Can you create an 'inside-out' panorama by circling a subject?
Asked 8/4/2012
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Is it possible to make the opposite of a normal panorama by moving the camera around a subject and stitching the images into one flat image? For example, could you circle a car and produce a single image that shows both sides at once? Is there a proper name for this technique, and would it require using only a narrow vertical strip from each frame?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
14y ago
2 Answers
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Instead of negative panorama you could call it a map projection of a tridimensional object (on a bidimensional plane). Similar to map making you would incur distortions of (some of) the geometrical quantities (angles, for instance).
Obviously all photographies are planar projections: the difference here is that you are "surrounding" your object with a cylinder, then cutting the projection from the interior on this cylinder longitudinally and mapping it to a plane. In a panorama you do the same but you project from the exterior towards the cylinder.
Originally by user5032. Source · Licensed CC BY-SA 4.0
user5032
14y ago
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Yes. This is essentially an unwrapped cylindrical projection of a 3D object rather than a standard outward-facing panorama. You photograph while moving around the subject, then map the subject’s surface onto a cylinder and “unwrap” that cylinder into a flat image. Like any map projection, it introduces distortion, so it won’t preserve all geometry perfectly.
A related term is slit-scan photography, since these results are often built from narrow slices of successive frames. One research name for the idea is "unwrap mosaics," where a video shot while circling the object is stitched into an unwrapped texture-like image.
So the concept is real, but it is not a normal panorama workflow. Using a thin strip from each image can be part of the method, especially in slit-scan-style approaches. The result can show multiple sides of an object at once, but with projection-related distortion.
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