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Panoramas General Considerations | Cylindrical | Spherical | Cubic Rectilinear | Multimedia Panos Cylindrical Panoramas Cylindrical panos are built by mathematically projecting an environment’s photographic information onto the inside of an imaginary cylinder that surrounds the environment. They offer up to a full 360 degree documentation around the scene in a horizontal direction. This view is analogous to what a viewer would see standing on a rotating platform with a remote control that could turn the platform to the left and right as desired. The viewer could tilt their head up or down within a limited range but not all the way up or down. Cylindrical panos usually do not contain information directly overhead or straight down, limiting the vertical field of view. One property of cylindrical projections is that, as the image moves from the horizon line towards straight up and straight down, the image begins to stretch. This produces an effect similar to that on some flat world maps where Greenland appears as large as Africa, when it is, in fact, only one fourteenth the size. The limitation of vertical field of view has it advantages. Many scenes do not require what is directly overhead or near our feet. Limiting imaging work to a content filled, flexible viewing range of roughly 100 to 120 degrees saves imaging time and stitching work. It also permits the use of single shot panorama reflector equipment that enable a cylindrical pano to be captured in a single photograph. |
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