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On Fri, 27 Jun 1997, roger haar wrote:
Several of us have been discussing the pinhole camera. We
disagreed on using the terms "image" and "focus" in conjuction with
...
Advanced optics text refer to the mapping from the image space to
the object space and imply a one-to-one mapping. A pinhole camera is a
many-point-to-many-point mapping and is either some extreme limiting case
of the acceptable mapping or it just does not form an image.
....
Does the image formed by a single lens even deserve to be called a
one-to-one mapping? After all it loses 3-D depth information. A hologram
does depth, but has limitations of resolution, and other problems that
lens images do not.