1. Ensure the plane of the reflective marker and each feature of the item being scanned are at a distance of no more than 25 mm. This will better guarantee the point cloud accuracy of the 3D reconstruction of the item’s features. Note: A single scan format can be recognized as a plane with no fewer than 4 reflective markers.
2. Try to ensure that the 3D scanner can recognize the reflective markers perpendicularly from each angle as far as possible. The more accurately the scanner identifies the center of the reflective marker, the higher the splicing accuracy will be. Therefore, place the reflective markers as dispersedly as possible across all dimensions and heights of the item being scanned. If the markers are only placed on a turntable, the scanning accuracy and data quality may be affected when the item’s height exceeds 25 mm.
3. Avoid placing reflective markers on curved surfaces. When the markers bend, they will appear elliptical to the camera, leading to inaccurate center calculation and reduced identification and splicing accuracy. If placing markers on curved surfaces is necessary, try to ensure the markers do not deform and gently adhere only the center of the marker to the curved surface.
How to improve 3D scanning accuracy in reflective marker splicing mode (Landmark)?
5. An appropriate 3D scanning distance is also conducive to improving accuracy. In the optimal scanning distance range, scan a little farther away, which can recognize more reflective markers, thus improving the accuracy.
6. Diffuse reflective surfaces help ensure the quality of the 3D reconstruction point cloud. The reflection/refraction of laser/scattering on the object’s surface can increase reconstruction errors. For example, the reconstructed sphere diameter of a translucent sphere may be smaller than the original one. Therefore, for highly reflective, specular, transparent, translucent, black and challenging surfaces, applying a contrast enhancer can help ensure the quality of the 3D point cloud reconstruction.
Summary of Precautions for Pasting reflective markers:
1. The more irregular the reflective marker, the higher the accuracy.
2. Reflective markers should be scattered and placed on all directions and heights of the items to be scanned.
3. The distance between two reflective markers should be 4-8 cm for optimal accuracy.
4. The distance between the plane of the reflective marker and each feature of the item being scanned should be no more than 25 mm.
5. Reflective markers should not be placed on important geometric features or edges to prevent data loss. Instead, place them on large surfaces/planes whenever possible.
Note: If the 3D scanning accuracy requirement is not stringent, the above guidelines can be followed selectively.