Fig. 1. Schematic of vision-based linear displacement measurement system

Fig. 2. Influence of detection point topology on displacement measurement accuracy. (a) N=10; (b) N=20

Fig. 2. [in Chinese]

Fig. 3. Random motion trajectory

Fig. 4. Displacement measurement error under ideal condition

Fig. 5. Standard deviation of displacement measurement error at each position. (a) d=7 pixel, N=10; (b) d=2 pixel, N=10; (c) d=2 pixel, N=35

Fig. 6. Gray value of detection point and curve of measurement model

Fig. 7. Measurement results of proposed method and grating-scale displacement sensor

Fig. 8. Curve of measurement error