Something we didn't mention is one major issue could be that the IP camera could remain in color all the time with blurry effects you can imagine if there are any sources of light in the neighborhood even far from the lenses (street lighting, neon signs..)
I have tried to summarize other key points in LPR:
- 5-50 mm focal lenses with headlight filter to avoid any glare issues depending on your camera angle and location.
- 5-50 (or 12-40mm..) Gives you a good capture distance, generally 20 m and more to neutralize part of the car speed up to 90Km/h
- AGC (IrisxShutterxGain) should be disable and put to manual value. As said previsoulsy, if you are using good IR projectors your can setup shutter to 1/800, 1/1000. Gain control should be also set to lower value , between 20 -30 instead of maximum in most factory defaults
- Switch to B/W and IR should be automatically monitored to avoid that your camera wait 1 Lux before switching to B/W this will occur blurry effects in the morning and evening. So you have to force your camera to switch tp BW much sooner than the sensor usually do.If you put 1/500 or 1/1000 but your camera doesn't switch or too late in BW mode, your are done.
... The system I know uses IR Projectors with sensors to switch in B/W at 300 lux. That way , your camera will never run out of light in color mode (the camera switchs back in color at 600 lux)
- Two IR long range projectors 10/15° each able to cover 50 m or more" depending on your lenses and the number of lanes you want to take (IR equipped with sensors to remote control the camera day/night profile ?)
- Disable Wdr and DNR and any other post capture processing generating blurr and delay
- Avoid High 264/265 profiles which consume more CPu (BAsic /Main should be sufficient) , use a reduced GOP,move to Mjpeg if you still have issues
- fps : try 25/30 fps and test it ,(don't choose 50 or 60 fps by default which consums much more of everything)
- make sure your bit rate cap is reasonable versus Fps/resolution/compression, and will not decrease your image quality (test it as IPVM does) Be careful is your transmission is Wireless, with lower bandwidth than wires.
- In general: factory settings are your main enemy!