Autoexposure Problem.

BearrGod

Hello everyone.
I'm having trouble with the 4PFFC regarding the autoexposition.
Here is my setup
-socket CAM_A : IMX577 4056 x 3040 focus:fixed - COLOR
-socket CAM_B : OV9282 1280 x 800 focus:fixed - MONO COLOR
-socket CAM_C : OV9282 1280 x 800 focus:fixed - MONO COLOR
-socket CAM_D : OV9282 1280 x 800 focus:fixed - MONO COLOR

When i close the cameras on socket B (with a black tape) , thus turning the image all dark, the image on
the socket C turns all white.

The issue is easliy reproducable by using the cam_test.py script of the
depthai-python repository.
I would like to get some advice or help on how to solve that problem.
Best regards

jakaskerl

Hi @BearrGod
CAM_B and CAM_C are intended for stereo use, so cameras connected to these two sockets will share the same settings (sockets shared i2c bus). And socket B is the master socket (drives the left one). So covering the CAM_B sensor, will kick in the 3A - autoexposure, which will tell the CAM_B to increase its exposure time in order to brighten the image. This will in turn also increase the CAM_C exposure time, causing the other sensor to produce an overexposed - WHITE image.

You can't disable this other than:

manually setting the exposure time
setting exposure time limit
locking the exposure time to current value

See possible controls: https://docs.luxonis.com/software/depthai-components/messages/camera_control/

Thanks,
Jaka