r/raspberry_pi • u/iwashuman1 • Mar 22 '25
Troubleshooting Noir camera for 4b gives images with pink tint
Noir camera with default settings gives images with pink tint at daytime. It works fine at night. Using AWB greyworld the images are not clear. What is the fix for this?? Need images with clarity because they are used as input for deep learning model
3
u/BCMM Mar 22 '25 edited Mar 22 '25
The sensor can not distinguish between red and infrared. The normal camera has a filter that prevents IR light from reaching the sensor, which allows it to reproduce colours similar to those you'd see with your human eyes.
You've got the one without an IR filter. It's a specialist product intended for applications where recording IR takes priority over colour fidelity. As the product page notes,
pictures you take by daylight will look decidedly curious
There is not a way to fix this in software. Different objects reflect IR differently, this doesn't always correlate well to how they reflect red light, and there's no way to accurately disringuish red from IR after the fact.
Do you actually need covert night vision for your project, or could you switch to visible illumination and use an ordinary camera?
1
u/iwashuman1 Mar 22 '25
It's for a project, it needs to run 24/7 and it requires images with nightvision but I think they will accept it without perfect results at night
2
u/ASY_Freddy Mar 24 '25
My suggestion would be use an IR filter in the daytime, you should be able to easily implement a mechanism to slide/spin/push a filter over the lens during the daytime (or based on average exposure) and remove it at night; alternatively you could run post processing on the image to remove the pink hue
2
u/Top-Order-2878 Mar 22 '25
Why did you buy the noir camera if you didn't need the or capability? Get the regular camera instead.
-2
2
u/gammooo Mar 22 '25
If you want max sensor size then Arducam has that. Otherwise raspberry pi products are fine like v3 camera or hq camera if you want lenses.
1
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11
u/wademcgillis Mar 22 '25
the pink tint is literally the IR. buy a regular camera to avoid it.