Topic
Light field
About: Light field is a research topic. Over the lifetime, 5357 publications have been published within this topic receiving 87424 citations.
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TL;DR: This work presents a new approach to compressive light field photography that exploits a joint tensor low-rank and sparse prior (LRSP) on natural light fields that exploits the redundancies of high dimensional visual signals using a tensor high-rank prior.
30 citations
TL;DR: A hybrid imaging system containing a light field camera and a high-resolution digital single lens reflex camera is designed, and these two kinds of cameras share the same optical path with a beam splitter so as to achieve the reconstruction of high- resolution light fields.
Abstract: Recently, light field cameras have drawn much attraction for their innovative performance in photographic and scientific applications. However, narrow baselines and constrained spatial resolution of current light field cameras impose restrictions on their usability. Therefore, we design a hybrid imaging system containing a light field camera and a high-resolution digital single lens reflex camera, and these two kinds of cameras share the same optical path with a beam splitter so as to achieve the reconstruction of high-resolution light fields. The high-resolution 4D light fields are reconstructed with a phase-based perspective variation strategy. First, we apply complex steerable pyramid decomposition on the high-resolution image from the digital single lens reflex camera. Then, we perform phase-based perspective-shift processing with the disparity value, which is extracted from the upsampled light field depth map, to create high-resolution synthetic light field images. High-resolution digital refocused images and high-resolution depth maps can be generated in this way. Furthermore, controlling the magnitude of the perspective shift enables us to change the depth of field rendering in the digital refocused images. We show several experimental results to demonstrate the effectiveness of our approach.
30 citations
TL;DR: In this article, a phase-only spatial light modulator (SLM) was proposed to tailor the amplitude and phase of a complex light field, as well as the transverse states of polarization.
Abstract: We present a method to tailor not only amplitude and phase of a complex light field, but also the transverse states of polarization. Starting from the implementation of spatially inhomogeneous distributions of polarization, so called Poincare beams, we realized a holographic optical technique that allows arbitrarily modulating the states of polarization by a single phase-only spatial light modulator (SLM). Moreover, the effective amplitude modulation of higher order beams performed by a phase-only SLM is shown. We will demonstrate the capabilities of our method ranging from the modulation of higher order Gaussian modes including desired polarization characteristics to the generation of polarization singularities at arbitrary points in the transverse plane of Poincare beams.
30 citations
TL;DR: In this paper, the superradiant emission properties from an atomic ensemble with cascade level configuration are numerically simulated and correlated spontaneous emissions (signal then idler fields) are purely stochastic processes initiated by quantum fluctuations.
Abstract: The superradiant emission properties from an atomic ensemble with cascade level configuration is numerically simulated. The correlated spontaneous emissions (signal then idler fields) are purely stochastic processes which are initiated by quantum fluctuations. We utilize the positive-$P$ phase-space method to investigate the dynamics of the atoms and counterpropagating emissions. The light field intensities are calculated, and the signal-idler correlation function is studied for different optical depths of the atomic ensemble. A shorter correlation time scale for a denser atomic ensemble implies a broader spectral window needed to store or retrieve the idler pulse.
30 citations
TL;DR: For the first time, light field 3D image reproduction with a maximum spatial resolution of approximately 330,000 pixels, which is near standard-definition television resolution and three times that of conventional light field display using a lens array, is achieved.
Abstract: Natural three-dimensional (3D) images, perceived as real objects in front of the viewer, can be displayed by faithfully reproducing light ray information. However, 3D images with sufficient characteristics for practical use cannot be displayed using conventional technologies because highly accurate reproduction of numerous light rays is required. We propose a novel full-parallax light field 3D display method named 'Aktina Vision', which includes a special top-hat diffusing screen with a narrow diffusion angle and an optical system for reproducing high-density light rays. Our prototype system reproduces over 100,000,000 light rays at angle intervals of less than 1° and optimally diffuses light rays with the top-hat diffusing screen. Thus, for the first time, light field 3D image reproduction with a maximum spatial resolution of approximately 330,000 pixels, which is near standard-definition television resolution and three times that of conventional light field display using a lens array, is achieved.
29 citations