仿真假体视觉下的单目测距研究

赵瑛　张阳　郝大帅　王冬晖

摘  要： 为了研究假体佩戴者是否具有异常的立体视觉，影响目标定位，在现实场景中开展仿真假体视觉下单目测距研究。实验采用蒙眼测距方法，被试者佩戴头戴式显示器模拟在仿真假体单眼，仿真假体双眼以及在正常单眼情况观察判断放在地板上不同位置（3.51 m，4.92 m，6.33 m）的目标物体，通过蒙着眼睛轻快地走到他/她所判断的地方，记录并统计分析行走距离。实验结果发现，在三种观察条件下，正常单眼感知精度最高，仿真假体单眼最低。随着物体放置距离的增加，准确度也有细微下降。经统计分析发现，仿真假体单眼与正常单眼对距离判断没显著性差异，说明假体植入者能准确定位地面上的目标。

关键词： 仿真假体; 单目测距; 蒙眼测距; 目标定位; 距离感知; 实验分析

中图分类号： TN911?34                              文献标识码： A                     文章编号： 1004?373X（2020）20?0079?04

Monocular vision distance measurement under simulated prosthesis vision

ZHAO Ying， ZHANG Yang， HAO Dashuai， WANG Donghui

（Inner Mongolia Key Laboratory of Pattern Recognition and Intelligent Image Processing， School of Information Engineering，

Inner Mongolia University of Science and Technology， Baotou 014010， China）

Abstract： A research on monocular vision distance measurement under simulated prosthesis vision is performed in real scene to study whether prosthesis wearers have abnormal stereoscopic vision that affects target positioning. In the experiment， the subjects wore a head?mounted display to simulate the conditions of simulated prosthetic monocular， simulated prosthetic binoculus and normal human monocular， observe and judge the target objects placed on the floor at different positions （3.51 m， 4.92 m and 6.33 m） by means of the blindfold distance measurement method， and record and analyze the walking distance statistically by briskly walking with blindfold to where he/she judges. The experimental results show that， under the three observation conditions， the normal human monocular has the highest perception precision while the simulated prosthetic monocular is the lowest one. With the increasing of distance placing the object， the distance measurement accuracy is also reduced slightly. The statistical analysis results show that there is no significant difference in the distance measurement of the prosthetic monocular and the normal human monocular， which indicates that the visual prosthesis wearer can accurately locate the target on the ground.

Keywords： simulated prosthesis; monocular vision distance measurement; blindfold distance measurement; target location; distance perception; experimental analysis

0  引  言

人类对客观世界的认识主要来源于視觉，外界信息的70%以上是经由视觉系统传入大脑的，视觉通路上任一部分发生损伤或病变都会导致失明[1?2]。据世界卫生组织于2018年的报道，世界范围内约有13亿人患有某种形式的远视力或近视力损害。在近视力方面，有8.26亿人患有近视力损害。在远视力方面，大约1.885亿人患有轻度视力损害，2.17亿人中有中度至重度视力损害，近3 600万人失明[3]。失明是人类最严重的残疾之一，对患者的生活、学习和工作带来极大的不便和痛苦。

视觉假体作为当今眼科学界的重大前沿研究领域，是一种新的视觉功能修复手段，为盲人重见光明带来了希望[4?6]。……