Bias sensitivity DVXplorer Micro

[Alessandro Marchei]

Good morning,

I performed some tests with my DVXplorer Micro, trying to see how my algorithm performs in accuracy by changing the BIAS SENSITIVITY of the device, so from VERY LOW, to VERY HIGH.

However, since I am dealing with graphs and visual representations of the results, I would like to know if there is a numerical quantity I can use to represents those values.

To be more clear, I don't like to use those "very low", "high" etc. words, but rather a value, that could represents the actual threshold.

I cannot find anything on the documentation that could explain what is behind those values in the DV-processing API.

I hope you are able to help me.

Wish you a nice day

Alessandro Marchei

[Luca Longinotti]

The contrast thresholds on DVXplorer have fundamentally 18 values from 0 to 17.

0 means lowest threshold (so higher activity as a small contrast change is enough to generate an event).

17 means highest threshold (so lowest activity as a bigger contrast change is needed to generate an event).

The presets correspond to the following values:

- Very Low: 15

- Low: 12

- Default/Normal: 9

- High: 5

- Very High: 2

The values are the same for ON and OFF contrast thresholds in this case.

A future release of DV will allow all 18 values to be used, doing away with the presets.

Hope this helps, have a nice day!

-- 

Luca Longinotti (llongi)

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

[Alessandro Marchei]

I really appreciate your detailed and fast response, it was really helpful.

However, I guess that it is quite difficult to translate that into physical parameters, like the voltage level at which the electrical signal is compared against, or something similar.
Is there a direct physical quantity that is translated to threshold levels?

Thank you again,

Have a nice day,

Alessandro

[Luca Longinotti]

It's technically the ratio between some currents in the pixel, but since we can't measure them that's not helpful either.

So no, there isn't any direct mapping available at the moment to say 'threshold value 2 is 15% contrast change, threshold value 3 is 19% and so on', you'd have to measure it yourself.

It is on our long-term todo-list to provide more meaningful and complete characterization of the sensors.