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Displaying human visual field data as shaded surfaces

University of British Columbia

Human visual field data collected by kinetic threshold perimetry are three-dimensional, and early efforts at graphical presentation have not been effective in conveying the behaviour of the data. The approach taken herein improves upon these earlier renditions by displaying visual field data as shaded surfaces. A system is developed that synthesizes continuous-tone, grey-level images of a surface viewed from, and illuminated from, any specified direction. The original contour data may be superposed upon any view of the visual field surface to enhance interpretation. A zoom operation allows for closer inspection of surface detail. A memory map technique is used to vary surface shade in real time with the movement of a light source about the surface. It is shown that to effectively simulate unrestricted light source movement, frame buffer pixels should be at least 12 bits wide.

Text

2010-05-22

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http://hdl.handle.net/2429/24930

Electrical and Computer Engineering

University of British Columbia

Graduate