Table 3.

Detection rates of different markers in different work distances

Distance	Chessboard vertices [6] (%)	Circular dot [5] (%)	Hybrid chessboard (ours) (%)	Hybrid dots (ours) (%)
Near (50–100 mm)	87.2	53.2	98.3	99.7
Middle (100–150 mm)	86.8	61.5	84.7	100
Far (150–200 mm)	79.5	75.7	11.0	99.8