Abstract
Autostereoscopic displays employing lenticular sheets have broad applications due to the high transmittance of lenticular sheet. However, due to the restriction of lens array design and processing, the imperfect image of lenses can reduce the quality experience of autostereoscopic displays. Stereo depth is one of the qualities of experience parameters, which relates to the three-dimensional effect. Therefore, to quantize the reduction effect of stereo depth caused by lens aberration is of great value. In this paper, we implement a binocular model of an autostereoscopic display system with lens array to analyze this effect, which is different from the previously used monocular model. Two receivers in the positions of viewer’s eyes are set on the viewing plane, and a similar factor is defined to evaluate the difference of light spots perceived by the two receivers. When the similar factor exceeds a certain value, the two spots cannot be fused in the brain, thus restricting the perceived stereo depth. Both in simulation and experiment, a sudden decrease of the similar factor is observed when the viewing angle exceeds 16°. In the subjective experiment, all the sixteen viewers feel a sudden decrease of stereo depth when the viewing angle exceeds 16°, which further verifies the validity of the model. The model and the method are significant for improving the viewing experience of autostereoscopic displays and providing a guidance on autostereoscopic display system designing.
Highlights
Three-dimensional (3D) display provides vivid viewing experiences and is expected to be widely used in areas such as entertainment, advertising, national defense, and scientific research [1,2]
We present a new method based on human vision to evaluate the stereo depth (SD) reduction effect caused by lens aberration for lenticular based autostereoscopic display system
Compared to the monocular models, our model simulates the true function of lenslets in autostereoscopic display systems, and the 3D fusion in human vision
Summary
Three-dimensional (3D) display provides vivid viewing experiences and is expected to be widely used in areas such as entertainment, advertising, national defense, and scientific research [1,2]. Theoretically, the perceived maximum stereo depth (SD) performed by an AD is limited by the finite small pixel pitch of the display screen It is worse for lenticular-based ADs, most of them cannot. A stereo point, represented by one pixel, was imaged by a lenslet in the lenticular sheet with aberration at the expected 3D point position. In this paper, based on the principle of binocular vision, we implement a theoretical model to quantize the reduction effect of lens aberration to SD in ADs. A stereo pair of spots, represented by two pixels in the display panel and emits light rays through two different lenslets, and the two light beams reach the viewing plane and form two light spots with an interpupillary distance.
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