Reading Pixelized Paragraphs of Chinese Characters Using Simulated   Prosthetic Vision

doi:10.1167/iovs.10-5293

CORC > 北京大学 > 工学院

	Reading Pixelized Paragraphs of Chinese Characters Using Simulated Prosthetic Vision
	Zhao, Ying ; Lu, Yanyu ; Zhao, Ji ; Wang, Kaihu ; Ren, Qiushi ; Wu, Kaijie ; Chai, Xinyu
刊名	investigative ophthalmology visual science
	2011
关键词	VISUAL PROSTHESIS ARTIFICIAL VISION ELECTRICAL-STIMULATION RETINAL PROSTHESIS PSYCHOPHYSICS RECOGNITION PHOSPHENES CONTRAST CORTEX BLIND
DOI	10.1167/iovs.10-5293
英文摘要	PURPOSE. Visual prostheses offer a possibility of restoring useful reading ability to the blind. The psychophysics of simulating reading with a prosthesis using pixelized text has attracted attention recently. This study was an examination of the reading accuracy and efficiency of pixelized Chinese paragraphs after different parameters were altered. METHODS. Forty native Chinese speakers with normal or corrected visual acuity (20/20) participated in four experiments. Reading accuracy and efficiency were measured after changing the character resolution, character size, pixel dropout percentage, number of gray levels, and luminance. RESULTS. A 5 degrees x 5 degrees character appeared to be the optimal size necessary for accurate pixelized reading. Reading accuracy close to 100% could be achieved with 10 x 10 pixels/character and similar to 60% with a 6 x 6 pixel resolution. Pixel dropout adversely affected accuracy, and paragraphs with a 50% dropout were unreadable. Luminance had little effect; however, the number of gray levels significantly affected reading performance. Paragraph reading was at least 5% more accurate at each resolution than was the accuracy of Chinese character recognition. CONCLUSIONS. Character size and resolution, pixel dropout, and the number of gray levels clearly affected the reading performance of pixelized Chinese paragraphs. Compared with pixelized character recognition, pixelized Chinese paragraph reading achieved higher accuracy; thus, optimal Chinese reading performance may require prostheses with more electrodes (1000) than are required to read paragraphs in the Latin alphabet (500). (Invest Ophthalmol Vis Sci. 2011;52:5987-5994) DOI: 10.1167/iovs.10-5293; Ophthalmology; SCI(E); 5; ARTICLE; 8; 5987-5994; 52
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/394558]
专题	工学院
推荐引用方式 GB/T 7714	Zhao, Ying,Lu, Yanyu,Zhao, Ji,et al. Reading Pixelized Paragraphs of Chinese Characters Using Simulated Prosthetic Vision[J]. investigative ophthalmology visual science,2011.
APA	Zhao, Ying.,Lu, Yanyu.,Zhao, Ji.,Wang, Kaihu.,Ren, Qiushi.,...&Chai, Xinyu.(2011).Reading Pixelized Paragraphs of Chinese Characters Using Simulated Prosthetic Vision.investigative ophthalmology visual science.
MLA	Zhao, Ying,et al."Reading Pixelized Paragraphs of Chinese Characters Using Simulated Prosthetic Vision".investigative ophthalmology visual science (2011).