Posted: Tue May 22, 2007 1:50 am Post subject: Close range high accuracy scanning systems
Hi Guys,
We've been looking at various systems for some time now and have come across quite a few, in particular the Mephisto scanning engine, Flexscan 3D and the Handyscan.
I'm interested to know if anyone has been able to use any of these systems successfully outdoors, we need a very high accuracy system for scanning various objects outside, right now we need something for stone work on building facades but we are also looking at other projects and all are outside.
You should check Leica HDS 3600 Scanstation.
We made building facades with it and it works great. It can scan up to 200-300 m, it has about 4-5 mm error, so for great scale and building facades is perfect. It's not good for small objects, which need really high dense point clouds, with 3-4 microns errors.
Its the detailed stone work that we need better results on, i've actually been trying combined surveys using the 3000's for the bulk of the facade and then scanning any detailed stone work (this is for reproduction work) with close range scanners.
You are correct in your statement about the 3000, its a great scanner for building facades, its just not accurate enough for the detailed high accuracy stuff.
well, what settings did you used relating distance and space between points taken???? if you take points at 0.5 cm apart, isn't that accurate enough???
This project has now been completed and we used the Mephisto scanner in the end, however i'm sure that the handyscan would have been the better tool for the job due to the lack of any requirement for registration as its done on the fly.
For architectural detail work the ScanArm from FARO is good since it is connected to a portable CMM, but if you need to do onsite measurement high up then you need something independent since stability is a problem.
You need something quick, high resolution and does it need to capture color too??
White-light systems are a good choice but in daylight may wreak havoc for you. The Konica-Minolta system would be my first choice. It is quick but you have to deal with using cloud registration and limited field of view, but it's not so bad. Also, you can use independent photogrammetry targets for registration too eliminating the cloud-to-cloud headache.
Be aware though you need of course surfacing software like Geomagic or Polyworks, etc... that is a whole 'nother thread. _________________ Ed Oliveras
3SPACE, Inc.
Measurement Specialists
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