Frame timestamp details

[Hang Su]

I used Python dv module to read Aedat4 file which recorded on my DAVIS 346. And I found that each frame has 5 corresponding timestamps (timestamp, timestamp_start_of_time, timestamp_end_of_time, timestamp_start_of_exposure, timestamp_end_of_exposure). 

I can literally understand the last two timestamps. But I was confused about the start of time and the end of time. And I was also wondering how the frame timestamp is defined. 

Looking forward to further explanation.

[Luca Longinotti]

The start and end of frame timestamps contain information about when
the readout for a frame started and finished. This usually begins
before exposure (reset read) and finishes after exposure ends (signal
read).
The 'main' timestamp is the mid-point of the exposure:
(ExposureEnd - ExposureStart) / 2
It was the most meaningful single timestamp we could think of given the
data type.
Hope this helps, have a great week!