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Basic Study of an Assisting Method for Visual Information Perception among Low Vision Patients by Means of Gazing Information Feedback

注视信息反馈辅助低视力患者视觉信息感知方法的基础研究

基本信息

批准号：
16091202
负责人：
MIYAKAWA Michio
金额：
$ 7.1万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

In close collaboration with the researchers, two kinds of algorisms were developed to control the character size automatically. The implemented algorisms are as follows;(1) The character is magnified if the standard deviation of the gazing points for the past five frames exceeds a certain threshold revel. On the contrary, character size is reduced intentionally by closing the eyes for more than 30 seconds.(2) The character size is magnified if the subject makes his eyes thin more than the predetermined threshold level. The size is reduced in the same way as the first algorism.By using the news article printed on A4-sized sheet, validity of the first algorism was investigated for seven aged persons suffering from cataract and seven healthy students with low visual power. The results showed that both groups were able to read the document with the same speed by using the developed adaptive magnifier.The second algorism was evaluated by subject's effort of making his eyes thin when he felt difficulty of reading the document. The subjects are ten young students without suffering from eye diseases but with low eyesight and seven young students with visual disabilities. The average reading speed of students with visual disabilities was slower than that of subjects without visual disabilities. The difference may come from the usual status of opening of the eyes in the person with disabilitiesUsefulness of the adaptive viewer was confirmed experimentally. By combining some useful algorisms such as above, the developed viewer will work more appropriately.

在与研究人员的密切合作下，开发了两种算法来自动控制字符大小。实现的算法如下：(1)如果过去五帧的凝视点的标准偏差超过一定的阈值狂欢，则放大字符。相反，通过闭上眼睛超过30秒来故意减小字符大小。(2)如果受试者使他的眼睛变细超过预定的阈值水平，则放大字符大小。通过使用打印在4号纸上的新闻文章，对7名患有白内障的老年人和7名视力低下的健康学生进行了第一种算法的有效性调查。结果表明，两组受试者在使用所研制的自适应放大镜时都能以相同的速度阅读文档；第二种算法是通过受试者在阅读文档时将眼睛变细的努力来评估的。受试者为10名无眼病但视力低下的青年学生和7名视力残疾的青年学生。视力障碍学生的平均阅读速度慢于非视力障碍学生。这种差异可能来自于残疾人通常的眼睛张开状态。实验证实了适应性观察器的实用性。通过结合上述一些有用的算法，开发的查看器将更合适地工作。