A fundamental task of a virtual-environment system is to present images that change appropriately as the user's head
moves. Latency produces registration error causing the scene to appear spatially unstable. To improve the spatial
stability of the scene, we built a system that, immediately before scanout to a head-mounted raster display, selects a
portion of each scanline from an image rendered at a wider display width. The pixel selection corrects for yaw head
rotations and effectively reduces latency for yaw to the millisecond range. In informal evaluations, users consistently
judged visual scenes more stable and reported no additional visual artifacts with horizontal scanline selection than the
same system without. Scanline-selection hardware can be added to existing virtual-reality systems as an external device
between the graphics card and the raster display.
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