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, non ...
to capture the
light field
The light field is a vector function that describes the amount of light flowing in every direction through every point in space. The space of all possible '' light rays'' is given by the five-dimensional plenoptic function, and the magnitude of e ...
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
A light field camera, also known as a plenoptic camera, is a camera that captures information about the ''light field'' emanating from a scene; that is, the intensity of light in a scene, and also the precise direction that the light rays are tr ...
References
{{reflist
External links
* http://graphics.stanford.edu/papers/dual_photography/
Photographic techniques
Imaging