Method

RMSE (mm)

NRMSE

MAE (mm)

Correlation coefficient

KLT Optical Flow

0.212

0.419

0.175

0.768

Farneback Optical Flow

0.074

0.146

0.058

0.940

SURF Feature Point Matching

0.140

0.276

0.110

0.778

Ours

0.046

0.090

0.037

0.960