Blue iris not picking up license plates at night. Trigger issue

[Mikeee]

I currently have a camera setup for LPR. I messed with and have it working great during the day. I have the settings an focus great at night also. But heres my issue.
When a car drives past at night all you see is the plate, It is not triggering in blue iris almost like its not seeing the motion. Can someone post a few photos of their trigger settings? I can see the cars in the timeline. But it does not alert. Any ideas other cameras work fine. Its almost like it because the camera is dark.

 

[Flintstone61]

sometimes you have to play around with using different settings for triggers. Mine is doing that at night now because I have screwed around with all the IVS and AI and object tracking and BI motion settings.
When I turn off AI and just use Motion zones A>B,B>A,B>C, i get my cars at night but no AI plate #. but I can clearly see the Plates. motion gets triggered 99% better. Right now I have Moths screwing up the detection in Pic 2.

 

[iwanttosee]

These setting is what works for me.
I tried ONVIF, I tired Object Detection

I only use Zones now. Zone A triggers, AI to read Zone B (entire screen) for license plate.

You will have to try and test what works for you!

 

[iwanttosee]

This is how I fine tune day/night/pre-trigger image/post-trigger image/analyze one image each(?ms)/zone/etc.
Go to BI on your server, get to alerts, HOLD control on your keyboard while double click on the alert clip, let go of the control key after you click, and it will bring out the AI analyzer window.


View attachment Recording 2026-07-14 041843.mp4