Why is marker-based alignment in 3D scanners more accurate than texture-based alignment?

Marker-based alignment achieves higher precision than texture-based alignment primarily due to its stable positioning method and stronger resistance to interference.

• Marker-based alignment:

This method involves placing high-contrast fixed markers (such as reflective dots or specially coded points) on the object’s surface, providing the scanner with clear spatial references. These markers have precise and stable positions, ensuring highly accurate alignment of scanned data and minimizing cumulative errors.

• Texture-based alignment:

Texture-based alignment relies on matching visual features such as colors and patterns on the object’s surface. While it can capture rich detail, its performance degrades on smooth surfaces, uniformly colored areas, or repetitive textures. Additionally, environmental factors like lighting and reflections can affect texture stability, further reducing alignment accuracy.