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	Visual search-based design and evaluation of screen magnifiers for older and visually impaired users
	Zhengxuan Zhao ; Rau, P.-L.P. ; Ting Zhang ; Salvendy, G.
	2010-10-12 ; 2010-10-12
关键词	Practical/ geriatrics handicapped aids human computer interaction image colour analysis text analysis/ visually impaired users screen magnifiers visual search-based design visual search-based evaluation visual search theory background color auditory output support text density/ C7850 Computer assistance for persons with handicaps C6180 User interfaces C5260B Computer vision and image processing techniques C7240 Information analysis and indexing
中文摘要	The purpose of this study was to achieve the following goals: apply some principles in visual search theory to design and develop a screen magnifier; evaluate if applying such features could increase user performance; and make some recommendations for designing a screen magnifier according to the findings of the study. In order to achieve these goals, a screen magnifier and an experimental tool to present stimulus words were developed. Seventy-two elderly Chinese adults took part in the experiment. The findings indicate that, for a screen magnifier, the overlapping mode is superior to the parallel mode; the yellow-highlighted background is superior to the non-highlighted background; for lower-density text, the dual output mode (visual + auditory) is superior to the mono output mode (visual only), while for the higher-density text, no difference was found between the mono and dual output modes. Based on the findings, several recommendations are made. The overlapping mode should be set as the default working mode. Yellow could be a reasonable choice of background color for a magnifier when the text is black. Auditory output support should be used, and users should be advised to use dual output when the text density is lower and mono output when the text density is higher. [All rights reserved Elsevier].
语种	英语
出版者	Academic Press ; UK
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/80659]
专题	清华大学
推荐引用方式 GB/T 7714	Zhengxuan Zhao,Rau, P.-L.P.,Ting Zhang,et al. Visual search-based design and evaluation of screen magnifiers for older and visually impaired users[J],2010, 2010.
APA	Zhengxuan Zhao,Rau, P.-L.P.,Ting Zhang,&Salvendy, G..(2010).Visual search-based design and evaluation of screen magnifiers for older and visually impaired users..
MLA	Zhengxuan Zhao,et al."Visual search-based design and evaluation of screen magnifiers for older and visually impaired users".(2010).

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