How to deal with hot pixel in DVXplorer Lite

[ZiMin Er]

Hello,

As the title stated, I found out that my DVXplorer Lite has some hot pixel (the pixel which "on" all the time even though there is no on going activity) which I am trying to filter those out without using "dvsnoisefilter" module. 

I wonder if there is any way to figure out the specific position of the hot pixel and turn off that specific hot pixel position directly in DV software?

Regards,

ER Zi Min

[Luca Longinotti]

Hello, the dvsnoisefilter does support hot pixel filtering.
Open the full options, you'll find one called 'Hot-pixel filter
enable', the pixels to filter are specified in a list, which you can
have auto-filled by pressing the 'Train hot-pixels' button. If the list
stays empty, meaning none are found, you can play with the time/number
parameters for the detection and lower them.
During training point the DVXplorer at a wall and don't move it.

In general DVXplorers should generate almost no hot pixels, and even
those that are always active should generate a relatively small amount
of events, no more than 5k events per pixel. Are they always the same
ones you see active with no stimulus? What event-rate are you getting?

[ZiMin Er]

Hi Luca,

Thank you for your reply. I will try it out when I am back to office on Monday.

From the picture that I shown at the very beginning, some of them are just random noises (with very low bias sensitivity) which appear and disappear over the different event frames. However, I am pretty sure there are at least 5-6 pixels are hot pixels because those pixels are always being turned on with no stimulus when I observe the event frame over time. Also, I can't remember the event rate for my DVXplorer Lite. I will get back to you when I test it out on Monday.

Speaking about the event rate, I plan to limit the event rate at a top cap of 1.5MEPS for my DVXplorer-Lite. I wonder if there is a way to do it with the ROS package(rpg_dvs_ros) or DV software?

Regards,

ER Zi Min

[Luca Longinotti]

Regardint max rate limiting, not really. There are settings that can
reduce the bandwidth, like the Refractory filter in the Noisefilter
module, or the Decimation module, but currently no max bandwidth
limiter that would dynamically adapt to the bandwidth.

--
Luca Longinotti (llongi)

Software Engineer
iniVation AG - https://inivation.com/
Zurich, Switzerland
Office: +41 44 500 32 14

Support - https://inivation.com/support/