Light field: Difference between revisions
Xinreality (talk | contribs) No edit summary |
RealEditor (talk | contribs) No edit summary |
||
| (3 intermediate revisions by 2 users not shown) | |||
| Line 1: | Line 1: | ||
A '''light field''' (also spelled '''lightfield''') is a fundamental concept in [[optics]] and [[computer graphics]] that describes the amount of [[light]] traveling in every direction through every point in [[space]].<ref name="LevoyHanrahan1996">Levoy, M., & Hanrahan, P. (1996). Light field rendering. ''Proceedings of the 23rd annual conference on Computer graphics and interactive techniques - SIGGRAPH '96'', 31-42.</ref><ref name="Gortler1996">Gortler, S. J., Grzeszczuk, R., Szeliski, R., & Cohen, M. F. (1996). The Lumigraph. ''Proceedings of the 23rd annual conference on Computer graphics and interactive techniques - SIGGRAPH '96'', 43-54.</ref> Essentially, it's a vector function that represents the [[radiance]] of light rays at any position and direction within a given volume or area. Understanding and utilizing light fields is crucial for advancing [[virtual reality]] (VR) and [[augmented reality]] (AR) technologies, as it allows for the capture and reproduction of visual scenes with unprecedented realism, including effects like [[parallax]], [[reflection]]s, [[refraction]]s, and [[refocusing]] after capture, while also aiming to solve critical issues like the [[vergence-accommodation conflict]].<ref name="Ng2005">Ng, R. (2005). Digital Light Field Photography. ''Ph.D. Thesis, Stanford University''.</ref><ref name="Lanman2013">Lanman, D., & Luebke, D. (2013). Near-eye light field displays. ''ACM SIGGRAPH 2013 Talks'', 1-1.</ref> | A '''light field''' (also spelled '''lightfield''') is a fundamental concept in [[optics]] and [[computer graphics]] that describes the amount of [[light]] traveling in every direction through every point in [[space]].<ref name="LevoyHanrahan1996">Levoy, M., & Hanrahan, P. (1996). Light field rendering. ''Proceedings of the 23rd annual conference on Computer graphics and interactive techniques - SIGGRAPH '96'', 31-42.</ref><ref name="Gortler1996">Gortler, S. J., Grzeszczuk, R., Szeliski, R., & Cohen, M. F. (1996). The Lumigraph. ''Proceedings of the 23rd annual conference on Computer graphics and interactive techniques - SIGGRAPH '96'', 43-54.</ref> Essentially, it's a vector function that represents the [[radiance]] of light rays at any position and direction within a given volume or area. Understanding and utilizing light fields is crucial for advancing [[virtual reality]] (VR) and [[augmented reality]] (AR) technologies, as it allows for the capture and reproduction of visual scenes with unprecedented realism, including effects like [[parallax]], [[reflection]]s, [[refraction]]s, and [[refocusing]] after capture, while also aiming to solve critical issues like the [[vergence-accommodation conflict]].<ref name="Ng2005">Ng, R. (2005). Digital Light Field Photography. ''Ph.D. Thesis, Stanford University''.</ref><ref name="Lanman2013">Lanman, D., & Luebke, D. (2013). Near-eye light field displays. ''ACM SIGGRAPH 2013 Talks'', 1-1.</ref> | ||
| Line 13: | Line 12: | ||
===The Plenoptic Function=== | ===The Plenoptic Function=== | ||
The most | The most developed representation is the 7D plenoptic function which tracks a lightfield over time, P(x, y, z, θ, φ, λ, t), describing the radiance of light at any 3D point (x,y,z), in any direction (θ, φ), for any wavelength (λ), at any time (t).<ref name="AdelsonBergen1991"/> For many applications, this is overly complex and contains redundant information (for example light doesn't typically change along a straight ray in free space, radiance invariance, unless wavelength or time are critical).<ref name="WikiLF"/> | ||
===Simplified Light Fields=== | ===Simplified Light Fields=== | ||
| Line 89: | Line 88: | ||
* [[Magic Leap]]: Their [[spatial computing]] headsets incorporate light field principles to blend virtual and real content.<ref name="Art1Kress">Kress, B. C., & Chatterjee, I. (2020). "Waveguide combiners for mixed reality headsets: a nanophotonics design perspective." Nanophotonics, 9(11), 3653-3667.</ref><ref name="Art2FXGuide">[https://www.fxguide.com/fxfeatured/light-fields-the-future-of-vr-ar-mr/ fxguide: Light Fields - The Future of VR-AR-MR]</ref> | * [[Magic Leap]]: Their [[spatial computing]] headsets incorporate light field principles to blend virtual and real content.<ref name="Art1Kress">Kress, B. C., & Chatterjee, I. (2020). "Waveguide combiners for mixed reality headsets: a nanophotonics design perspective." Nanophotonics, 9(11), 3653-3667.</ref><ref name="Art2FXGuide">[https://www.fxguide.com/fxfeatured/light-fields-the-future-of-vr-ar-mr/ fxguide: Light Fields - The Future of VR-AR-MR]</ref> | ||
* [[Leia Inc.]]: Creates light field displays for mobile devices.<ref name="Art1Fattal">Fattal, D., Peng, Z., Tran, T., Vo, S., Fiorentino, M., Brug, J., & Beausoleil, R. G. (2013). "A multi-directional backlight for a wide-angle, glasses-free three-dimensional display." Nature, 495(7441), 348-351.</ref> | * [[Leia Inc.]]: Creates light field displays for mobile devices.<ref name="Art1Fattal">Fattal, D., Peng, Z., Tran, T., Vo, S., Fiorentino, M., Brug, J., & Beausoleil, R. G. (2013). "A multi-directional backlight for a wide-angle, glasses-free three-dimensional display." Nature, 495(7441), 348-351.</ref> | ||
* [[CREAL]]: Swiss startup developing near-eye light field displays specifically targeting the VAC issue in AR/VR.<ref name="Art2CrealRoad">[https://www.roadtovr.com/creal-light-field-display-new-immersion-ar/ Road to VR: Hands-on: CREAL's Light-field Display Brings a New Layer of Immersion to AR]</ref><ref name="Art2CrealSite">[https://creal.com/ CREAL: Light-field Display Technology]</ref> | * [[CREAL]]: Swiss startup developing near-eye light field displays specifically targeting the [[VAC]] issue in AR/VR.<ref name="Art2CrealRoad">[https://www.roadtovr.com/creal-light-field-display-new-immersion-ar/ Road to VR: Hands-on: CREAL's Light-field Display Brings a New Layer of Immersion to AR]</ref><ref name="Art2CrealSite">[https://creal.com/ CREAL: Light-field Display Technology]</ref> | ||
* Light Field Lab: Developing large-scale holographic light field displays. | * Light Field Lab: Developing large-scale holographic light field displays. | ||