are my cameras in good locations?
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Author:  PokedudeSFM [ Tue Mar 01, 2022 11:45 am ]
Post subject:  are my cameras in good locations?

Just moved to a larger place. But not sure if this is good.

Seem to be getting a lot of tracking errors with the arms, but not sure if this is the reason why.

Author:  vmaslov [ Wed Mar 02, 2022 3:48 am ]
Post subject:  Re: are my cameras in good locations?

This depends on where is your capture area.
In general, the second camera looks too high to me. Also, its view is cluttered with background objects some of which appear to be moving.
However, tracking errors can be caused simply by inaccurate calibration or acting in a way that arms are poorly visible to both cameras.
You can share one of your videos to get a specific advice.

Author:  Greenlaw [ Wed Mar 02, 2022 12:08 pm ]
Post subject:  Re: are my cameras in good locations?

I agree, the cameras look way too high. High up can be considered if you're lying on the floor so the camera can better see the position of the limbs and head.

But in general, a range closer to eye level and lower works better for most 'standing up' motions, at least in my experience.

The key is to consider what the cameras and iPi Mocap Studio needs to see when it's tracking. In other words, the more it can see, the more accurate the tracking. Or conversely, it can't track what it can't see.

As for why the arms aren't tracking accurately, that's hard to discern from these two images.

If I were to make a guess, maybe it's the clothing you wore when recording the actions? Mocap Studio expects to see a clear human shape, so I would avoid wearing loose or baggy clothing, like large T-shirts, hoodies or sweat pants. You don't need skin tight clothing but it should be somewhat close fitting so the limb shapes and torso are easy to read.

Hope this helps.

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