Amount of light

Timm

Hi,

Does the DepthAI API somehow make it possible to obtain an estimate of the amount of light that was present at the time an image was captured, similar to how I can obtain an estimate of the color temperature via ImgFrame.getColorTemperature()?

Thanks,
Tim

jakaskerl

Timm
Not at the moment I think. I will sync with the team if we can have that exposed.

Thanks,
Jaka

Timm

If it were possible to expose that, it would be great! I'm trying to detect an object by color, which changes with the amount of illumination present in the scene. If I could get an estimate of the amount of light, I'd be able to calibrate my software for different lighting conditions. I bet others would benefit from this ability as well.

Cheers,
Tim

jakaskerl

Timm

That's not available, and besides exposure/ISO it would depend on the sensor performance (pixel size, sensitivity) and the lens (mainly the aperture).
I guess that for a given camera module it could be "calibrated" by measuring exposure/ISO at different light levels with a lux meter, and then interpolated, the amount of light would be inversely proportional to exposure * iso product.

Thanks,
Jaka

Timm

jakaskerl

I'll use the exposure * iso product as a proxy. Maybe that will be sufficient.

Thanks for the suggestion!

Tim