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          Thomas Megel's OpenScan Offers 10-Micron 3D Scanning on a Raspberry Pi
          and HQ Camera Module
          Low-cost 3D-scanning system offers sub-30-micron accuracy on a cheap
          Raspberry Pi Camera Module v2.1, or 10-micron on the HQ Camera.
          [15][15]Gareth HalfacreeFollowa few seconds ago • [16]3D Printing /
          Thomas Megel is aiming to bring down the cost and complexity of
          accurate 3D scanning — and to prove it, he's scanned a Raspberry Pi
          single-board computer using another Raspberry Pi single-board
          Megel founded OpenScan.eu with a mission to create a low-cost 3D
          scanner built around an Arduino-powered control unit and off-the-shelf
          smartphones and cameras. In its latest incarnation, though, the
          project has shifted focus with a new variant running atop a Raspberry
          Pi single-board computer and a Raspberry Pi Camera Module or HQ Camera
          "I am able to reach great accuracy with just a Raspberry Pi [and] Pi
          Camera [Module] v2.1," Megel explains, following the production of a
          demonstration video and 3D scan of a second Raspberry Pi. "I am
          currently testing an upcoming cloud processing feature, but it will
          always be possible to do the processing locally on a PC with Meshroom
          or similar software."
          The OpenScan system offers 10-micron accuracy when using a Raspberry
          Pi HQ Camera Module. (📹: Thomas Megel)
          "The [processing technique] is called photogrammetry and basically,
          the software is looking for common points in two images, matching
          those, do some math-magic and calculates camera intrinsics, camera
          positions and finally the coordinates for each point in space. I have
          implemented auto-scaling in the upcoming cloud processing, without the
          use of any markers."
          The sample scan provided by Megel to demonstrate the scanner's
          capabilities took, he claims, less than an hour of wall time and just
          four clicks of user interaction — though the processing requires the
          in-beta cloud platform or a more powerful host PC, with the Raspberry
          Pi unable to provide enough compute itself. In testing, the system has
          proven capable of sub-50-micron accuracy with the Raspberry Pi Camera
          Module v2.1 and around 10 microns with the Raspberry Pi HQ Camera
          More information is available [18]on Megel's Reddit thread and [19]on
          the project's GitHub repository. The model generated from the scanned
          Raspberry Pi, meanwhile, [20]can be found on Sketchfab.
          [21]3d scanning[22]scanning[23]3d modeling[24]camera[25]3d printing[15][15]Gareth
          HalfacreeFollowFreelance journalist, technical author, hacker,
          tinkerer, erstwhile sysadmin. For hire: freelance@halfacree.co.uk.
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