Glasses-free randot stereotest

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.

A New Distance Stereotest by Autostereoscopic Display Using an Eye-Tracking Method

“…Glasses-free 3D displays give us the opportunity to experience stereotests in a more natural and free state. Jonghyun Kim ( Kim et al, 2015 ) made an encouraging attempt at designing such a system by designing a parallax barrier system for a glasses-free random-dot stereotest, which had four or two viewpoints with an interval of 31.25 mm (half of the interocular distance) and an observation distance of 1.38 m. The low crosstalk (6.42% for four viewpoints and 4.17% for two) at the ideal viewing position ensured an ample stereo effect. However, the viewer’s eyes need to be fixed at a certain point.…”

“…It keeps the crosstalk at approximately 6% in the continuous viewing zones of about ±26° ( Xu et al, 2019b ) (calculation equation in Supplementary Appendix SA). Its crosstalk is consistent with Jonghyun Kim’s parallax barrier system ( Kim et al, 2015 ), while its viewing angle with acceptable crosstalk is significantly expanded compared to traditional autostereoscopic display systems (comparison data of viewing angles from different systems in Supplementary Appendix SB). In addition, it maintains the original physical resolution and brightness by using a spatial-sequential-multiplexed resolution ( Xu et al, 2019b ).…”

“…In 2015, Jonghyun Kim presented a glasses-free random-dot stereotest ( Kim et al, 2015 ) using a multi-view display system (observation distance = 1.38 m) by placing a four-view parallax barrier system in front of a display panel to show random-dot multigrams that were generated. This eliminated the negative effects of 3D glasses on stereoacuity evaluation.…”

Stereoacuity measurement using a phoropter combined with two 4K smartphones

“…With the development of computer‐aided 3D technology, mature 3D techniques such as polarisation technology or active shutter glasses technology have been used to detect the threshold of stereopsis. The use of polarisation glasses or shutter glasses may affect binocular stereopsis, and their use is different from the actual binocular fusion experience in the real world . Based on previous studies, Kim et al designed an improved four‐view parallax barrier system for the random dot stereotest without the need to wear glasses.…”

“…The use of polarisation glasses or shutter glasses may affect binocular stereopsis, and their use is different from the actual binocular fusion experience in the real world . Based on previous studies, Kim et al designed an improved four‐view parallax barrier system for the random dot stereotest without the need to wear glasses. However, the autostereoscopic system also has its limitations.…”