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Anyone witth RFID tech experience?
Felsir:
I'm in a gaming group where we play some tabletop wargames. At the moment I have installed a webcam on the ceiling above our gaming table to make a snapshot each turn. I use the snapshots in MS Visio to overlay arrows and so on to produce battle reports.
So I was thinking; would it be possible to track the units on the table using RFID tags in their bases? I've read that it should be possible to read tags within a 3 meter distance? So I was thinking to use three readers (or 3 antenna) to triangulate the RFID tags. Unfortunately I have no idea where to look; the only readers I was able to find are either close contact readers or industry quality readers used in warehouses.
Anyone have experience or suggestions? Or feedback if my idea makes sense at all?
SavannahLion:
I've read of systems that can activate and read multiple tags but AFAIK it doesn't triangulate positions but rather counts how many of a particular tag is within range.
I suppose you could triangulate the position of a particular tag but that's not an easy thing with off the shelf stuff.
Have you looked at cheaper options. Fluorescent paints that can only be seen by the camera. No work rewuired to tue tsble but every piece must be painted with a dot visible to the camera. Or an IR or UV LED grid under the table. A computer can easily deduce where pieces move based on which LED goes on/off based on snapshots between moves. More work to modify the table but allows any piece to be introduced without modification as long as they adequately cover the LED. An LED sensor array will work too which would get rid of the camera.
Howard_Casto:
I'm with SL on this one. I looked into RFID for a similar project and discovered that it's original intended use (preventing shop lifting) is about all it's good for. You can tell when a tag is within range of a scanner and the tag can hold some info, but other than that you can't really tell where the tag is, where it's pointing, ect. The beauty and downfall of rfid is that the tags are powerless and thus their signal is very sporadic and weak.
Not saying it can't be done, but your webcam approach is probably a better one. Remember, webcams can see IR so that might be of some help.
Howard_Casto:
Oh... also look into AR cards, which is a much easier way to go.... all the big gaming companies seem to use this method. As does the NFL btw. All an ar card consists of is a easily recognizable pattern of lines and shapes that a computer can use to determine position. For football they use the contrast of the green field with the white yard lines. It's more than enough for them to get the position and the angle of the field to overlay graphics.
ark_ader:
Something like this?
It would need some calibration. I'm sure you can get something like this working.
I am currently working on a HCI eye tracking project with NUIA (when it ships), so in theory the Kinect should be capable of tracking the whole table.
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