FreeLSS version 1.23 is now available via the ATLAS 3D auto-update system.
Checkerboard Calibration
The major change this release is support for checkerboard based automatic calibration. This calibration method model handles many previously unhandled conditions including turntable center misalignment, turntable plane correction, the camera being positioned off center, the camera not being positioned completely horizontally, and much better calibration of the lasers. If the lasers are pointed even remotely close to the center of the turntable, the checkerboard calibration will do the rest. This should resolve the "double shell" issue some users were still experiencing.
The algorithm uses two printed checkerboards of differing sizes, one for the front of the calibration item and one for the back. The PDF file for the calibration pattern can be found at https://s3.amazonaws.com/atlas3d/calibrationPattern.pdf The 3D printable model for the calibration pattern is at https://s3.amazonaws.com/atlas3d/checke … n_item.stl. The PDF is also compatible with the calibration item that ships with the acrylic frames. These files are also available on Thingiverse https://www.thingiverse.com/thing:1280901 and linked on the Murobo printables page http://www.murobo.com/printables.html.
The manual calibration process has also been updated with integrated diagrams and a step by step procedure.
Please note that checkerboard calibration works on the Pi 1, but is much faster on the Pi 2 and Pi 3.
Start the process by clicking Calibrate like before.
A new descriptive page explains how to position the calibration item and where to retrieve the necessary files.
The progress page. The updates are currently pretty coarse but will let you know when the process is complete.
After a successful calibration.
The Setup page displays the calibration information. You can also access Manual Calibration from here.
The manual calibration process has also been updated.
Separation of Right and Left Results
The results of scans from the left and right lasers are now left in their respective files instead of merging them into one. This functionality may be integrated again at a later date but right now programs such as MeshLab do a much better job merging the scans than the Pi is currently capable of.