Difference between revisions of "Light field"
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| − | A '''light field''' is a | + | A '''light field''' is a method of representing [[light]] that keeps track of the angle of each ray of light. It can be a volume of light treated as a set of [[ray]]s, or a flat surface through which different angled light travels. It is a set of rays with coordinate origin. |
Each ray has a magnitude and angle. A light field is the set of light rays flowing through a point, surface or volume from every direction. It approximately represents how light travels in physical space from a [[ray optics]] perspective. It is also known as a radiance field. | Each ray has a magnitude and angle. A light field is the set of light rays flowing through a point, surface or volume from every direction. It approximately represents how light travels in physical space from a [[ray optics]] perspective. It is also known as a radiance field. | ||
Revision as of 07:47, 13 September 2024
A light field is a method of representing light that keeps track of the angle of each ray of light. It can be a volume of light treated as a set of rays, or a flat surface through which different angled light travels. It is a set of rays with coordinate origin.
Each ray has a magnitude and angle. A light field is the set of light rays flowing through a point, surface or volume from every direction. It approximately represents how light travels in physical space from a ray optics perspective. It is also known as a radiance field.
A light field can be displayed using a light field display, which is a type of multifocal display.
It is possible to record a light field using a light field camera, such as a camera from Lytro.
"Lightfield", "plenoptic", and "integral imaging" are all the same.
A light field can be represented using a plenoptic function, which is a 5 dimensional function. A light field can be represented in 4 dimensions using the two-plane method.[1]
Light fields are useful for 3D because the largest or second largest factor that determines focus is the angle of rays coming into a human eye.
Representation
There are multiple ways to represent a light field using data. A method is the two-plane method, which results in a 4D representation.
A light field can be black and white or full color.
Light fields can be represented using euclidean spatial representation, instead of having to use a relativistic understanding.
History
Leonardo da Vinci explored the idea of a scene consisting of light rays of various angles.[2]
The term "light field" was used by A. Gershun in a paper.
Work in computational light fields was done by Marc Levoy and Pat Hanrahan.[3]
Light field rendering research has focused on novel viewpoints for existing data, but largely for 2D screens.[4]
See also
References
- ↑ Gortler, Steven J.; Grzeszczuk, Radek; Szeliski, Richard; Cohen, Michael F. (1996). "The lumigraph". ACM. p. 43–54. doi:10.1145/237170.237200. ISBN 978-0-89791-746-9.
- ↑ http://lightfield-forum.com/2012/08/lightfield-history-who-invented-the-concept-of-the-light-field/
- ↑ "Light Field Rendering". http://www-graphics.stanford.edu/papers/light/.
- ↑ https://pages.cs.wisc.edu/~dyer/cs534/papers/levoy-light-field-tutorial.pdf