Flir Lepton Experience?

[danabee3]

Hi all,

Does anyone have any experience with the FLIR Lepton 3? (160 x 120).
I'm looking to do on-board thermal image processing from a drone (for fire detection) and found that the FLIR Lepton is easily integratable with the Raspberry Pi. However, I'm quite worried about the resolution of the camera, and was wondering if any one has any experience flying this camera from high up? with images or video footage that I can look at? All the videos i've seen are from very close up.
Our goal is to detect a fire of 0.75 x 0.75 meters from a maximum height of 50 meters if that helps.

Thanks in advance ,
Dana

[Chanc3]

Check out footage from the FLIR Duo, that uses a Lepton 3 core. Designed for drones, albeit crap resolution for it.


Sent from my iPad using Tapatalk

[-jeffB]

Wow, my trigonometry is rustier than I thought. But at 50m distance, with a 50-degree FOV, you'd see a patch of terrain around 50 meters wide. That's diagonal, I assume, so a 160x120 image works out to something like 4 pixels per meter, 25cm per pixel. Your fire would be at least 3x3 pixels on the sensor in that case.

But, of course, fires are hot -- far hotter than anything else in the scene. Even a fire much smaller than a single pixel might be fairly obvious in the image.

If you want to discern details about the shape of the fire, the Lepton probably wouldn't help you much at that range. But detecting the presence of small fires should be easy, I'd think...?

[rankink]

I don't own a drone, but could probably hold mine off of the top of my building (around fifty feet) if that would help.

[cynfab]

check out this video I did over a year ago with my 3DR Solo and a Flir One G2. Custom software on an ARM SBC between the F1G2 and Solo's HDMI input.
https://www.eevblog.com/forum/thermal-imaging/question-about-flir-one-for-android/msg925953/#msg925953
That thread has lots of info on the custom software. The project is on hold now awaiting further kernel driver development for a different SBC.