1 Topic by Claghorn

  • Claghorn
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  • From: Delray Beach, FL
  • Registered: 2012-10-22
  • Posts: 730

Topic: dynamically adjust scanning speed

Just a thought for FreeLSS (if it doesn't already do it), the Matter & Form software's latest version came with a scanning mode where it could dynamically adjust the angle it turns between scans based on the distance of the bits it is scanning from the center of the turntable. As it rotates through a part that is small and near the center, it can rotate more between scans since the separation between scan lines will be smaller for objects near the center. As a wider piece of the part rotates into the scanning plane, it rotates through a smaller angle to try to keep the scan lines separated by about the same amount when the part sticks out more and is farther from the center. This really did seem to speed up most scans quite a bit (though, of course, it still seems terribly slow :-).

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2 Reply by pirvan (edited by pirvan 2015-06-07 14:31:31)

  • pirvan
  • pirvan
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  • Registered: 2013-03-27
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Re: dynamically adjust scanning speed

What kind of scanning speeds do you get, and at what resolutions?

The Atlas is capable of setting the camera at 4 resolutions (640x480, 1280x960, 1600x1200 or 2592x1944).  The lowest resolution is primarily for calibration, the middle 2 are for doing (relatively) quick, but good quality scans (it's also the so called default scanning mode), and the highest resolution is for intricate scans.

Then you can set the number  of steps per rotation, and whether you use one or both lasers to scan with.  Those are quite a few permutations, and the scanning speed will depend on that.

I usually scan at the highest resolution (5Mp, 2592x1944), and I use 1600 steps per revolution).  A single laser scan takes about 32-35 minutes, using both lasers doubles that up (about 60-65 minutes).

Of course lower resolution scans with less steps and with a single laser can be done in less than 5 minutes, but unless I'm scanning a featureless cylindrical object (like a vase), or doing a quick & dirty test, there's no reason of going that low.

BTW, the last version of FreeLSS (v1.6) has improved the scanning speeds dramatically.

To print or, 3D print, that is the question...
SD3 printer w/too many mods,  Printrbot Simple Maker Ed.,  FormLabs Form 1+
AnyCubic Photon, Shining 3D EinScan-S & Atlas 3D scanners...
...and too much time on my hands.

3 Reply by Claghorn

  • Claghorn
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  • From: Delray Beach, FL
  • Registered: 2012-10-22
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Re: dynamically adjust scanning speed

I don't actually know what resolution M&F scans with. They call the logitech webcam they use "HD" in their blurbs, but don't specifically say what the actual resolution is. I assume that means it is either 1280x720 or 1920x1080, but there aren't any controls to select the camera resolution. There are also no controls to select 1 or 2 lasers, it always uses both. What you can control is the angle it turns per scan and you can manually adjust the contrast settings, but their latest automagic settings to determine dynamically how to scan seem to work quite well, so I rarely select anything manually. The only control you are given for the automatic scans is if you are trying to capture color or not. It sounds like the Atlas is probably faster. I seem to recall it took about 45 minutes to scan the little blob of Play Doh I used to build a custom grip for working on small pieces:

http://home.comcast.net/~tomhorsley/har … -grip.html

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