recognition technology. The license plate is clearly readable.

    License Plate Capture Camera - Clear Image

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