degrees vertical angle of view, as
shown in the shot of Red Square
(right). A spherical panorama can
also be converted into 6 cube faces
for use in a QuickTime VR (QTVR)
interactive movie or similar; this
is show below, and you can work
out how it would fold into a cube.
For partial panoramas, either a
Equirectangular projection of a spherical panorama of Red Square at night. A combination of a 17mm rectilinear lens and
an 8mm fisheye were used to capture the entire scene. The lower hemisphere was taken with the 17mm lens in 21 shots, whilst
the sky was captured using two shots at 0° and 90° yaw using the fisheye lens.
rectilinear or cylindrical mapping
can also work depending on total
angle of view. Interesting effects can
be created using the 360 degree
fisheye or Stereographic projections
which are often used to produce
“Small World” panoramas.
Á
Above: A 360° horizontal cylindrical
panorama. The cylinderical projection
cannot display the entire sphere as
the poles are infinitely stretched. The
panorama has been cropped to show a
central belt of the cylinder.
Facing page: Small World Panorama.
The entire panorama has been
remapped using a 360° fisheye
pointing at the nadir. Barrel distortion
has then been used to stretch the details
at the equator. Seen aiming down.
Right: Stereographic projection. Similar
to the 360° fisheye, the stereographic
projection naturally stretches objects
which lie further from the centre.
However, unlike the 360° fisheye, the
stereographic projection cannot map
the entire sphere. Seen aiming up.
All photographs © Daniel K L Oi.
You can view Daniel’s QTVR versions of
panoramas through his website:
http://cnqo.phys.strath.ac.
uk/~daniel/Panos/
These may require special plugins or
viewers which are free to download.
photoworld 20
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