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Jitter when looking straight at the marker

November 1, 2011 - 1:05pm #1

Hi,

I see jitter (target orientation is changing rapidly) when looking straight at the marker, especially from further distances (let's say looking at A4 marker from 1.5 m). Is there something that I can do about it?

I also noticed that my two 5star markers produce significantly different amount of jitter. Could someone give me extra directions how to design a marker which has best detection stability in such conditions?

Thanks,
Paulius

Re: Jitter when looking straight at the marker

November 1, 2011 - 8:56pm #2

Viewing the target "straight on" will produce more jitter than viewing it at an angle, that's an unavoidable property of the tracker.

See this thread for some discussion on smoothing out the jitter: http://ar.qualcomm.at/node/2000763

The TMS will give you good feedback on the number and spread of features in a target, but it isn't good at determining the randomness of the features. A five-star target with a repeating pattern still won't track very well. Make sure that your targets have randomly distributed features.

Do you see much jitter if you drop in the stones target that comes with the samples? It's a pretty good example of dense, random feature distribution.

- Kim

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