Help with troublesome plate night captures

[Mark_M]

Looking at this video, what settings would you start change to capture the rear plate better?
Front plate was captured fine. I guess is old and has less reflective coating?

I've had this before with black background plates with white text.

View attachment NVR_ch5_20240526195122_20240526195140 - Trim.mp4

 

[Valiant]

Image looks very grainy. I would definitely reduce the gain. You most likely need more IR light. Not all plates will reflect the same. I see many where people deliberately damage the coating.

Which state is that plate from ?, I don't recognise the font.

 

[Mark_M]

Image looks very grainy. I would definitely reduce the gain. You most likely need more IR light. Not all plates will reflect the same. I see many where people deliberately damage the coating.
Which state is that plate from ?, I don't recognise the font.

Gain is certainly something I can see being an issue. This camera is 5mp designed LPR at 50fps.
Adjusting gain is going to take some trial for another night (Very few cars traveling past tonight). Playing around with 2D & 3D noise reduction settings I either get more grainy or white blob, certainly the gain than post-processing.
Plates are NZ.

 

[bigredfish]

Are you using the onboard IR or external Illuminator? First gut reaction is not enough IR or bad angle on IR.

But it could just be a bad old dirty plate.

Either way the rear plate isn’t reflecting IR much

 

[Mark_M]

Are you using the onboard IR or external Illuminator? First gut reaction is not enough IR or bad angle on IR.
But it could just be a bad old dirty plate.
Either way the rear plate isn’t reflecting IR much

Bad angle is part of it.
Camera is ~5ft high and ~80ft distance to plate. Offset from the road I think is around 25deg (ouch).
Built in IR of my Milesight LPR camera. The sucker draws ~17w at night with IR on, surely there's enough IR with 'far IR' set to 100%.

 

[bigredfish]

Im thinking maybe angle, not the 25 degree offset, thats fine, but like the camera IR is angled down maybe.? There doesnt appear to be much if any IR hitting that far rear plate