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An interaction system based on integral imaging is presented. Two users are respectively in front of a 3D display system and communicate together. A half mirror enables to record the viewer's face with a camera while the 3D content is displayed. The 3D data recorded by the camera are then sent to the display system of the other user. In this way users can see each other in 3D and real eye-contact...
Experiments were conducted on three previously developed devices for three-dimensional (3D) television based on integral imaging. Two of the devices were image capture devices using a high resolution complementary metal oxide semiconductor image sensor and the other a camera array. Experiment results confirmed that the 3D images the devices capture had appropriate motion parallax. The third was a...
The micro-CPV concept uses an array of micro unit cells (or elements) such that the material usage, weight, and the required structural strength can all be scaled down favorably. Unfortunately, one of the essential unfavorable scaling factors is the assembly cost due to the many micro scale components that must be deposited, positioned, oriented, and connected over large areas. By using a dynamic...
Design optimizations for the previously proposed lens-to-channel waveguide concentrator is discussed. Using integrated tapered waveguides, up to 900x geometric concentration can be achieved without separate secondary optics under ideal conditions. A 600x practical system is built in Zemax and simulated using a Fresnel lens array, showing less than 1% structural loss and angular response over 0.6 degrees.
Over the past three years, the authors have collaborated on several significant advances in space photovoltaic concentrator technology, including a far more robust Fresnel lens for sunlight concentration, improved color-mixing features for the lens to minimize chromatic aberration losses for next-generation 4-junction and 6-junction IMM cells, a new approach to sun-tracking requiring only one axis...
Design verification testing of a new multi-channel antenna and receiver system is a significant and challenging undertaking. This paper describes a unique method for creating an intermediate system test prior to conducting outdoor field testing, or anechoic chamber testing. By substituting a Rotman lens for a multi-channel antenna, a slate of receiver and processing algorithm tests can be performed...
A 3 DOF micromirror is controlled to steer a laser beam for laser scanned display. The micromirror consists of a 1 mm mirror plate which is driven by four repulsive-force rotation electrostatic actuators. The micromirror is fabricated using the surface micromachining process, PolyMUMPs. The overall size of the micromirror including the four actuators is 3.5 mm by 3.5 mm. Each actuator can be controlled...
Many vision and augmented reality applications require knowing the rotation of the camera relative to an object or scene. In this paper we propose to create a structured light field designed explicitly to simplify the estimation of camera rotation. The light field is created using a lenticular sheet with a color coded backplane pattern, creating a lightfield where the observed color depends on the...
This paper emphasizes on the emergence of Metamaterials in the field of antenna designing. For enhancing the performance of the antenna in terms of various parameters viz. gain, directivity, main lobe and side lobe levels, bandwidth; metamaterials are used as an uniform flat lens along with the antenna. A novel 'U' shape slotted patch antenna & its array of 2fi2 is designed for 2.4 GHz frequency...
The hemispherical (or half-Luneburg) lens antenna is a candidate type for satellite communications-on-the-move, either singly or as an element in a small array. It offers good aperture efficiency in a reduced height and excellent scanning performance. This work describes the development of half Luneburg lens antennas together with feeding arrangements to provide highly directive antennas with good...
A two-dimensional Luneberg lens designed using a symmetrical metamaterial cell to operate a wide frequency band covering 8GHz–12GHz is proposed and studied. The proposed Luneberg lens is composed of an array of complementary circle cells and embedded in a parallel-plate TEM waveguide. Due to high resonant frequency of the complementary circle cell, the equivalent refractive index is nearly constant...
We propose a novel approach to generate 4D light field in the physical world for lighting reproduction. The light field is generated by projecting lighting images on a lens array. The lens array turns the projected images into a controlled anisotropic point light source array which can simulate the light field of a real scene. In terms of acquisition, we capture an array of light probe images from...
In this study, high efficiency thin film design with low UGR and batwing distribution in LED flat panel lighting is proposed. The batwing distribution can be used to enhance the uniformity for indoor lighting. Therefore, the micro-structure film is designed with v-cut and lenticular to transform the light distribution from lambetrian to batwing and keeps low UGR within 19. In this study, the holes...
In this paper, we propose a radio frequency (RF) lens-embedded massive multiple-input multiple-output (MIMO) system. To analyze the characteristics of RF lens antennas, we first introduce the beam propagation method (BPM) and use it to construct a new channel model. We next design a low complexity codebook reflecting the characteristics of the RF lens antennas for limited feedback. Numerical results...
Acoustic vision systems are gaining prominence due to ocean surveillance for internal security along coastal waters, in particular defence and engineering. Image generation is an effective method for underwater target exploration. Underwater acoustic imaging systems can identify objects according to the characteristic information obtained from the acoustic reflections from the object. Acoustic lens...
This paper describes development of the electrostatic planar extractors and lenses integrated with the ionic liquid ion source (ILIS) array to realize multi focused ion beam system. The extractors and the lenses reduced ion beam divergence angle from 11° to 7.9°. Also, switching control of ion beam was demonstrated by operating separated extractors. Finally we performed Si substrate etching using...
In this paper, a tunable THz lens array based on reconfigurable metamaterials is reported. The metamaterial consists with 40 × 40 liquid metal microdroplets, in which the shape is tuned under different air pressures. The droplets are formed by injecting the liquid mercury into a pre-designed microchannel network and arranged to focus incident THz wave. The focus spot size can be tuned with different...
The degradation of image resolution in a autostereoscopic 3D display using a directional-backlight system is a major defect to be improved. In this paper, we propose a method to enhance the perceived image quality by adopting double slit barrier array fabricated using a 3D printer.
A transmission-type three-dimensional screen using micro hole-mirror array (MHA) is proposed to improve the image visibility in projection-type integral imaging system. MHA which is a metal sheet with the array of holes whose wall surface is specular, can reduce the flipped image and resultingly increase the viewing angle of the system. The experimental results can verify the feasibility of the proposed...
Acquisition and visualization of three-dimensional information based on light field imaging technique is attractive due to its high compatibility. We introduce imaging techniques including real-time pickup-display systems and light field hologram generation.
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