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PostPosted: Sun Aug 30, 2009 7:16 am 

Joined: Sun Aug 02, 2009 10:57 am
Posts: 107
Michael - I noticed you suggested in a thread the user wear a black T-shirt rather than a white one.

What would the ideal attire be?

What if the actor was in black, but had yellow patches on his elbows, yellow gloves, yellow patches on knees, etc.

Maybe use fluorescent masking tape on certain areas to make it easier for your software?

Put the tape on the shoes, wear something (a yellow ski mask) on is head, etc?

What would be the ideal way to set up an actor?


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PostPosted: Mon Aug 31, 2009 10:30 am 

Joined: Mon Aug 03, 2009 1:34 pm
Posts: 2265
Location: Los Angeles
I've been wearing a short sleeved black T with a skin-tight long-sleeved bicycle shirt underneath, blue or gray sweat pants (not the baggy kind,) and white socks. As a fashion statement this is pretty horrible, but for iPi it seems to work well.

I believe the thing to think about is contrast--the software needs to distinguish where your arms are in relation to the body and shoulder (thus the different body/sleeve colors.) Early on, before the white long-sleeved shirt, I tried white cotton gloves to help separate my hands from my arms, but I stopped when I started wearing the white shirt to help distinguish the hands (basically, reversing the colors.) This is probably better since the software has the option to see the hands color the same as the face color.

It's probably a good idea to not have a black background. I'm guessing that the software performs a difference key to separate the moving figure from the background, but a black background probably confuses the outline a little by blending with the shirt and dark pants.

Actually, I wonder if it might even be better to have a normal room background (i.e, with furniture, bookcases, etc.,) rather than a solid color 'studio' background to assist iPi with virtual camera placement. (Maybe Michael can confirm this?)

Bear in mind that these are just assumptions based on my own testing and experience, and not official information. Hopefully, the next release of the manual will provide more details about what the software looks for when tracking a figure.

Greenlaw

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PostPosted: Mon Aug 31, 2009 11:01 am 

Joined: Mon Aug 03, 2009 1:34 pm
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Location: Los Angeles
Getting back to your idea about color patches, I've been wondering if it would be helpful to use colored tape circled around the elbow and knee joints, or if this would just confuse iPi.

Micheal? :)

Greenlaw

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PostPosted: Mon Aug 31, 2009 11:02 am 

Joined: Sun Aug 02, 2009 10:57 am
Posts: 107
Greenlaw - good thinking on the clothes. I'll look forward to Michael's comments.

Finally got in my DELL, so should be able to start playing with this.

As to the background, you might look at some of the video tutorials here:

http://www.ssontech.com/learning.htm

I'd guess that what makes for a good background with SythEyes - would make for a good background with iPi - as they both must accomplish similar goals to be able to process the 3d space.

Would be interesting if iPi could use green screen tracking markers like the the 'how to place tracking markers' video here?

http://www.hollywoodcamerawork.us/vfx_sampleclips.html


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PostPosted: Wed Sep 02, 2009 2:25 pm 
iPi Soft

Joined: Tue Mar 31, 2009 9:13 pm
Posts: 804
Hi,

Thanks for questions. Greenlaw's comments actually contain good comments about clothing.

Our software is designed to work with clothing models that can be seen at the "Actor" tab. Clothing should be solid-color, and best choice is black short-sleeve T-shirt over bright (red or green) long-sleeve shirt, with blue jeans and black shoes.

Dark (ideally, black) color for torso is important because it helps to minimize the effect of shadows. Current generation of our technology is not very good at handling shadows.

It certainly helps having good contrast between hands and torso. So gloves can be a useful option for dark-skinned person. For light-skinned person, there is not much sense in wearing gloves.

Having high-contrast solid-color background like a greenscreen helps, but our software can work with cluttered background, as you can see from tutorial video.

Things like special yellow patches on knees would not really improve tracking.

An example of ideal clothing/background setup is presented in the video kindly published by our user Txesmi:

http://www.youtube.com/watch?v=G5b-NQEErfA

(captured animation for the above video: http://www.youtube.com/watch?v=rXR5tpk1SXc)

Current version of our software cannot do matchmoving so SythEyes and similar recommendations are not applicable here. Background tracking markers are not useful because the point of motion capture is capturing actor motion in 3D, while discarding original background. You can add any kind of background later when rendering motion in 3D. Binding your 3D coordinate system to real-world objects (ground plain, etc.) can be done during multi-camera calibration step, as explained in our calibration video tutorial.

As a practical advice, GAP (http://www.gap.com/browse/category.do?cid=5225) sells inexpensive clothes ideally suited for iPi Mocap, like simple solid-color shirts and straight fit jeans.


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PostPosted: Wed Sep 02, 2009 3:13 pm 

Joined: Mon Aug 03, 2009 1:34 pm
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Location: Los Angeles
Hi Michael,

Thanks for all this useful information! I think I'll be doing some clothes shopping tonight. :)

Greenlaw

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PostPosted: Wed Sep 02, 2009 6:09 pm 

Joined: Sun Aug 02, 2009 10:57 am
Posts: 107
Michael - I notice the actor in the video is wearing light shoes, yellow gloves and a black cap on his head.

Does the cap help?

Are we after primary colors for best contrast?


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PostPosted: Thu Sep 03, 2009 1:04 pm 

Joined: Mon Aug 03, 2009 1:34 pm
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Location: Los Angeles
I just got back from shopping/lunch at a local mall. At the mall, I was having a difficult time finding solid color, long sleeve shirts, when Old Navy came to the rescue. I bought a solid green and a solid red shirt for $10 each. Good deal! The fabric was a nice weight too, not thin and cheap. I bought the two shirts so I could choose one color if there was a conflict in background color with the other. I wish the green shirt was just a little brighter but I see no reason it wouldn't work well anyway. The red one was perfect, very bright and primary.

Curiously, Old Navy's website only has earthy and muted colors for long sleeved T's, so you'll have to go to an actual store to find this.

Greenlaw

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PostPosted: Sat Sep 05, 2009 11:48 am 
iPi Soft

Joined: Tue Mar 31, 2009 9:13 pm
Posts: 804
McWannabe wrote:
Michael - I notice the actor in the video is wearing light shoes, yellow gloves and a black cap on his head.

Does the cap help?

Are we after primary colors for best contrast?


Cap is not important. It may help if you want to hide long hair etc.

In that particular video, actor is not wearing gloves. In general, for light-skinned actor gloves are not very useful.

On green screen, light shoes seem to work just fine. In a more cluttered environment, we've been getting better results with black shoes.

And yes, primary colors are best for arms/legs/background.


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