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Table 1 Length of four board’s edges measured by EM sensor model 90 and Vernier caliper in mm

From: Automatic registration method using EM sensors in the IoT operating room

  Measured by surgical instrument Computed distance after stereo matching Error
#edge Mean length σ Mean length σ Absolute error Relative error
L1 75.32 0.18 75.12 0.31 0.18 ± 0.13 0.24% ± 0.17%
L2 60.43 0.21 60.25 0.44 0.19 ± 0.11 0.32% ± 0.18%
L3 75.51 0.16 75.21 0.39 0.21 ± 0.13 0.28% ± 0.17%
L4 60.36 0.19 60.16 0.48 0.16 ± 0.12 0.27% ± 0.20%