NDLI: The integral image method for fisheye images

Content Provider	IEEE Xplore Digital Library
Author	Mikhisor, M. Wyvill, G. McCane, B. Mills, S.
Copyright Year	2013
Description	Author affiliation: Dept. of Comput. Sci., Otago Univ., Dunedin, New Zealand (Mikhisor, M.; Wyvill, G.; McCane, B.; Mills, S.)
Abstract	Because of strong radial distortion, fisheye images have to be rectified before use in most computer vision algorithms. We investigate three ways to rectify fisheye images: the rectangular local perspective projection, local perspective projection bounded by longitude and latitude lines, and cylindrical projection. The traditional integral image method doesn't work for local projections, because they produce patches with curved edges. We find the integral over any local projection patch by traversing the patch edges, rather than using just the corner values. This is slower than the conventional method, but still fast enough for real time applications. We can compute integrals for 5000 patches in 10 ms on a fisheye image of 640 × 480 pixels. Computing local projections themselves is slow (120 ms for 5000 patches), while the cylindrical projection needs only 15 ms for the whole image.
Sponsorship	IEEE New Zealand Central Sect.
Starting Page	1
Ending Page	6
File Size	6512845
Page Count	6
File Format	PDF
ISSN	21512191
e-ISBN	9781479908837
DOI	10.1109/IVCNZ.2013.6726983
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-11-27
Publisher Place	New Zealand
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Computer vision Accuracy Image edge detection Cameras Real-time systems Face Lenses
Content Type	Text
Resource Type	Article

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