Dave the Funkatron said the following on 05/06/2008 03:00:
> Hey all,
>
> I have some general questions about how to turn raw optically captured
> marker data into an actual skeletal animation. It seems like several
> problems can pop up along the way. This is all probably elementary
> stuff, but so I think I just need a ****ge toward some tools,
> techniques, research papers, etc.
>
> First, the skeletal segments are generally treated as rigid, but the
> human body (at least the flesh part) is rather deformable. So, markers
> tend to slide around on the body, if ever so slightly. So, if I try to
> fit a rigid skeleton to that data, I won't be able to find an exact
> solution. Well, I can get a best fit, but the fit between adjacent
> poses in the time-line might be quite different and so I would get
> discontinuities in the animation.
>
> Another issue is that I might actually lose a marker or two along the
> way, and have to fill in the data along the way. It seems common
> enough to interpolate in these cases, but that also has an effect on
> the best fit, and might cause more discontinuity.
>
> I'm sure that there are other problems that I have not even thought
> of.
>
> It seems like people would have run into these problems before, though
> I can't seem to find any research papers on the subject. I have been
> told that tools like Motion Builder can do some clean-up, but is not a
> bullet-proof solution. So, can anyone suggest alternatives or places
> to start looking?
>
> Thanks.
>
> Dave
>
Maybe some kindly student soul could take the data, im****t it into a
'home brewed' program which can do some mathematics on the data? It
shouldn't be hard to do as audio editors do the same sort of thing
with low-pass filtering and click removal. The data can then be
written back out to a file in the same format as the original and tested.
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