Author Topic: Tracking problem -> not enought IR light? Reflective paper?  (Read 8024 times)

Offline tassl

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Hi!

I have been working with the Finger Tracking the last week, and I am having some problems to track correctly. Exactly, I can see the points, but in a non constant way:

- The points are not stable -> they disappear, and the movement is not smooth.
- More than one point -> although I'm only using one point to track, more than one point is seen sometimes.

I am using an array of 120 IR LED's with an intensity of 100mA/LED (I have checked it). I am not really sure of what can be the problem, and why the tracking is not effective. Then, I have 2 questions for everybody that can help me (specially if you have the system working correctly).

- What is the specification of your working board?
- What kind of reflective paper are you using? How are you using it?

Thank you for your help.



Offline UndCon

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Reply #1 on: October 06, 2008, 01:31:37 AM
I bought some reflective fabrics (like tape on a reel) its a kind that you are supposed to glue on or sew on to your clothes


Cheap and it works...



Offline tassl

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Reply #2 on: October 06, 2008, 10:42:59 AM
I bought some reflective fabrics (like tape on a reel) its a kind that you are supposed to glue on or sew on to your clothes


Cheap and it works...

Hi UndCon,

Thank you for your answer. I have tried with different reflective papers and the accurance is not enought, so I will try with yours.

If you don't mind, I would like to ask you some questions about your configuration:

- What is the electric current of your LED's? I would like to know the results of somebody that have the system working...

- Is your system, with the LED array and reflective paper having a good performance? When I talk about good performance, it's related to the ability to track the points without loosing the signal. Do you also have to point the camera with the reflective paper in order to obtain a good accurancy?

Thanks a lot!



Offline UndCon

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Reply #3 on: November 27, 2008, 08:31:08 AM
It's hard to speak about performance - but it worked and I didn't try it out more

I only used it for some demos in house.

My array is a bit on the weak side, but that is most likely due to the power source not being up to the job so I cannot use it that far away...

I can of course replace the IR_LED's with Vishay's but that requires lots of desoldering and resoldering...

Right now I'm about to get my own arrays working better...
//UndCon