- Jul 15, 2017
- 147
- 28
I'm more interested in ANPR. I tried many alternatives, such as CodeProject.AI and the Full ALPR Database System for Blue Iris, but I couldn't get them to work. I wasted days on them and still have no results.
How to use these AI features without Dahua NVR?
- Thread starter sunny0101786
- Start date
There are a few ways to do plate reading, but it all starts with a camera setup with the proper optical zoom (ideally field of view is not much bigger than the size of a car) and fast enough shutter speed along with a desirable angle.
Based on your other posts, it was pointed out to you that you didn't have enough optical zoom, along with the camera not setup to read plates, and an angle that isn't the best, but probably still doable for many plates. That has been why you are unsuccessful.
Also do you have an SD card in that camera? That is where the ANPR data is saved, so without an SD card or AnPR capable NVR, you won't get results even if setup correctly. BI cannot pull ANPR data from the camera.
As far as reading plates, there are a few ways this is accomplished:
Keep in mind that this is a camera dedicated to plates and not an overview camera also. It is as much an art as it is a science. You will need two cameras. For LPR we need to OPTICALLY zoom in tight to make the plate as large as possible. For most of us, all you see is the not much more than a vehicle in the entire frame. Now maybe in the right location during the day it might be able to see some other things, but not at night.
At night, we have to run a very fast shutter speed (1/2,000) and in B/W with IR and the image will be black. All you will see are head/tail lights and the plate. Some people can get away with color if they have enough street lights, but most of us cannot. Here is a representative sample of plates I get at night of vehicles traveling about 45MPH at 175 feet from my 2MP 5241-Z12E camera (that is all that is needed for plates):
See the LPR subforum for more details.
Based on your other posts, it was pointed out to you that you didn't have enough optical zoom, along with the camera not setup to read plates, and an angle that isn't the best, but probably still doable for many plates. That has been why you are unsuccessful.
Also do you have an SD card in that camera? That is where the ANPR data is saved, so without an SD card or AnPR capable NVR, you won't get results even if setup correctly. BI cannot pull ANPR data from the camera.
As far as reading plates, there are a few ways this is accomplished:
- Camera is setup to visually read the plates, but no automation or logging of the actual plate is done. With this method, one could use a 3rd party reader like CodeProject and that database or OpenALPR as an example.
- Purchase a camera that has built-in ANPR capabilities.
Keep in mind that this is a camera dedicated to plates and not an overview camera also. It is as much an art as it is a science. You will need two cameras. For LPR we need to OPTICALLY zoom in tight to make the plate as large as possible. For most of us, all you see is the not much more than a vehicle in the entire frame. Now maybe in the right location during the day it might be able to see some other things, but not at night.
At night, we have to run a very fast shutter speed (1/2,000) and in B/W with IR and the image will be black. All you will see are head/tail lights and the plate. Some people can get away with color if they have enough street lights, but most of us cannot. Here is a representative sample of plates I get at night of vehicles traveling about 45MPH at 175 feet from my 2MP 5241-Z12E camera (that is all that is needed for plates):
See the LPR subforum for more details.
Last edited: