利用3D快门眼镜测量立体视锐度

发布时间：2018-01-17 03:11

本文关键词：利用3D快门眼镜测量立体视锐度　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：立体视觉是双眼辨别物体深度、距离、凹凸的能力,是双眼视觉完善的重要标志。评估立体视觉采用的是立体视锐度,其大小是通过测量双眼所能觉察的最小视差来确定,视差的阈值越小,表明立体视锐度越好。测量立体视锐度的传统设备是Howard-Dolman立体视力测定仪,但此方法繁琐,不适合常规应用。常用的测量方式是基于偏振光镜片或红绿滤色片的立体图检测,这些方法测量方式虽然简单,但存在精度差、易出现误差、测量范围有限等问题。本研究建立了基于3D快门眼镜技术的计算机辅助立体视锐度测量系统,进行了以下三部分工作:(1)采用定距测量和变距测量两种系统,评估不同大小、形状以及类型的视标对立体视锐度测量结果的影响。(2)评估基于计算机显示的立体视锐度测量的屏幕对比度容许范围,判断对比度大小对测量结果的影响。(3)探索环境亮度对计算机辅助立体视锐度测量的影响。受试者30名,年龄20-28岁。采用的设备包括3D笔记本(ASUS G750Y47JX)和3D快门眼镜、激光测距仪、色彩校正仪、屏幕亮度计和照度计测量等。程序由C#语言编写。本研究测试包括(1)在定距测量系统中,测试距离设定为4.1m,设计了36套测量方案,包含了三种形状(“C”,“E”,“□”)、交叉和非交叉视差,以及代表0.5、0.4、0.3、0.2、0.1和0log MAR视力大小的视标。变距测量系统中,采用包含三种形状的交叉和非交叉立体视标共6套方案。(2)采用变距测量系统,对灰度对比度分别为100%,90%,80%,70%,60%,50%,40%,30%,24%,20%,18%,16%,14%,12%,10%,8%,6%,4%和2%的19张测试页进行测量。(3)采用变距测量系统,分别在环境亮度不超过3lux,以及约150lux、800lux和10000lux的情况下进行测试。所有数据经PASW Statistic 18.0软件处理。结果显示:(1)定距测量系统中,受试者均完成了所有36套测试。采用Kruskal-Wallis test,各组间均未见统计学差异(Chi-square=29.844,P=0.715)。即视标的大小(0.5到0 log MAR)、视标的形状(“C”,“E”,“□”),和视差的类型(交叉或非交叉)均不影响立体视锐度测量结果。变距测量系统研究发现视标的形状和类型均不影响立体视锐度测量结果。(2)19组灰度对比度间存在统计学差异(单因素方差分析,F=39.750,P0.001)。Bonferroni测验显示在前12个组间(灰度对比度100% 16%,实际对比度99.8%-36.4%)并无显著差异。(3)环境亮度分析结果显示,4个组的立体视锐度值并无显著差异(单因素方差分析,F=0.773,P=0.512)采用3D快门眼镜进行立体视锐度的测量,方便而有效。视标的大小、形状,以及视差类型对于立体视觉测量并无显著影响;图像对比度和环境亮度对于正常状态下的立体视锐度检查也无显著影响。3D笔记本立体视锐度测量系统因其便携、灵活等特点,将逐渐展现出其在临床与科研中的应用价值。
[Abstract]:Stereo vision is the ability of binocular vision to distinguish object depth, distance and concavity, which is an important sign of binocular visual perfection. Stereoscopic vision is evaluated by stereoscopic acuity. Its size is determined by measuring the minimum parallax that can be detected by both eyes, and the threshold of parallax is smaller. It shows that the better the stereoscopic acuity, the traditional equipment for measuring stereoscopic acuity is Howard-Dolman stereoscopic visual acuity meter, but this method is cumbersome. It is not suitable for conventional application. The commonly used measurement methods are based on stereoscopic detection of polarizing lenses or red and green filters. Although these methods are simple, they have poor accuracy and are prone to errors. Based on 3D shutter glasses, a computer-aided stereoscopic acuity measurement system is established. In this paper, the following three parts of work are carried out: one is to evaluate the different sizes by using the two systems of fixed distance measurement and variable distance measurement. Effect of shapes and types of visual markers on the results of stereoscopic acuity measurements.) evaluating the screen contrast allowable range of stereoscopic acuity measurements based on computer display. To determine the effect of contrast on the measurement results. (3) to explore the effect of ambient brightness on computer-aided stereoscopic acuity measurement. Ages 20-28. The equipment includes 3D notebook ASUS G750Y47JX) and 3D shutter glasses, laser rangefinder, and color corrector. The program is written by C # language. This research test includes 1) in the distance measurement system, the test distance is set to 4.1 m, and 36 sets of measurement schemes are designed. It contains three shapes ("C", "E", "-"), cross and non-cross parallax, and represents 0.5 / 0. 4 / 0.30.2. 0. 1 and 0. 1 log MAR visual acuity. In the variable distance measurement system, 6 sets of cross and non-cross stereoscopic markers including three shapes were adopted. The ratio of the gray levels is 100 and 90, respectively, and there are about 60, 50, 50, and 50, and 40, and 40, 30, 24, 24, and 20, 20, 20, 20, 20, 20, 20, 20, 20. 2% and 2% of the 19 test pages were measured using a variable distance measurement system, which did not exceed 3lux in ambient brightness, and about 150lux, respectively. In the case of 800lux and 10000lux, all the data were processed by PASW Statistic 18.0 software. All the subjects completed all 36 sets of tests. No statistical difference was found among the three groups using Kruskal-Wallis test (Chi-square 29.844). The size of the target is 0. 5 to 0 log mars, depending on the shape of the marker ("C", "E", "-"). The results of stereoscopic acuity measurement were not affected by the type of parallax (crossover or non-crossover). The study of variable distance measurement system found that the shape and type of visual marker did not affect the result of stereoscopic acuity measurement. There was statistical difference in gray contrast between 19 groups (single factor analysis of variance). The results of FN 39.750g P0.001U. Bonferroni test were found in the first 12 groups (gray contrast 100% and 16%). There was no significant difference in the actual contrast between 99.8- 36.4) the results of ambient luminance analysis showed that there was no significant difference in stereoscopic acuity of the four groups (single factor ANOVA). The 3D shutter glasses are used to measure the stereoscopic acuity, which is convenient and effective. Parallax type had no significant effect on stereoscopic vision measurement. Image contrast and ambient brightness have no significant effect on stereo acuity measurement under normal condition. 3D notebook stereo acuity measurement system is portable and flexible. It will gradually show its application value in clinical and scientific research.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：R770.4

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