Ae3 csi trigger mode and auto exposure

OpenMV Boards
1

On AE3, when csi.IOCTL_SET_TRIGGERED_MODE set to true, does the auto_exposure() and auto_gain() only change exposure time / gain when snapshot() called? And do I need to set framerate() when use trigger mode? Thank you very much

2

Yeah, those functions still do what they normally do. The camera just doesn’t do anything until snapshot is called because it’s in triggered mode.

There’s no frame rate in triggered mode; the frame rate is how fast you can trigger. The framerate() option itself does, though, set an upper limit. So, you should raise that, but the camera doesn’t take a picture until snapshot is called.

3

Hi @kwagyeman Thank you for replying

Yeah, those functions still do what they normally do. The camera just doesn’t do anything until snapshot is called because it’s in triggered mode.

I am sorry that I may not clearly express my question. In trigger mode, sensor only start pixel integration when snapshot() is called. If snapshot is called at 1hz, does auto_exposure change exposure time at 1hz?

4

Yes, exposure happens when the trigger pulses. AEC will update its internal settings based on what is seen in that image unless you force manual control.

5

Thank you for very helpful info