Changes

A near-eye lightfield display may be paired with a computer system that automatically updates the rendering viewpoint according to positional and orientational sensor data, such as a [[virtual reality]] system or [[augmented reality]].

A near-eye lightfield display may be paired with a computer system that automatically updates the rendering viewpoint according to positional and orientational sensor data, such as a [[virtual reality]] system or [[augmented reality]].

Near-eye light field displays introduce a light-field-based approach to NEDs. This allows for thinner and lighter [[display headset]]s that are capable of generating accurate [[accommodation]], [[convergence]], and [[binocular disparity]]. The two human eyes perceive the world slightly differently. In the same way, light rays that enter the pupil at different location will encode a slightly different picture of the world being observed <ref name=”3”>Stanford University. Near-Eye Light Field Displays. Retrieved from https://talks.stanford.edu/douglas-lanman-near-eye-light-field-displays/</ref><ref name=”4”> Fattal, D. (2016). The ultimate guide to 3D technologies. Retrieved from https://thenextweb.com/insider/2016/04/23/guide-to-3d-tech/#</ref>. A light field is composed of all the light rays at every point in space travelling in every direction. It is a 4D data, since every point in three-dimensional space is attributed a direction. This concept came about in the 1990s as a solution to problems in computer graphics and vision <ref name=”5”> LightField Forum. Refocus your Eyes: Nvidia presents Near-Eye Light Field Display Prototype. Retrieved from http://lightfield-forum.com/2013/07/refocus-your-eyes-nvidia-presents-near-eye-light-field-display-prototype/</ref>. Near-eye light field displays must independently render light rays that are coming from every direction through every point in space in order to trigger accommodation. Sharp images from out-of-focus display elements are depicted by synthesizing these light fields that correspond to virtual scenes located within the viewer’s natural accommodation range (Figure 1). Lanman and Luebke (2013) mention that “conventional displays are intended to emit light isotropically. In contrast, a light field display supports the control of tightly-clustered bundles of light rays, modulating radiance as a function of position and direction across its surface.”<ref name=”2”>Lanman, D. and Luebke, D. (2013). Near-Eye Light Field Displays. ACM Transactions on Graphics, 32(6)</ref><ref name=”3”></ref><ref name=”4”></ref>

Near-eye light field displays introduce a [[light field]]-based approach to NEDs. This allows for [[display headset]]s that are capable of generating accurate [[accommodation]], [[convergence]], and [[binocular disparity]]. They can also be thinner and lighter as well.

 

Two human eyes perceive the world slightly differently. In the same way, light rays that enter the pupil at different location will encode a slightly different picture of the world being observed <ref name=”3”>Stanford University. Near-Eye Light Field Displays. Retrieved from https://talks.stanford.edu/douglas-lanman-near-eye-light-field-displays/</ref><ref name=”4”> Fattal, D. (2016). The ultimate guide to 3D technologies. Retrieved from https://thenextweb.com/insider/2016/04/23/guide-to-3d-tech/#</ref>. A light field is composed of all the light rays at every point in space travelling in every direction. It is a 4D data, since every point in three-dimensional space is attributed a direction. This concept came about in the 1990s as a solution to problems in computer graphics and vision <ref name=”5”> LightField Forum. Refocus your Eyes: Nvidia presents Near-Eye Light Field Display Prototype. Retrieved from http://lightfield-forum.com/2013/07/refocus-your-eyes-nvidia-presents-near-eye-light-field-display-prototype/</ref>. Near-eye light field displays must independently render light rays that are coming from every direction through every point in space in order to trigger accommodation. Sharp images from out-of-focus display elements are depicted by synthesizing these light fields that correspond to virtual scenes located within the viewer’s natural accommodation range (Figure 1). Lanman and Luebke (2013) mention that “conventional displays are intended to emit light isotropically. In contrast, a light field display supports the control of tightly-clustered bundles of light rays, modulating radiance as a function of position and direction across its surface.”<ref name=”2”>Lanman, D. and Luebke, D. (2013). Near-Eye Light Field Displays. ACM Transactions on Graphics, 32(6)</ref><ref name=”3”></ref><ref name=”4”></ref>

Traditional HMDs only provide a single display plane; without a proper focus cue, the display decouples accommodations from the vergence of the eyes. Since there is a mismatch, the observer has to rely only on the binocular vision to perceive a 3D space. This can lead to visual discomfort, fatique, eye strain, and headaches <ref name=”6”> Stanford Computational Imaging Lab (2015). The Light Field Stereoscope - SIGGGRAPH 2015 [Video]. Retrieved from https://www.youtube.com/watch?v=YJdMPUF8cDM</ref>.

Traditional HMDs only provide a single display plane; without a proper focus cue, the display decouples accommodations from the vergence of the eyes. Since there is a mismatch, the observer has to rely only on the binocular vision to perceive a 3D space. This can lead to visual discomfort, fatique, eye strain, and headaches <ref name=”6”> Stanford Computational Imaging Lab (2015). The Light Field Stereoscope - SIGGGRAPH 2015 [Video]. Retrieved from https://www.youtube.com/watch?v=YJdMPUF8cDM</ref>.