Synchronization across camera modules in LR

Sachin

We are currently using the RVC2 LR where we are setting them to be synchronized using the following API

left_camera.initialControl.setFrameSyncMode(dai.CameraControl.FrameSyncMode.OUTPUT) center_camera.initialControl.setFrameSyncMode(dai.CameraControl.FrameSyncMode.INPUT) right_camera.initialControl.setFrameSyncMode(dai.CameraControl.FrameSyncMode.INPUT)

However, this setting doesn't seem to keep the same ISO / Exposure for all the 3 cameras.
@Luxonis-Alex previously added camLeft.setCameraToFollow API in one of the branches around 2.23 release.
so is there a way that can be added to main with similar fw changes but with the above frame sync calls ?

erik

Hi @Sachin !🙂
AFAIK AR0234 doesn't provide FSYNC output, that's why, on OAK-D-LR, we use HW timers to trigger FSYNC for these sensors. And correct on setCameraToFollow, so two sensors copy exposure/WB of the third sensor. Let us know if this doesn't work as expected.
Thanks, Erik

Sachin

erik
1. So wee cannot use the FrameSyncMode.OUTPUT to sync the other 2 cameras on the device ? if so how do we make sure all cameras are triggered around same time ? with this setting we have noticed some improvement in better synchronization of the frame.

setCameraToFollow doesn't exist in the new releases or the main to use. can it be pushed to main so that we are not stuck with a spin-off version of old release ?
why not use the same sync API to follow ? and why WB and not the ISO ?

erik

Hi @Sachin ,

No, because AR0234 can't produce it. Can only be INPUT
AFAIK we mainlined develop today (2.28): luxonis/depthai-python1061
As it's not the same, one is FSYNC and the other is 3A settings (should we WB, ISO, Exposure time)