Abstract
We proposed a glasses-free randot stereotest using a multiview display system. We designed a four-view parallax barrier system and proposed the use of a random-dot multigram as a set of view images for the glasses-free randot stereotest. The glasses-free randot stereotest can be used to verify the effect of glasses in a stereopsis experience. Furthermore, the proposed system is convertible between two-view and four-view structures so that the motion parallax effect could be verified within the system. We discussed the design principles and the method used to generate images in detail and implemented a glasses-free randot stereotest system with a liquid crystal display panel and a customized parallax barrier. We also developed graphical user interfaces and a method for their calibration for practical usage. We performed experiments with five adult subjects with normal vision. The experimental results show that the proposed system provides a stereopsis experience to the subjects and is consistent with the glasses-type randot stereotest and the Frisby–Davis test. The implemented system is free from monocular cues and provides binocular disparity only. The crosstalk of the system is about 6.42% for four-view and 4.17% for two-view, the time required for one measurement is less than 20 s, and the minimum angular disparity that the system can provide is about 23 arc sec.
Highlights
Stereoacuity is defined as the smallest horizontal disparity required to provoke a perception of depth or stereopsis.[1,2,3,4,5,6,7,8] Figure 1 shows the geometry of the angular disparity in an object space.[1]
The subjective test shows that the concordance between the conventional randot stereotest and the proposed randot stereotest using a glasses-type 3-D display system increases with the AC conflict reduction method.[5]
We proposed here a glasses-free randot stereotest using a multiview display system
Summary
Stereoacuity is defined as the smallest horizontal disparity required to provoke a perception of depth or stereopsis.[1,2,3,4,5,6,7,8] Figure 1 shows the geometry of the angular disparity in an object space.[1] When object A and object B are located at different distances, the convergence angles between the two eyes induced by the binocular disparity become different. The difference between the two convergence angles α and β is defined as angular disparity η. Stereoacuity is expressed as the smallest angular disparity η that a patient can discriminate.
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