Abstract
One of the problems in using HMDs is that the virtual images
shown through the HMDs are usually warped due to their optical distortions.
In order to correctly compensate the optical distortions through a predistortion technique, accurate
values of the distortion parameters are required. Although several
distortion calibration methods have been developed in prior work,
these methods have some limitations. In this paper, we propose a method
for accurately estimating the optical distortion parameters of both
immersive and (optical) see-through HMDs, without the limitations.
The proposed method is based on photogrammetry and considers not only
the radial distortion but also the tangential distortion. Its effectiveness,
including the effects of different coefficient orders of radial and
tangential distortions, are evaluated through an experiment conducted
with two different HMDs, an optical see-through head-mounted projection
display (HMPD) and a commercially available immersive HMD. According
to the experimental results, the proposed method showed significantly
lower reprojection and line-fitting errors than a previous method
proposed by Owen , and the radial distortion coefficients estimated by the proposed method
were significantly more accurate than the nominal values obtained
from the HMD optics prescription. In addition, when both the radial
and tangential distortions were considered, the proposed method was
significantly more effective than when only the radial distortion
was considered. We also discuss an OpenCV-based simple implementation
of a distortion correction method.
© 2014 IEEE
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