Fig. 1. Free fall of a small ball photographed by two different types of cameras.

Fig. 2. Four-mirror-based monocular stereo vision. (a) Event camera and four-mirror adaptor. (b) Light paths for four-mirror-based monocular stereo vision.

Fig. 3. Principle of stereo vision 3D reconstruction. (a) Geometric relationships in stereo visual 3D reconstruction. P is a point in the world coordinate system, and P_l and P_r represent the pixel coordinates of the P point projected to the left and right views, respectively. (b) Image of a calibration board taken by the monocular stereo vision system in gray-scale mode.

Fig. 4. Trajectory and velocity in 3D of a small steel ball hitting the wall and rebounding. (a) Experimental setup and size of the steel ball (8 mm; the steel ball was painted white because the background plate is black). (b) The 3D trajectory and velocity.

Fig. 5. Experimental setup for vibration measurement of rotating discs. (a) Experimental setup. (b) The marker dot.

Fig. 6. Events obtained in rotating disc vibration measurement experiments. (a) Events acquired by the left virtual camera. (b) Events acquired by the right virtual camera.

Fig. 7. Results of the rotating disc vibration measurement experiments. (a) 3D trajectory and velocity of the marker point during the rotation. (b) Off-plane displacement of the marker point. (c) Spectral analysis of off-plane displacement of the marker points.