Light field

About: Light field is a research topic. Over the lifetime, 5357 publications have been published within this topic receiving 87424 citations.

Planar light-emitting device and image display device

Abstract: PROBLEM TO BE SOLVED: To achieve a planar light-emitting device outputting uniform planar light on the basis of light output from a plurality of point light sources. SOLUTION: A planar light-emitting device 1 has light input windows 2a-2d for inputting light from point light sources 5a-5d disposed outside; and a light guiding member 3 having a scattering area 4 scattering the input light. Each window 2a-2d has a function of adjusting a light travelling direction and the like so that a light intensity distribution pattern in a free space has a symmetry of C 4V if necessary for the input light from the point light sources 5a-5d, and light scattering members are disposed so as to have the symmetry of C 4V on the scattering area 4. COPYRIGHT: (C)2005,JPO&NCIPI

Advances in the light field displays based on integral imaging and holographic techniques (Invited Paper)

Abstract: Light field displays comprise three-dimensional (3D) visual information presentation devices capable of providing realistic and full parallax autostereoscopic images. In this letter, the recent advances in the light field displays based on integral imaging (II) and holographic techniques are presented. Several advanced approaches to demonstrate the light field displays including viewing angle enhancement techniques of the II display, a fast hologram generation method using graphics processing unit (GPU) and multiple WRPs, and a holographic microscopy to display the living cells are reported. These methods improve some important constraints of the light field displays and add new features.

Downsampling light field images

Abstract: According to various embodiments of the invention, improved downsampling techniques are employed, which can be applied to light field images and which preserve the ability to refocus (and otherwise manipulate) such images. Groups of pixels, rather than individual pixels, are downsampled; such groups of pixels can be defined, for example, as disks of pixels. Such downsampling is accomplished, for example, by aggregating values for pixels having similar relative positions within adjacent disks (or other defined regions or pixel groups) of the image. When applied to light field images, the downsampling techniques of the present invention reduce spatial resolution without sacrificing angular resolution. This ensures that the refocusing capability of the resulting light field image is not reduced and/or adversely impacted.

Phase and magnitude constrained metasurface holography at W-band frequencies.

Abstract: Holographic optics are an essential tool for the control of light, generating highly complex and tailored light field distributions that can represent physical objects or abstract information. Conceptually, a hologram is a region of space in which an arbitrary phase shift and amplitude variation are added to an incident reference wave at every spatial location, such that the reference wave will produce a desired field distribution as it scatters from the medium. Practical holograms are composed of materials, however, which have limited properties that constrain the possible field distributions. Here, we show it is possible to produce a hologram with continuous phase distribution and a non-uniform amplitude variation at every point by leveraging resonant metamaterial elements and constraining the hologram’s pixels to match the elements’ resonant behavior. We demonstrate the viability of the resonant metamaterial approach with a single layer, co-polarized holographic metasurface that produces an image at millimeter wavelengths (92.5 GHz) despite the elements’ limited phase range and coupled amplitude dependency.

Interactive light field for non-visual stimulation

Abstract: Off axis photon stimulation of a person's eye, provided by a light field which is either uniform or interactive depending on pupil position, provides for biological and/or psychological benefits. The photon stimulation is advantageously provided using eye wear with embedded or affixed light delivery elements such as fiber optic members.