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PostPosted: Sun Aug 30, 2015 8:32 am 

Joined: Mon Aug 03, 2009 1:34 pm
Posts: 2423
Location: Los Angeles
Thanks for the prompt answer. I'll write again once I get the new system set up and running.

Very excited about this. :)

G.

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PostPosted: Wed Sep 02, 2015 3:47 am 

Joined: Thu Sep 04, 2014 9:47 am
Posts: 897
Location: Florida USA
...

Yeah tilt is smooth, so setting it is easy, I have been using about a 10 degree down tilt in my area, to not view more of the ceiling than necessary.

I have tried many different heights and tilts and now I use between 3 ft and 4.5 ft (chest level) for my area with the 1 cam.

I hope you can post a video of the 4 cam set up soon once set up, I am interested in seeing it.

By the way... watch having anything plugged into another USB 3.0 port that is drawing power (being used) it could cause camera freezes.

I had to plug my ASUS BT211 into where my mouse was plugged for it to work properly or Moves would lock up and camera would freeze.

I could plug my wired mouse into a USB 3.0 port and that is drawing power, but the BT adapter caused issues, which I thought was a USB 3.0 compatible device, but troubleshooting said plug it into a USB 2.0 port, switched ports and everything worked fine.

If using a wireless USB mouse, you may have to make adjustments, I don't know, but I left my BT400 adapter plugged in and on and experienced camera freezes.

Also, I see on my camera it reads the floor depth as higher than the iPi floor grid is set, but with my 1 cam, adjusting the floor of the Kinect to the grid made the tracking worse, so I just leave it as it appears and it works fine, but that's my cam, I don't know if it's this way for all cams or multi-cams, not enough feedback from other users to know yet and nothing stated this is a common camera view in the iPi Docs, I just know it's how my camera shows the floor depth.

Good Luck!

...


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PostPosted: Wed Sep 02, 2015 7:06 am 

Joined: Mon Aug 03, 2009 1:34 pm
Posts: 2423
Location: Los Angeles
Wow, that was fast. The gear arrived Monday evening.

Attachment:
NewMocapGear.jpg
NewMocapGear.jpg [ 86.22 KiB | Viewed 36875 times ]


I might have time to install the cards tonight. Not sure when I can test yet...maybe this weekend.

G.

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PostPosted: Wed Sep 02, 2015 7:26 am 

Joined: Mon Aug 03, 2009 1:34 pm
Posts: 2423
Location: Los Angeles
Quote:
I have tried many different heights and tilts and now I use between 3 ft and 4.5 ft (chest level) for my area with the 1 cam.

About 3 - 4 feet was the optimal height for multi-Kinect v1 as well. When I used the tilt, it was subtle...mainly for alignment with a mark or object I placed in the center of the floor.

We also have a large brown rug in the room that's about the size of the capture space. It wasn't brought in for this purpose, it was just conveniently there. Here's a very old dual Kinect v1 video shot using iPi Desktop Motion Capture 1.0. when my daughter was five. You can see the carpet on the floor: Mocap with small child

This was not bad considering it was over three years ago and iPi DMC 1.0 was not optimized for children and Kinect v1 support was still technically a beta feature.

Even today's dual Kinect v1 is much more advanced than this was but I think I'd like to re-recreate this with my daughter now at 8 with the new quad Kinect v2 system for comparison--except she's probably gotten too self-conscious to just let go like this anymore. I'll see if I can talk her into it.

i just asked her. She said she'll think about it. :)

G.

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PostPosted: Wed Sep 02, 2015 8:47 am 

Joined: Mon Aug 03, 2009 1:34 pm
Posts: 2423
Location: Los Angeles
The floor mismatch you're seeing does sound odd.

Kinect capture has always positioned the floor a little high. I think this position might be considered optimal for walking around but it could also cause problems when crouching or sitting on the floor. The developers added the adjustable floor to allow users to compensate for this situation.

However, I don't think the floors shouldn't be mismatched like that between different devices during calibration. But it doesn't sound like it's having any adverse affects for you? That seems odd too.

I'll watch for that in my own tests later this week. Thanks for the heads up.

G.

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PostPosted: Wed Sep 02, 2015 9:02 am 

Joined: Thu Sep 04, 2014 9:47 am
Posts: 897
Location: Florida USA
...

I would like to hear if this floor detection happening for you also, with just one camera, I will never use 4, actually I think 2 will perform very well, all I need it for would be a bit better rotation tracking, but one does really well compared to KV1, 4 of course will give you less occluded spots, like when arms cross or are held more level in specific areas.

Well now it looks like you are very close to finding out on your own, but I already know you will be impressed :)

Can't wait to see some video posts of your trackings.

...


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PostPosted: Wed Sep 02, 2015 10:47 am 

Joined: Tue Aug 11, 2015 8:53 am
Posts: 35
Yea, Me too


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PostPosted: Wed Sep 02, 2015 11:35 am 

Joined: Mon Aug 03, 2009 1:34 pm
Posts: 2423
Location: Los Angeles
Snapz wrote:
...I will never use 4, actually I think 2 will perform very well, all I need it for would be a bit better rotation tracking...


Yes, two v2 devices should be significantly better than one v2 device.

In my experience with multi-Kinect v1, using two v1 devices is a HUGE improvement over using a single v1 device. As mentioned elsewhere, I used the dual system to create short visual effects shots for a handful of b-movies for SyFy channel during the 2013 - 2014 seasons. I'll see if I can post some of that footage with the setups for comparison.

I used the triple configuration on a couple shots and it improves the occlusion issue even further. But I think two devices is adequate for many positions. In fact, when I'm pressed for time, I still use two for many captures because it's faster to set up and faster to track. For many common poses/motions, you might not notice a big difference. I mainly use the triple Kinect system for difficult motions.

This year I'm back to using mocap only for our own short film productions, and what I'm hoping to gain from the quad Kinect configuration is smoother raw data and fewer tracking errors. That should speed up the process but I think the tradeoff could be that my old computer will take a bit longer to track the v2 data. We'll see.

If it turns out to be much slower, I'll just have to deal with it because I basically used my 'new desktop computer' budget for the upgraded mocap gear. :p

Stay tuned.

G.

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PostPosted: Wed Sep 02, 2015 3:22 pm 

Joined: Mon Aug 03, 2009 1:34 pm
Posts: 2423
Location: Los Angeles
Oh, and another reason for upgrading is that I've had two Kinect for Windows v1 devices go bad since I started using them, and they've become virtually impossible to replace.

I currently have one spare v1 device as a backup but since the v2 devices are so readily available and cheaper to replace, I figure it's time to make the switch.

G.

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PostPosted: Thu Sep 03, 2015 8:22 am 

Joined: Mon Aug 03, 2009 1:34 pm
Posts: 2423
Location: Los Angeles
I thought I was missing something. These arrived yesterday.

Attachment:
KinectAdapters.jpg
KinectAdapters.jpg [ 61.41 KiB | Viewed 36858 times ]


Okay, so NOW I'm ready. :)

The cost per Kinect v2 compared to the old Kinect v1 for Windows is still pretty good but I forgot to mention that you need to include the cost of a PC adapter (about $50). This is still cheaper than what Kinect for Windows v1 with the bundled adapter cost (around $200 back when they were common) but getting four Kinect v2 devices at once might seem pricey (say, compared to multiple PS3 Eye cameras.) Considering all the points mentioned earlier, if it delivers on improved accuracy, I think will be worth it.

Will post another report sometime this weekend.

G.

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