查看“扫描对齐”的源代码

To align multiple scans in PhoXi Control Application, it is useful to use marker patterns.

==Download patterns==
* [http://photoneo.com/files/markerPattern/Marker_Grid_Classic_Inverted_A4.pdf Marker pattern A4]
* [http://photoneo.com/files/markerPattern/Marker_Grid_Classic_Inverted_A3.pdf Marker pattern A3]
* [http://photoneo.com/files/markerPattern/Marker_Grid_A2.pdf Marker pattern A2]


Important note: Print the pattern at 100% scale.

==How to set coordinate space to Marker space==
# Open PhoXi Control App and connect to the scanner
# In the options pane on the left, check following options in group Coordinates:
#* MarkersSettings > InvertedMarkers
#* RecognizeMarkers
#* CoordinateSpace = MarkerSpace
# Put marker plate in the view of camera. Make sure camera sees at least four marker circles, then trigger the scan. Point cloud will be returned in coordinate system of marker plate.

==How to create the model of the object==
# Put the object above the marker plate and switch the coordinate space to Marker space. You can now move the scanner to different locations, it always returns the point cloud in the same coordinate system defined by marker plate.
# Make several scans from different angles to capture the object from all sides. Save each scan to PLY file.
# Open all PLY files in 3D point cloud viewer, e.g. Meshlab or Cloud Compare, crop the desired object, use some fine alignment algorithm (ICP), merge the point clouds and polygonize it to create a surface model.

==Issues==
; Image corrupted
: If the application does not return the scan and there is a message in the status bar "Image corrupted", make sure the angle between the scanner and marker plate is not too small and that the camera can see at least 4 marker circles.