Study On Direct Projection-type Integral Imaging Three-Dimensional Display Technology

Integral imaging, as a3D display technology with naked eye and real3D, has become a research hotspot in three-dimensional display field recently. Integral imaging has some advantages such as continuous viewing angle, low visual fatigue and without special glasses. But the quality of the reconstructed images integrated by the integral imaging is not very well on depth of field, viewing angle and range of imaging space. This limits the application of integral imaging.To solve the problems mentioned above. A new integral imaging system with direct projected is mentioned in this paper. The principle of this system is analyzed. The analyzed result shows that the quality of the reconstructed image is better than the one reconstructed by the conventional integral imaging system. Some methods for enhancing the viewing angle, depth-of-field and imaging range are shown as follow:1. The principle of the direct projection-type integral imaging display system is analyzed. The emergent angle and the field angle of the directional ray emitted from the point on the elemental images are analyzed. The principle of the integrated process is analyzed. The relationship between the parameters of the integral imaging display system and the quality of the reconstructed image is obtained. A new integral imaging system with negative lens array is proposed based on the relationship.2. Depth-of-field of integral imaging system enhanced. Two systems to enhance depth-of-field are proposed. One system is a direct projection-type integral imaging system with positive lens array. The depth-of-field is enhanced by controlling the emitted angle. The other system is a direct projection-type integral imaging system with negative lens array. Optical results show that the depth-of-field can be enhanced6.4times and17.5times by our proposed system.3. Viewing angle enhanced in integral imaging system. A new method is proposed to enhance the viewing angle of integral imaging system by spatial multiplexing. Spatial multiplexing is the special character of our direct projection-type integral imaging system. Multi-elemental images are projected to the location in the space. The multi-elemental images are used to enhance the viewing angle of integral imaging. Optical results show that the viewing angle can be enhanced to2.92times.4. Study on continuous imaging space of integral imaging system. A new display mode about real and virtual imaging on virtual mode is proposed to keep the continuous of integral imaging. This real and virtual imaging on virtual mode can reduce the gap between the real image and virtual image in conventional integral imaging system. This method makes the separated imaging space together. Optical results show that the gap in the proposed method is only45%of the one in the conventional integral imaging method.