Light field

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

Light field imaging coding: Performance assessment methodology and standards benchmarking

Abstract: It is well known that the conventional ways to capture the light around us are limited and thus provide a limited user experience, notably in terms of parallax capabilities. As this has been preventing 3D systems to explode in the market, significant advances are emerging in terms of light capturing technologies among which is relevant to highlight the socalled light field cameras which capture a richer representation of the visual scene by measuring the light intensity for each direction and for each pixel position. Considering the huge amount of light intensity data involved, efficient compression becomes a must. In this context, this paper addresses the light field coding challenge by using available image coding standard solutions. With this target in mind, this paper proposes first a compression performance assessment methodology and presents after the compression performance of the direct, fully compatible usage of the main image coding standards available, notably JPEG, JPEG 2000, H.264/AVC Intra and HEVC Intra for a representative set of light field images. While the expected conclusion is that HEVC Intra is the most efficient codec, other less expected conclusions emerge.

Strongly entangled light from planar microcavities

Abstract: The emission of entangled light from planar semiconductor microcavities is studied and the entanglement properties are analyzed and quantified Phase matching of the intracavity scattering dynamics for multiple pump beams or pulses, together with the coupling to external radiation, leads to the emission of a manifold of entangled photon pairs A decomposition of the emitted photons into two parties leads to a strong entanglement of the resulting bipartite system For the quantification of the entanglement, the Schmidt number of the system is determined by the construction of Schmidt number witnesses It is analyzed to which extent the resources of the originally strongly entangled light field are diminished by dephasing in propagation channels

The Properties of a Light Field Interacting with a Four-level Atom

Abstract: The system comprising a four-level cascade atom and a light field of single mode with frequency Ω is investigated. The mean photon number, coherence and squeezed states for the light field are discussed. 36% squeezing has been found.

A Variational Model for Intrinsic Light Field Decomposition

Abstract: We present a novel variational model for intrinsic light field decomposition, which is performed on four-dimensional ray space instead of a traditional 2D image. As most existing intrinsic image algorithms are designed for Lambertian objects, their performance suffers when considering scenes which exhibit glossy surfaces. In contrast, the rich structure of the light field with many densely sampled views allows us to cope with non-Lambertian objects by introducing an additional decomposition term that models specularity. Regularization along the epipolar plane images further encourages albedo and shading consistency across views. In evaluations of our method on real-world data sets captured with a Lytro Illum plenoptic camera, we demonstrate the advantages of our approach with respect to intrinsic image decomposition and specular removal.