Thank you for your fast reply!
But I am not so convinced, the bigger spots in the video are definitely too large for insects. Also the drone causes quite some air movement, soI don't think there are any insects that close. Do you have any other idea to what could be causing them? Because the seriously limit the performance of our algorithm and we need to get rid of them.
Given how bright the sunlight is in the recording, it may be worth reviewing the outdoor sunlight section of Intel's camera tuning guidelines. Left-click on the image below to view in full size.
Noteworthy is the advice that in strong light, "exposure can be reduced to near 1ms, which reduces motion artifacts as well"