[ros-users] ar_pose orientation accuracy

[Herman Bruyninckx]

On Mon, 8 Nov 2010, Steven Bellens wrote:

> 2010/11/8 Steven Bellens <steven.bellens at mech.kuleuven.be>:
>> Hi,
>>
>> I'm experimenting a bit with the ar_pose package. I'm using a single
>> fixed camera to track a moving marker. To verify the estimation
>> accuracy, I just leave the marker fixed and I've plotted position and
>> orientation estimates. The position estimates are pretty much
>> constant, but the orientation estimates are oscilating a lot (see
>> appendix), and apparently always between two values. Is this because
>> of the bad capability to estimate that orientation or can this be
>> caused by the environment conditions (light - set-up - distance to
>> marker)?
>
> For clarity, plotted are the 4 components of a unit quaternion.

So...? What does a jump of "0.1" quaternion units mean? And is this meaning
the same for each of the four components?

The answer to this last question is probably "no", hence...?

Herman