| ??? 02/26/10 06:28 Read: times |
#173584 - Why not start by answering the questions asked? Responding to: ???'s previous message |
There are lots of commercially available devices using various motion detection schemes.
If you go back and look at some of Chico Magalhães' threads, you'll find a long thread about a scheme for projecting an image onto a wall. The same basic technology can be applied to what you're doing. You have one LED/Laser diode in a room, together with somewhere between 2 and 2 thousand (your choice) detectors. The source is scanned by any of the methods discussed, and is sensed by any or all of the sensors. What you'd be looking for is a change in the patter of occlusion, which suggests something, a cat or dog, or perhaps an intruder, is moving about. That's your detection mechanism. Using IR, humans won't see the scanned beam. IR doesn't have to be particularly intense at ranges of less than 10 meters. The disadvantage is, of course, that this really only works in one room. Does this meet your requirements? RE |
| Topic | Author | Date |
| Perimeter intrusion detection | 01/01/70 00:00 | |
| comments | 01/01/70 00:00 | |
| human-filtering the result | 01/01/70 00:00 | |
I wonder ... | 01/01/70 00:00 | |
| What's the size (Length, width, height) of the "fence"? | 01/01/70 00:00 | |
| Muxing and filtering | 01/01/70 00:00 | |
| Machine Vision? | 01/01/70 00:00 | |
| Machine vision. | 01/01/70 00:00 | |
| The problem with machine vision | 01/01/70 00:00 | |
| Thanks Jez, but it would be expensive! | 01/01/70 00:00 | |
| Why not start by answering the questions asked? | 01/01/70 00:00 | |
| Light Curtain | 01/01/70 00:00 | |
| Answers and light curtain | 01/01/70 00:00 | |
| human filtering | 01/01/70 00:00 |