NDLI: Effects of spatial resolution and frame rate on mobility.

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Effects of spatial resolution and frame rate on mobility.

Content Provider	CiteSeerX
Author	Jason Dowling, A. Wageeh Boles, A. Anthony Maeder, B.
Abstract	Abstract. Electrical stimulation of the human visual system can result in the per-ception of blobs of light, known as phosphenes. Artificial Human Vision (AHV or visual prosthesis) systems use this method to provide a visual substitute for the blind. This paper reports on our experiments involving normally sighted partici-pants using a portable AHV simulation. A Virtual Reality Head Mounted Display is used to display the phosphene simulation. Custom software converts captured images from a head mounted USB camera to a DirectX based phosphene simula-tion. The effects of frame rate (1, 2 and 4 FPS) and phosphene spatial resolution (16x12 and 32x24) on participant Percentage of Preferred Walking Speed (PPWS) and mobility errors were assessed during repeated trials on an artificial indoor mo-bility course. Results indicate that spatial resolution is a significant factor in re-ducing contact with obstacles and following a path without veering, however the phosphene display frame rate is a better predictor of a person’s preferred walking speed. These findings support the development of an adaptive display which could provide a faster display with reduced spatial resolution when a person is walking comfortably and a slower display with higher resolution when a person has stopped moving.
File Format	PDF
Access Restriction	Open
Subject Keyword	Frame Rate Spatial Resolution Visual Substitute Phosphene Simula-tion Participant Percentage Reduced Spatial Resolution Human Visual System Significant Factor Virtual Reality Head Mounted Display Artificial Human Vision Artificial Indoor Mo-bility Course Usb Camera Preferred Walking Speed Electrical Stimulation Adaptive Display Re-ducing Contact Phosphene Simulation Mobility Error Visual Prosthesis Custom Software Convert Phosphene Display Frame Rate Portable Ahv Simulation Phosphene Spatial Resolution
Content Type	Text
Resource Type	Article

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