We are using ZED Mini cameras for a custom built AR headset. For getting the orientation of our headset we use the camera’s IMU information. From time to time it happens that the IMU calibration information gets lost and the camera is “spinning” in the “ZED Sensor Viewer” tool as described in the f…

Hi @marti Welcome to the Stereolabs community. When the ZED SDK opens the camera it performs a quick recalibration of the IMU to remove gyro biases that can be caused by temperature variations. If your camera moves while the calibration is performed, it’s possible that wrong values are stored and…

Thanks for you quick response. How long does this quick recalibration take and when in the initialization phase is it done? Is there any way how we can detect these wrong values and react on it with the help of the SDK?

[image] marti: How long does this quick recalibration take and when in the initialization phase is it done? It’s quick, it takes a few milliseconds. [image] marti: Is there any way how we can detect these wrong values and react on it with the help of the SDK? It’s not currently possib…

Hi @Myzhar It has been a while since last time, but as we are still facing the problems mentioned above I am contacting you again regarding this issue. I just read in the release notes of the new SDK version 5.5 that there has been some work done that may help us to solve the issue: Fixed the IM…

[image] marti: May this have something to do with the temperature compensation or do you think that it is purely a problem of vibrations? Yes, this is possible. Any feedback concerning the procedure that I suggested in my previous message?

Thanks for your quick reply. [image] Myzhar: Any feedback concerning the procedure that I suggested in my previous message? Not sure which procedure you mean… The problem with the IMU recalibration is that the systems do not have a monitor / mouse / keyboard attached. They are remotely cont…

[image] marti: Not sure which procedure you mean… The one linked in my first reply: [image] Something's wrong with my Zed Mini IMU ZED Mini When you see the camera “spinning” in the “ZED Sensor Viewer” tool, that means that for some reason it lost the IM…

Recalibration works of course and solves the issue. We are currently looking for ways how we can implement it in our system so that it works for our users. Our next release is on 5.2.3 and we did not test 5.5 yet. But as said, it is very hard, if not impossible, for me to reproduce the behaviour or…

ZED Mini IMU calibration lost - Reason?

Hardware ZED Mini

Myzhar October 8, 2026, 1:43pm 8

The one linked in my first reply:

You need at least an ssh session to run it.

Have you tested a recent version of the ZED SDK? Is the problem still present with v5.5?