New CodeProject.AI Object Detection (YOLO11 .NET) Module

Hoping someone running the YOLO11 .NET stack can spot what I'm missing. My plate detection works perfectly but the ALPR OCR read never gets called, so I never get plate numbers.


Setup:


  • CodeProject.AI Server 2.9.5
  • Object Detection (YOLO11 .NET) 1.4.0
  • License Plate Recognition (YOLO11 .NET) 1.1.1
  • Blue Iris (current)
  • GTX 1070, DirectML — both modules confirmed running on GPU
  • ALPR set to "This AI server" (NOT Plate Recognizer cloud)

What works:


  • Feeding a plate image directly into CodeProject.AI Explorer → License Plate Recognition reads it correctly (e.g. "BSV7099" at 96%). So the ALPR module itself works.
  • In Blue Iris, using custom model license-plate-v5, an ROI zone, detection is solid: CPAI logs show Object Detection (YOLO11 .NET) command 'custom' ['Found DayPlate'] reliably, fast (30-50ms), often 90%+ confidence.

The problem:


  • After "Found DayPlate," the alpr command never fires. There is no License Plate Recognition ... command 'alpr' line in the CPAI logs on live triggers — only the custom/DayPlate detection. So the plate location is found, but it's never sent to the ALPR reader for OCR. HA/webhook gets an empty plate every time.

Relevant BI AI settings:


  • "Confirm alerts with AI" ✓
  • Custom object models: license-plate-v5 ✓
  • "License plates" ✓
  • "To confirm": DayPlate,NightPlate,car,truck
  • Default object detection ✓

Screenshot (128).pngScreenshot (129).pngScreenshot (130).pngScreenshot (131).pngScreenshot (132).pngWith the YOLO11 .NET ObjectDetection + ALPR modules, what actually triggers the ALPR read after a DayPlate detection? What BI setting bridges "found the plate location" → "run ALPR OCR on it"? Detection is clearly working; the OCR call just never happens.


Thanks!
 
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Yeah, I haven't figured that out either. But i am on Yolo10....
But I did not dig deep. If I really need the plate for a LEO i can scroll back and get it for up to 3-4 weeks.
I see in my AI object inspector on the clips playback it will populate a plate # if it get's a semi-decent read on it.
I'd need a larger %age of the total cam image to help it get a higher %age of plates.
Been quiet over here this year.
The Drug heads associated with the Apartments haven't been parking on our side of the street.
Haven't seen as much of the 1 man Crack/meth parties much since we got the back yard light.
I may be too much of a fossil to work out the ALPR.
I'm looking at your settings and adopting a couple things
I can't remember how to bring in yolo11 from yolo10....
 
Last edited:
Flintstone61 said:
Yeah, I haven't figured that out either. But i am on Yolo10....
But I did not dig deep. If I really need the plate for a LEO i can scroll back and get it for up to 3-4 weeks.
I see in my AI object inspector on the clips playback it will populate a plate # if it get's a semi-decent read on it.
I'd need a larger %age of the total cam image to help it get a higher %age of plates.
Been quiet over here this year.
The Drug heads associated with the Apartments haven't been parking on our side of the street.
Haven't seen as much of the 1 man Crack/meth parties much since we got the back yard light.
I may be too much of a fossil to work out the ALPR.
I'm looking at your settings and adopting a couple things
I can't remember how to bring in yolo11 from yolo10....
Click to expand...
I just followed what I seen in the first screenshot of this entire thread
 
Tried objects:0,alpr but it stopped detecting anything, not even the car. Do you have Default/Primary object detection checked or unchecked? And what's in your Custom object models field vs the additional models field? Want to match your exact setup — I'm on the YOLO11 .NET ObjectDetection + ALPR modules.
 
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Tried objects:0,alpr but it stopped detecting anything, not even the car. What's in your Custom object models field vs the additional models field? Want to match your exact setup — I'm on the YOLO11 .NET ObjectDetection + ALPR modules.
 
Blue Iris only hands off the cropped bounding box to the CPAI ALPR/OCR engine if the detected label matches its internal keyword — which is strictly plate or license plate. When your custom model returns DayPlate, BI just sees it as a generic confirmed custom object and stops there without invoking the secondary /v1/vision/alpr endpoint.

