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Registered Member #1550
Joined: Tue Jun 17 2008, 04:46PM
Location:
Posts: 8
I was wondering if anyone has any experince or knowlege about human detection through a camera or through a IR camera. Anything would be a great help, or any links and such. I do have programming and some inbedded electronics know how. Thanks beforehand.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
You need to specify much closer what you are after. Do you want 100% accurate detection of humans with no false detections under any condition? Or do you want a LED to come on when there is movement?
The first is impossible even for humans and the second is fairly easy.
Registered Member #1550
Joined: Tue Jun 17 2008, 04:46PM
Location:
Posts: 8
Huh? Of course the first is impossible! Anyway, my project is to use an IR camera to pick up th heat of a human presence and set off an alarm. This has been done before, just wondering how its done, and if its possible for me to do it. Also, I'm not even looking for 90% accuracy, more along the lines of about 80%, with a 20% chance of mistaking something else for human. I wanted to do this with a paintball sentery, which is more than possible if the first is possible...thats about it. I had a more complex idea, which will probably be toned down.
Registered Member #1550
Joined: Tue Jun 17 2008, 04:46PM
Location:
Posts: 8
Well, now that I think about it, it would be way out of my budget to do thermal.
I was thinking on making a unmanned paintball turret better. They all use a Camera of some kind to detect motion. I think they do it by getting the camera to take one still frame and compare it to the next frame, and do this over and over until some motion sets the thing off. I wanted to build one with much better improvements, like multiple cameras and such in order to more accuratly hit the enemy.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
Hehe.. I wanted to try my idea of using an array of PIR sensors rotating on a small wheel, so that it can also locate the heat signature. Might also have applications for automated deployment of halon/CO2 extinguishers inside server rooms in the event of a fire.
I also read somewhere that certain polymers (PVDF etc) and also conjugated polymers such as those used in PLED screens can be pyroelectric. Perhaps this could be useful, locate a dead cellphone with an intact screen, fabricate PCB and use the conducting strip from a spare calculator to interface circuitry to the screen in order to form a 16*8 sensing array.
(silver is no good, it does connect but the resolution is too low even with my epoxy line separation trick)
Also, DO NOT EVER remove the back plate, these screens are insanely water sensitive even if you reseal them in epoxy after removal.
I expect that the low level signal available would need maybe 2-5* the amplification required from a conventional PIR sensor, so an array of quad opamps would be needed.
Maybe I am onto something here, a cheap and simple makeshift "thermal camera" that doesen't cost £10,000, albeit far lower resolution.
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
If not a few years back I found a project that some dude did that targeted, locked on, and tracked targets, and could shoot paintballs too boot I think, he fit all the electronics in pc case or 2 I think I'll try and find it hee in a few, and re-edit this post if I do find it.
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human detection
