Calculating or Finding the DVXplorer Horizontal Event Scan Rate

[Nick Bruns]

Hi,

I've been working with the DVXplorer and am trying to watch for the movement of event locations. Even on a rigidly stationary camera viewing a object that is not moving away from the camera, I've noticed that there is a horizontal drift of event pixels that moves from left to right and then snaps back to the left.

Using python's dv-processing, how can I extract the rate that events are scanned across the sensor?

[Luca Longinotti]

Hello,

the 'eFPS' (event-frames per second) setting controls the scan rate. By default it's set to 5000 scans per second, variable rate, meaning that if there are many events in a single frame, the rate can temporarily go down.

If exact timing is important you can select a different setting, the constant ones do guarantee constant timing but only up to about 1000 eFPS.

For details see here:

https://docs.inivation.com/hardware/hardware-advanced-usage/biasing.html#dvxplorer-biases

The sliding timestamp plane you see in your data ("timestamp drift") is a bit of an artifact of the DVXplorer camera specifically, as its timestamping is continuous instead of only at the start of an event-frame readout (first pixel of each frame).

Though that start-of-frame timestamp information is currently not exposed in the DVXplorer camera.

Hope this helps, have a nice day!

-- 

Luca Longinotti (llongi)

Senior Software Engineer
iniVation AG - https://inivation.com/
A SynSense Group company