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DAVID-Laserscanner Forum • View topic - building a motorized scanner
Dear DAVID Community,

As you are probably aware, the entire DAVID company, team and product range has been integrated into HP Inc.
This forum is now read-only. Relevant content has been migrated to HP and merged into HP's Support Forums on November 1, 2016.

To start new discussions for 3D Scanning, please register and post your new topic at the HP Support Forums

building a motorized scanner

building a motorized scanner

Postby jbeale » Sat Aug 18, 2007 7:56 am

Attachments
DCM-276.mov
video showing gear train inside All Electronics DCM-276 motor with output shaft (bottom black gear) at 0.2 RPM
(815.79 KiB) Downloaded 1536 times
scan1.mov
slow laser sweep across desk
(471.95 KiB) Downloaded 1411 times
jbeale
 
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actually about 0.33 rpm

Postby jbeale » Sat Aug 18, 2007 4:08 pm

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Postby WalterMo » Sat Aug 18, 2007 9:01 pm

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Postby MagWeb » Sat Aug 18, 2007 10:28 pm

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another plea for unweighted cumulative average

Postby jbeale » Mon Aug 20, 2007 8:59 pm

I made a "barn-door" type mount for my laser with two pieces of wood, a hinge, and all-thread shaft + nut. This is a common camera mount for amateur astronomy, for example http://www.zodiaclight.com/equipment/barnDoor.htm

I didn't calculate it out before hand -oops- so I now realize with my current motor drive, my laser sweep rate is from 2 deg/min adjustable down to 0.12 deg/minute. The slowest rate is about half the speed that the sun moves across the sky! The fastest is still only 3 rev per hour. I need a faster motor.

But meanwhile, it would be *really nice* if DAVID allowed unweighted averaging, so at least I would get the full noise-averaging benefit of the slow scan. As it is now, when the latest sweep forms 70% of the total, there is very little cumulative averaging (= noise reduction) over time. I think adding this as an option is a fairly easy software change, yes?

if Sample(n) is the nth sample you have acquired and Data is the saved result, then

Old way: New_Data = 0.3 * Data + 0.7 * Sample(n)
New way: New_Data = ((n-1)/n) * Data + (1/n) * Sample(n)

the only new memory requirement is an integer array of the "n" values for each image pixel, which is the number of times that pixel has been sampled before.

As a side-note, the ability to display or export that "n" value array might be of some interest, as well.
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spinning mirror scanner

Postby jbeale » Sun Sep 02, 2007 11:19 pm

Attachments
laser-scanner.jpg
spinning mirror type laser scanner on tilting platform
laser-line-arm.jpg
laser line from spinning mirror scanner on my arm & hand
jbeale
 
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results from rotating mirror scanner

Postby jbeale » Mon Sep 03, 2007 3:10 am

Attachments
water-pitcher.jpg
one view of a 8" plastic water pitcher, using rotating-mirror scanner
jbeale
 
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Postby Bongobat » Tue Sep 04, 2007 1:07 am

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Postby jbeale » Wed Sep 05, 2007 9:18 pm

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Stay with it!

Postby Bongobat » Tue Sep 11, 2007 8:06 am

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Re: building a motorized scanner

Postby jonb2000 » Wed May 06, 2009 4:46 pm

Hi jbeale,

I recently bought the gear motor you suggested in your last e-mail but I got the motor without the power source.
Can you please let me know where can I get the power source for the motor.

( gearmotor from www.allelectronics.com for only $9. http://www.allelectronics.com/cgi-bin/i ... 2VDC_.html)

Thanks,

jonb2000
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Re: building a motorized scanner

Postby Khalid Khattak » Wed May 06, 2009 4:57 pm

I think your laser setup is well organized..i liked it :) .. As far as the quality scan is concerned i am still after it.. i will be happy in the day when i scan a coin?... well... can we scan the coin with good details with the help of Logitech 9000 and a focusable red laser????
PC: Dell Inspiron i3, 2.27GHz,4GB RAM,64 bit windows 7
CAMERA:
David CCD Mono USB
LASER:
David 5mW Green line laser
PROJECTOR:
3D LED Mini Projector 250lumens, Native 1024x600
[b]http://free3dscans.blogspot.com/
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