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DAVID-Laserscanner Forum • View topic - how to scan black hair by structured light?
Dear DAVID Community,

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how to scan black hair by structured light?

Problems, solutions and discussion about scanning with a video projector and stripe patterns.

how to scan black hair by structured light?

Postby meng » Thu Aug 13, 2009 9:24 pm

Currently, I am working on a realtime 3D structured light system (see http://vis.uky.edu/~realtime3d/ ). The frame rate achieves 120 fps for acquisition and data processing. Everything works fine except that I want to scan black hair... Structured light does not work well on black object. So, does anyone have any idea how to overcome this problem? Thanks!
meng
 
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Re: how to scan black hair by structured light?

Postby MagWeb » Thu Aug 13, 2009 10:10 pm

Hi,

forgive that old joke:
Wait till the hair gets grey..... :lol: :mrgreen: :lol:

Maybe some kick - never tried - only a thought:

Black means: not reflecting wavelengths visible to the human eye.... maybe another instrument may catch reflections from such a surface?...maybe a projector could send such wavelengths?

Gunter
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Re: how to scan black hair by structured light?

Postby meng » Sat Aug 15, 2009 12:46 am

Yes, pure black will fail. But I am think, since some light is still getting from the hair, whether increasing the exposure time of camera will be helpful. Did anyone try it?
meng
 
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Re: how to scan black hair by structured light?

Postby KopkoH » Sun Aug 16, 2009 4:34 am

Do you have plan to published your software on site? It would be nice to look :-)
KopkoH
 
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Re: how to scan black hair by structured light?

Postby jantje » Sun Aug 16, 2009 1:57 pm

Meng
I did some tests with my RIG to do some face scanning. As I have really dark black hair there is simply no laser refection (I knew that from previous scans). Moreover you have the problem of the thickness of hair. Simply put: thin curly hair is to unstructured to be scanned this way.
This is why I did 2 things to get my hair scanned.
1) Use wax to make my hair look solid. (ordinary wax to change your hair style)
2) Use a hair spray on top of the wax to make my hair grey (I used grey as I had it lying around.)

The spray is a spray used in theater to dye hair very temporary. Washing and it is gone. if you look for "theater color spray" in google you'll find plenty of places to buy it from.

Hope this helps you out.
Jan
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Re: how to scan black hair by structured light?

Postby meng » Mon Aug 17, 2009 12:55 am

Last edited by meng on Mon Aug 17, 2009 12:57 am, edited 1 time in total.
meng
 
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Re: how to scan black hair by structured light?

Postby meng » Mon Aug 17, 2009 12:56 am

meng
 
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Re: 12 structured light files ?

Postby Angus » Wed Aug 19, 2009 9:12 am

Hi,

I'm a newbie who can't find the 12 structured light files mentioned, can anyone please help me? I don't see an EXPERIMENTAL folder with structured light files on my new [color=#80FF00]David USB. The link David_2_4_1_CLA.zip which used to lead to the structured light files, doesn't. Sorry to butt in here but it was the only active thread that mentioned structured light.

Thanks,
AngusJohnMcLachlan@yahoo.com
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Re: how to scan black hair by structured light?

Postby MagWeb » Wed Aug 19, 2009 10:40 am

MagWeb
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