Fig. 1. Optical imaging system with the liquid crystal lens

Fig. 2. Focus position of system and corresponding depth of field during the switching of liquid crystal lenses

Fig. 3. Image selection

Fig. 4. Structure of the LC lens

Fig. 5. Test path of liquid crystal lenses (Mach-Zehnder interferometer)

Fig. 6. Voltage scanning of the LC lens. (a) Fixed V₂ at 100 V and V₁ scanned from 5 V to 100 V in 5 V steps; (b) fixed V₁at 90 V and V₂scanned from 5 V to 100 V in 5 V steps

Fig. 7. Power and RMS aberration change with time during switching. (a) Relationship between power and time; (b) relationship between RMS aberration and time

Fig. 8. Fused images using complex-valued wavelets. (a) Focus on the background; (b) focus on the doll; (c) focus on the flowers; (d) fusion of multi-focus images Fig. 8(a)-(c); (e) focus on the background; (f) focus on the leaves; (g) focus on the flowers; (h) fusion of multi-focused images Fig. 8(e)-(g)

Fig. 9. Change of object distance and depth of field with power and time during the switching of liquid crystal lens. (a) Change of object distanceand depth of field with power of liquid crystal lens; (b) change of object distance and depth of field with time

Fig. 10. Frames focus on each object. (a) Focus on the ①; (b) focus on the ②; (c) focus on the ③; (d) focus on the ④

Fig. 11. Extended depth of field images. (a) Fusion of all images, S₁; (b) fusion of selected images, S₂

Fig. 12. Comparison of the same ROI for different images. (a) Background in the source image; (b) background in S₁; (c) background in S₂; (d) horse in the source image; (e) horse in S₁; (f) horse in S₂; (g) intermediate doll in the source image; (h) intermediate doll in S₁; (i) intermediate doll in S₂; (j) left doll in the source image; (k) left doll in S₁; (l) left doll in S₂

Fig. 13. Relationship between calculation time and number of images