王庆月

摘 要： 虚拟现实技术发展迅速，已广泛应用于诸多领域，传统CAVE系统由于占地面积大、成本高、装调困难，难以推广和普及。因此，便携式CAVE系统的研究与开发对虚拟现实技术的普及与发展具有重要意义。针对此现状，根据便携式CAVE系统的特点，设计了目视光学系统，研究了投影图像的畸变矫正和随机点立体图的生成算法，搭建了基于目视光学系统调节的近距立体显示系统。设计并实施视觉舒适度的主观评估实验，探究近距显示引起的视疲劳程度与视差大小的关系，对基于目视光学系统调节的立体显示系统的视觉舒适度进行评估。该研究为便携式CAVE系统的研究提供了参考依据，对虚拟现实技术的发展和立体视觉舒适度的研究具有一定的实际意义。

关键词： 虚拟现实； 双目视差； 近距显示； 视觉舒适度

中图分类号： TN27?34； TM417 文献标识码： A 文章编号： 1004?373X（2017）01?0140?05

Abstract： The virtual reality technology developed rapidly， and has been widely used in many fields， but the traditional CAVE system is difficult to promote and popularize due to the large floor space， high cost and difficult installation and adjustment， therefore， the research and development of the portable CAVE system has great significance to the popularization and development of the virtual reality technology. According to the features of the portable CAVE system， the visual optical system was designed， the distortion correction of the projected image and random dot stereogram generation algorithm are studied， and the close range stereoscopic display system based on visual optical system adjustment was built. The subjective evaluation experiment of the visual comfort degree was designed and implemented to explore the relationship between the visual fatigue degree and parallax caused by the close range display. The visual comfort degree of the stereoscopic display system based on visual optical system was assessed. This technology provides a reference foundation for the study of the portable CAVE system， and has a certain practical significance to the development of the virtual reality technology and the study of the stereoscopic visual comfort degree.

Keywords： virtual reality； binocular disparity； close range display； visual comfort degree

0 引 言

近年來，虚拟现实技术发展迅速，已经被广泛应用于军事训练、医学实习、娱乐游戏等诸多领域。传统的虚拟现实显示系统虽然技术成熟，但存在一些弊端，因此便携式CAVE系统的概念应运而生。本文搭建了近距立体显示原型系统，通过主观实验，探究了便携式CAVE系统中双目视差的感知深度和单眼聚焦感知深度的差异，以及用户可接受的视觉舒适范围，对基于目视光学系统调节的立体显示系统的视觉舒适度进行评估。

1 立体视觉舒适度的评估方法

1.1 刺激方法的选择

为了避免视差的时间积累效应，实验采用双刺激连续分级法。……