Abstract
Integral imaging three-dimensional (3D) display provides quasi-continuous viewpoints within a certain viewing angle. A single human eye can obtain several parallax images corresponding to the viewpoints. In this paper, we studied the effect of viewpoints received by a single human eye on the accommodation response when viewing the 3D image reconstructed by integral imaging 3D display. We analyzed the viewpoints distribution of an integral imaging 3D display and the correspondence relationship between the viewpoints and pixels information in elemental image array. In the experiment, the accommodation responses of human eyes when viewing the 3D image with different viewpoint quantities and dimensions are measured. The statistical results reveal that the more viewpoints received by a single human eye, the closer the accommodation response of the 3D image is to that of the real target. This tendency is obvious when the viewpoint quantity reduces from 10 × 10 to 6 × 6. For situations of 2 × 2 and 1 × 1 viewpoint, the accommodation response is unstable and different from the real target. When considering the viewpoint dimensions, two-dimensional viewpoints can provide a more natural accommodation response than one-dimensional viewpoints do. For the one-dimensional viewpoint situation, the horizontal arranged viewpoints and vertical arranged viewpoints have no statistical discrepancy.
Highlights
When viewing a three-dimensional (3D) scene in the real world, we can obtain four kinds of physiological depth cues, which are binocular parallax, motional parallax, accommodation and convergence
This tendency is obvious when the viewpoint quantity reduces from 10 × 10 to 6 × 6
The statistical results reveal that the more viewpoints received by subject’s single eye, the closer the accommodation response is to the real target
Summary
When viewing a three-dimensional (3D) scene in the real world, we can obtain four kinds of physiological depth cues, which are binocular parallax, motional parallax, accommodation and convergence. Hiura et al analyzed the spatial resolution of integral imaging display at different depth and discussed the effect of 3D images’ resolution on accommodation response of human eyes [14]. They suggested that the accommodation responses of 3D images with higher resolution was closer to the real object. We researched on the effect of the viewpoints received by a single human eye on the accommodation response in integral imaging 3D display. We objectively tested the accommodation responses of human eyes when viewing 3D images with different viewpoint quantities and dimensions. The completion of this study would improve the visual comfort evaluation of integral imaging 3D display, and provide the theoretical guidance for developing a comfortable integral imaging 3D display
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