Abstract:
To investigate the effects of phosphene array irregularity in visual prostheses, a model of phosphenes' positional uncertainty was devised and two different image down-sa...Show MoreMetadata
Abstract:
To investigate the effects of phosphene array irregularity in visual prostheses, a model of phosphenes' positional uncertainty was devised and two different image down-sampling schemes, adapting and non-adapting, were proposed. Based on a simulation system, visual acuity tests were given to four normally sighted subjects under seven degrees of array irregularity and the two down-sampling schemes. With the irregularity index increasing from 0 to 0.6, visual acuity fell over a range of 0.22 logMAR (logarithm of minimum angular resolution) for the adapting scheme and 0.47 logMAR for the non-adapting scheme, both monotonously. Comparison between the two down-sampling schemes was made. For low array irregularity, non-adapting down-sampling afforded higher visual acuity, whereas for higher irregular the adapting approach did. Head movements were observed to play significant roles in the acuity tests
Date of Conference: 17-18 January 2006
Date Added to IEEE Xplore: 10 April 2006
Print ISBN:0-7803-8741-4
ISSN Information:
PubMed ID: 17281426
Department of Biomedical Engineering, Tsinghua University, Beijing, China
Department of Biomedical Engineering, Tsinghua University, Beijing, China
Department of Biomedical Engineering, Tsinghua University, Beijing, China
Department of Biomedical Engineering, Tsinghua University, Beijing, China
Department of Biomedical Engineering, Tsinghua University, Beijing, China
Contents Department of Biomedical Engineering, Tsinghua University, Beijing, China
Department of Biomedical Engineering, Tsinghua University, Beijing, China
Department of Biomedical Engineering, Tsinghua University, Beijing, China
Department of Biomedical Engineering, Tsinghua University, Beijing, China
Department of Biomedical Engineering, Tsinghua University, Beijing, China
