Illuminance value measurement

yeo

Hi luxonis,
I tested a mono camera for night vision.
As a result of the test, when the left mono camera was covered, the set ir sensor seemed to work. Is that correct?
Then, I want to change according to the illuminance value, but is it possible to measure the illuminance value?
In conclusion, I want to stream color camera -> mono camera according to the illuminance value. can you give me a hint?
Thanks

OS : ubuntu 20.04 lts
camera : oak-d Pro W
depthai version : version: 2.19.1.0
USB : USB 3.0

erik

Hi yeo ,

when the left mono camera was covered, the set ir sensor seemed to work. Is that correct?

Set IR doesn't take into account anything from the sensors. It just sets the current through the LED.
You could do some computer vision on the host and corresponding to illuminance throughout the whole frame control the LED (even simple controller should work).

I want to stream color camera -> mono camera according to the illuminance value

Color camera has IR filter in the CCM, so night vision isn't possible. Only mono cameras can see (specific) IR.
THoughts?
Thanks, Erik

yeo

erik

If you turn on the mono camera and cover the left part of the mono camera with my palm,
The overall brightness of the screen displayed by cv.imshow is increased.
So it looks like the screen brightness is adjusted according to the illumination.
Is there no way to measure and display illuminance data from the camera?

        device.setIrLaserDotProjectorBrightness(300) # in mA, 0..1200
        device.setIrFloodLightBrightness(400) # in mA, 0..1500

I have already set the illuminance current.

Color camera has IR filter in the CCM, so night vision isn't possible. Only mono cameras can see (specific) IR.
THoughts?

How do I change the streaming mode?
ex) Color camera during the day, mono camera under a certain level of illumination (or when night vision is activated)

erik

Hi yeo ,

The overall brightness of the screen displayed by cv.imshow is increased.

That's because both mono cameras use the same sensitvity/exposure time, so when one is dark (you cover it with your palm), it will increase senstivitiy/exposure time, resulting in the other camera looking overexposed (bright).

Is there no way to measure and display illuminance data from the camera?

You can eg. average all pixel values of the mono frame, and if it's low it means it's too dark, and if it's high it's too bright. But you can do some smart CV operations as well.

How do I change the streaming mode?

You can use Script mode to switch between color camera and mono camera, example here.

Thanks, Erik