Fig. 1. Zoom modules of the holographic zoom system.

Fig. 2. Structure of the liquid lens.

Fig. 3. Structure of the color holographic zoom system.

Fig. 4. Relationship between the voltage and focal length of the liquid lens.

Fig. 5. Process of the holograms: (a) original object; (b) hologram of the red color scene; (c) hologram of the digital lens; (d) combined hologram.

Fig. 6. Reconstructed results of the monochrome scenes: (a) red scene; (b) green scene; (c) blue scene.

Fig. 7. Results of the color holographic zoom system: (a) M=1.33; (b) M=1.4; (c) M=1.5; (d) M=1.75; (e) M=2.

Fig. 8. Results of the color holographic zoom system: (a) M=1.33; (b) M=1.5; (c) M=1.7.

Fig. 9. Relationship between the digital lens and the liquid lens.

Fig. 10. Magnification of the holographic zoom system.