Figure 11.

Field-of-view of the measurement system. The distance $L$ from the intersection point of two optical axes $N$ to the line between the optical points of the two cameras is designed as $L=300\mathrm{mm}$ and the angle of the two optical axes is designed as 38.6°. The depth of field should be kept within a suitable range ($280\mathrm{mm}\le L_2\le 350\mathrm{mm}$ in this study). The gray range is the effective view field of the system.