|
|
Panoramas General Considerations | Cylindrical | Spherical | Cubic Rectilinear | Multimedia Panos Rectilinear Panoramas Multiple photographs of a scene can be 'sewn together' to form larger, more information rich photographs. Rectilinear panos, composited from multiple images, can generate images with much higher resolution and information capacity than is possible with a single digital capture. For example a rectilinear pano created from multiple 35mm format images can have greater resolution than a photograph from a medium or large format camera. These 'flat' panos are generated in software by first projecting the images comprising the horizontal and vertical field of view onto a corresponding section of a sphere and then reprojecting the result back onto a two dimensional surface. One property rectilinear projections share with cylindrical panos is that as the image moves from the horizon line, established by a horizontally leveled cam- era, 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 larger than Africa. Where this form of distortion is undesirable, wide horizontal field of view panos limit the vertical field of view to a region near to the horizon, the latitudinal equivalent to the equator on the projection sphere. Wide horizon field of view panos, an image of a string of mountain tops for example, are often built using many adjacent horizon photographs shot using telephoto lenses with narrow fields of view. This limits the image's distortion in the vertical direction and simplifies stitching. |
|
|||||||||||||||
 Contact | About Us | © Cultural Heritage Imaging 2002-2008 |
