Fig. 1. Schematic drawing of the defocused burring using an object-space telecentric lens.

Fig. 2. Five probable locations of the focused image plane with respect to the image sensors.

Fig. 3. Detection of blur radius.

Fig. 4. Schematic drawing of single-lens dual-camera system.

Fig. 5. Illustration of the optical imaging parameters. (a) Preliminary lens. (b) Lens-prism group.

Fig. 6. Calibration of the systematic parameters using curve fitting.

Fig. 7. Images on the two cameras when focused on one of them. (a) Focused on IS2. (b) Focused on IS1.

Fig. 8. Five representative groups of images in simulation.

Fig. 9. Five representative groups of images in experiments for static particles.

Fig. 10. Result errors in experiments for static particles.

Fig. 11. Photo of experimental setup for measurement of moving bubbles.

Fig. 12. Couple of images of moving bubbles and reconstructed depth.