Hello! We are using the Oak-D Pro Wide PoE to count objects inside trucks. So we installed the camera on a metal struture, point the camera to the ground and the trucks pass by the metal gate. Sometimes the operation goes until night, so we put lights on the gate so we can see it. The problem is, due to the difference on fps of the camera and the frequency of the light we experience camera flicker (like the video below) Is there any algorithm on Oak documentation that can help with that? Improve the fps until 60 is impossible, the camera almost don't keep at 10.

[upl-image-preview url=https://discuss.luxonis.com/assets/files/2024-08-26/1724695025-877975-ezgifcom-optimize-2.gif]

Hello, I make the proposed changes, but now I have to wait until night to test it. Here the MRE link if you want to check. [MRE Link](https://drive.google.com/drive/folders/1cTpryiUdZeFCPEOfV79EmvA0ze3SeWjZ?usp=sharing) (on Google Drive) Thanks you for the help.

@"ThiagoPiovesan"#p25638 Still far from MRE. - If you remove the NN, is the issue solved? I doubt the flickering issue is due to NN inference. - Remove unwarping, check if issue is resolved. - Only keep the camera streams as long as it plays a role in flickering. Thanks, Jaka

Light flickering on camera

jakaskerl

ThiagoPiovesan
Try setting the anti-banding mode:

cam.initialControl.setAntiBandingMode(dai.CameraControl.AntiBandingMode.MAINS_60_HZ)

Thanks,
Jaka

ThiagoPiovesan

Hello,

I have tried this solution and it didn't work. The camera FPS starts normal and a few seconds after it goes to 0.

ctrl = dai.CameraControl()
ctrl.setAntiBandingMode(dai.CameraControl.AntiBandingMode.MAINS_60_HZ)

Any idea?

erik

@ThiagoPiovesan could you provide full MRE?
You should set the cam.initialControl, otherwise you'd need to send the message to the camera over xLinkIn
Thanks, Erik

ThiagoPiovesan

Hello, I make the proposed changes, but now I have to wait until night to test it.

Here the MRE link if you want to check. MRE Link (on Google Drive)

Thanks you for the help.

ThiagoPiovesan

Hi, I've tried it, but it doesn't work.

Could you please check the code i sent, just to see if there is nothing wrong, or suggest another alternative.

Thanks

jakaskerl

Hi ThiagoPiovesan
This code is far from minimal. I don't want to run any code that creates extra directories on my PC. Only keep the depthai code.

Thanks,
Jaka

ThiagoPiovesan

Hello,

My bad, I forgot to remove all the IO operations. I changed the code.

Could you take a look again please.

jakaskerl

ThiagoPiovesan
Still far from MRE.

If you remove the NN, is the issue solved? I doubt the flickering issue is due to NN inference.
Remove unwarping, check if issue is resolved.
Only keep the camera streams as long as it plays a role in flickering.

Thanks,
Jaka

ThiagoPiovesan

Hello,

I will try it, but at the end I can't let them in my final code. I need to use NN and undistorted image.

But I'll post here the results

Thanks

jakaskerl

ThiagoPiovesan
Yes, I understand. This is just so we can debug the issue. If we find the flicker is due to undistortion, we can focus on that later.

Just trying to figure out the source of the error.

Thanks,
Jaka

DanGoodrick

What was the resolution on this? Anti-banding isn't working for me either.

jakaskerl

DanGoodrick
Can you create a MRE? AFAIK this never reached resolution.

Thanks,
Jaka