M. Boulianne et al., HEMISPHERICAL PHOTOGRAPHS USED FOR MAPPING CONFINED SPACES, Photogrammetric engineering and remote sensing, 63(9), 1997, pp. 1103-1109
This paper presents two methods for using fisheye photographs for mapp
ing confined areas. The first approach is intended for relatively flat
objects, observed at very close range, and consists of producing a re
ctified view from a fisheye photograph. After scanning and correcting
the spherical distortions present in the original image, a simple proj
ective transformation creates a constant scale image from which two-di
mensional (2D) data can be extracted. The second method aims at recove
ring three-dimensional data from two stereo fisheye photographs. This
method also involves the same image correction for spherical distortio
ns, but the two resulting perspective images are afterwards analyzed u
tilizing stereovision in a digital photogrammetric workstation. Practi
cal experiments, conducted with a 35-mm camera equipped with a fisheye
lens, demonstrate the applicability and feasibility of the two softco
py photogrammetry methods in the context of mapping electric distribut
ion wells.