Title :
Psychophysics of Prosthetic Vision: III. Stochastic Rendering, the Phosphene Image, and Perception
Author :
Hallum, Luke E. ; Cloherty, Shaun L. ; Taubman, David S. ; Suaning, Gregg J. ; Lovell, Nigel H.
Author_Institution :
Graduate Sch. of Biomed. Eng., New South Wales Univ., Sydney, NSW
Abstract :
For pt.I see ibid., p.Z004024-7. For pt.II see ibid., p.Z004558-61. This paper examines the rendering of luminous spots ("phosphenes") in the visual field, and their stochastic positioning as a means of anti-aliasing the resulting spotty image ("phosphene image"). We derive an equation concerning the correlations of pairs of phosphenes comprising the phosphene image, and show the relationship to the statistics governing the stochastic positioning. We present some examples where stochastic rendering assists the veridical perception of textures, and argue for its superiority as cf. ordered rendering. Our preliminary results suggest that it may be perceptually effective to manufacture disordered arrays of stimulating electrodes for intraocular implantation
Keywords :
eye; prosthetics; psychology; statistical analysis; stochastic processes; visual perception; disordered stimulating electrode arrays; intraocular implantation; luminous spot rendering; phosphene image; prosthetic vision; psychophysics; statistics; stochastic positioning; stochastic rendering; veridical texture perception; visual field; visual perception; Australia; Biomedical engineering; Frequency; Prosthetics; Psychology; Random variables; Rendering (computer graphics); Retina; Statistics; Stochastic processes;
Conference_Titel :
Engineering in Medicine and Biology Society, 2006. EMBS '06. 28th Annual International Conference of the IEEE
Print_ISBN :
1-4244-0032-5
Electronic_ISBN :
1557-170X
DOI :
10.1109/IEMBS.2006.259956
