Fig. 1. Interactive system of finger and holographic image based on visual detection[31]

Fig. 2. Architecture of holographic projection system[35]

Fig. 3. Interactive integral imaging system[41]

Fig. 4. 3D touch system with direct-interaction[44]

Fig. 5. 3D touch display system with projector and holographic screen[45]

Fig. 6. 3D touch interface system embed with optical sensor array[48]