GVU Technical Report Number:
GIT-GVU-95-04
Title:
Using Texture Maps to Correct for Optical Distortion in Head-Mounted Displays
Authors:
Benjamin A. Watson
Larry F. Hodges
Abstract:
This paper describes a fast method of correcting for optical distortion
in head-mounted displays (HMDs). Since the distorted display surface
in an HMD is not rectilinear, the shape and location of the graphics
window used with the display must be chosen carefully, and some
corrections made to the predistortion model. A distortion correction
might be performed with optics that reverse the distortion caused by
HMD lenses, but such optics can be expensive and offer a correction
for only one specific HMD. Integer incremental methods or a lookup
table might be used to calculate the correction, but an I/O bottleneck
makes this impractical in software. Instead, a texture map may be
defined that approximates the required optical correction. Recent
equipment advances allow undistorted images to be input into texture
mapping hardware at interactive rates. Built in filtering handles
predistortion aliasing artifacts.
Keywords:
Computer graphics, virtual reality, optical distortion, predistortion,
head-mounted displays
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