1. INTRODUCTION OF THREE-DIMENSIONAL DISPLAY
Information in the real world could be acquired by humans through a variety of ways. Among them, more than 70% of information is obtained by visual perception. Through visual information, humans could perceive the three-dimensional (3D) layout of objects in the real world. Human perception of the 3D information could be achieved through pseudo 3D effects, binocular parallax, motion parallax, monocular focus effect, and binocular convergence effect. Pseudo 3D effects, such as affine, texture, and shadow, contain no binocular depth information about the displayed object. They could only deceive the human brain to produce psychological 3D feelings. Binocular parallax refers to the difference between two images for the left and the right eyes, respectively. These two slightly different images are fused by the brain, and then 3D immersion could be obtained. Motion parallax is the movement amounts of objects at different depths that are not equal when a person observes a 3D scene while moving. The monocular focusing effect indicates the adjustment of the lens in human eye for a clearer viewing effect of objects at different depths. The binocular convergence effect means the rotation of the optical axes of two eyes. The intersection of the optical axes will converge at the center of the target object at a specific depth.
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