To get the full detection -> OCR chain working:

  1. Camera AI Settings -> Custom models: Set this to your plate detector (e.g. license-plate-v5 or alpr).
  2. To confirm: Change DayPlate, NightPlate to just plate, car, truck (or map your custom model labels to output standard plate if you trained it yourself).
  3. Check "License plates": Ensure the dedicated "License plates" checkbox is ticked in the AI tab and set to use local CodeProject.AI.
Once BI gets an object identified specifically as plate, you'll immediately see the secondary alpr OCR command fire in the CPAI server log.
 
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Thanks @MikeLud1 and @Vettester. I'm not really sure how to test to see how 11s does compared to 10s... if I leave 10s as the primary and use 11s as an additional model, will I be able to see any data in the log that shows useful info to compare them?
 
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105437 said:
Thanks @MikeLud1 and @Vettester. I'm not really sure how to test to see how 11s does compared to 10s... if I leave 10s as the primary and use 11s as an additional model, will I be able to see any data in the log that shows useful info to compare them?
Click to expand...
I would change the primary and then using the same camera recreate the trigger using the same object. That way you'll be comparing apples to apples.
 
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I think I am still in AI potty training, mistakenly thinking I'm going to graduate to big boy pants, when really I'm headed towards Depends under garments and a Walker with a slick carry all under the seat, with a " will work for Code Project Ai training." sign tucked away in there , and a Vulnerable Adult ID card.
 
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Reactions: Vettester
MikeLud1 said:
It should show up under Additional models


View attachment 247976
Click to expand...
Hey Mike — hoping you can help me close the last gap on your YOLO11 .NET setup. Everything installs and runs great on GPU (DirectML), and plate detection is solid — my CPAI logs consistently show:

Object Detection (YOLO11 .NET) command 'custom' ['Found DayPlate']

...but the alpr read never fires, so I never get plate text. Jason Hogan explained that Blue Iris only invokes the ALPR/OCR handoff when the detected label matches its internal keyword (plate / license plate), and since your license-plate-v5 model outputs DayPlate/NightPlate, BI treats it as a generic custom object and never calls the reader.

My question: how do I get the ALPR read to trigger? Is there —

a model I should use whose label comes through as plate,
a way to remap the DayPlate/NightPlate label to plate in the ObjectDetection YOLO11 .NET config, or
a different intended Blue Iris config for your modules that I'm missing?

I'm using 5.9.9.98 on Blueiris the attachment shows I'm getting DayPlate But ALPR never seems to fire

Setup: CPAI 2.9.5, ObjectDetection (YOLO11 .NET) 1.4.0 + License Plate Recognition (YOLO11 .NET) 1.1.1, custom model license-plate-v5, "This AI server" (not Plate Recognizer). The ALPR module itself reads fine when I feed a plate image directly through CPAI Explorer (96%) — it's purely the Blue Iris → ALPR trigger that isn't happening off the DayPlate label.

Thanks for the great modules!
 

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fordemon19929 said:
Hey Mike — hoping you can help me close the last gap on your YOLO11 .NET setup. Everything installs and runs great on GPU (DirectML), and plate detection is solid — my CPAI logs consistently show:

Object Detection (YOLO11 .NET) command 'custom' ['Found DayPlate']

...but the alpr read never fires, so I never get plate text. Jason Hogan explained that Blue Iris only invokes the ALPR/OCR handoff when the detected label matches its internal keyword (plate / license plate), and since your license-plate-v5 model outputs DayPlate/NightPlate, BI treats it as a generic custom object and never calls the reader.

My question: how do I get the ALPR read to trigger? Is there —

a model I should use whose label comes through as plate,
a way to remap the DayPlate/NightPlate label to plate in the ObjectDetection YOLO11 .NET config, or
a different intended Blue Iris config for your modules that I'm missing?

I'm using 5.9.9.98 on Blueiris the attachment shows I'm getting DayPlate But ALPR never seems to fire

Setup: CPAI 2.9.5, ObjectDetection (YOLO11 .NET) 1.4.0 + License Plate Recognition (YOLO11 .NET) 1.1.1, custom model license-plate-v5, "This AI server" (not Plate Recognizer). The ALPR module itself reads fine when I feed a plate image directly through CPAI Explorer (96%) — it's purely the Blue Iris → ALPR trigger that isn't happening off the DayPlate label.

Thanks for the great modules!
Click to expand...
Post screenshots of your Blue Iris main AI settings and the AI settings of the camera you are trying to read plates with.
 
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