1 May 2007 Effects of image intensifier halo on perceived layout
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Night vision devices (NVDs) or night-vision goggles (NVGs) based on image intensifiers improve nighttime visibility and extend night operations for military and increasingly civil aviation. However, NVG imagery is not equivalent to daytime vision and impaired depth and motion perception has been noted. One potential cause of impaired perceptions of space and environmental layout is NVG halo, where bright light sources appear to be surrounded by a disc-like halo. In this study we measured the characteristics of NVG halo psychophysically and objectively and then evaluated the influence of halo on perceived environmental layout in a simulation experiment. Halos are generated in the device and are not directly related to the spatial layout of the scene. We found that, when visible, halo image (i.e. angular) size was only weakly dependent on both source intensity and distance although halo intensity did vary with effective source intensity. The size of halo images surrounding lights sources are independent of the source distance and thus do not obey the normal laws of perspective. In simulation experiments we investigated the effect of NVG halo on judgements of observer attitude with respect to the ground during simulated flight. We discuss the results in terms of NVG design and of the ability of human operators to compensate for perceptual distortions.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James E. Zacher, James E. Zacher, Tracey Brandwood, Tracey Brandwood, Paul Thomas, Paul Thomas, Margarita Vinnikov, Margarita Vinnikov, Gancun Xu, Gancun Xu, Sion Jennings, Sion Jennings, Todd Macuda, Todd Macuda, Stephan A. Palmisano, Stephan A. Palmisano, Greg Craig, Greg Craig, Laurie Wilcox, Laurie Wilcox, Robert S. Allison, Robert S. Allison, "Effects of image intensifier halo on perceived layout", Proc. SPIE 6557, Head- and Helmet-Mounted Displays XII: Design and Applications, 65570U (1 May 2007); doi: 10.1117/12.719892; https://doi.org/10.1117/12.719892

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