Dual photography is a photographic technique that uses
Helmholtz reciprocity
The Helmholtz reciprocity principle describes how a ray of light and its reverse ray encounter matched optical adventures, such as reflections, refractions, and absorptions in a passive medium, or at an interface. It does not apply to moving, no ...
to capture the
light field
A light field, or lightfield, is a vector-valued function, vector function that describes the amount of light flowing in every direction through every point in a space. The space of all possible ''light rays'' is given by the Five-dimensional space ...
of all light paths from a
structured illumination source to a camera.
Image processing software can then be used to reconstruct the scene as it would have been seen from the viewpoint of the projector.
See also
*
Light-field camera
References
External links
* http://graphics.stanford.edu/papers/dual_photography/
Photographic techniques
Imaging
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