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i.MX95 FRDM + OX05B1S: Blue/Purple AR coating reflection on eyeglasses under indoor lighting

Board/Setup:

- SoC: NXP FRDM i.MX95

- Camera Sensor: OmniVision OX05B1S (connected via MIPI CSI)

- Pipeline / Software: libcamera (v0.5.2) + NXP Neo IPA (nxpneo) + GStreamer (imxvideoconvert_g2d)

- BSP: i.MX Linux BSP

Description:
When streaming live video from the OX05B1S camera on the FRDM i.MX95, some of the eyeglasses exhibit a dark blue/purple glare spot under indoor office lighting (see attached images).

How can we resolve this dark blue/purple glare artifact on reflective surfaces (like glasses)? What are the recommended Neo ISP tuning parameters or tuning tool version available for i.MX95 to fix this?

photo_04.jpgphoto_07.jpg

Re: i.MX95 FRDM + OX05B1S: Blue/Purple AR coating reflection on eyeglasses under indoor lighting

Hi @JosephAtNXP,

Thank you for the quick response and the insights regarding the lens flare, tone mapping, and black level configurations.

We do not currently use a third party for ISP tuning. We are using the tuning file provided by NXP for the OX05B1S sensor, which we found located at /usr/share/libcamera/ipa/nxp/neo/ox05b1s.yaml in our BSP.

Is it possible for NXP to provide a newly updated tuning file for the OX05B1S that mitigates this specific lighting artifact?

If an updated file isn't available, could you guide us on the exact parameter changes we should manually adjust in our existing ox05b1s.yaml file to fix this issue?

Looking forward to your guidance.

Regards,
Akash H

Re: i.MX95 FRDM + OX05B1S: Blue/Purple AR coating reflection on eyeglasses under indoor lighting

Hi,

Thank you for your interest in NXP Semiconductor products,

From the attached image, the dark spots seem like lens flares captured from a specific angle and reflected probably by blue light filters in your glasses.

Dark tones might be product of ISP tone mapping or black level configs. I would suggest ISP tuning the sensor,

JosephAtNXP_0-1785175157838.png

In your projects, are sensors tuned by you or third parties?

Regards

Re: i.MX95 FRDM + OX05B1S: Blue/Purple AR coating reflection on eyeglasses under indoor lighting

Hi @akashhalli,

Could you please try with uGuzzi IPA and share the results?

Please share the BSP you are using as well. Try with latest BSP and share if you see any different results.

Regards,

Re: i.MX95 FRDM + OX05B1S: Blue/Purple AR coating reflection on eyeglasses under indoor lighting

Hi @akashhalli,

Did you get any chance to test my suggestions? Could you please create a technical case for follow up?

Regards,

Re: i.MX95 FRDM + OX05B1S: Blue/Purple AR coating reflection on eyeglasses under indoor lighting

Hi @JosephAtNXP ,

The current BSP we are using is Linux 6.12.49_2.2.0.

Regarding testing with uGuzzi IPA, the camera we were using has unfortunately gone bad, so we are currently unable to perform the requested test. We will repeat the test with a working camera setup and share the results once it is available.

We will also check with the latest BSP and update you if we observe any differences.

Regards,
Akash